loop0: detected capacity change from 0 to 32768
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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: 5328 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:3036
Code: ca fd 90 0f 0b e8 02 ba 68 fe 48 c7 c7 20 3c 0b 8c 48 c7 c6 60 39 0b 8c ba dc 0b 00 00 48 c7 c1 60 44 0b 8c e8 43 c5 ca 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:ffffc9000f8fe9e8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 70e46b71910b4100
RDX: ffffc9000efb2000 RSI: 00000000000ccce2 RDI: 00000000000ccce3
RBP: 00000000ffffffff R08: ffffc9000f8fe767 R09: 1ffff92001f1fcec
R10: dffffc0000000000 R11: fffff52001f1fced R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f6d93ec86c0(0000) GS:ffff88808ca52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb97bd51fb8 CR3: 0000000038f72000 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+0x5ab/0xba0 fs/jfs/jfs_dmap.c:877
 xtSplitUp+0x4ca/0x1fc0 fs/jfs/jfs_xtree.c:760
 xtInsert+0x452/0xf20 fs/jfs/jfs_xtree.c:608
 extAlloc+0xad9/0x1020 fs/jfs/jfs_extent.c:150
 jfs_get_block+0x358/0xad0 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+0x15d7/0x32f0 fs/direct-io.c:1243
 blockdev_direct_IO include/linux/fs.h:3114 [inline]
 jfs_direct_IO+0x119/0x220 fs/jfs/inode.c:339
 generic_file_direct_write+0x1db/0x3e0 mm/filemap.c:4253
 __generic_file_write_iter+0x11d/0x230 mm/filemap.c:4422
 generic_file_write_iter+0x14a/0x680 mm/filemap.c:4462
 do_iter_readv_writev+0x619/0x8c0 fs/read_write.c:-1
 vfs_writev+0x33c/0x990 fs/read_write.c:1059
 do_pwritev fs/read_write.c:1155 [inline]
 __do_sys_pwritev2 fs/read_write.c:1213 [inline]
 __se_sys_pwritev2+0x184/0x2a0 fs/read_write.c:1204
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6d92f9c799
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:00007f6d93ec7fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f6d93215fa0 RCX: 00007f6d92f9c799
RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000004
RBP: 00007f6d93032c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000007800 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6d93216038 R14: 00007f6d93215fa0 R15: 00007fff403cc268
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x19e/0x1a0 fs/jfs/jfs_dmap.c:3036
Code: ca fd 90 0f 0b e8 02 ba 68 fe 48 c7 c7 20 3c 0b 8c 48 c7 c6 60 39 0b 8c ba dc 0b 00 00 48 c7 c1 60 44 0b 8c e8 43 c5 ca 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:ffffc9000f8fe9e8 EFLAGS: 00010246
RAX: 0000000000000030 RBX: 0000000000000000 RCX: 70e46b71910b4100
RDX: ffffc9000efb2000 RSI: 00000000000ccce2 RDI: 00000000000ccce3
RBP: 00000000ffffffff R08: ffffc9000f8fe767 R09: 1ffff92001f1fcec
R10: dffffc0000000000 R11: fffff52001f1fced R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000020
FS:  00007f6d93ec86c0(0000) GS:ffff88808ca52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb97bd51fb8 CR3: 0000000038f72000 CR4: 0000000000352ef0