loop0: detected capacity change from 0 to 32768
ERROR: (device loop0): dbAdjCtl: the maximum free buddy is not the old root
ERROR: (device loop0): remounting filesystem as read-only
loop0: detected capacity change from 32768 to 0
Read error 10 at 0x2e2000
read_mapping_page failed!
bread failed!
BUG at fs/jfs/jfs_txnmgr.c:530 assert(tblk->next == 0)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:530!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5321 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:txEnd+0x51f/0x530 fs/jfs/jfs_txnmgr.c:530
Code: e9 cc fe ff ff e8 31 c4 61 fe 48 c7 c7 60 1f 0c 8c 48 c7 c6 59 1b 0c 8c ba 12 02 00 00 48 c7 c1 a0 1f 0c 8c e8 a2 9d c3 fd 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0000:ffffc9000f887ae0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: ffff88800bb29800 RCX: a8fb5fb875311400
RDX: ffffc9000ef1a000 RSI: 00000000000029ac RDI: 00000000000029ad
RBP: ffffc90000e8a102 R08: ffff88801fc247d3 R09: 1ffff11003f848fa
R10: dffffc0000000000 R11: ffffed1003f848fb R12: 1ffff920001d1425
R13: dffffc0000000000 R14: ffffc90000e8a128 R15: 0000000000000033
FS:  00007f9b8acaa6c0(0000) GS:ffff88808c87e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f487e2bfd50 CR3: 00000000394ed000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 jfs_truncate_nolock+0x2b6/0x340 fs/jfs/inode.c:399
 jfs_truncate+0xce/0x140 fs/jfs/inode.c:420
 jfs_setattr+0x4f8/0x760 fs/jfs/file.c:123
 notify_change+0xc1a/0xf40 fs/attr.c:556
 do_truncate+0x1c2/0x250 fs/open.c:68
 do_ftruncate+0x490/0x540 fs/open.c:194
 ksys_ftruncate fs/open.c:206 [inline]
 __do_sys_ftruncate fs/open.c:211 [inline]
 __se_sys_ftruncate fs/open.c:209 [inline]
 __x64_sys_ftruncate+0x8f/0xe0 fs/open.c:209
 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: 0033:0x7f9b89d9ce59
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:00007f9b8aca9fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007f9b8a015fa0 RCX: 00007f9b89d9ce59
RDX: 0000000000000000 RSI: 0000000000010001 RDI: 0000000000000004
RBP: 00007f9b89e32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9b8a016038 R14: 00007f9b8a015fa0 R15: 00007fff14b15ac8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txEnd+0x51f/0x530 fs/jfs/jfs_txnmgr.c:530
Code: e9 cc fe ff ff e8 31 c4 61 fe 48 c7 c7 60 1f 0c 8c 48 c7 c6 59 1b 0c 8c ba 12 02 00 00 48 c7 c1 a0 1f 0c 8c e8 a2 9d c3 fd 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0000:ffffc9000f887ae0 EFLAGS: 00010246
RAX: 0000000000000036 RBX: ffff88800bb29800 RCX: a8fb5fb875311400
RDX: ffffc9000ef1a000 RSI: 00000000000029ac RDI: 00000000000029ad
RBP: ffffc90000e8a102 R08: ffff88801fc247d3 R09: 1ffff11003f848fa
R10: dffffc0000000000 R11: ffffed1003f848fb R12: 1ffff920001d1425
R13: dffffc0000000000 R14: ffffc90000e8a128 R15: 0000000000000033
FS:  00007f9b8acaa6c0(0000) GS:ffff88808c87e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f487e2bfd50 CR3: 00000000394ed000 CR4: 0000000000352ef0