BUG at fs/jfs/jfs_dmap.c:3123 assert(bitno < 32)
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kernel BUG at fs/jfs/jfs_dmap.c:3123!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5358 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3123
Code: a8 fd 90 0f 0b e8 22 96 49 fe 48 c7 c7 20 9b 6e 8c 48 c7 c6 60 98 6e 8c ba 33 0c 00 00 48 c7 c1 60 a3 6e 8c e8 a3 26 a8 fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41
RSP: 0018:ffffc9000f96f578 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 0416d688b8d6c400
RDX: ffffc90020802000 RSI: 0000000000000e4f RDI: 0000000000000e50
RBP: 00000000ffffffff R08: ffffffff9014c6ab R09: 1ffffffff20298d5
R10: dffffc0000000000 R11: fffffbfff20298d6 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f5fb79ad6c0(0000) GS:ffff88808a9f9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6a9bac0980 CR3: 00000000458aa000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x161/0x3b0 fs/jfs/jfs_dmap.c:2072
 dbAllocCtl+0x145/0x990 fs/jfs/jfs_dmap.c:1912
 dbAllocAG+0x1f4/0xf80 fs/jfs/jfs_dmap.c:1440
 dbAlloc+0x5ab/0xba0 fs/jfs/jfs_dmap.c:964
 dtSplitUp fs/jfs/jfs_dtree.c:979 [inline]
 dtInsert+0xb31/0x5cb0 fs/jfs/jfs_dtree.c:868
 jfs_mkdir+0x764/0xaf0 fs/jfs/namei.c:271
 vfs_mkdir+0x411/0x660 fs/namei.c:5428
 filename_mkdirat+0x284/0x550 fs/namei.c:5461
 __do_sys_mkdirat fs/namei.c:5482 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5479
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5fb6ba7d87
Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 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:00007f5fb79ace18 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f5fb79acea0 RCX: 00007f5fb6ba7d87
RDX: 00000000000001ff RSI: 00002000000071c0 RDI: 00000000ffffff9c
RBP: 0000200000007180 R08: 0000200000007240 R09: 0000000000000000
R10: 0000200000007180 R11: 0000000000000246 R12: 00002000000071c0
R13: 00007f5fb79ace60 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3123
Code: a8 fd 90 0f 0b e8 22 96 49 fe 48 c7 c7 20 9b 6e 8c 48 c7 c6 60 98 6e 8c ba 33 0c 00 00 48 c7 c1 60 a3 6e 8c e8 a3 26 a8 fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41
RSP: 0018:ffffc9000f96f578 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 0416d688b8d6c400
RDX: ffffc90020802000 RSI: 0000000000000e4f RDI: 0000000000000e50
RBP: 00000000ffffffff R08: ffffffff9014c6ab R09: 1ffffffff20298d5
R10: dffffc0000000000 R11: fffffbfff20298d6 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f5fb79ad6c0(0000) GS:ffff88808a9f9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6a9bab6d00 CR3: 00000000458aa000 CR4: 0000000000352ef0