I just got this issue on one of my test servers:
[784650.537576] general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC
[784650.540018] Modules linked in: fhgfs(O) fhgfs_client_opentk(O) nfsd xfs ext4 mbcache jbd2 crc16 mlx4_ib mlx4_core ib_umad rdma_ucm rdma_cm iw_cm ib_addr ib_uverbs sg ib_ipoib ib_cm ib_sa loop arcmsr dm_mod md_mod evdev snd_pcm snd_timer snd soundcore tpm_tis snd_page_alloc tpm psmouse tpm_bios pcspkr shpchp serio_raw pci_hotplug ib_mthca ib_mad parport_pc parport amd64_edac_mod ib_core i2c_nforce2 processor k8temp edac_core thermal_sys edac_mce_amd button i2c_core ehci_pci fuse sd_mod crc_t10dif btrfs zlib_deflate crc32c libcrc32c ata_generic e1000 pata_amd sata_nv ohci_hcd floppy ehci_hcd libata scsi_mod usbcore usb_common
[784650.540018] CPU 1
[784650.540018] Pid: 247, comm: kworker/1:1H Tainted: G O 3.8.7 #34 Supermicro H8DCE/H8DCE
[784650.540018] RIP: 0010:[<ffffffffa05b38ba>] [<ffffffffa05b38ba>] xfs_trans_ail_delete_bulk+0x7a/0x1d0 [xfs]
[784650.540018] RSP: 0018:ffff8801f29ddbf8 EFLAGS: 00010202
[784650.540018] RAX: 0000000000000001 RBX: ffff8801f319bf00 RCX: 0000000000000000
[784650.540018] RDX: ffff8801f29ddc68 RSI: 6b6b6b6b6b6b6b6b RDI: 6b6b6b6b6b6b6b6b
[784650.540018] RBP: ffff8801f29ddc48 R08: 0000000000000001 R09: 0000000000000000
[784650.540018] R10: 0000000000000001 R11: ffffffffa05ccb35 R12: 0000000000000002
[784650.540018] R13: 0000000000000008 R14: ffff8801f319bf10 R15: ffff8801f7951550
[784650.540018] FS: 00007f10717f4700(0000) GS:ffff8801ff600000(0000) knlGS:0000000000000000
[784650.540018] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[784650.540018] CR2: 00007fe7eed59000 CR3: 00000000ae5e4000 CR4: 00000000000007e0
[784650.540018] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[784650.540018] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[784650.540018] Process kworker/1:1H (pid: 247, threadinfo ffff8801f29dc000, task ffff8801f2f14980)
[784650.540018] Stack:
[784650.540018] ffff880100000000 ffff880100000000 ffff8801f29ddc60 ffff88005ff27838
[784650.540018] ffff8801f29ddc48 ffff88014c4c0b20 ffff8801f319bf00 ffff8801f29ddc78
[784650.540018] ffff8801f29ddc60 ffff8801f29ddd58 ffff8801f29ddca8 ffffffffa05b3320
[784650.540018] Call Trace:
[784650.540018] [<ffffffffa05b3320>] xfs_iflush_done+0x1c0/0x1f0 [xfs]
[784650.540018] [<ffffffffa05b3174>] ? xfs_iflush_done+0x14/0x1f0 [xfs]
[784650.540018] [<ffffffffa05b0d8c>] xfs_buf_do_callbacks+0x3c/0x50 [xfs]
[784650.540018] [<ffffffffa05b145e>] xfs_buf_iodone_callbacks+0x3e/0x250 [xfs]
[784650.540018] [<ffffffffa0554309>] xfs_buf_iodone_work+0x59/0xa0 [xfs]
[784650.540018] [<ffffffff8107b744>] process_one_work+0x204/0x550
[784650.540018] [<ffffffff8107b6d0>] ? process_one_work+0x190/0x550
[784650.540018] [<ffffffff8107ddeb>] worker_thread+0x12b/0x3d0
[784650.540018] [<ffffffff8107dcc0>] ? manage_workers+0x2f0/0x2f0
[784650.540018] [<ffffffff810836ce>] kthread+0xee/0x100
[784650.540018] [<ffffffff810835e0>] ? __init_kthread_worker+0x70/0x70
[784650.540018] [<ffffffff8158dabc>] ret_from_fork+0x7c/0xb0
[784650.540018] [<ffffffff810835e0>] ? __init_kthread_worker+0x70/0x70
[784650.540018] Code: 00 00 48 89 f2 31 c0 31 c9 eb 19 66 0f 1f 44 00 00 4c 8b 7a 08 48 83 c2 08 41 f6 47 34 01 0f 84 ad 00 00 00 49 8b 3f 49 8b 77 08 <48> 89 77 08 48 89 3e 48 bf 00 01 10 00 00 00 ad de 48 be 00 02
[784650.540018] RIP [<ffffffffa05b38ba>] xfs_trans_ail_delete_bulk+0x7a/0x1d0 [xfs]
[784650.540018] RSP <ffff8801f29ddbf8>
[784650.849642] ---[ end trace 38cae66ea9b6d0f5 ]---
[784650.854439] BUG: sleeping function called from invalid context at kernel/rwsem.c:20
[784650.862280] in_atomic(): 1, irqs_disabled(): 0, pid: 247, name: kworker/1:1H
[... further messages and tracing causing a panic skipped]
I can resolve line numbers if required, but I don't have any minute to
look into it myself.
Cheers,
Bernd
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