loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:3036 assert(bitno < 32)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3036!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5359 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~bpo12+1 04/01/2014
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3036
Code: e7 fd 90 0f 0b e8 52 55 7f fe 48 c7 c7 c0 f3 e3 8b 48 c7 c6 00 f1 e3 8b ba dc 0b 00 00 48 c7 c1 a0 fb e3 8b e8 33 28 e7 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:ffffc9000d2a7628 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 194bf1a84529ac00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffffc9000d2a7347 R09: 1ffff92001a54e68
R10: dffffc0000000000 R11: fffff52001a54e69 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f7069ff16c0(0000) GS:ffff88808d00a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5aecd909c0 CR3: 0000000042aa3000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x16b/0x3c0 fs/jfs/jfs_dmap.c:1985
 dbAllocCtl+0x14a/0x9c0 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0x1e6/0xff0 fs/jfs/jfs_dmap.c:1353
 dbAlloc+0x5a8/0xba0 fs/jfs/jfs_dmap.c:877
 xtInsert+0x9c8/0xe30 fs/jfs/jfs_xtree.c:582
 jfs_symlink+0x623/0xe60 fs/jfs/namei.c:989
 vfs_symlink+0x143/0x2f0 fs/namei.c:4730
 do_symlinkat+0x1b1/0x3f0 fs/namei.c:4756
 __do_sys_symlinkat fs/namei.c:4772 [inline]
 __se_sys_symlinkat fs/namei.c:4769 [inline]
 __x64_sys_symlinkat+0x95/0xb0 fs/namei.c:4769
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f706918eba9
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:00007f7069ff1038 EFLAGS: 00000246 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 00007f70693d5fa0 RCX: 00007f706918eba9
RDX: 0000200000000340 RSI: 0000000000000009 RDI: 0000200000000440
RBP: 00007f7069211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f70693d6038 R14: 00007f70693d5fa0 R15: 00007ffe9051be28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3036
Code: e7 fd 90 0f 0b e8 52 55 7f fe 48 c7 c7 c0 f3 e3 8b 48 c7 c6 00 f1 e3 8b ba dc 0b 00 00 48 c7 c1 a0 fb e3 8b e8 33 28 e7 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:ffffc9000d2a7628 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 194bf1a84529ac00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffffc9000d2a7347 R09: 1ffff92001a54e68
R10: dffffc0000000000 R11: fffff52001a54e69 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f7069ff16c0(0000) GS:ffff88808d00a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5aecd909c0 CR3: 0000000042aa3000 CR4: 0000000000352ef0