loop3: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:2983 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2983!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5999 Comm: syz.3.37 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:dbFindLeaf+0x517/0x520 fs/jfs/jfs_dmap.c:2983
Code: fe e9 51 ff ff ff e8 68 ea 87 fe 48 c7 c7 a0 cd e3 8a 48 c7 c6 e0 ca e3 8a ba a7 0b 00 00 48 c7 c1 80 d8 e3 8a e8 e9 84 5e 07 <0f> 0b 0f 1f 80 00 00 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec
RSP: 0018:ffffc9000501fac0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: f4d3ea116a8cb500
RDX: ffffc9000d2da000 RSI: 000000000000ec65 RDI: 000000000000ec66
RBP: 0000000000000003 R08: ffffc9000501f7c7 R09: 1ffff92000a03ef8
R10: dffffc0000000000 R11: fffff52000a03ef9 R12: 000000000000000a
R13: 0000000000000008 R14: 0000000000000005 R15: 0000000000000155
FS:  00007f9a5c4696c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9a5c448d58 CR3: 000000002389f000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x61/0x3c0 fs/jfs/jfs_dmap.c:1969
 dbAllocCtl+0x148/0x9b0 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0xc23/0xfe0 fs/jfs/jfs_dmap.c:1472
 dbDiscardAG+0x2ce/0x8f0 fs/jfs/jfs_dmap.c:1608
 jfs_ioc_trim+0x42f/0x660 fs/jfs/jfs_discard.c:105
 jfs_ioctl+0x2b9/0x3d0 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9a5b58f749
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:00007f9a5c469038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9a5b7e5fa0 RCX: 00007f9a5b58f749
RDX: 0000200000000000 RSI: 00000000c0185879 RDI: 0000000000000008
RBP: 00007f9a5b613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9a5b7e6038 R14: 00007f9a5b7e5fa0 R15: 00007fff0f6a2aa8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x517/0x520 fs/jfs/jfs_dmap.c:2983
Code: fe e9 51 ff ff ff e8 68 ea 87 fe 48 c7 c7 a0 cd e3 8a 48 c7 c6 e0 ca e3 8a ba a7 0b 00 00 48 c7 c1 80 d8 e3 8a e8 e9 84 5e 07 <0f> 0b 0f 1f 80 00 00 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec
RSP: 0018:ffffc9000501fac0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: f4d3ea116a8cb500
RDX: ffffc9000d2da000 RSI: 000000000000ec65 RDI: 000000000000ec66
RBP: 0000000000000003 R08: ffffc9000501f7c7 R09: 1ffff92000a03ef8
R10: dffffc0000000000 R11: fffff52000a03ef9 R12: 000000000000000a
R13: 0000000000000008 R14: 0000000000000005 R15: 0000000000000155
FS:  00007f9a5c4696c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffec0000 CR3: 000000002389f000 CR4: 00000000003506f0