loop6: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:3070 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3070!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 8636 Comm: syz.6.240 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:dbFindLeaf+0x519/0x520 fs/jfs/jfs_dmap.c:3070
Code: e9 4e ff ff ff e8 37 7c 56 fe 48 c7 c7 20 d1 cd 8b 48 c7 c6 60 ce cd 8b ba fe 0b 00 00 48 c7 c1 40 dc cd 8b e8 28 05 b6 fd 90 <0f> 0b 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90005daf5e0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 48baa647998c7f00
RDX: ffffc90017eab000 RSI: 000000000000182b RDI: 000000000000182c
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000bb5e6d R12: 0000000000000002
R13: 0000000000000055 R14: 0000000000000058 R15: 0000000000000155
FS:  00007f9d2a9ce6c0(0000) GS:ffff888124724000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6f4a79c000 CR3: 000000006324a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x60/0x3b0 fs/jfs/jfs_dmap.c:2056
 dbAlloc+0x993/0xba0 fs/jfs/jfs_dmap.c:931
 diNewExt+0x983/0x3020 fs/jfs/jfs_imap.c:2261
 diAllocExt fs/jfs/jfs_imap.c:1952 [inline]
 diAllocAG+0xbed/0x1de0 fs/jfs/jfs_imap.c:1669
 diAlloc+0x1de/0x1690 fs/jfs/jfs_imap.c:1590
 ialloc+0x8c/0x8e0 fs/jfs/jfs_inode.c:56
 jfs_mkdir+0x1dd/0xaf0 fs/jfs/namei.c:226
 vfs_mkdir+0x414/0x630 fs/namei.c:5422
 filename_mkdirat+0x289/0x520 fs/namei.c:5455
 __do_sys_mkdirat fs/namei.c:5476 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5473
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9d2c77e3c7
Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9d2a9cde58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f9d2a9cdee0 RCX: 00007f9d2c77e3c7
RDX: 00000000000001ff RSI: 0000200000027440 RDI: 00000000ffffff9c
RBP: 0000200000027400 R08: 0000200000027540 R09: 0000000000000000
R10: 0000200000027400 R11: 0000000000000246 R12: 0000200000027440
R13: 00007f9d2a9cdea0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x519/0x520 fs/jfs/jfs_dmap.c:3070
Code: e9 4e ff ff ff e8 37 7c 56 fe 48 c7 c7 20 d1 cd 8b 48 c7 c6 60 ce cd 8b ba fe 0b 00 00 48 c7 c1 40 dc cd 8b e8 28 05 b6 fd 90 <0f> 0b 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90005daf5e0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 48baa647998c7f00
RDX: ffffc90017eab000 RSI: 000000000000182b RDI: 000000000000182c
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000bb5e6d R12: 0000000000000002
R13: 0000000000000055 R14: 0000000000000058 R15: 0000000000000155
FS:  00007f9d2a9ce6c0(0000) GS:ffff888124824000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6f4a7ae000 CR3: 000000006324a000 CR4: 00000000003526f0