loop3: detected capacity change from 0 to 32768
 ... Log Wrap ... Log Wrap ... Log Wrap ...
BUG at fs/jfs/jfs_dmap.c:3123 assert(bitno < 32)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3123!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 22514 Comm: syz.3.1442 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3123
Code: d2 fd 90 0f 0b e8 e2 91 6f fe 48 c7 c7 e0 2c 8b 8b 48 c7 c6 20 2a 8b 8b ba 33 0c 00 00 48 c7 c1 20 35 8b 8b e8 33 6c d2 fd 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:ffffc90003e17590 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: a293db1bd5860500
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff520007c2e61 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f59a275c6c0(0000) GS:ffff888126273000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7e480c4000 CR3: 00000000391e4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x16b/0x3c0 fs/jfs/jfs_dmap.c:2072
 dbAllocCtl+0x14a/0x9c0 fs/jfs/jfs_dmap.c:1912
 dbAllocAG+0x1e6/0xf80 fs/jfs/jfs_dmap.c:1440
 dbAlloc+0x5ab/0xba0 fs/jfs/jfs_dmap.c:964
 dtSplitUp fs/jfs/jfs_dtree.c:979 [inline]
 dtInsert+0xb27/0x5cd0 fs/jfs/jfs_dtree.c:868
 jfs_mknod+0x6bd/0x9d0 fs/jfs/namei.c:1413
 vfs_mknod+0x44e/0x620 fs/namei.c:5120
 filename_mknodat+0x3cf/0x670 fs/namei.c:-1
 __do_sys_mknod fs/namei.c:5207 [inline]
 __se_sys_mknod+0x3a/0x150 fs/namei.c:5204
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59a454ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f59a275c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007f59a47c6180 RCX: 00007f59a454ce59
RDX: 0000000000000707 RSI: 000000000000c000 RDI: 0000200000000240
RBP: 00007f59a45e2d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f59a47c6218 R14: 00007f59a47c6180 R15: 00007ffedfad25f8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3123
Code: d2 fd 90 0f 0b e8 e2 91 6f fe 48 c7 c7 e0 2c 8b 8b 48 c7 c6 20 2a 8b 8b ba 33 0c 00 00 48 c7 c1 20 35 8b 8b e8 33 6c d2 fd 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:ffffc90003e17590 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: a293db1bd5860500
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff520007c2e61 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f59a275c6c0(0000) GS:ffff888126273000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7e480c4000 CR3: 00000000391e4000 CR4: 00000000003526f0