[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 45.645774] can: request_module (can-proto-0) failed. [ 45.656106] can: request_module (can-proto-0) failed. [ 46.473214] IPVS: ftp: loaded support on port[0] = 21 [ 47.132901] 8021q: adding VLAN 0 to HW filter on device bond0 [ 47.201920] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 47.494365] tipc: TX() has been purged, node left! [ 49.013723] bond0 (unregistering): Released all slaves Warning: Permanently added '10.128.10.34' (ECDSA) to the list of known hosts. 2020/03/17 03:49:21 parsed 1 programs 2020/03/17 03:49:21 executed programs: 0 [ 54.252620] IPVS: ftp: loaded support on port[0] = 21 [ 54.316605] IPVS: ftp: loaded support on port[0] = 21 [ 54.352919] IPVS: ftp: loaded support on port[0] = 21 [ 54.369859] IPVS: ftp: loaded support on port[0] = 21 [ 54.384712] IPVS: ftp: loaded support on port[0] = 21 [ 54.395339] IPVS: ftp: loaded support on port[0] = 21 [ 54.420699] gfs2: fsid=loop2: Trying to join cluster "lock_nolock", "loop2" [ 54.428148] gfs2: fsid=loop2: Now mounting FS... [ 54.447497] gfs2: fsid=loop2.0: journal 0 mapped with 1 extents in 0ms [ 54.454503] gfs2: fsid=loop2.0: jid=0, already locked for use [ 54.460530] gfs2: fsid=loop2.0: jid=0: Looking at journal... [ 54.523102] gfs2: fsid=loop2.0: jid=0: Journal head lookup took 62ms [ 54.538716] gfs2: fsid=loop2.0: jid=0: Done [ 54.543399] gfs2: fsid=loop2.0: first mount done, others may mount [ 54.581086] gfs2: fsid=loop4: Trying to join cluster "lock_nolock", "loop4" [ 54.588306] gfs2: fsid=loop4: Now mounting FS... [ 54.607333] gfs2: fsid=loop4.0: journal 0 mapped with 1 extents in 0ms [ 54.614246] gfs2: fsid=loop4.0: jid=0, already locked for use [ 54.620273] gfs2: fsid=loop4.0: jid=0: Looking at journal... [ 54.702250] gfs2: fsid=loop2.0: found 1 quota changes [ 54.811023] gfs2: fsid=loop3: Trying to join cluster "lock_nolock", "loop3" [ 54.818365] gfs2: fsid=loop3: Now mounting FS... [ 54.827689] gfs2: fsid=loop1: Trying to join cluster "lock_nolock", "loop1" [ 54.832297] gfs2: fsid=loop4.0: jid=0: Journal head lookup took 212ms [ 54.834877] gfs2: fsid=loop1: Now mounting FS... [ 54.848948] gfs2: fsid=loop1.0: journal 0 mapped with 1 extents in 0ms RESULT: signal 0, coverage 0 errno 0 [ 54.854810] gfs2: fsid=loop0: Trying to join cluster "lock_nolock", "loop0" [ 54.855842] gfs2: fsid=loop1.0: jid=0, already locked for use [ 54.862885] gfs2: fsid=loop0: Now mounting FS... [ 54.874073] gfs2: fsid=loop1.0: jid=0: Looking at journal... [ 54.890812] gfs2: fsid=loop5: Trying to join cluster "lock_nolock", "loop5" [ 54.898070] gfs2: fsid=loop5: Now mounting FS... [ 54.906182] gfs2: fsid=loop4.0: jid=0: Done [ 54.910751] gfs2: fsid=loop4.0: first mount done, others may mount [ 54.930711] gfs2: fsid=loop0.0: journal 0 mapped with 1 extents in 0ms [ 54.939122] gfs2: fsid=loop3.0: journal 0 mapped with 1 extents in 0ms [ 54.949553] gfs2: fsid=loop0.0: jid=0, already locked for use [ 54.955510] gfs2: fsid=loop0.0: jid=0: Looking at journal... [ 54.972568] ------------[ cut here ]------------ [ 54.974644] gfs2: fsid=loop1.0: jid=0: Journal head lookup took 100ms [ 54.977454] WARNING: CPU: 1 PID: 4430 at include/linux/backing-dev.h:349 account_page_dirtied+0x65a/0x870 [ 54.984314] gfs2: fsid=loop1.0: jid=0: Done [ 54.993744] Kernel panic - not syncing: panic_on_warn set ... [ 54.993751] CPU: 1 PID: 4430 Comm: syz-executor2 Not tainted 5.6.0-rc6-syzkaller #0 [ 54.993754] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.993757] Call Trace: [ 54.993770] dump_stack+0x12f/0x187 [ 54.993783] ? account_page_dirtied+0x65a/0x870 [ 54.993789] panic+0x22a/0x4f5 [ 54.998492] gfs2: fsid=loop1.0: first mount done, others may mount [ 55.003965] ? add_taint.cold.7+0x11/0x11 [ 55.003987] __warn.cold.10+0x25/0x28 [ 55.004003] ? account_page_dirtied+0x65a/0x870 [ 55.054422] report_bug+0x1b0/0x270 [ 55.058064] do_error_trap+0x11b/0x200 [ 55.061960] do_invalid_op+0x36/0x40 [ 55.065670] ? account_page_dirtied+0x65a/0x870 [ 55.070512] invalid_op+0x23/0x30 [ 55.073962] RIP: 0010:account_page_dirtied+0x65a/0x870 [ 55.079237] Code: c1 ea 03 80 3c 02 00 0f 85 25 02 00 00 49 8b 86 90 01 00 00 be ff ff ff ff 48 8d 78 70 e8 ae db ca ff 85 c0 0f 85 60 fb ff ff <0f> 0b e9 59 fb ff ff 4c 89 ee 4c 89 f7 e8 54 6d 28 00 e9 0a fb ff [ 55.098147] RSP: 0018:ffff8881c5ccf790 EFLAGS: 00010046 [ 55.102028] gfs2: fsid=loop1.0: found 1 quota changes [ 55.103509] RAX: 0000000000000000 RBX: ffff8881c849d6a8 RCX: ffff8881c6104898 [ 55.103513] RDX: 1ffffffff10e69e8 RSI: ffff8881b6ba3070 RDI: 0000000000000082 RESULT: signal 0, coverage 0 errno 0 [ 55.103517] RBP: ffff8881c5ccf7c0 R08: ffffed1039093ad6 R09: ffffed1039093ad6 [ 55.103520] R10: ffffed1039093ad5 R11: ffff8881c849d6af R12: ffff8881c849d518 [ 55.103524] R13: ffffea0006d36540 R14: ffff8881c849d518 R15: 0000000000000282 [ 55.103562] __set_page_dirty+0x6f/0x250 [ 55.103572] mark_buffer_dirty+0x2c4/0x3c0 [ 55.153399] gfs2_unpin+0xdf/0xe00 [ 55.156958] buf_lo_after_commit+0x129/0x210 [ 55.161386] gfs2_log_flush+0x9c4/0x1fa0 [ 55.165460] ? lock_downgrade+0x900/0x900 [ 55.169622] ? log_write_header+0xeb0/0xeb0 [ 55.173974] ? mark_held_locks+0xb7/0x130 [ 55.178137] ? kfree+0x132/0x290 [ 55.181514] ? do_sync+0x482/0xa50 [ 55.185083] ? lockdep_hardirqs_on+0x42d/0x5d0 [ 55.189689] ? kfree+0x132/0x290 [ 55.193060] ? trace_hardirqs_on+0x28/0x180 [ 55.197402] ? do_sync+0x482/0xa50 [ 55.200958] do_sync+0x4d3/0xa50 [ 55.204335] ? gfs2_set_dqblk+0xb60/0xb60 [ 55.209058] ? lock_downgrade+0x900/0x900 [ 55.213237] ? rwlock_bug.part.0+0x90/0x90 [ 55.217468] ? lock_acquire+0x194/0x3e0 [ 55.221454] ? do_raw_spin_unlock+0x177/0x260 [ 55.225961] gfs2_quota_sync+0x254/0x4f0 [ 55.230042] gfs2_sync_fs+0x41/0xa0 [ 55.233676] sync_filesystem+0xd7/0x200 [ 55.237653] generic_shutdown_super+0x69/0x330 [ 55.242239] kill_block_super+0x96/0xe0 [ 55.246220] gfs2_kill_sb+0x100/0x150 [ 55.250022] deactivate_locked_super+0x7c/0xd0 [ 55.254620] deactivate_super+0x136/0x150 [ 55.258775] ? mount_bdev+0x340/0x340 [ 55.262602] ? dput.part.30+0x12d/0xab0 [ 55.266587] ? mnt_get_writers.isra.29+0xb3/0x140 [ 55.271437] cleanup_mnt+0x204/0x440 [ 55.275153] ? trace_hardirqs_on+0x28/0x180 [ 55.279484] __cleanup_mnt+0xd/0x10 [ 55.283110] task_work_run+0x10e/0x190 [ 55.287010] exit_to_usermode_loop+0x1be/0x210 [ 55.291596] do_syscall_64+0x53d/0x630 [ 55.292616] gfs2: fsid=loop4.0: found 1 quota changes [ 55.295488] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 55.295494] RIP: 0033:0x4579d7 [ 55.295501] Code: 44 00 00 b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd 8f fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 dd 8f fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 55.295505] RSP: 002b:00007ffc837458b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 [ 55.295511] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000004579d7 [ 55.295514] RDX: 00000000016099db RSI: 0000000000000002 RDI: 00007ffc83746a20 [ 55.295518] RBP: 00007ffc83746a20 R08: 0000000000000000 R09: 0000000000000009 [ 55.295520] R10: 0000000000000005 R11: 0000000000000246 R12: 0000000001609940 [ 55.295524] R13: 0000000000000000 R14: 0000000000000002 R15: 000000000000d41e [ 55.301963] Kernel Offset: disabled [ 55.377259] Rebooting in 86400 seconds..