loop0: detected capacity change from 0 to 32768
UFO tlock:0xffffc900010ce288
BUG at fs/jfs/jfs_txnmgr.c:663 assert(last)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:663!
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 04/01/2014
RIP: 0010:txLock+0x1b92/0x1cc0 fs/jfs/jfs_txnmgr.c:663
Code: e9 6a f8 ff ff e8 4e a6 61 fe 48 c7 c7 60 1f 0c 8c 48 c7 c6 59 1b 0c 8c ba 97 02 00 00 48 c7 c1 80 20 0c 8c e8 bf 7f c3 fd 90 <0f> 0b e8 27 a6 61 fe 48 c7 c7 40 21 0c 8c e8 ab 7f c3 fd 48 c7 c7
RSP: 0018:ffffc90004bbde00 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: e5cf7fe8545cee00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90004bbdf28 R08: ffffc90004bbdb87 R09: 1ffff92000977b70
R10: dffffc0000000000 R11: fffff52000977b71 R12: 1ffff92000219c00
R13: ffffc900010ce000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f5026a6c6c0(0000) GS:ffff88808c87c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f23b2742000 CR3: 00000000128ca000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 diWrite+0x444/0x1f40 fs/jfs/jfs_imap.c:654
 txCommit+0x869/0x5410 fs/jfs/jfs_txnmgr.c:1257
 jfs_commit_inode+0x2ef/0x530 fs/jfs/inode.c:114
 extAlloc+0xc95/0x1020 fs/jfs/jfs_extent.c:177
 jfs_get_block+0x358/0xad0 fs/jfs/inode.c:254
 __block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2042
 block_write_begin+0x8d/0x120 fs/buffer.c:2153
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4325
 generic_file_write_iter+0x14a/0x680 mm/filemap.c:4468
 __kernel_write_iter+0x41e/0x880 fs/read_write.c:621
 dump_emit_page fs/coredump.c:1304 [inline]
 dump_user_range+0xc19/0x12c0 fs/coredump.c:1378
 elf_core_dump+0x34c2/0x3ad0 fs/binfmt_elf.c:2109
 coredump_write+0x1216/0x1910 fs/coredump.c:1053
 do_coredump fs/coredump.c:1132 [inline]
 vfs_coredump+0x3807/0x4530 fs/coredump.c:1206
 get_signal+0x1107/0x1330 kernel/signal.c:3022
 arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x8c/0x4d0 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5025b9ce59
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:00007f5026a6c0a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 00000000000000ca RBX: 00007f5025e15fa8 RCX: 00007f5025b9ce59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f5025e15fac
RBP: 00007f5025e15fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5025e16038 R14: 00007ffff250c7d0 R15: 00007ffff250c8b8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txLock+0x1b92/0x1cc0 fs/jfs/jfs_txnmgr.c:663
Code: e9 6a f8 ff ff e8 4e a6 61 fe 48 c7 c7 60 1f 0c 8c 48 c7 c6 59 1b 0c 8c ba 97 02 00 00 48 c7 c1 80 20 0c 8c e8 bf 7f c3 fd 90 <0f> 0b e8 27 a6 61 fe 48 c7 c7 40 21 0c 8c e8 ab 7f c3 fd 48 c7 c7
RSP: 0018:ffffc90004bbde00 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: e5cf7fe8545cee00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90004bbdf28 R08: ffffc90004bbdb87 R09: 1ffff92000977b70
R10: dffffc0000000000 R11: fffff52000977b71 R12: 1ffff92000219c00
R13: ffffc900010ce000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f5026a6c6c0(0000) GS:ffff88808c87c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffff011340 CR3: 00000000128ca000 CR4: 0000000000352ef0