BUG at fs/jfs/jfs_dmap.c:3036 assert(bitno < 32)
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kernel BUG at fs/jfs/jfs_dmap.c:3036!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4681 Comm: syz.0.54 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:dbFindBits+0x193/0x1a0 fs/jfs/jfs_dmap.c:3036
Code: a3 a0 1a 07 0f 0b e8 5c 1a 96 fe 48 c7 c7 a0 fa a5 8a 48 c7 c6 20 f8 a5 8a ba dc 0b 00 00 48 c7 c1 e0 02 a6 8a e8 7d a0 1a 07 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 55 41 57 41 56 41 55 41 54
RSP: 0018:ffffc900036275e8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 1e772e9bece3d600
RDX: ffffc90010790000 RSI: 0000000000014494 RDI: 0000000000014495
RBP: 00000000ffffffff R08: dffffc0000000000 R09: fffff520006c4e5d
R10: fffff520006c4e5d R11: 1ffff920006c4e5c R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f7a581846c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8548fb42f8 CR3: 000000001f26d000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dbAllocDmapLev+0x169/0x3c0 fs/jfs/jfs_dmap.c:1985
 dbAllocCtl+0x148/0x9b0 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0x1e7/0xfe0 fs/jfs/jfs_dmap.c:1353
 dbAlloc+0x5a3/0xb90 fs/jfs/jfs_dmap.c:877
 dtSplitUp fs/jfs/jfs_dtree.c:982 [inline]
 dtInsert+0xab2/0x58a0 fs/jfs/jfs_dtree.c:871
 jfs_mkdir+0x6e5/0xa70 fs/jfs/namei.c:270
 vfs_mkdir+0x387/0x570 fs/namei.c:4114
 do_mkdirat+0x1d0/0x430 fs/namei.c:4139
 __do_sys_mkdirat fs/namei.c:4154 [inline]
 __se_sys_mkdirat fs/namei.c:4152 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4152
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7a5738f749
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:00007f7a58184038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f7a575e6180 RCX: 00007f7a5738f749
RDX: 0000000000000000 RSI: 0000200000001dc0 RDI: ffffffffffffff9c
RBP: 00007f7a57413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7a575e6218 R14: 00007f7a575e6180 R15: 00007ffeb7478c08
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x193/0x1a0 fs/jfs/jfs_dmap.c:3036
Code: a3 a0 1a 07 0f 0b e8 5c 1a 96 fe 48 c7 c7 a0 fa a5 8a 48 c7 c6 20 f8 a5 8a ba dc 0b 00 00 48 c7 c1 e0 02 a6 8a e8 7d a0 1a 07 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 55 41 57 41 56 41 55 41 54
RSP: 0018:ffffc900036275e8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 1e772e9bece3d600
RDX: ffffc90010790000 RSI: 0000000000014494 RDI: 0000000000014495
RBP: 00000000ffffffff R08: dffffc0000000000 R09: fffff520006c4e5d
R10: fffff520006c4e5d R11: 1ffff920006c4e5c R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f7a581846c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8549b8cf98 CR3: 000000001f26d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400