kernel-packages team mailing list archive

Thread
Date
[Bug 1566471] Missing required logs.

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Brad Figg <brad.figg@xxxxxxxxxxxxx>
Date: Tue, 05 Apr 2016 19:00:57 -0000
Reply-to: Bug 1566471 <1566471@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1566471

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1566471

Title:
  kernel oops: NULL pointer dereference in
  nfs_inode_attach_open_context+0x37/0x70 [nfs]

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I'm attempting to boot a Xenial server install (created from
  debootstrap) via NFS with overlayroot so that the initial rootfs is
  read-only (via NFS) and all modifications are written to a tmpfs so
  that I can boot many such machines. The kernel oops occurs during run-
  init after the initramfs has successfully mounted the NFS rootfs,
  created the tmpfs, and the overlayfs using both. If I do not use
  overlayfs, and just boot into the NFS root (read-write), then
  everything works. Note that the following oops was gathered from a
  qemu virtual machine that I netbooted, though the apport output was
  from real hardware. The issue occurs in both cases. Please let me know
  if I can provide more information.

  + exec run-init /root /sbin/init
  [    9.003288] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
  [    9.005772] IP: [<ffffffffc01d14d7>] nfs_inode_attach_open_context+0x37/0x70 [nfs]
  [    9.007227] PGD 0 
  [    9.007227] Oops: 0002 [#1] SMP 
  [    9.007227] Modules linked in: overlay nfsv3 nfs_acl nfs lockd grace sunrpc fscache raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd psmouse floppy pata_acpi
  [    9.007227] CPU: 0 PID: 1 Comm: init Not tainted 4.4.0-16-generic #32-Ubuntu
  [    9.007227] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
  [    9.007227] task: ffff88013ab80000 ti: ffff88013ab88000 task.ti: ffff88013ab88000
  [    9.007227] RIP: 0010:[<ffffffffc01d14d7>]  [<ffffffffc01d14d7>] nfs_inode_attach_open_context+0x37/0x70 [nfs]
  [    9.007227] RSP: 0018:ffff88013ab8bc30  EFLAGS: 00010246
  [    9.007227] RAX: ffff88007fa86d30 RBX: ffff8800bba16000 RCX: 0000000200000000
  [    9.007227] RDX: 0000000000000000 RSI: ffff88007fa86cc0 RDI: ffff8800bba16088
  [    9.007227] RBP: ffff88013ab8bc48 R08: ffff88007f09e09c R09: ffff88013b001800
  [    9.007227] R10: ffff88007fa86cc0 R11: 0000000000000000 R12: ffff88007fa86cc0
  [    9.007227] R13: ffff8800bba16088 R14: ffff8800bb9f7d88 R15: ffff88013a52f010
  [    9.007227] FS:  0000000000000000(0000) GS:ffff88013fc00000(0000) knlGS:0000000000000000
  [    9.007227] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [    9.007227] CR2: 0000000000000008 CR3: 000000013a530000 CR4: 00000000001406f0
  [    9.007227] Stack:
  [    9.007227]  ffff88007fa86cc0 ffff88013a52f000 ffff8800bb9f7d88 ffff88013ab8bc58
  [    9.007227]  ffffffffc01d153b ffff88013ab8bc80 ffffffffc01d3d37 ffff88013a52f000
  [    9.007227]  ffff8800bb9f7d88 0000000000000000 ffff88013ab8bca0 ffffffffc01d010d
  [    9.007227] Call Trace:
  [    9.007227]  [<ffffffffc01d153b>] nfs_file_set_open_context+0x2b/0x30 [nfs]
  [    9.007227]  [<ffffffffc01d3d37>] nfs_open+0x37/0x60 [nfs]
  [    9.007227]  [<ffffffffc01d010d>] nfs_file_open+0x4d/0x70 [nfs]
  [    9.007227]  [<ffffffff812098cf>] do_dentry_open+0x1ff/0x310
  [    9.007227]  [<ffffffffc01d00c0>] ? nfs_file_fsync+0x130/0x130 [nfs]
  [    9.007227]  [<ffffffff8120aa76>] vfs_open+0x56/0x60
  [    9.007227]  [<ffffffff8121a107>] path_openat+0x1b7/0x1360
  [    9.007227]  [<ffffffff8121c4a1>] do_filp_open+0x91/0x100
  [    9.007227]  [<ffffffff81229da8>] ? __alloc_fd+0xc8/0x190
  [    9.007227]  [<ffffffff8120ae3e>] do_sys_open+0x13e/0x2a0
  [    9.007227]  [<ffffffff810a112d>] ? __put_cred+0x3d/0x50
  [    9.007227]  [<ffffffff8120a1f8>] ? SyS_access+0x1e8/0x230
  [    9.007227]  [<ffffffff8120afbe>] SyS_open+0x1e/0x20
  [    9.007227]  [<ffffffff81824ef2>] entry_SYSCALL_64_fastpath+0x16/0x71
  [    9.007227] Code: 54 53 48 8b 47 40 49 89 fc 48 8b 58 30 4c 8d ab 88 00 00 00 4c 89 ef e8 98 37 65 c1 48 8b 93 60 ff ff ff 49 8d 44 24 70 4c 89 ef <48> 89 42 08 49 89 54 24 70 48 8d 93 60 ff ff ff 49 89 54 24 78 
  [    9.007227] RIP  [<ffffffffc01d14d7>] nfs_inode_attach_open_context+0x37/0x70 [nfs]
  [    9.007227]  RSP <ffff88013ab8bc30>
  [    9.007227] CR2: 0000000000000008
  [    9.056135] ---[ end trace 4bf38e0df912649a ]---
  [    9.057055] BUG: unable to handle kernel NULL pointer dereference at 0000000000000158
  [    9.058345] IP: [<ffffffffc01d1c70>] __put_nfs_open_context+0xa0/0x100 [nfs]
  [    9.059479] PGD 0 
  [    9.059823] Oops: 0000 [#2] SMP 
  [    9.060117] Modules linked in: overlay nfsv3 nfs_acl nfs lockd grace sunrpc fscache raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd psmouse floppy pata_acpi
  [    9.060117] CPU: 0 PID: 1 Comm: init Tainted: G      D         4.4.0-16-generic #32-Ubuntu
  [    9.060117] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
  [    9.060117] task: ffff88013ab80000 ti: ffff88013ab88000 task.ti: ffff88013ab88000
  [    9.060117] RIP: 0010:[<ffffffffc01d1c70>]  [<ffffffffc01d1c70>] __put_nfs_open_context+0xa0/0x100 [nfs]
  [    9.060117] RSP: 0018:ffff88013ab8b878  EFLAGS: 00010282
  [    9.060117] RAX: 0000000000000000 RBX: ffff880138e3e3c0 RCX: 0000000000000001
  [    9.060117] RDX: ffff88007fd3b358 RSI: 0000000000000001 RDI: ffff880138e3e3c0
  [    9.060117] RBP: ffff88013ab8b8a0 R08: 0000000000000000 R09: 0000000000000000
  [    9.060117] R10: ffff88007fd43598 R11: ffff8800bb71b610 R12: ffff88007fd3b3f8
  [    9.060117] R13: ffff88007fd3b480 R14: 0000000000000001 R15: ffff88007f09e000
  [    9.060117] FS:  0000000000000000(0000) GS:ffff88013fc00000(0000) knlGS:0000000000000000
  [    9.060117] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [    9.060117] CR2: 0000000000000158 CR3: 0000000001e0a000 CR4: 00000000001406f0
  [    9.060117] Stack:
  [    9.060117]  ffff880138e3e3c0 ffff88007fd3b358 ffff88007fd3b480 ffff880138426620
  [    9.060117]  ffff88007fd38600 ffff88013ab8b8c8 ffffffffc01d3cf3 ffff8800bb71b600
  [    9.060117]  ffff88007fd43598 ffff88007fd43598 ffff88013ab8b8e8 ffffffffc01cfa8b
  [    9.060117] Call Trace:
  [    9.060117]  [<ffffffffc01d3cf3>] nfs_file_clear_open_context+0x83/0x90 [nfs]
  [    9.060117]  [<ffffffffc01cfa8b>] nfs_file_release+0x3b/0x50 [nfs]
  [    9.060117]  [<ffffffff8120db84>] __fput+0xe4/0x220
  [    9.060117]  [<ffffffff8120dcfe>] ____fput+0xe/0x10
  [    9.060117]  [<ffffffff8109d9e8>] task_work_run+0x78/0xa0
  [    9.060117]  [<ffffffff81082b64>] do_exit+0x2e4/0xae0
  [    9.060117]  [<ffffffff8101abf1>] oops_end+0xa1/0xd0
  [    9.060117]  [<ffffffff81069db5>] no_context+0x135/0x380
  [    9.060117]  [<ffffffff8106a080>] __bad_area_nosemaphore+0x80/0x1f0
  [    9.060117]  [<ffffffff8106a253>] bad_area+0x43/0x50
  [    9.060117]  [<ffffffff8106a76b>] __do_page_fault+0x35b/0x400
  [    9.060117]  [<ffffffff8106a877>] trace_do_page_fault+0x37/0xe0
  [    9.060117]  [<ffffffff81062f29>] do_async_page_fault+0x19/0x70
  [    9.060117]  [<ffffffff818270a8>] async_page_fault+0x28/0x30
  [    9.060117]  [<ffffffffc01d14d7>] ? nfs_inode_attach_open_context+0x37/0x70 [nfs]
  [    9.060117]  [<ffffffffc01d153b>] nfs_file_set_open_context+0x2b/0x30 [nfs]
  [    9.060117]  [<ffffffffc01d3d37>] nfs_open+0x37/0x60 [nfs]
  [    9.060117]  [<ffffffffc01d010d>] nfs_file_open+0x4d/0x70 [nfs]
  [    9.060117]  [<ffffffff812098cf>] do_dentry_open+0x1ff/0x310
  [    9.060117]  [<ffffffffc01d00c0>] ? nfs_file_fsync+0x130/0x130 [nfs]
  [    9.060117]  [<ffffffff8120aa76>] vfs_open+0x56/0x60
  [    9.060117]  [<ffffffff8121a107>] path_openat+0x1b7/0x1360
  [    9.060117]  [<ffffffff8121c4a1>] do_filp_open+0x91/0x100
  [    9.060117]  [<ffffffff81229da8>] ? __alloc_fd+0xc8/0x190
  [    9.060117]  [<ffffffff8120ae3e>] do_sys_open+0x13e/0x2a0
  [    9.060117]  [<ffffffff810a112d>] ? __put_cred+0x3d/0x50
  [    9.060117]  [<ffffffff8120a1f8>] ? SyS_access+0x1e8/0x230
  [    9.060117]  [<ffffffff8120afbe>] SyS_open+0x1e/0x20
  [    9.060117]  [<ffffffff81824ef2>] entry_SYSCALL_64_fastpath+0x16/0x71
  [    9.060117] Code: 89 43 78 ff 14 25 08 bf e2 81 4d 85 e4 74 22 49 8b 44 24 28 44 89 f6 48 89 df 48 8b 80 58 04 00 00 48 8b 00 48 8b 80 e0 00 00 00 <ff> 90 58 01 00 00 48 8b 7b 48 48 85 ff 74 05 e8 bc e5 f7 ff 48 
  [    9.060117] RIP  [<ffffffffc01d1c70>] __put_nfs_open_context+0xa0/0x100 [nfs]
  [    9.060117]  RSP <ffff88013ab8b878>
  [    9.060117] CR2: 0000000000000158
  [    9.060117] ---[ end trace 4bf38e0df912649b ]---
  [    9.060117] Fixing recursive fault but reboot is needed!

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1566471/+subscriptions
References

[Bug 1566471] [NEW] kernel oops: NULL pointer dereference in nfs_inode_attach_open_context+0x37/0x70 [nfs]
From: Dan Schatzberg, 2016-04-05