loop0: detected capacity change from 0 to 32768
 ... Log Wrap ... Log Wrap ... Log Wrap ...
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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: 5322 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: e2 fd 90 0f 0b e8 82 8d 7a fe 48 c7 c7 c0 7d a4 8b 48 c7 c6 00 7b a4 8b ba dc 0b 00 00 48 c7 c1 a0 85 a4 8b e8 13 09 e2 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:ffffc9000d35ef90 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000004 RCX: 2d9b643042bf8800
RDX: ffffc9000dd3a000 RSI: 00000000000d72de RDI: 00000000000d72df
RBP: 00000000ffffffff R08: ffffc9000d35eca7 R09: 1ffff92001a6bd94
R10: dffffc0000000000 R11: fffff52001a6bd95 R12: 0000000000000010
R13: 0000000000000000 R14: 0000000000000010 R15: 0000000000000020
FS:  00007f98f69f16c0(0000) GS:ffff88808d732000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f65d8f909c0 CR3: 0000000042553000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dbAllocNear+0x244/0x3d0 fs/jfs/jfs_dmap.c:1243
 dbAlloc+0x933/0xba0 fs/jfs/jfs_dmap.c:832
 extBalloc fs/jfs/jfs_extent.c:336 [inline]
 extAlloc+0x54a/0xfb0 fs/jfs/jfs_extent.c:127
 jfs_get_block+0x346/0xab0 fs/jfs/inode.c:254
 get_more_blocks fs/direct-io.c:648 [inline]
 do_direct_IO fs/direct-io.c:936 [inline]
 __blockdev_direct_IO+0x16ff/0x3490 fs/direct-io.c:1243
 blockdev_direct_IO include/linux/fs.h:3509 [inline]
 jfs_direct_IO+0x119/0x220 fs/jfs/inode.c:339
 generic_file_direct_write+0x1db/0x3e0 mm/filemap.c:4176
 __generic_file_write_iter+0x11d/0x230 mm/filemap.c:4345
 generic_file_write_iter+0x117/0x550 mm/filemap.c:4385
 do_iter_readv_writev+0x623/0x8c0 fs/read_write.c:-1
 vfs_writev+0x31a/0x960 fs/read_write.c:1057
 do_pwritev fs/read_write.c:1153 [inline]
 __do_sys_pwritev2 fs/read_write.c:1211 [inline]
 __se_sys_pwritev2+0x179/0x290 fs/read_write.c:1202
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f98f5b8f6c9
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:00007f98f69f1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f98f5de5fa0 RCX: 00007f98f5b8f6c9
RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000006
RBP: 00007f98f5c11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000007800 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f98f5de6038 R14: 00007f98f5de5fa0 R15: 00007ffdd19c7a88
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3036
Code: e2 fd 90 0f 0b e8 82 8d 7a fe 48 c7 c7 c0 7d a4 8b 48 c7 c6 00 7b a4 8b ba dc 0b 00 00 48 c7 c1 a0 85 a4 8b e8 13 09 e2 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:ffffc9000d35ef90 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000004 RCX: 2d9b643042bf8800
RDX: ffffc9000dd3a000 RSI: 00000000000d72de RDI: 00000000000d72df
RBP: 00000000ffffffff R08: ffffc9000d35eca7 R09: 1ffff92001a6bd94
R10: dffffc0000000000 R11: fffff52001a6bd95 R12: 0000000000000010
R13: 0000000000000000 R14: 0000000000000010 R15: 0000000000000020
FS:  00007f98f69f16c0(0000) GS:ffff88808d732000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f65d8f909c0 CR3: 0000000042553000 CR4: 0000000000352ef0