loop0: detected capacity change from 0 to 32768
 ... Log Wrap ... Log Wrap ... Log Wrap ...
BUG at fs/jfs/jfs_dmap.c:2975 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2975!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5341 Comm: syz.0.0 Not tainted 6.16.0-rc5-syzkaller-00276-g5d5d62298b8b #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:dbFindLeaf+0x51d/0x520 fs/jfs/jfs_dmap.c:2975
Code: e9 4c ff ff ff e8 63 91 82 fe 48 c7 c7 00 d0 c3 8b 48 c7 c6 40 cd c3 8b ba 9f 0b 00 00 48 c7 c1 c0 da c3 8b e8 f4 fa e9 fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57
RSP: 0018:ffffc9000d6475f8 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 4cdbf4e91ca23f00
RDX: ffffc9000e25a000 RSI: 0000000000000dc2 RDI: 0000000000000dc3
RBP: 0000000000000001 R08: ffffc9000d647327 R09: 1ffff92001ac8e64
R10: dffffc0000000000 R11: fffff52001ac8e65 R12: 0000000000000002
R13: 0000000000000058 R14: 0000000000000055 R15: 0000000000000155
FS:  00007f352fe1f6c0(0000) GS:ffff88808d21b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9cabd48000 CR3: 000000004339c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x60/0x3c0 fs/jfs/jfs_dmap.c:1961
 dbAlloc+0x991/0xba0 fs/jfs/jfs_dmap.c:844
 diNewExt+0x9af/0x3150 fs/jfs/jfs_imap.c:2261
 diAllocExt fs/jfs/jfs_imap.c:1952 [inline]
 diAllocAG+0xe86/0x1df0 fs/jfs/jfs_imap.c:1669
 diAlloc+0x1d5/0x1680 fs/jfs/jfs_imap.c:1590
 ialloc+0x8c/0x8f0 fs/jfs/jfs_inode.c:56
 jfs_mkdir+0x193/0xa70 fs/jfs/namei.c:225
 vfs_mkdir+0x303/0x510 fs/namei.c:4375
 do_mkdirat+0x247/0x590 fs/namei.c:4408
 __do_sys_mkdirat fs/namei.c:4425 [inline]
 __se_sys_mkdirat fs/namei.c:4423 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4423
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f352ef8e929
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:00007f352fe1f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f352f1b5fa0 RCX: 00007f352ef8e929
RDX: 0000000000000000 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f352f010b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f352f1b5fa0 R15: 00007ffd22daf6b8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x51d/0x520 fs/jfs/jfs_dmap.c:2975
Code: e9 4c ff ff ff e8 63 91 82 fe 48 c7 c7 00 d0 c3 8b 48 c7 c6 40 cd c3 8b ba 9f 0b 00 00 48 c7 c1 c0 da c3 8b e8 f4 fa e9 fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57
RSP: 0018:ffffc9000d6475f8 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 4cdbf4e91ca23f00
RDX: ffffc9000e25a000 RSI: 0000000000000dc2 RDI: 0000000000000dc3
RBP: 0000000000000001 R08: ffffc9000d647327 R09: 1ffff92001ac8e64
R10: dffffc0000000000 R11: fffff52001ac8e65 R12: 0000000000000002
R13: 0000000000000058 R14: 0000000000000055 R15: 0000000000000155
FS:  00007f352fe1f6c0(0000) GS:ffff88808d21b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000004339c000 CR4: 0000000000352ef0