syzbot

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kernel BUG at fs/gfs2/super.c:76!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5448 Comm: syz-executor 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 82 f5 15 fe e9 d8 fd ff ff e8 68 ab 80 07 e8 33 17 ac 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:ffffc90002807bc0 EFLAGS: 00010293
RAX: ffffffff8418728d RBX: dead000000000122 RCX: ffff888000148000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc90002807c80 R08: ffff88803bf40e37 R09: 1ffff110077e81c6
R10: dffffc0000000000 R11: ffffed10077e81c7 R12: ffff88803bf40908
R13: dffffc0000000000 R14: ffff88803884ea00 R15: ffff88803884ea78
FS:  00005555918cd500(0000) GS:ffff88808cce8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560c0d17db68 CR3: 0000000012c81000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 gfs2_put_super+0x7d9/0x860 fs/gfs2/super.c:636
 generic_shutdown_super+0x135/0x2c0 fs/super.c:643
 kill_block_super+0x44/0x90 fs/super.c:1722
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 cleanup_mnt+0x437/0x4d0 fs/namespace.c:1318
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
 exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2b7/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f708a59c117
Code: a2 c7 05 7c c4 24 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffcacd0d428 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f708a60471f RCX: 00007f708a59c117
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcacd0d4e0
RBP: 00007ffcacd0d4e0 R08: 00007ffcacd0e4e0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcacd0e570
R13: 00007f708a60471f R14: 000000000001b122 R15: 00007ffcacd0e5b0
 </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 82 f5 15 fe e9 d8 fd ff ff e8 68 ab 80 07 e8 33 17 ac 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:ffffc90002807bc0 EFLAGS: 00010293
RAX: ffffffff8418728d RBX: dead000000000122 RCX: ffff888000148000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc90002807c80 R08: ffff88803bf40e37 R09: 1ffff110077e81c6
R10: dffffc0000000000 R11: ffffed10077e81c7 R12: ffff88803bf40908
R13: dffffc0000000000 R14: ffff88803884ea00 R15: ffff88803884ea78
FS:  00005555918cd500(0000) GS:ffff88808cce8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560c0d191458 CR3: 0000000012c81000 CR4: 0000000000352ef0