loop0: detected capacity change from 0 to 32768
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: 5344 Comm: syz.0.0 Not tainted 6.16.0-rc3-syzkaller-00057-g92ca6c498a5e #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 23 95 82 fe 48 c7 c7 c0 c4 c3 8b 48 c7 c6 00 c2 c3 8b ba 9f 0b 00 00 48 c7 c1 80 cf c3 8b e8 a4 d6 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:ffffc9000d307aa0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 04689993b3742400
RDX: ffffc9000e122000 RSI: 0000000000000b2e RDI: 0000000000000b2f
RBP: 0000000000000003 R08: ffffc9000d3077c7 R09: 1ffff92001a60ef8
R10: dffffc0000000000 R11: fffff52001a60ef9 R12: 000000000000000a
R13: 0000000000000008 R14: 0000000000000005 R15: 0000000000000155
FS:  00007f492cb796c0(0000) GS:ffff88808d251000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f492cb76f70 CR3: 0000000033514000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dbAllocDmapLev+0x60/0x3c0 fs/jfs/jfs_dmap.c:1961
 dbAllocCtl+0x14a/0x9b0 fs/jfs/jfs_dmap.c:1817
 dbAllocAG+0xba8/0xf10 fs/jfs/jfs_dmap.c:1466
 dbDiscardAG+0x2df/0x900 fs/jfs/jfs_dmap.c:1602
 jfs_ioc_trim+0x429/0x690 fs/jfs/jfs_discard.c:106
 jfs_ioctl+0x2b5/0x3d0 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 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: 0033:0x7f492bd8e929
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:00007f492cb79038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f492bfb5fa0 RCX: 00007f492bd8e929
RDX: 0000200000000080 RSI: 00000000c0185879 RDI: 000000000000000b
RBP: 00007f492be10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f492bfb5fa0 R15: 00007ffd0a353ec8
 </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 23 95 82 fe 48 c7 c7 c0 c4 c3 8b 48 c7 c6 00 c2 c3 8b ba 9f 0b 00 00 48 c7 c1 80 cf c3 8b e8 a4 d6 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:ffffc9000d307aa0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 04689993b3742400
RDX: ffffc9000e122000 RSI: 0000000000000b2e RDI: 0000000000000b2f
RBP: 0000000000000003 R08: ffffc9000d3077c7 R09: 1ffff92001a60ef8
R10: dffffc0000000000 R11: fffff52001a60ef9 R12: 000000000000000a
R13: 0000000000000008 R14: 0000000000000005 R15: 0000000000000155
FS:  00007f492cb796c0(0000) GS:ffff88808d251000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f492cb57fc8 CR3: 0000000033514000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400