syzkaller login: [ 43.839449] can: request_module (can-proto-0) failed. [ 43.844567] can: request_module (can-proto-0) failed. [ 44.719460] IPVS: ftp: loaded support on port[0] = 21 [ 44.846408] ip (3334) used greatest stack depth: 23856 bytes left [ 45.012709] ip (3413) used greatest stack depth: 23736 bytes left [ 45.512300] 8021q: adding VLAN 0 to HW filter on device bond0 [ 45.590798] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 45.859465] tipc: TX() has been purged, node left! [ 47.349014] bond0 (unregistering): Released all slaves Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. 2020/06/16 08:40:09 parsed 1 programs 2020/06/16 08:40:09 executed programs: 0 [ 53.752599] IPVS: ftp: loaded support on port[0] = 21 [ 53.790680] IPVS: ftp: loaded support on port[0] = 21 [ 53.809935] IPVS: ftp: loaded support on port[0] = 21 [ 53.820373] IPVS: ftp: loaded support on port[0] = 21 [ 53.853881] IPVS: ftp: loaded support on port[0] = 21 [ 53.885976] IPVS: ftp: loaded support on port[0] = 21 [ 53.927091] gfs2: fsid=loop3: Trying to join cluster "lock_nolock", "loop3" [ 53.934378] gfs2: fsid=loop3: Now mounting FS... [ 53.944644] gfs2: fsid=loop3.0: journal 0 mapped with 1 extents in 0ms [ 53.951709] gfs2: fsid=loop3.0: jid=0, already locked for use [ 53.957994] gfs2: fsid=loop3.0: jid=0: Looking at journal... [ 54.018690] gfs2: fsid=loop3.0: jid=0: Journal head lookup took 60ms [ 54.026656] gfs2: fsid=loop3.0: jid=0: Done [ 54.031415] gfs2: fsid=loop3.0: first mount done, others may mount [ 54.109957] gfs2: fsid=loop4: Trying to join cluster "lock_nolock", "loop4" [ 54.117255] gfs2: fsid=loop4: Now mounting FS... [ 54.160645] gfs2: fsid=loop5: Trying to join cluster "lock_nolock", "loop5" [ 54.168139] gfs2: fsid=loop5: Now mounting FS... [ 54.191789] gfs2: fsid=loop4.0: journal 0 mapped with 1 extents in 0ms [ 54.193386] gfs2: fsid=loop1: Trying to join cluster "lock_nolock", "loop1" [ 54.198878] gfs2: fsid=loop4.0: jid=0, already locked for use [ 54.206008] gfs2: fsid=loop1: Now mounting FS... [ 54.216959] gfs2: fsid=loop4.0: jid=0: Looking at journal... [ 54.225198] gfs2: fsid=loop1.0: journal 0 mapped with 1 extents in 0ms [ 54.232481] gfs2: fsid=loop1.0: jid=0, already locked for use [ 54.238757] gfs2: fsid=loop1.0: jid=0: Looking at journal... [ 54.252942] gfs2: fsid=loop2: Trying to join cluster "lock_nolock", "loop2" [ 54.260631] gfs2: fsid=loop2: Now mounting FS... [ 54.279234] gfs2: fsid=loop5.0: journal 0 mapped with 1 extents in 0ms [ 54.298854] gfs2: fsid=loop0: Trying to join cluster "lock_nolock", "loop0" [ 54.306282] gfs2: fsid=loop0: Now mounting FS... [ 54.311859] gfs2: fsid=loop4.0: jid=0: Journal head lookup took 94ms [ 54.336111] gfs2: fsid=loop0.0: journal 0 mapped with 1 extents in 0ms [ 54.339306] gfs2: fsid=loop2.0: journal 0 mapped with 1 extents in 0ms [ 54.352013] gfs2: fsid=loop4.0: jid=0: Done [ 54.356742] gfs2: fsid=loop4.0: first mount done, others may mount [ 54.386191] gfs2: fsid=loop5.0: jid=0, already locked for use [ 54.388695] gfs2: fsid=loop2.0: jid=0, already locked for use [ 54.392240] gfs2: fsid=loop5.0: jid=0: Looking at journal... [ 54.398231] gfs2: fsid=loop2.0: jid=0: Looking at journal... [ 54.411271] gfs2: fsid=loop1.0: jid=0: Journal head lookup took 172ms [ 54.418153] gfs2: fsid=loop1.0: jid=0: Done [ 54.422579] gfs2: fsid=loop1.0: first mount done, others may mount [ 54.467387] gfs2: fsid=loop0.0: jid=0, already locked for use [ 54.473367] gfs2: fsid=loop0.0: jid=0: Looking at journal... [ 54.488383] gfs2: fsid=loop5.0: jid=0: Journal head lookup took 96ms [ 54.507592] gfs2: fsid=loop5.0: jid=0: Done [ 54.512352] gfs2: fsid=loop5.0: first mount done, others may mount [ 54.554025] gfs2: fsid=loop0.0: jid=0: Journal head lookup took 80ms [ 54.561500] gfs2: fsid=loop0.0: jid=0: Done [ 54.565903] gfs2: fsid=loop0.0: first mount done, others may mount [ 54.690204] gfs2: fsid=loop2.0: jid=0: Journal head lookup took 292ms [ 54.691230] gfs2: fsid=loop3.0: found 1 quota changes [ 54.697272] gfs2: fsid=loop2.0: jid=0: Done [ 54.707063] gfs2: fsid=loop2.0: first mount done, others may mount RESULT: signal 0, coverage 0 errno -1 [ 54.858998] ------------[ cut here ]------------ [ 54.859001] WARNING: CPU: 1 PID: 3577 at include/linux/backing-dev.h:345 account_page_dirtied+0x680/0x890 [ 54.859003] Kernel panic - not syncing: panic_on_warn set ... [ 54.859004] CPU: 1 PID: 3577 Comm: syz-executor3 Not tainted 5.8.0-rc1-syzkaller #0 [ 54.859006] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.859007] Call Trace: [ 54.859008] dump_stack+0x136/0x187 [ 54.859009] ? account_page_dirtied+0x680/0x890 [ 54.859010] panic+0x22a/0x4f5 [ 54.859011] ? __warn_printk+0xd6/0xd6 [ 54.859012] ? account_page_dirtied+0x680/0x890 [ 54.859013] __warn.cold.12+0x25/0x25 [ 54.859015] ? account_page_dirtied+0x680/0x890 [ 54.859015] report_bug+0x1b5/0x260 [ 54.859016] exc_invalid_op+0x1be/0x370 [ 54.859017] asm_exc_invalid_op+0x12/0x20 [ 54.859018] RIP: 0010:account_page_dirtied+0x680/0x890 [ 54.859021] Code: c1 ea 03 80 3c 02 00 0f 85 1e 02 00 00 49 8b 86 a8 01 00 00 be ff ff ff ff 48 8d 78 70 e8 d8 69 7f 05 85 c0 0f 85 38 fb ff ff <0f> 0b e9 31 fb ff ff 4c 89 e6 4c 89 f7 e8 5e 3e 29 00 e9 e2 fa ff [ 54.859022] RSP: 0018:ffff8881ca2ef808 EFLAGS: 00010046 [ 54.859025] RAX: 0000000000000000 RBX: ffff8881d5bd1c20 RCX: ffffffff81b23ac6 [ 54.859027] RDX: 1ffffffff11286d0 RSI: ffff8881d34440e0 RDI: 0000000000000086 [ 54.859028] RBP: ffff8881ca2ef838 R08: ffffed103ab7a385 R09: ffffed103ab7a385 [ 54.859030] R10: ffff8881d5bd1c27 R11: ffffed103ab7a384 R12: ffffea0006c5a840 [ 54.859031] R13: ffff8881d5bd1a78 R14: ffff8881d5bd1a78 R15: 0000000000000286 [ 54.859032] ? __inode_attach_wb+0x166/0xad0 [ 54.859033] ? account_page_dirtied+0x678/0x890 [ 54.859035] __set_page_dirty+0x6f/0x250 [ 54.859036] mark_buffer_dirty+0x2c1/0x3c0 [ 54.859037] gfs2_unpin+0xdf/0xe00 [ 54.859038] buf_lo_after_commit+0x129/0x210 [ 54.859039] gfs2_log_flush+0x1092/0x2780 [ 54.859040] ? log_write_header+0xdd0/0xdd0 [ 54.859041] ? mark_held_locks+0xb7/0x130 [ 54.859042] ? kfree+0x132/0x290 [ 54.859043] ? do_sync+0x45e/0xb10 [ 54.859044] ? trace_hardirqs_on+0x31/0x190 [ 54.859046] ? do_sync+0x45e/0xb10 [ 54.859047] do_sync+0x4b0/0xb10 [ 54.859048] ? gfs2_qa_put+0x130/0x130 [ 54.859049] ? do_raw_spin_lock+0x129/0x2e0 [ 54.859050] ? rwlock_bug.part.1+0x90/0x90 [ 54.859051] gfs2_quota_sync+0x254/0x4f0 [ 54.859052] gfs2_sync_fs+0x41/0xa0 [ 54.859053] sync_filesystem+0xd7/0x200 [ 54.859054] generic_shutdown_super+0x69/0x330 [ 54.859055] kill_block_super+0x96/0xe0 [ 54.859056] gfs2_kill_sb+0x100/0x150 [ 54.859058] deactivate_locked_super+0x7c/0xd0 [ 54.859059] deactivate_super+0x8a/0xa0 [ 54.859060] cleanup_mnt+0x204/0x440 [ 54.859061] __cleanup_mnt+0xd/0x10 [ 54.859062] task_work_run+0xd8/0x170 [ 54.859063] __prepare_exit_to_usermode+0x1da/0x1e0 [ 54.859064] __syscall_return_slowpath+0x5a/0x250 [ 54.859065] do_syscall_64+0x7b/0xf0 [ 54.859067] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.859068] RIP: 0033:0x4579d7 [ 54.859069] Code: Bad RIP value. [ 54.859070] RSP: 002b:00007ffd9d58ba18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 [ 54.859073] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000004579d7 [ 54.859074] RDX: 000000000248e983 RSI: 0000000000000002 RDI: 00007ffd9d58cb80 [ 54.859076] RBP: 00007ffd9d58cb80 R08: 0000000000000000 R09: 0000000000000009 [ 54.859077] R10: 0000000000000005 R11: 0000000000000246 R12: 000000000248e940 [ 54.859079] R13: 0000000000000000 R14: 0000000000000002 R15: 000000000000d282 [ 54.859820] Kernel Offset: disabled