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[Bug 1469579] Re: kernel crash when doing `rm -rf /root`

 

derek, the next step is to fully reverse commit bisect from kernel 3.19
to 4.1 in order to identify the last bad commit, followed immediately by
the first good one. Once this commit has been identified, then it may be
reviewed as a candidate for backporting into your release. Could you
please do this following
https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_reverse_bisect_the_upstream_kernel.3F
?

Please note, finding adjacent kernel versions is not fully commit
bisecting.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

** Tags added: kernel-fixed-upstream-4.1 needs-reverse-bisect

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1469579

Title:
  kernel crash when doing `rm -rf /root`

Status in linux package in Ubuntu:
  Incomplete

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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References