gfs2: fsid=syz:syz.0: jid=0, already locked for use
gfs2: fsid=syz:syz.0: jid=0: Looking at journal...
gfs2: fsid=syz:syz.0: jid=0: Done
gfs2: fsid=syz:syz.0: first mount done, others may mount
gfs2: fsid=syz:syz.0: found 1 quota changes
WARNING: CPU: 1 PID: 8134 at include/linux/backing-dev.h:339 inode_to_wb include/linux/backing-dev.h:339 [inline]
WARNING: CPU: 1 PID: 8134 at include/linux/backing-dev.h:339 account_page_dirtied+0x8cc/0xbb0 mm/page-writeback.c:2420
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 8134 Comm: syz-executor.1 Not tainted 4.19.167-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+0x1fc/0x2fe lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x61 kernel/panic.c:541
 report_bug+0x262/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:inode_to_wb include/linux/backing-dev.h:339 [inline]
RIP: 0010:account_page_dirtied+0x8cc/0xbb0 mm/page-writeback.c:2420
Code: 88 01 00 00 be ff ff ff ff 48 8d 78 70 e8 5c ae c9 ff 31 ff 89 c3 89 c6 e8 71 80 e2 ff 85 db 0f 85 39 f9 ff ff e8 f4 7e e2 ff <0f> 0b e9 2d f9 ff ff e8 e8 7e e2 ff 4c 89 e6 4c 89 ef e8 5d f9 2d
RSP: 0018:ffff88809f83f7d8 EFLAGS: 00010093
RAX: ffff88809ecdc280 RBX: 0000000000000000 RCX: ffffffff818252ff
RDX: 0000000000000000 RSI: ffffffff8182530c RDI: 0000000000000005
RBP: ffff8880b1b06420 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffffea0002ca6cc0
R13: ffff8880b1b06298 R14: ffff8880adf42ab0 R15: ffffea0002ca6cc8
 __set_page_dirty+0x7f/0x3e0 fs/buffer.c:582
 mark_buffer_dirty+0x424/0x5c0 fs/buffer.c:1111
 gfs2_unpin+0xd6/0xe80 fs/gfs2/lops.c:108
 buf_lo_after_commit+0x140/0x210 fs/gfs2/lops.c:512
 lops_after_commit fs/gfs2/lops.h:67 [inline]
 gfs2_log_flush+0x9fa/0x1ef0 fs/gfs2/log.c:831
 do_sync+0x534/0xc90 fs/gfs2/quota.c:961
 gfs2_quota_sync+0x5d1/0x780 fs/gfs2/quota.c:1303
 gfs2_sync_fs+0x40/0xb0 fs/gfs2/super.c:957
 __sync_filesystem fs/sync.c:39 [inline]
 sync_filesystem+0x105/0x250 fs/sync.c:64
 generic_shutdown_super+0x70/0x370 fs/super.c:442
 kill_block_super+0x97/0xf0 fs/super.c:1185
 gfs2_kill_sb+0x12c/0x1a0 fs/gfs2/ops_fstype.c:1390
 deactivate_locked_super+0x94/0x160 fs/super.c:329
 deactivate_super+0x174/0x1a0 fs/super.c:360
 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x460c47
Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 2f be ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffff0914b48 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000bb8 RCX: 0000000000460c47
RDX: 00000000004033a8 RSI: 0000000000000002 RDI: 00007ffff0914bf0
RBP: 000000000003582b R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000005 R11: 0000000000000246 R12: 00007ffff0915ca0
R13: 0000000001c89a60 R14: 0000000000000000 R15: 000000000003555f
Kernel Offset: disabled
Rebooting in 86400 seconds..