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 9 extents in 0ms
gfs2: fsid=syz:syz.0: first mount done, others may mount
gfs2: fsid=syz:syz.0: found 1 quota changes
gfs2: fsid=syz:syz.0: fatal: I/O error - block = 8589934885, function = gfs2_ail1_empty_one, file = fs/gfs2/log.c, line = 326
CPU: 0 UID: 0 PID: 5322 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 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 gfs2_withdraw+0xc3/0x1b0 fs/gfs2/util.c:250
 gfs2_ail1_empty_one fs/gfs2/log.c:326 [inline]
 gfs2_ail1_empty+0x2ba/0x7c0 fs/gfs2/log.c:360
 gfs2_flush_revokes+0x5c/0x80 fs/gfs2/log.c:804
 revoke_lo_before_commit+0x2f/0xe70 fs/gfs2/lops.c:856
 lops_before_commit fs/gfs2/lops.h:42 [inline]
 gfs2_log_flush+0xa6e/0x2510 fs/gfs2/log.c:1096
 gfs2_kill_sb+0x5c/0x430 fs/gfs2/ops_fstype.c:1779
 deactivate_locked_super+0xbc/0x130 fs/super.c:476
 cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x70f/0x23c0 kernel/exit.c:976
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1118
 get_signal+0x1284/0x1330 kernel/signal.c:3038
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
 irqentry_exit+0x176/0x620 kernel/entry/common.c:219
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f297c853b98
Code: Unable to access opcode bytes at 0x7f297c853b6e.
RSP: 002b:00007f297d7a9430 EFLAGS: 00010202
RAX: 0000000000116000 RBX: 00007f297d7a94f0 RCX: 000000000000001e
RDX: 0000000000003fff RSI: 0000000000001000 RDI: 00007f297d7a9590
RBP: 000000000000001f R08: 00007f2970800000 R09: 0000000000000001
R10: 0000200000024ac2 R11: 0000000000012586 R12: 0000000000000c01
R13: 00007f297ca52600 R14: 0000000000000017 R15: 00007f297d7a9590
 </TASK>
gfs2: fsid=syz:syz.0: about to withdraw this file system
------------[ cut here ]------------
kernel BUG at fs/gfs2/super.c:76!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5322 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 04/01/2014
RIP: 0010:gfs2_jindex_free+0x44e/0x450 fs/gfs2/super.c:76
Code: cc cc cc cc cc 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c e2 fd ff ff e8 52 99 0a fe e9 d8 fd ff ff e8 38 e0 8b 07 e8 63 b5 9e fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6
RSP: 0018:ffffc9000ef47860 EFLAGS: 00010293
RAX: ffffffff8426f20d RBX: dead000000000122 RCX: ffff8880001da4c0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc9000ef47920 R08: ffff8880125ece37 R09: 1ffff110024bd9c6
R10: dffffc0000000000 R11: ffffed10024bd9c7 R12: ffff8880125ec908
R13: dffffc0000000000 R14: ffff88801f9e6c00 R15: ffff88801f9e6c78
FS:  0000000000000000(0000) GS:ffff88808ca40000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d894c08220 CR3: 000000000e54c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 gfs2_put_super+0x7d9/0x860 fs/gfs2/super.c:638
 generic_shutdown_super+0x13d/0x2d0 fs/super.c:646
 kill_block_super+0x44/0x90 fs/super.c:1725
 deactivate_locked_super+0xbc/0x130 fs/super.c:476
 cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x70f/0x23c0 kernel/exit.c:976
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1118
 get_signal+0x1284/0x1330 kernel/signal.c:3038
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
 irqentry_exit+0x176/0x620 kernel/entry/common.c:219
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f297c853b98
Code: Unable to access opcode bytes at 0x7f297c853b6e.
RSP: 002b:00007f297d7a9430 EFLAGS: 00010202
RAX: 0000000000116000 RBX: 00007f297d7a94f0 RCX: 000000000000001e
RDX: 0000000000003fff RSI: 0000000000001000 RDI: 00007f297d7a9590
RBP: 000000000000001f R08: 00007f2970800000 R09: 0000000000000001
R10: 0000200000024ac2 R11: 0000000000012586 R12: 0000000000000c01
R13: 00007f297ca52600 R14: 0000000000000017 R15: 00007f297d7a9590
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:gfs2_jindex_free+0x44e/0x450 fs/gfs2/super.c:76
Code: cc cc cc cc cc 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c e2 fd ff ff e8 52 99 0a fe e9 d8 fd ff ff e8 38 e0 8b 07 e8 63 b5 9e fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6
RSP: 0018:ffffc9000ef47860 EFLAGS: 00010293
RAX: ffffffff8426f20d RBX: dead000000000122 RCX: ffff8880001da4c0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc9000ef47920 R08: ffff8880125ece37 R09: 1ffff110024bd9c6
R10: dffffc0000000000 R11: ffffed10024bd9c7 R12: ffff8880125ec908
R13: dffffc0000000000 R14: ffff88801f9e6c00 R15: ffff88801f9e6c78
FS:  0000000000000000(0000) GS:ffff88808ca40000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d894c08220 CR3: 0000000011f73000 CR4: 0000000000352ef0