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
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6365 at include/linux/backing-dev.h:334 inode_to_wb include/linux/backing-dev.h:334 [inline]
WARNING: CPU: 1 PID: 6365 at include/linux/backing-dev.h:334 account_page_dirtied+0x7c7/0xa20 mm/page-writeback.c:2437
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 6365 Comm: syz-executor.0 Not tainted 4.14.198-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x4b kernel/panic.c:547
 report_bug+0x208/0x249 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:inode_to_wb include/linux/backing-dev.h:334 [inline]
RIP: 0010:account_page_dirtied+0x7c7/0xa20 mm/page-writeback.c:2437
RSP: 0000:ffff8880a829f888 EFLAGS: 00010097
RAX: ffff8880881a4340 RBX: ffff8880a437a3c0 RCX: 1ffffffff1027c74
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000086
RBP: ffff8880a6abfa28 R08: ffffffff8a083cf0 R09: 00000000000c022c
R10: ffff8880881a4c68 R11: ffff8880881a4340 R12: ffffea0001386780
R13: ffff8880a6abf898 R14: ffff8880a6abf898 R15: ffffea00013867a0
 __set_page_dirty+0x77/0x2a0 fs/buffer.c:634
 mark_buffer_dirty+0x307/0x480 fs/buffer.c:1173
 gfs2_unpin+0xac/0xe80 fs/gfs2/lops.c:107
 buf_lo_after_commit+0x12d/0x1f0 fs/gfs2/lops.c:510
 lops_after_commit fs/gfs2/lops.h:64 [inline]
 gfs2_log_flush+0x89a/0x1ba0 fs/gfs2/log.c:761
 do_sync+0x4bb/0xba0 fs/gfs2/quota.c:958
 gfs2_quota_sync+0x4f1/0x690 fs/gfs2/quota.c:1299
 gfs2_sync_fs+0x40/0xa0 fs/gfs2/super.c:946
 __sync_filesystem fs/sync.c:39 [inline]
 sync_filesystem fs/sync.c:64 [inline]
 sync_filesystem+0xe2/0x230 fs/sync.c:48
 generic_shutdown_super+0x70/0x370 fs/super.c:432
 kill_block_super+0x95/0xe0 fs/super.c:1161
 gfs2_kill_sb+0x12c/0x1a0 fs/gfs2/ops_fstype.c:1405
 deactivate_locked_super+0x6c/0xd0 fs/super.c:319
 deactivate_super+0x7f/0xa0 fs/super.c:350
 cleanup_mnt+0x186/0x2c0 fs/namespace.c:1183
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x460ba7
RSP: 002b:00007ffce41ccf08 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000460ba7
RDX: 00000000004031b8 RSI: 0000000000000002 RDI: 00007ffce41ccfb0
RBP: 00000000000002e3 R08: 0000000000000000 R09: 000000000000000b
R10: 0000000000000005 R11: 0000000000000246 R12: 00007ffce41ce040
R13: 0000000001710a60 R14: 0000000000000000 R15: 00007ffce41ce040
Kernel Offset: disabled
Rebooting in 86400 seconds..