BUG at fs/jfs/jfs_dmap.c:3104 assert(bitno < 32)
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kernel BUG at fs/jfs/jfs_dmap.c:3104!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4767 Comm: syz.4.88 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:dbFindBits+0x193/0x1a0 fs/jfs/jfs_dmap.c:3104
Code: 03 34 e2 06 0f 0b e8 6c e4 a9 fe 48 c7 c7 00 29 62 8a 48 c7 c6 80 26 62 8a ba 20 0c 00 00 48 c7 c1 20 31 62 8a e8 dd 33 e2 06 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 55 41 57 41 56 41 55 41 54
RSP: 0018:ffffc900034ff5e8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: d1115a0d650f8700
RDX: ffffc90004806000 RSI: 0000000000018441 RDI: 0000000000018442
RBP: 00000000ffffffff R08: ffff8880b9133d7f R09: 1ffff110172267af
R10: dffffc0000000000 R11: ffffed10172267b0 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f5f0795c6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32423ffc CR3: 000000001fe66000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dbAllocDmapLev+0x169/0x3c0 fs/jfs/jfs_dmap.c:2053
 dbAllocCtl+0x148/0x9b0 fs/jfs/jfs_dmap.c:1893
 dbAllocAG+0x1e7/0xfe0 fs/jfs/jfs_dmap.c:1421
 dbAlloc+0x5a6/0xba0 fs/jfs/jfs_dmap.c:877
 dtSplitUp fs/jfs/jfs_dtree.c:982 [inline]
 dtInsert+0xaf5/0x5830 fs/jfs/jfs_dtree.c:871
 jfs_link+0x36a/0x650 fs/jfs/namei.c:825
 vfs_link+0x615/0x7c0 fs/namei.c:4565
 do_linkat+0x285/0x860 fs/namei.c:4636
 __do_sys_link fs/namei.c:4670 [inline]
 __se_sys_link fs/namei.c:4668 [inline]
 __x64_sys_link+0x82/0x90 fs/namei.c:4668
 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: 0033:0x7f5f09701f79
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:00007f5f0795c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007f5f0997bfa0 RCX: 00007f5f09701f79
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000200000000940
RBP: 00007f5f097987e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f0997c038 R14: 00007f5f0997bfa0 R15: 00007ffd45509078
 </TASK>
Modules linked in:
---[ end trace f37c586558f500e9 ]---
RIP: 0010:dbFindBits+0x193/0x1a0 fs/jfs/jfs_dmap.c:3104
Code: 03 34 e2 06 0f 0b e8 6c e4 a9 fe 48 c7 c7 00 29 62 8a 48 c7 c6 80 26 62 8a ba 20 0c 00 00 48 c7 c1 20 31 62 8a e8 dd 33 e2 06 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 55 41 57 41 56 41 55 41 54
RSP: 0018:ffffc900034ff5e8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: d1115a0d650f8700
RDX: ffffc90004806000 RSI: 0000000000018441 RDI: 0000000000018442
RBP: 00000000ffffffff R08: ffff8880b9133d7f R09: 1ffff110172267af
R10: dffffc0000000000 R11: ffffed10172267b0 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f5f0795c6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f11b3081198 CR3: 000000001fe66000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400