[syzbot] [jfs?] kernel BUG in dbAdjCtl

[syzbot] [jfs?] kernel BUG in dbAdjCtl

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    8f7c8b88bda4 Merge tag 'sched_ext-for-6.13' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=118a0ec0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=48190c1cdf985419
dashboard link: https://syzkaller.appspot.com/bug?extid=c745704df615dc63086f
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-8f7c8b88.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c5e6fdef85e9/vmlinux-8f7c8b88.xz
kernel image: https://storage.googleapis.com/syzbot-assets/67596a080582/bzImage-8f7c8b88.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c745704df615dc63086f@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:2591 assert(level == bmp->db_maxlevel)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2591!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5328 Comm: syz.0.0 Not tainted 6.12.0-syzkaller-01892-g8f7c8b88bda4 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:dbAdjCtl+0x9be/0x9c0 fs/jfs/jfs_dmap.c:2591
Code: e9 d7 fc ff ff e8 a2 8a 67 fe 48 c7 c7 80 48 43 8c 48 c7 c6 c0 45 43 8c ba 1f 0a 00 00 48 c7 c1 a0 4e 43 8c e8 b3 84 99 08 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41
RSP: 0018:ffffc9000d16f018 EFLAGS: 00010246
RAX: 000000000000003f RBX: 000000000000000a RCX: 1cf809a453080c00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 00000000ff000000 R08: ffffffff8174ce2c R09: 1ffff92001a2dda0
R10: dffffc0000000000 R11: fffff52001a2dda1 R12: 0000000000000000
R13: ffff88803ae98166 R14: 0000000000000004 R15: 1ffff110084e2089
FS:  00007f48802f96c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2ee4f95ed8 CR3: 0000000043526000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dbAllocDmap fs/jfs/jfs_dmap.c:2044 [inline]
 dbAllocDmapLev+0x29c/0x4a0 fs/jfs/jfs_dmap.c:1988
 dbAllocCtl+0x113/0x920 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0x28f/0x10b0 fs/jfs/jfs_dmap.c:1364
 dbAlloc+0x658/0xca0 fs/jfs/jfs_dmap.c:888
 diNewIAG fs/jfs/jfs_imap.c:2510 [inline]
 diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
 diAllocAG+0xa9d/0x1e50 fs/jfs/jfs_imap.c:1669
 diAlloc+0x1d2/0x1630 fs/jfs/jfs_imap.c:1590
 ialloc+0x8f/0x900 fs/jfs/jfs_inode.c:56
 jfs_create+0x1be/0xbb0 fs/jfs/namei.c:92
 lookup_open fs/namei.c:3649 [inline]
 open_last_lookups fs/namei.c:3748 [inline]
 path_openat+0x1c03/0x3590 fs/namei.c:3984
 do_filp_open+0x27f/0x4e0 fs/namei.c:4014
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1398
 do_sys_open fs/open.c:1413 [inline]
 __do_sys_creat fs/open.c:1491 [inline]
 __se_sys_creat fs/open.c:1485 [inline]
 __x64_sys_creat+0x123/0x170 fs/open.c:1485
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f487f57e819
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:00007f48802f9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f487f735fa0 RCX: 00007f487f57e819
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000e00
RBP: 00007f487f5f175e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f487f735fa0 R15: 00007ffc9590be38
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbAdjCtl+0x9be/0x9c0 fs/jfs/jfs_dmap.c:2591
Code: e9 d7 fc ff ff e8 a2 8a 67 fe 48 c7 c7 80 48 43 8c 48 c7 c6 c0 45 43 8c ba 1f 0a 00 00 48 c7 c1 a0 4e 43 8c e8 b3 84 99 08 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41
RSP: 0018:ffffc9000d16f018 EFLAGS: 00010246
RAX: 000000000000003f RBX: 000000000000000a RCX: 1cf809a453080c00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 00000000ff000000 R08: ffffffff8174ce2c R09: 1ffff92001a2dda0
R10: dffffc0000000000 R11: fffff52001a2dda1 R12: 0000000000000000
R13: ffff88803ae98166 R14: 0000000000000004 R15: 1ffff110084e2089
FS:  00007f48802f96c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f48802b6fe0 CR3: 0000000043526000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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