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Message #125219
[Bug 1469579] [NEW] kernel crash when doing `rm -rf /root`
Public bug reported:
to make a persistent /root, I'd usually like to rm -rf /root and make it a symlink to somewhere on the harddrive, when I run with the Ubuntu Studio 15.10 (Wily Werewolf) Daily Build, it just crashed the kernel, this crash didn't happen of my last visit ubuntu14.10
http://cdimages.ubuntu.com/ubuntustudio/dvd/current/ (current is
28-Jun-2015 as the time now)
then I can reproduce this within VM, with Ubuntu 15.10 daily build
(current is 09-Jun-2015), from serial console I run strace \rm -rvf
/root and see kernel panic messages:
root@ubuntu-studio:~# cd /
root@ubuntu-studio:/# strace \rm -rvf /root && echo true
execve("/bin/rm", ["rm", "-rvf", "/root"], [/* 19 vars */]) = 0
brk(0) = 0x2090000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151e4000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=123268, ...}) = 0
mmap(NULL, 123268, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f91151c5000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\v\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1869392, ...}) = 0
mmap(NULL, 3972864, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f9114bf9000
mprotect(0x7f9114db9000, 2097152, PROT_NONE) = 0
mmap(0x7f9114fb9000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c0000) = 0x7f9114fb9000
mmap(0x7f9114fbf000, 16128, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f9114fbf000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151c4000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151c3000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151c2000
arch_prctl(ARCH_SET_FS, 0x7f91151c3700) = 0
mprotect(0x7f9114fb9000, 16384, PROT_READ) = 0
mprotect(0x60d000, 4096, PROT_READ) = 0
mprotect(0x7f91151e6000, 4096, PROT_READ) = 0
munmap(0x7f91151c5000, 123268) = 0
brk(0) = 0x2090000
brk(0x20b1000) = 0x20b1000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2919792, ...}) = 0
mmap(NULL, 2919792, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f9114930000
close(3) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B9600 opost isig icanon echo ...}) = 0
lstat("/", {st_mode=S_IFDIR|0755, st_size=260, ...}) = 0
newfstatat(AT_FDCWD, "/root", {st_mode=S_IFDIR|0700, st_size=60, ...}, AT_SYMLINK_NOFOLLOW) = 0
openat(AT_FDCWD, "/root", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW) = 3
fstat(3, {st_mode=S_IFDIR|0700, st_size=60, ...}) = 0
fcntl(3, F_GETFL) = 0x38800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW)
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
getdents(3, /* 5 entries */, 32768) = 144
close(3) = 0
openat(AT_FDCWD, "/root", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW) = 3
fcntl(3, F_GETFD) = 0
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
fstat(3, {st_mode=S_IFDIR|0700, st_size=60, ...}) = 0
fcntl(3, F_GETFL) = 0x38800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW)
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
fcntl(3, F_DUPFD, 3) = 4
fcntl(4, F_GETFD) = 0
fcntl(4, F_SETFD, FD_CLOEXEC) = 0
getdents(3, /* 5 entries */, 32768) = 144
getdents(3, /* 0 entries */, 32768) = 0
close(3) = 0
unlinkat(4, ".bashrc", 0) = 0
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2570, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151e3000
read(3, "# Locale name alias data base.\n#"..., 1024) = 1024
read(3, " entries are case independent.\n\n"..., 1024) = 1024
read(3, "R\nko_KR\t\tko_KR.eucKR\nlithuanian "..., 1024) = 522
read(3, "", 1024) = 0
close(3) = 0
munmap(0x7f91151e3000, 4096) = 0
open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=619, ...}) = 0
mmap(NULL, 619, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f91151e3000
close(3) = 0
open("/usr/lib/charset.alias", O_RDONLY|O_NOFOLLOW) = -1 ENOENT (No such file or directory)
fstat(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(4, 64), ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B9600 opost isig icanon echo ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151e2000
write(1, "removed \342\200\230/root/.bashrc\342\200\231\n", 28removed ‘/root/.bashrc’
) = 28
unlinkat(4, ".profile", 0) = 0
write(1, "removed \342\200\230/root/.profile\342\200\231\n", 29removed ‘/root/.profile’
) = 29
newfstatat(4, ".cache", {st_mode=S_IFDIR|0700, st_size=60, ...}, AT_SYMLINK_NOFOLLOW) = 0
openat(4, ".cache", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW) = 3
fstat(3, {st_mode=S_IFDIR|0700, st_size=60, ...}) = 0
fcntl(3, F_GETFL) = 0x38800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW)
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
getdents(3, /* 3 entries */, 32768) = 88
close(3) = 0
openat(4, ".cache", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW) = 3
fcntl(3, F_GETFD) = 0
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
fstat(3, {st_mode=S_IFDIR|0700, st_size=60, ...}) = 0
fcntl(3, F_GETFL) = 0x38800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW)
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
fcntl(3, F_DUPFD, 3) = 5
fcntl(5, F_GETFD) = 0
fcntl(5, F_SETFD, FD_CLOEXEC) = 0
getdents(3, /* 3 entries */, 32768) = 88
getdents(3, /* 0 entries */, 32768) = 0
close(3) = 0
unlinkat(5, "motd.legal-displayed", 0) = 0
write(1, "removed \342\200\230/root/.cache/motd.leg"..., 48removed ‘/root/.cache/motd.legal-displayed’
) = 48
close(5) = 0
unlinkat(4, ".cache", AT_REMOVEDIR) = 0
write(1, "removed directory: \342\200\230/root/.cac"..., 38removed directory: ‘/root/.cache’
) = 38
close(4) = 0
unlinkat(AT_FDCWD, "/root", AT_REMOVEDIR[ 77.975408] BUG: unable to handle kernel NULL pointer dereference at 0000000000000016
[ 77.976006] IP: [<ffffffff81219ba0>] __detach_mounts+0x40/0x90
[ 77.976006] PGD 127fa067 PUD 112cd067 PMD 0
[ 77.976006] Oops: 0000 [#1] PREEMPT SMP
[ 77.976006] Modules linked in: kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd dm_multipath scsi_dh serio_raw i2c_piix4 cfg80211 8250_fintek mac_hid cuse parport_pc ppdev lp parport autofs4 squashfs overlay nls_utf8 isofs dm_mirror dm_region_hash dm_log psmouse e1000 pata_acpi floppy
[ 77.976006] CPU: 0 PID: 2308 Comm: rm Not tainted 3.19.0-22-lowlatency #22-Ubuntu
[ 77.976006] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.8.1-20150604_211837-tipua 04/01/2014
[ 77.976006] task: ffff880006db09f0 ti: ffff880011310000 task.ti: ffff880011310000
[ 77.976006] RIP: 0010:[<ffffffff81219ba0>] [<ffffffff81219ba0>] __detach_mounts+0x40/0x90
[ 77.976006] RSP: 0018:ffff880011313e38 EFLAGS: 00010206
[ 77.976006] RAX: 0000000026842684 RBX: fffffffffffffffe RCX: 000000000000000c
[ 77.976006] RDX: 0000000000002684 RSI: ffffffffffffffff RDI: ffffffff81c0c4c4
[ 77.976006] RBP: ffff880011313e48 R08: 0000000000000000 R09: 0000000000000246
[ 77.976006] R10: ffffffff81198297 R11: ffff8800051d4c00 R12: ffff88003305f718
[ 77.976006] R13: ffff880053323cd8 R14: 00000000ffffff9c R15: 0000000000000000
[ 77.976006] FS: 00007f91151c3700(0000) GS:ffff880055e00000(0000) knlGS:0000000000000000
[ 77.976006] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 77.976006] CR2: 0000000000000016 CR3: 000000001240f000 CR4: 00000000001407f0
[ 77.976006] Stack:
[ 77.976006] ffff880011313e48 ffff88003305f6c0 ffff880011313e78 ffffffff81202a7f
[ 77.976006] ffff880011313e68 ffff88001f427000 0000000000000000 00000000020910c0
[ 77.976006] ffff880011313f68 ffffffff812083f3 ffff88003305f6c0 ffff880011313ea8
[ 77.976006] Call Trace:
[ 77.976006] [<ffffffff81202a7f>] vfs_rmdir+0x12f/0x140
[ 77.976006] [<ffffffff812083f3>] do_rmdir+0x203/0x220
[ 77.976006] [<ffffffff810257f7>] ? syscall_trace_enter_phase2+0x107/0x240
[ 77.976006] [<ffffffff81025a23>] ? syscall_trace_leave+0x83/0x170
[ 77.976006] [<ffffffff812097f5>] SyS_unlinkat+0x25/0x40
[ 77.976006] [<ffffffff817cf984>] tracesys_phase2+0xd8/0xdd
[ 77.976006] Code: 83 ec 08 e8 93 3b 5b 00 48 89 df e8 eb d2 ff ff 48 85 c0 48 89 c3 74 55 48 c7 c7 c4 c4 c0 81 e8 77 58 5b 00 83 05 20 29 9f 00 01 <48> 8b 53 18 48 85 d2 74 1e 0f 1f 80 00 00 00 00 48 8d ba 10 ff
[ 77.976006] RIP [<ffffffff81219ba0>] __detach_mounts+0x40/0x90
[ 77.976006] RSP <ffff880011313e38>
[ 77.976006] CR2: 0000000000000016
[ 77.976006] ---[ end trace ba33e07ed00b256d ]---
[ 77.976006] note: rm[2308] exited with preempt_count 1
telnet> send brk # here I tried to send a break for
SysRq, but the kernel is not responding at the moment,
[ 104.042006] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [rm:2308]
[ 104.042006] Modules linked in: kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd dm_multipath scsi_dh serio_raw i2c_piix4 cfg80211 8250_fintek mac_hid cuse parport_pc ppdev lp parport autofs4 squashfs overlay nls_utf8 isofs dm_mirror dm_region_hash dm_log psmouse e1000 pata_acpi floppy
[ 104.042006] CPU: 0 PID: 2308 Comm: rm Tainted: G D 3.19.0-22-lowlatency #22-Ubuntu
[ 104.042006] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.8.1-20150604_211837-tipua 04/01/2014
[ 104.042006] task: ffff880006db09f0 ti: ffff880011310000 task.ti: ffff880011310000
[ 104.042006] RIP: 0010:[<ffffffff8105d156>] [<ffffffff8105d156>] native_safe_halt+0x6/0x10
[ 104.042006] RSP: 0018:ffff880011313910 EFLAGS: 00000206
[ 104.042006] RAX: 0000000000002685 RBX: 0100000000000000 RCX: 0000000000075898
[ 104.042006] RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff8800560ed000
[ 104.042006] RBP: ffff880011313910 R08: 0000000000000004 R09: 0000000000000246
[ 104.042006] R10: ffffffff8119f621 R11: 0000000000000000 R12: ffff8800560f1780
[ 104.042006] R13: ffffea000044b3c0 R14: ffffffff811d7255 R15: ffff880011313918
[ 104.042006] FS: 0000000000000000(0000) GS:ffff880055e00000(0000) knlGS:0000000000000000
[ 104.042006] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 104.042006] CR2: 0000000000000016 CR3: 0000000001c13000 CR4: 00000000001407f0
[ 104.042006] Stack:
[ 104.042006] ffff880011313960 ffffffff8105cb8c ffffffff811d76d6 00002686113139b8
[ 104.042006] ffff8800051d0a80 ffff88004f5c7280 0000000040000010 ffff8800127c6a98
[ 104.042006] ffff8800051a5a80 ffff88004f5c72a0 ffff8800113139b8 ffffffff8105be51
[ 104.042006] Call Trace:
[ 104.042006] [<ffffffff8105cb8c>] kvm_lock_spinning+0xbc/0x220
[ 104.042006] [<ffffffff811d76d6>] ? kmem_cache_free+0x206/0x240
[ 104.042006] [<ffffffff8105be51>] __raw_callee_save_kvm_lock_spinning+0x11/0x20
[ 104.042006] [<ffffffff8119f621>] ? kzfree+0x31/0x40
[ 104.042006] [<ffffffff817cf48b>] ? _raw_spin_lock+0x7b/0x80
[ 104.042006] [<ffffffff81218694>] mntput_no_expire+0x44/0x160
[ 104.042006] [<ffffffff812187d4>] mntput+0x24/0x40
[ 104.042006] [<ffffffff811f8a72>] __fput+0x182/0x240
[ 104.042006] [<ffffffff811f8b7e>] ____fput+0xe/0x10
[ 104.042006] [<ffffffff81094317>] task_work_run+0xb7/0xf0
[ 104.042006] [<ffffffff81079c5d>] do_exit+0x35d/0xa70
[ 104.042006] [<ffffffff810ce625>] ? kmsg_dump+0xc5/0xd0
[ 104.042006] [<ffffffff81019ba8>] oops_end+0xa8/0x120
[ 104.042006] [<ffffffff81063b2d>] no_context+0x11d/0x390
[ 104.042006] [<ffffffff81211149>] ? __d_alloc+0x29/0x190
[ 104.042006] [<ffffffff8108022d>] ? ns_capable+0x2d/0x60
[ 104.042006] [<ffffffff81063e1d>] __bad_area_nosemaphore+0x7d/0x210
[ 104.042006] [<ffffffff81211149>] ? __d_alloc+0x29/0x190
[ 104.042006] [<ffffffff81063fc3>] bad_area_nosemaphore+0x13/0x20
[ 104.042006] [<ffffffff810642be>] __do_page_fault+0xbe/0x5e0
[ 104.042006] [<ffffffff810da87d>] ? call_rcu+0x1d/0x20
[ 104.042006] [<ffffffff811940e1>] ? shmem_destroy_inode+0x31/0x50
[ 104.042006] [<ffffffff81064895>] trace_do_page_fault+0x45/0x140
[ 104.042006] [<ffffffff8105c4de>] do_async_page_fault+0x1e/0xd0
[ 104.042006] [<ffffffff817d1948>] async_page_fault+0x28/0x30
[ 104.042006] [<ffffffff81198297>] ? shmem_evict_inode+0x57/0x140
[ 104.042006] [<ffffffff81219ba0>] ? __detach_mounts+0x40/0x90
[ 104.042006] [<ffffffff81219b99>] ? __detach_mounts+0x39/0x90
[ 104.042006] [<ffffffff81202a7f>] vfs_rmdir+0x12f/0x140
[ 104.042006] [<ffffffff812083f3>] do_rmdir+0x203/0x220
[ 104.042006] [<ffffffff810257f7>] ? syscall_trace_enter_phase2+0x107/0x240
[ 104.042006] [<ffffffff81025a23>] ? syscall_trace_leave+0x83/0x170
[ 104.042006] [<ffffffff812097f5>] SyS_unlinkat+0x25/0x40
[ 104.042006] [<ffffffff817cf984>] tracesys_phase2+0xd8/0xdd
[ 104.042006] Code: 00 00 00 00 00 55 48 89 e5 fa 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 66 0f 1f 84
QEMU 2.3.0 monitor - type 'help' for more information
(qemu) quit
Connection closed by foreign host.
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-3.19.0-22-lowlatency 3.19.0-22.22
ProcVersionSignature: Ubuntu 3.19.0-22.22-lowlatency 3.19.8-ckt1
Uname: Linux 3.19.0-22-lowlatency x86_64
NonfreeKernelModules: wl
ApportVersion: 2.17.3-0ubuntu4
Architecture: amd64
CasperVersion: 1.361
CurrentDesktop: XFCE
Date: Sun Jun 28 18:38:29 2015
LiveMediaBuild: Ubuntu-Studio 15.10 "Wily Werewolf" - Alpha amd64 (20150623)
MachineType: Apple Inc. MacBookPro11,2
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/studio/casper/vmlinuz file=/cdrom/preseed/ubuntustudio.seed boot=casper iso-scan/filename=/studio/wily-dvd-amd64.iso quiet splash username=username acpi_osi=Linux acpi=force acpi_enforce_resources=lax i915.enable_rc6=1 i915.enable_fbc=1 i915.lvds_downclock=1 i915.semaphores=1 pcie_aspm=force crashkernel=auto ---
RelatedPackageVersions:
linux-restricted-modules-3.19.0-22-lowlatency N/A
linux-backports-modules-3.19.0-22-lowlatency N/A
linux-firmware 1.144
SourcePackage: linux
StagingDrivers: r8188eu
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/07/2015
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP112.88Z.0138.B14.1501071031
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-3CBD00234E554E41
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro11,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-3CBD00234E554E41
dmi.modalias: dmi:bvnAppleInc.:bvrMBP112.88Z.0138.B14.1501071031:bd01/07/2015:svnAppleInc.:pnMacBookPro11,2:pvr1.0:rvnAppleInc.:rnMac-3CBD00234E554E41:rvrMacBookPro11,2:cvnAppleInc.:ct10:cvrMac-3CBD00234E554E41:
dmi.product.name: MacBookPro11,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug staging wily
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https://bugs.launchpad.net/bugs/1469579
Title:
kernel crash when doing `rm -rf /root`
Status in linux package in Ubuntu:
New
Bug description:
to make a persistent /root, I'd usually like to rm -rf /root and make it a symlink to somewhere on the harddrive, when I run with the Ubuntu Studio 15.10 (Wily Werewolf) Daily Build, it just crashed the kernel, this crash didn't happen of my last visit ubuntu14.10
http://cdimages.ubuntu.com/ubuntustudio/dvd/current/ (current is
28-Jun-2015 as the time now)
then I can reproduce this within VM, with Ubuntu 15.10 daily build
(current is 09-Jun-2015), from serial console I run strace \rm -rvf
/root and see kernel panic messages:
root@ubuntu-studio:~# cd /
root@ubuntu-studio:/# strace \rm -rvf /root && echo true
execve("/bin/rm", ["rm", "-rvf", "/root"], [/* 19 vars */]) = 0
brk(0) = 0x2090000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151e4000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=123268, ...}) = 0
mmap(NULL, 123268, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f91151c5000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\v\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1869392, ...}) = 0
mmap(NULL, 3972864, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f9114bf9000
mprotect(0x7f9114db9000, 2097152, PROT_NONE) = 0
mmap(0x7f9114fb9000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c0000) = 0x7f9114fb9000
mmap(0x7f9114fbf000, 16128, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f9114fbf000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151c4000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151c3000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151c2000
arch_prctl(ARCH_SET_FS, 0x7f91151c3700) = 0
mprotect(0x7f9114fb9000, 16384, PROT_READ) = 0
mprotect(0x60d000, 4096, PROT_READ) = 0
mprotect(0x7f91151e6000, 4096, PROT_READ) = 0
munmap(0x7f91151c5000, 123268) = 0
brk(0) = 0x2090000
brk(0x20b1000) = 0x20b1000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2919792, ...}) = 0
mmap(NULL, 2919792, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f9114930000
close(3) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B9600 opost isig icanon echo ...}) = 0
lstat("/", {st_mode=S_IFDIR|0755, st_size=260, ...}) = 0
newfstatat(AT_FDCWD, "/root", {st_mode=S_IFDIR|0700, st_size=60, ...}, AT_SYMLINK_NOFOLLOW) = 0
openat(AT_FDCWD, "/root", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW) = 3
fstat(3, {st_mode=S_IFDIR|0700, st_size=60, ...}) = 0
fcntl(3, F_GETFL) = 0x38800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW)
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
getdents(3, /* 5 entries */, 32768) = 144
close(3) = 0
openat(AT_FDCWD, "/root", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW) = 3
fcntl(3, F_GETFD) = 0
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
fstat(3, {st_mode=S_IFDIR|0700, st_size=60, ...}) = 0
fcntl(3, F_GETFL) = 0x38800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW)
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
fcntl(3, F_DUPFD, 3) = 4
fcntl(4, F_GETFD) = 0
fcntl(4, F_SETFD, FD_CLOEXEC) = 0
getdents(3, /* 5 entries */, 32768) = 144
getdents(3, /* 0 entries */, 32768) = 0
close(3) = 0
unlinkat(4, ".bashrc", 0) = 0
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2570, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151e3000
read(3, "# Locale name alias data base.\n#"..., 1024) = 1024
read(3, " entries are case independent.\n\n"..., 1024) = 1024
read(3, "R\nko_KR\t\tko_KR.eucKR\nlithuanian "..., 1024) = 522
read(3, "", 1024) = 0
close(3) = 0
munmap(0x7f91151e3000, 4096) = 0
open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=619, ...}) = 0
mmap(NULL, 619, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f91151e3000
close(3) = 0
open("/usr/lib/charset.alias", O_RDONLY|O_NOFOLLOW) = -1 ENOENT (No such file or directory)
fstat(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(4, 64), ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B9600 opost isig icanon echo ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151e2000
write(1, "removed \342\200\230/root/.bashrc\342\200\231\n", 28removed ‘/root/.bashrc’
) = 28
unlinkat(4, ".profile", 0) = 0
write(1, "removed \342\200\230/root/.profile\342\200\231\n", 29removed ‘/root/.profile’
) = 29
newfstatat(4, ".cache", {st_mode=S_IFDIR|0700, st_size=60, ...}, AT_SYMLINK_NOFOLLOW) = 0
openat(4, ".cache", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW) = 3
fstat(3, {st_mode=S_IFDIR|0700, st_size=60, ...}) = 0
fcntl(3, F_GETFL) = 0x38800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW)
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
getdents(3, /* 3 entries */, 32768) = 88
close(3) = 0
openat(4, ".cache", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW) = 3
fcntl(3, F_GETFD) = 0
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
fstat(3, {st_mode=S_IFDIR|0700, st_size=60, ...}) = 0
fcntl(3, F_GETFL) = 0x38800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW)
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
fcntl(3, F_DUPFD, 3) = 5
fcntl(5, F_GETFD) = 0
fcntl(5, F_SETFD, FD_CLOEXEC) = 0
getdents(3, /* 3 entries */, 32768) = 88
getdents(3, /* 0 entries */, 32768) = 0
close(3) = 0
unlinkat(5, "motd.legal-displayed", 0) = 0
write(1, "removed \342\200\230/root/.cache/motd.leg"..., 48removed ‘/root/.cache/motd.legal-displayed’
) = 48
close(5) = 0
unlinkat(4, ".cache", AT_REMOVEDIR) = 0
write(1, "removed directory: \342\200\230/root/.cac"..., 38removed directory: ‘/root/.cache’
) = 38
close(4) = 0
unlinkat(AT_FDCWD, "/root", AT_REMOVEDIR[ 77.975408] BUG: unable to handle kernel NULL pointer dereference at 0000000000000016
[ 77.976006] IP: [<ffffffff81219ba0>] __detach_mounts+0x40/0x90
[ 77.976006] PGD 127fa067 PUD 112cd067 PMD 0
[ 77.976006] Oops: 0000 [#1] PREEMPT SMP
[ 77.976006] Modules linked in: kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd dm_multipath scsi_dh serio_raw i2c_piix4 cfg80211 8250_fintek mac_hid cuse parport_pc ppdev lp parport autofs4 squashfs overlay nls_utf8 isofs dm_mirror dm_region_hash dm_log psmouse e1000 pata_acpi floppy
[ 77.976006] CPU: 0 PID: 2308 Comm: rm Not tainted 3.19.0-22-lowlatency #22-Ubuntu
[ 77.976006] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.8.1-20150604_211837-tipua 04/01/2014
[ 77.976006] task: ffff880006db09f0 ti: ffff880011310000 task.ti: ffff880011310000
[ 77.976006] RIP: 0010:[<ffffffff81219ba0>] [<ffffffff81219ba0>] __detach_mounts+0x40/0x90
[ 77.976006] RSP: 0018:ffff880011313e38 EFLAGS: 00010206
[ 77.976006] RAX: 0000000026842684 RBX: fffffffffffffffe RCX: 000000000000000c
[ 77.976006] RDX: 0000000000002684 RSI: ffffffffffffffff RDI: ffffffff81c0c4c4
[ 77.976006] RBP: ffff880011313e48 R08: 0000000000000000 R09: 0000000000000246
[ 77.976006] R10: ffffffff81198297 R11: ffff8800051d4c00 R12: ffff88003305f718
[ 77.976006] R13: ffff880053323cd8 R14: 00000000ffffff9c R15: 0000000000000000
[ 77.976006] FS: 00007f91151c3700(0000) GS:ffff880055e00000(0000) knlGS:0000000000000000
[ 77.976006] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 77.976006] CR2: 0000000000000016 CR3: 000000001240f000 CR4: 00000000001407f0
[ 77.976006] Stack:
[ 77.976006] ffff880011313e48 ffff88003305f6c0 ffff880011313e78 ffffffff81202a7f
[ 77.976006] ffff880011313e68 ffff88001f427000 0000000000000000 00000000020910c0
[ 77.976006] ffff880011313f68 ffffffff812083f3 ffff88003305f6c0 ffff880011313ea8
[ 77.976006] Call Trace:
[ 77.976006] [<ffffffff81202a7f>] vfs_rmdir+0x12f/0x140
[ 77.976006] [<ffffffff812083f3>] do_rmdir+0x203/0x220
[ 77.976006] [<ffffffff810257f7>] ? syscall_trace_enter_phase2+0x107/0x240
[ 77.976006] [<ffffffff81025a23>] ? syscall_trace_leave+0x83/0x170
[ 77.976006] [<ffffffff812097f5>] SyS_unlinkat+0x25/0x40
[ 77.976006] [<ffffffff817cf984>] tracesys_phase2+0xd8/0xdd
[ 77.976006] Code: 83 ec 08 e8 93 3b 5b 00 48 89 df e8 eb d2 ff ff 48 85 c0 48 89 c3 74 55 48 c7 c7 c4 c4 c0 81 e8 77 58 5b 00 83 05 20 29 9f 00 01 <48> 8b 53 18 48 85 d2 74 1e 0f 1f 80 00 00 00 00 48 8d ba 10 ff
[ 77.976006] RIP [<ffffffff81219ba0>] __detach_mounts+0x40/0x90
[ 77.976006] RSP <ffff880011313e38>
[ 77.976006] CR2: 0000000000000016
[ 77.976006] ---[ end trace ba33e07ed00b256d ]---
[ 77.976006] note: rm[2308] exited with preempt_count 1
telnet> send brk # here I tried to send a break for
SysRq, but the kernel is not responding at the moment,
[ 104.042006] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [rm:2308]
[ 104.042006] Modules linked in: kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd dm_multipath scsi_dh serio_raw i2c_piix4 cfg80211 8250_fintek mac_hid cuse parport_pc ppdev lp parport autofs4 squashfs overlay nls_utf8 isofs dm_mirror dm_region_hash dm_log psmouse e1000 pata_acpi floppy
[ 104.042006] CPU: 0 PID: 2308 Comm: rm Tainted: G D 3.19.0-22-lowlatency #22-Ubuntu
[ 104.042006] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.8.1-20150604_211837-tipua 04/01/2014
[ 104.042006] task: ffff880006db09f0 ti: ffff880011310000 task.ti: ffff880011310000
[ 104.042006] RIP: 0010:[<ffffffff8105d156>] [<ffffffff8105d156>] native_safe_halt+0x6/0x10
[ 104.042006] RSP: 0018:ffff880011313910 EFLAGS: 00000206
[ 104.042006] RAX: 0000000000002685 RBX: 0100000000000000 RCX: 0000000000075898
[ 104.042006] RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff8800560ed000
[ 104.042006] RBP: ffff880011313910 R08: 0000000000000004 R09: 0000000000000246
[ 104.042006] R10: ffffffff8119f621 R11: 0000000000000000 R12: ffff8800560f1780
[ 104.042006] R13: ffffea000044b3c0 R14: ffffffff811d7255 R15: ffff880011313918
[ 104.042006] FS: 0000000000000000(0000) GS:ffff880055e00000(0000) knlGS:0000000000000000
[ 104.042006] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 104.042006] CR2: 0000000000000016 CR3: 0000000001c13000 CR4: 00000000001407f0
[ 104.042006] Stack:
[ 104.042006] ffff880011313960 ffffffff8105cb8c ffffffff811d76d6 00002686113139b8
[ 104.042006] ffff8800051d0a80 ffff88004f5c7280 0000000040000010 ffff8800127c6a98
[ 104.042006] ffff8800051a5a80 ffff88004f5c72a0 ffff8800113139b8 ffffffff8105be51
[ 104.042006] Call Trace:
[ 104.042006] [<ffffffff8105cb8c>] kvm_lock_spinning+0xbc/0x220
[ 104.042006] [<ffffffff811d76d6>] ? kmem_cache_free+0x206/0x240
[ 104.042006] [<ffffffff8105be51>] __raw_callee_save_kvm_lock_spinning+0x11/0x20
[ 104.042006] [<ffffffff8119f621>] ? kzfree+0x31/0x40
[ 104.042006] [<ffffffff817cf48b>] ? _raw_spin_lock+0x7b/0x80
[ 104.042006] [<ffffffff81218694>] mntput_no_expire+0x44/0x160
[ 104.042006] [<ffffffff812187d4>] mntput+0x24/0x40
[ 104.042006] [<ffffffff811f8a72>] __fput+0x182/0x240
[ 104.042006] [<ffffffff811f8b7e>] ____fput+0xe/0x10
[ 104.042006] [<ffffffff81094317>] task_work_run+0xb7/0xf0
[ 104.042006] [<ffffffff81079c5d>] do_exit+0x35d/0xa70
[ 104.042006] [<ffffffff810ce625>] ? kmsg_dump+0xc5/0xd0
[ 104.042006] [<ffffffff81019ba8>] oops_end+0xa8/0x120
[ 104.042006] [<ffffffff81063b2d>] no_context+0x11d/0x390
[ 104.042006] [<ffffffff81211149>] ? __d_alloc+0x29/0x190
[ 104.042006] [<ffffffff8108022d>] ? ns_capable+0x2d/0x60
[ 104.042006] [<ffffffff81063e1d>] __bad_area_nosemaphore+0x7d/0x210
[ 104.042006] [<ffffffff81211149>] ? __d_alloc+0x29/0x190
[ 104.042006] [<ffffffff81063fc3>] bad_area_nosemaphore+0x13/0x20
[ 104.042006] [<ffffffff810642be>] __do_page_fault+0xbe/0x5e0
[ 104.042006] [<ffffffff810da87d>] ? call_rcu+0x1d/0x20
[ 104.042006] [<ffffffff811940e1>] ? shmem_destroy_inode+0x31/0x50
[ 104.042006] [<ffffffff81064895>] trace_do_page_fault+0x45/0x140
[ 104.042006] [<ffffffff8105c4de>] do_async_page_fault+0x1e/0xd0
[ 104.042006] [<ffffffff817d1948>] async_page_fault+0x28/0x30
[ 104.042006] [<ffffffff81198297>] ? shmem_evict_inode+0x57/0x140
[ 104.042006] [<ffffffff81219ba0>] ? __detach_mounts+0x40/0x90
[ 104.042006] [<ffffffff81219b99>] ? __detach_mounts+0x39/0x90
[ 104.042006] [<ffffffff81202a7f>] vfs_rmdir+0x12f/0x140
[ 104.042006] [<ffffffff812083f3>] do_rmdir+0x203/0x220
[ 104.042006] [<ffffffff810257f7>] ? syscall_trace_enter_phase2+0x107/0x240
[ 104.042006] [<ffffffff81025a23>] ? syscall_trace_leave+0x83/0x170
[ 104.042006] [<ffffffff812097f5>] SyS_unlinkat+0x25/0x40
[ 104.042006] [<ffffffff817cf984>] tracesys_phase2+0xd8/0xdd
[ 104.042006] Code: 00 00 00 00 00 55 48 89 e5 fa 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 66 0f 1f 84
QEMU 2.3.0 monitor - type 'help' for more information
(qemu) quit
Connection closed by foreign host.
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-3.19.0-22-lowlatency 3.19.0-22.22
ProcVersionSignature: Ubuntu 3.19.0-22.22-lowlatency 3.19.8-ckt1
Uname: Linux 3.19.0-22-lowlatency x86_64
NonfreeKernelModules: wl
ApportVersion: 2.17.3-0ubuntu4
Architecture: amd64
CasperVersion: 1.361
CurrentDesktop: XFCE
Date: Sun Jun 28 18:38:29 2015
LiveMediaBuild: Ubuntu-Studio 15.10 "Wily Werewolf" - Alpha amd64 (20150623)
MachineType: Apple Inc. MacBookPro11,2
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/studio/casper/vmlinuz file=/cdrom/preseed/ubuntustudio.seed boot=casper iso-scan/filename=/studio/wily-dvd-amd64.iso quiet splash username=username acpi_osi=Linux acpi=force acpi_enforce_resources=lax i915.enable_rc6=1 i915.enable_fbc=1 i915.lvds_downclock=1 i915.semaphores=1 pcie_aspm=force crashkernel=auto ---
RelatedPackageVersions:
linux-restricted-modules-3.19.0-22-lowlatency N/A
linux-backports-modules-3.19.0-22-lowlatency N/A
linux-firmware 1.144
SourcePackage: linux
StagingDrivers: r8188eu
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/07/2015
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP112.88Z.0138.B14.1501071031
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-3CBD00234E554E41
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro11,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-3CBD00234E554E41
dmi.modalias: dmi:bvnAppleInc.:bvrMBP112.88Z.0138.B14.1501071031:bd01/07/2015:svnAppleInc.:pnMacBookPro11,2:pvr1.0:rvnAppleInc.:rnMac-3CBD00234E554E41:rvrMacBookPro11,2:cvnAppleInc.:ct10:cvrMac-3CBD00234E554E41:
dmi.product.name: MacBookPro11,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
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Follow ups
References
