Discovered this message in my kernel logs today, running 4.9.44 kernel
with a kernel cephfs mount:
[Wed Aug 30 14:17:04 2017] kernel BUG at
/home/kernel/COD/linux/net/ceph/osd_client.c:1554!
[Wed Aug 30 14:17:04 2017] invalid opcode: 0000 [#1] SMP
[Wed Aug 30 14:17:04 2017] Modules linked in: binfmt_misc ipmi_devintf
ceph libceph libcrc32c fscache ipmi_ssif intel_powerclamp coretemp
kvm_intel kvm gpio_ich input_leds ipmi_si serio_raw irqbypass
intel_cstate shpchp i7core_edac hpilo lpc_ich edac_core
acpi_power_meter ipmi_msghandler mac_hid 8021q garp mrp stp llc
bonding nfsd auth_rpcgss nfs_acl lp lockd grace parport sunrpc autofs4
btrfs xor raid6_pq mlx4_en ptp pps_core hid_generic i2c_algo_bit ttm
drm_kms_helper usbhid syscopyarea sysfillrect sysimgblt fb_sys_fops
hid mlx4_core hpsa psmouse drm pata_acpi bnx2 devlink
scsi_transport_sas fjes
[Wed Aug 30 14:17:04 2017] CPU: 18 PID: 471071 Comm: vsftpd Tainted: G
I 4.9.44-040944-generic #201708161731
[Wed Aug 30 14:17:04 2017] Hardware name: HP ProLiant DL360 G6, BIOS
P64 08/16/2015
[Wed Aug 30 14:17:04 2017] task: ffff9268331bc080 task.stack: ffffab4a96988000
[Wed Aug 30 14:17:04 2017] RIP: 0010:[<ffffffffc09c44f7>]
[<ffffffffc09c44f7>] send_request+0xa27/0xab0 [libceph]
[Wed Aug 30 14:17:04 2017] RSP: 0018:ffffab4a9698b8e8 EFLAGS: 00010293
[Wed Aug 30 14:17:04 2017] RAX: 0000000000000000 RBX: 0000000000002201
RCX: ffff925e48490000
[Wed Aug 30 14:17:04 2017] RDX: ffff926242fcf553 RSI: 0000000000001295
RDI: 0000000000002201
[Wed Aug 30 14:17:04 2017] RBP: ffffab4a9698b958 R08: ffff92685f95c9e0
R09: 0000000000000000
[Wed Aug 30 14:17:04 2017] R10: 0000000000000000 R11: ffff926842265680
R12: ffff92684078c610
[Wed Aug 30 14:17:04 2017] R13: 0000000000000001 R14: ffff926242fc608b
R15: ffff92684078c610
[Wed Aug 30 14:17:04 2017] FS: 00007f5b59fd5700(0000)
GS:ffff92685f940000(0000) knlGS:0000000000000000
[Wed Aug 30 14:17:04 2017] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Wed Aug 30 14:17:04 2017] CR2: 00007fec2bb2f003 CR3: 000000068ef59000
CR4: 00000000000006e0
[Wed Aug 30 14:17:04 2017] Stack:
[Wed Aug 30 14:17:04 2017] 01ffffffc09b9cd7 ffff92685f959300
0000000000000067 ffff9268331bc080
[Wed Aug 30 14:17:04 2017] ffff926242fc7000 ffff926241a3e000
ffff926840215200 00000e8100002201
[Wed Aug 30 14:17:04 2017] 0000000000000000 ffff92684078c610
ffff926841ddf7c0 0000000000000000
[Wed Aug 30 14:17:04 2017] Call Trace:
[Wed Aug 30 14:17:04 2017] [<ffffffffc09c815a>]
__submit_request+0x20a/0x2f0 [libceph]
[Wed Aug 30 14:17:04 2017] [<ffffffffc09c826b>]
submit_request+0x2b/0x30 [libceph]
[Wed Aug 30 14:17:05 2017] [<ffffffffc09c8c14>]
ceph_osdc_writepages+0x104/0x1a0 [libceph]
[Wed Aug 30 14:17:05 2017] [<ffffffffc0a0f4b1>]
writepage_nounlock+0x2c1/0x470 [ceph]
[Wed Aug 30 14:17:05 2017] [<ffffffffa65f120a>] ? page_mkclean+0x6a/0xb0
[Wed Aug 30 14:17:05 2017] [<ffffffffa65ef3b0>] ?
__page_check_address+0x1c0/0x1c0
[Wed Aug 30 14:17:05 2017] [<ffffffffc0a11f9c>]
ceph_update_writeable_page+0xdc/0x4a0 [ceph]
[Wed Aug 30 14:17:05 2017] [<ffffffffa65a974d>] ?
pagecache_get_page+0x17d/0x2a0
[Wed Aug 30 14:17:05 2017] [<ffffffffc0a123ca>]
ceph_write_begin+0x6a/0x120 [ceph]
[Wed Aug 30 14:17:05 2017] [<ffffffffa65a89b8>]
generic_perform_write+0xc8/0x1c0
[Wed Aug 30 14:17:05 2017] [<ffffffffa66592ee>] ? file_update_time+0x5e/0x110
[Wed Aug 30 14:17:05 2017] [<ffffffffc0a0c402>]
ceph_write_iter+0xba2/0xbe0 [ceph]
[Wed Aug 30 14:17:05 2017] [<ffffffffa6b6238c>] ? release_sock+0x8c/0xa0
[Wed Aug 30 14:17:05 2017] [<ffffffffa6bce0b9>] ? tcp_recvmsg+0x4c9/0xb50
[Wed Aug 30 14:17:05 2017] [<ffffffffa6b5d65d>] ? sock_recvmsg+0x3d/0x50
[Wed Aug 30 14:17:05 2017] [<ffffffffa663ad45>] __vfs_write+0xe5/0x160
[Wed Aug 30 14:17:05 2017] [<ffffffffa663bfe5>] vfs_write+0xb5/0x1a0
[Wed Aug 30 14:17:05 2017] [<ffffffffa663d465>] SyS_write+0x55/0xc0
[Wed Aug 30 14:17:05 2017] [<ffffffffa6c9b9bb>]
entry_SYSCALL_64_fastpath+0x1e/0xad
[Wed Aug 30 14:17:05 2017] Code: fb ab e5 e9 de f6 ff ff ba 14 00 00
00 e9 42 f7 ff ff 49 c7 46 08 00 00 00 00 41 c7 46 10 00 00 00 00 49
8d 56 14 e9 6d fb ff ff <0f> 0b 0f 0b be 8f 05 00 00 48 c7 c7 d8 0c 9e
c0 e8 b4 fb ab e5
[Wed Aug 30 14:17:05 2017] RIP [<ffffffffc09c44f7>]
send_request+0xa27/0xab0 [libceph]
[Wed Aug 30 14:17:05 2017] RSP <ffffab4a9698b8e8>
[Wed Aug 30 14:17:05 2017] ---[ end trace 5c55854998e663dc ]---
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