loop0: detected capacity change from 0 to 32768
netlink: 32 bytes leftover after parsing attributes in process `syz.0.0'.
ERROR: (device loop0): dbAdjCtl: the maximum free buddy is not the old root

ERROR: (device loop0): remounting filesystem as read-only
read_mapping_page failed!
BUG at fs/jfs/jfs_dmap.c:2787 assert(leaf[leafno] == NOFREE)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2787!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5323 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:dbBackSplit+0x57c/0x580 fs/jfs/jfs_dmap.c:2787
Code: e9 02 fc ff ff e8 34 e7 55 fe 48 c7 c7 e0 f6 4d 8c 48 c7 c6 20 f4 4d 8c ba e3 0a 00 00 48 c7 c1 00 fe 4d 8c e8 65 87 b5 fd 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41
RSP: 0018:ffffc9000f2f7bc0 EFLAGS: 00010246
RAX: 000000000000003c RBX: 000000000000000a RCX: 004dcd51e30b2800
RDX: ffffc90020001000 RSI: 00000000000044f9 RDI: 00000000000044fa
RBP: 0000000000000000 R08: ffff88801fa24713 R09: 1ffff11003f448e2
R10: dffffc0000000000 R11: ffffed1003f448e3 R12: 0000000000000020
R13: ffff888045b10010 R14: ffff888045b10096 R15: ffff888045b10076
FS:  00007f1b327c06c0(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feedc9909c0 CR3: 000000004037d000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dbFreeDmap fs/jfs/jfs_dmap.c:2195 [inline]
 dbFree+0x53f/0x650 fs/jfs/jfs_dmap.c:485
 dbDiscardAG+0x7b5/0x8f0 fs/jfs/jfs_dmap.c:1732
 jfs_ioc_trim+0x436/0x680 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:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1b3199e559
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:00007f1b327bffe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1b31c25fa0 RCX: 00007f1b3199e559
RDX: 00002000000004c0 RSI: 00000000c0185879 RDI: 0000000000000006
RBP: 00007f1b31a358b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1b31c26038 R14: 00007f1b31c25fa0 R15: 00007ffd0c858868
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbBackSplit+0x57c/0x580 fs/jfs/jfs_dmap.c:2787
Code: e9 02 fc ff ff e8 34 e7 55 fe 48 c7 c7 e0 f6 4d 8c 48 c7 c6 20 f4 4d 8c ba e3 0a 00 00 48 c7 c1 00 fe 4d 8c e8 65 87 b5 fd 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41
RSP: 0018:ffffc9000f2f7bc0 EFLAGS: 00010246
RAX: 000000000000003c RBX: 000000000000000a RCX: 004dcd51e30b2800
RDX: ffffc90020001000 RSI: 00000000000044f9 RDI: 00000000000044fa
RBP: 0000000000000000 R08: ffff88801fa24713 R09: 1ffff11003f448e2
R10: dffffc0000000000 R11: ffffed1003f448e3 R12: 0000000000000020
R13: ffff888045b10010 R14: ffff888045b10096 R15: ffff888045b10076
FS:  00007f1b327c06c0(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005570b5cd5168 CR3: 000000004037d000 CR4: 0000000000352ef0