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 1 extents in 9ms
gfs2: fsid=syz:syz.0: first mount done, others may mount
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5320 at fs/gfs2/super.c:606 gfs2_put_super+0x912/0x950 fs/gfs2/super.c:606
Modules linked in:
CPU: 0 UID: 0 PID: 5320 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 0f 7c bb fd 90 <0f> 0b 90 e9 4d fa ff ff e8 01 7c bb fd e9 9c f9 ff ff 44 89 f1 80
RSP: 0018:ffffc9000d51fcb0 EFLAGS: 00010287
RAX: ffffffff84049791 RBX: 0000000000000000 RCX: 0000000000100000
RDX: ffffc9000de62000 RSI: 00000000000238b1 RDI: 00000000000238b2
RBP: ffff8880114d88b0 R08: ffff8880114d80af R09: 1ffff1100229b015
R10: dffffc0000000000 R11: ffffed100229b016 R12: ffff8880114d80a8
R13: ffff8880114d88b0 R14: 0000000000000800 R15: ffff8880114d8000
FS:  00007fa0bebcf6c0(0000) GS:ffff88808d733000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f95fbe5a540 CR3: 0000000019e19000 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
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43
 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: 0033:0x7fa0bdd8efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa0bebcf038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fa0bdfe5fa0 RCX: 00007fa0bdd8efc9
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000003
RBP: 00007fa0bde11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa0bdfe6038 R14: 00007fa0bdfe5fa0 R15: 00007ffe9aa84a78
 </TASK>