Re: [syzbot] [gfs2?] kernel BUG in __gfs2_glock_put (2)

[syzbot <syzbot+ef4ad020dc976d178975@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    c9cfc122f037 Merge tag 'for-6.18-rc4-tag' of git://git.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1721a17c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=929790bc044e87d7
dashboard link: https://syzkaller.appspot.com/bug?extid=ef4ad020dc976d178975
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11c42084580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11df2114580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-c9cfc122.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c3f2cad59d49/vmlinux-c9cfc122.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a4cfb61ba836/bzImage-c9cfc122.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/3d8068067f45/mount_0.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=104bc012580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ef4ad020dc976d178975@syzkaller.appspotmail.com

loop0: rw=12288, sector=18446744073709551608, nr_sectors = 8 limit=32768
gfs2: fsid=syz:syz.s: Error -5 locking journal for spectator mount.
gfs2: fsid=syz:syz.s: G:  s:UN n:2/ffffffffffffffff f:an t:UN d:EX/0 a:0 v:0 r:-128 m:20 p:1
------------[ cut here ]------------
kernel BUG at fs/gfs2/glock.c:274!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5494 Comm: syz.0.17 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_glock_put+0x384/0x3e0 fs/gfs2/glock.c:274
Code: 3f 48 89 de e8 7d 0f ff ff eb 26 e8 b6 38 c3 fd e9 30 fe ff ff e8 ac 38 c3 fd 31 ff 48 89 de ba 01 00 00 00 e8 2d df ff ff 90 <0f> 0b e8 95 38 c3 fd 31 f6 65 ff 0d 8c 02 72 0e 40 0f 94 c5 40 0f
RSP: 0018:ffffc90002a6f408 EFLAGS: 00010246
RAX: 29c52adf4a6b3d00 RBX: ffff88801131cfd8 RCX: ffff8880002c0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90002a6ecc7 R09: 1ffff9200054dd98
R10: dffffc0000000000 R11: fffff5200054dd99 R12: dffffc0000000000
R13: 1ffff11007cab015 R14: ffff88803e558000 R15: ffff88801131d2c8
FS:  0000555578b1a500(0000) GS:ffff88808d732000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f461a63048 CR3: 00000000126a6000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 gfs2_glock_put_eventually fs/gfs2/super.c:1183 [inline]
 gfs2_evict_inode+0xae7/0x1000 fs/gfs2/super.c:1458
 evict+0x504/0x9c0 fs/inode.c:810
 gfs2_jindex_free+0x39c/0x440 fs/gfs2/super.c:79
 init_journal+0x8f1/0x2260 fs/gfs2/ops_fstype.c:833
 init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:851
 gfs2_fill_super+0x1923/0x20d0 fs/gfs2/ops_fstype.c:1255
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691
 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1337
 vfs_get_tree+0x92/0x2b0 fs/super.c:1751
 fc_mount fs/namespace.c:1208 [inline]
 do_new_mount_fc fs/namespace.c:3651 [inline]
 do_new_mount+0x302/0xa10 fs/namespace.c:3727
 do_mount fs/namespace.c:4050 [inline]
 __do_sys_mount fs/namespace.c:4238 [inline]
 __se_sys_mount+0x313/0x410 fs/namespace.c:4215
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9033190e6a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ffc08e3a548 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc08e3a5d0 RCX: 00007f9033190e6a
RDX: 0000200000000400 RSI: 0000200000012500 RDI: 00007ffc08e3a590
RBP: 0000200000000400 R08: 00007ffc08e3a5d0 R09: 0000000000804444
R10: 0000000000804444 R11: 0000000000000246 R12: 0000200000012500
R13: 00007ffc08e3a590 R14: 0000000000012636 R15: 00002000000004c0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__gfs2_glock_put+0x384/0x3e0 fs/gfs2/glock.c:274
Code: 3f 48 89 de e8 7d 0f ff ff eb 26 e8 b6 38 c3 fd e9 30 fe ff ff e8 ac 38 c3 fd 31 ff 48 89 de ba 01 00 00 00 e8 2d df ff ff 90 <0f> 0b e8 95 38 c3 fd 31 f6 65 ff 0d 8c 02 72 0e 40 0f 94 c5 40 0f
RSP: 0018:ffffc90002a6f408 EFLAGS: 00010246
RAX: 29c52adf4a6b3d00 RBX: ffff88801131cfd8 RCX: ffff8880002c0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90002a6ecc7 R09: 1ffff9200054dd98
R10: dffffc0000000000 R11: fffff5200054dd99 R12: dffffc0000000000
R13: 1ffff11007cab015 R14: ffff88803e558000 R15: ffff88801131d2c8
FS:  0000555578b1a500(0000) GS:ffff88808d732000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd59ca21eb8 CR3: 00000000126a6000 CR4: 0000000000352ef0


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