BUG at fs/jfs/jfs_dmap.c:3051 assert(n < 4)
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kernel BUG at fs/jfs/jfs_dmap.c:3051!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7552 Comm: syz.6.812 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:dbFindLeaf+0x517/0x520 fs/jfs/jfs_dmap.c:3051
Code: fe e9 51 ff ff ff e8 48 a1 ad fe 48 c7 c7 40 f3 41 8a 48 c7 c6 c0 f0 41 8a ba eb 0b 00 00 48 c7 c1 40 fe 41 8a e8 09 45 d4 06 <0f> 0b 0f 1f 80 00 00 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec
RSP: 0018:ffffc9000333fab8 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 7cbfb5914b055100
RDX: ffffc90011394000 RSI: 000000000000df6e RDI: 000000000000df6f
RBP: 0000000000000003 R08: dffffc0000000000 R09: ffffed10172067b0
R10: ffffed10172067b0 R11: 1ffff110172067af R12: 000000000000000a
R13: 0000000000000008 R14: 0000000000000005 R15: 0000000000000155
FS:  00007fc9afcf56c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc3327ae198 CR3: 000000006080b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dbAllocDmapLev+0x61/0x3c0 fs/jfs/jfs_dmap.c:2037
 dbAllocCtl+0x148/0x9b0 fs/jfs/jfs_dmap.c:1893
 dbAllocAG+0xc23/0xfe0 fs/jfs/jfs_dmap.c:1540
 dbDiscardAG+0x2ca/0x8e0 fs/jfs/jfs_dmap.c:1676
 jfs_ioc_trim+0x41e/0x680 fs/jfs/jfs_discard.c:106
 jfs_ioctl+0x2a5/0x3a0 fs/jfs/ioctl.c:132
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc9b1acfec9
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:00007fc9afcf5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc9b1d27180 RCX: 00007fc9b1acfec9
RDX: 00002000000004c0 RSI: 00000000c0185879 RDI: 0000000000000008
RBP: 00007fc9b1b52f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc9b1d27218 R14: 00007fc9b1d27180 R15: 00007fff9c3cadb8
 </TASK>
Modules linked in:
---[ end trace ccffc31284094d4a ]---
RIP: 0010:dbFindLeaf+0x517/0x520 fs/jfs/jfs_dmap.c:3051
Code: fe e9 51 ff ff ff e8 48 a1 ad fe 48 c7 c7 40 f3 41 8a 48 c7 c6 c0 f0 41 8a ba eb 0b 00 00 48 c7 c1 40 fe 41 8a e8 09 45 d4 06 <0f> 0b 0f 1f 80 00 00 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec
RSP: 0018:ffffc9000333fab8 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 7cbfb5914b055100
RDX: ffffc90011394000 RSI: 000000000000df6e RDI: 000000000000df6f
RBP: 0000000000000003 R08: dffffc0000000000 R09: ffffed10172067b0
R10: ffffed10172067b0 R11: 1ffff110172067af R12: 000000000000000a
R13: 0000000000000008 R14: 0000000000000005 R15: 0000000000000155
FS:  00007fc9afcf56c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc3327ae198 CR3: 000000006080b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400