gfs2: fsid=loop3: Now mounting FS... gfs2: fsid=loop3.0: journal 0 mapped with 1 extents in 0ms gfs2: fsid=loop3.0: jid=0, already locked for use gfs2: fsid=loop3.0: jid=0: Looking at journal... ------------[ cut here ]------------ WARNING: CPU: 1 PID: 4440 at include/linux/backing-dev.h:349 inode_to_wb include/linux/backing-dev.h:346 [inline] WARNING: CPU: 1 PID: 4440 at include/linux/backing-dev.h:349 account_page_dirtied+0x65a/0x870 mm/page-writeback.c:2422 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 4440 Comm: syz-executor2 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x12f/0x187 lib/dump_stack.c:118 panic+0x22a/0x4f5 kernel/panic.c:221 __warn.cold.10+0x25/0x28 kernel/panic.c:582 report_bug+0x1b0/0x270 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:inode_to_wb include/linux/backing-dev.h:346 [inline] RIP: 0010:account_page_dirtied+0x65a/0x870 mm/page-writeback.c:2422 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 8e de ca ff 85 c0 0f 85 60 fb ff ff <0f> 0b e9 59 fb ff ff 4c 89 ee 4c 89 f7 e8 f4 69 28 00 e9 0a fb ff gfs2: fsid=loop3.0: jid=0: Journal head lookup took 111ms RSP: 0018:ffff8881c582f790 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8881c891f3a8 RCX: ffff8881c7d5ae18 RDX: 1ffffffff10a6a27 RSI: ffff8881c576d070 RDI: 0000000000000082 RBP: ffff8881c582f7c0 R08: ffffed1039123e76 R09: ffffed1039123e76 R10: ffffed1039123e75 R11: ffff8881c891f3af R12: ffff8881c891f218 gfs2: fsid=loop5.0: found 1 quota changes R13: ffffea0006d62e40 R14: ffff8881c891f218 R15: 0000000000000282 __set_page_dirty+0x6f/0x250 fs/buffer.c:623 mark_buffer_dirty+0x2c4/0x3c0 fs/buffer.c:1152 gfs2_unpin+0xdf/0xe00 fs/gfs2/lops.c:107 buf_lo_after_commit+0x129/0x210 fs/gfs2/lops.c:735 lops_after_commit fs/gfs2/lops.h:62 [inline] gfs2_log_flush+0x9c4/0x1fa0 fs/gfs2/log.c:842 gfs2: fsid=loop3.0: jid=0: Done do_sync+0x4d3/0xa50 fs/gfs2/quota.c:958 gfs2: fsid=loop3.0: first mount done, others may mount gfs2_quota_sync+0x254/0x4f0 fs/gfs2/quota.c:1301 gfs2_sync_fs+0x41/0xa0 fs/gfs2/super.c:712 __sync_filesystem fs/sync.c:39 [inline] sync_filesystem+0xd7/0x200 fs/sync.c:64 generic_shutdown_super+0x69/0x330 fs/super.c:448 kill_block_super+0x96/0xe0 fs/super.c:1444 gfs2: fsid=loop1.0: found 1 quota changes gfs2_kill_sb+0x100/0x150 fs/gfs2/ops_fstype.c:1625 deactivate_locked_super+0x7c/0xd0 fs/super.c:335 deactivate_super+0x136/0x150 fs/super.c:366 gfs2: fsid=loop4.0: found 1 quota changes cleanup_mnt+0x204/0x440 fs/namespace.c:1102 __cleanup_mnt+0xd/0x10 fs/namespace.c:1109 task_work_run+0x10e/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x1be/0x210 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x50b/0x600 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4579d7 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 RSP: 002b:00007ffd455d1e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000004579d7 RDX: 0000000001428983 RSI: 0000000000000002 RDI: 00007ffd455d2fc0 RBP: 00007ffd455d2fc0 R08: 0000000000000000 R09: 0000000000000009 R10: 0000000000000005 R11: 0000000000000246 R12: 0000000001428940 R13: 0000000000000000 R14: 0000000000000002 R15: 000000000000c330 Kernel Offset: disabled Rebooting in 86400 seconds..