loop0: detected capacity change from 0 to 32768
gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz"
gfs2: fsid=syz:syz: Now mounting FS (format 1801)...
gfs2: fsid=syz:syz.0: journal 0 mapped with 3 extents in 0ms
gfs2: fsid=syz:syz.0: first mount done, others may mount
gfs2: fsid=syz:syz.0: found 1 quota changes
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5329 at fs/gfs2/super.c:606 gfs2_put_super+0x912/0x950 fs/gfs2/super.c:606
Modules linked in:
CPU: 0 UID: 0 PID: 5329 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:gfs2_put_super+0x912/0x950 fs/gfs2/super.c:606
Code: ff e8 e2 f5 f8 ff 4c 89 ff e8 3a 30 00 00 4c 89 ff 48 83 c4 38 5b 41 5c 41 5d 41 5e 41 5f 5d e9 24 1e fc ff e8 8f 78 bb fd 90 <0f> 0b 90 e9 4d fa ff ff e8 81 78 bb fd e9 9c f9 ff ff 44 89 f1 80
RSP: 0018:ffffc9000d3578d0 EFLAGS: 00010293
RAX: ffffffff84049da1 RBX: 0000000000000000 RCX: ffff888000312480
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88803aa788b0 R08: ffff88803aa780af R09: 1ffff1100754f015
R10: dffffc0000000000 R11: ffffed100754f016 R12: ffff88803aa780a8
R13: ffff88803aa788b0 R14: 0000000000000800 R15: ffff88803aa78000
FS:  0000000000000000(0000) GS:ffff88808d730000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f470b8669a0 CR3: 0000000050216000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 generic_shutdown_super+0x135/0x2c0 fs/super.c:642
 kill_block_super+0x44/0x90 fs/super.c:1722
 deactivate_locked_super+0xbc/0x130 fs/super.c:473
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1327
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6b5/0x2300 kernel/exit.c:966
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f470a98f6c9
Code: Unable to access opcode bytes at 0x7f470a98f69f.
RSP: 002b:00007f470b8870e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f470abe5fa8 RCX: 00007f470a98f6c9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f470abe5fac
RBP: 00007f470abe5fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f470abe6038 R14: 00007fff88eda950 R15: 00007fff88edaa38
 </TASK>