loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:3108 assert(nb <= DBWORD)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3108!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5327 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+0x177/0x1a0 fs/jfs/jfs_dmap.c:3108
Code: e9 20 ff ff ff e8 59 3e 65 fe 48 c7 c7 20 cf 0b 8c 48 c7 c6 60 cc 0b 8c ba 24 0c 00 00 48 c7 c1 40 d7 0b 8c e8 aa 1a c7 fd 90 <0f> 0b e8 32 3e 65 fe 48 c7 c7 20 cf 0b 8c 48 c7 c6 60 cc 0b 8c ba
RSP: 0018:ffffc9000debfac8 EFLAGS: 00010246
RAX: 0000000000000032 RBX: 000000000000000a RCX: 6170180f76e28e00
RDX: ffffc9000eefa000 RSI: 0000000000000ca7 RDI: 0000000000000ca8
RBP: 00000000ffffffff R08: ffffc9000debf847 R09: 1ffff92001bd7f08
R10: dffffc0000000000 R11: fffff52001bd7f09 R12: 0000000000000000
R13: 000000000000000a R14: 0000000000000400 R15: ffff888044966000
FS:  00007f1d39b3b6c0(0000) GS:ffff88808c881000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d39b39f68 CR3: 000000000e4b9000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x16b/0x3c0 fs/jfs/jfs_dmap.c:2072
 dbAllocCtl+0x14a/0x9c0 fs/jfs/jfs_dmap.c:1912
 dbAllocAG+0x1e6/0xf80 fs/jfs/jfs_dmap.c:1440
 dbDiscardAG+0x2da/0x8f0 fs/jfs/jfs_dmap.c:1695
 jfs_ioc_trim+0x429/0x690 fs/jfs/jfs_discard.c:106
 jfs_ioctl+0x28e/0x3b0 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1d38b9cdd9
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:00007f1d39b3afe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1d38e15fa0 RCX: 00007f1d38b9cdd9
RDX: 0000200000000080 RSI: 00000000c0185879 RDI: 000000000000000a
RBP: 00007f1d38c32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1d38e16038 R14: 00007f1d38e15fa0 R15: 00007fffc0a5f018
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindBits+0x177/0x1a0 fs/jfs/jfs_dmap.c:3108
Code: e9 20 ff ff ff e8 59 3e 65 fe 48 c7 c7 20 cf 0b 8c 48 c7 c6 60 cc 0b 8c ba 24 0c 00 00 48 c7 c1 40 d7 0b 8c e8 aa 1a c7 fd 90 <0f> 0b e8 32 3e 65 fe 48 c7 c7 20 cf 0b 8c 48 c7 c6 60 cc 0b 8c ba
RSP: 0018:ffffc9000debfac8 EFLAGS: 00010246
RAX: 0000000000000032 RBX: 000000000000000a RCX: 6170180f76e28e00
RDX: ffffc9000eefa000 RSI: 0000000000000ca7 RDI: 0000000000000ca8
RBP: 00000000ffffffff R08: ffffc9000debf847 R09: 1ffff92001bd7f08
R10: dffffc0000000000 R11: fffff52001bd7f09 R12: 0000000000000000
R13: 000000000000000a R14: 0000000000000400 R15: ffff888044966000
FS:  00007f1d39b3b6c0(0000) GS:ffff88808c881000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d39b39f68 CR3: 000000000e4b9000 CR4: 0000000000352ef0