loop0: detected capacity change from 0 to 32768
UFO tlock:0xffffc9000154d1b0
BUG at fs/jfs/jfs_txnmgr.c:662 assert(last)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:662!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5319 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~bpo12+1 04/01/2014
RIP: 0010:txLock+0x1b79/0x1cb0 fs/jfs/jfs_txnmgr.c:662
Code: e9 6a f8 ff ff e8 a7 e4 76 fe 48 c7 c7 60 bf a4 8b 48 c7 c6 59 bb a4 8b ba 96 02 00 00 48 c7 c1 60 c0 a4 8b e8 18 63 de fd 90 <0f> 0b e8 80 e4 76 fe 48 c7 c7 20 c1 a4 8b e8 04 63 de fd 48 c7 c7
RSP: 0018:ffffc9000d4b5fa0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 4245cc3b2827fc00
RDX: ffffc9000df8a000 RSI: 0000000000077c23 RDI: 0000000000077c24
RBP: ffffc9000d4b60c8 R08: ffffc9000d4b5cc7 R09: 1ffff92001a96b98
R10: dffffc0000000000 R11: fffff52001a96b99 R12: 1ffff920002a9a00
R13: ffffc9000154d000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f6f14ec26c0(0000) GS:ffff88808d72d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76619909c0 CR3: 000000001255f000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 diWrite+0x444/0x1f40 fs/jfs/jfs_imap.c:654
 txCommit+0x852/0x5430 fs/jfs/jfs_txnmgr.c:1256
 jfs_commit_inode+0x2ef/0x530 fs/jfs/inode.c:114
 extAlloc+0xc3b/0xfb0 fs/jfs/jfs_extent.c:177
 jfs_get_block+0x346/0xab0 fs/jfs/inode.c:254
 __block_write_begin_int+0x6b5/0x1900 fs/buffer.c:2145
 block_write_begin+0x8a/0x120 fs/buffer.c:2256
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2c5/0x900 mm/filemap.c:4255
 generic_file_write_iter+0x117/0x550 mm/filemap.c:4398
 __kernel_write_iter+0x428/0x910 fs/read_write.c:619
 dump_emit_page fs/coredump.c:1298 [inline]
 dump_user_range+0x8a0/0xc90 fs/coredump.c:1372
 elf_core_dump+0x3369/0x3960 fs/binfmt_elf.c:2111
 coredump_write+0x116c/0x1900 fs/coredump.c:1049
 vfs_coredump+0x1db5/0x2a60 fs/coredump.c:1170
 get_signal+0x1108/0x1340 kernel/signal.c:3019
 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:40 [inline]
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 irqentry_exit_to_user_mode+0x7e/0x110 kernel/entry/common.c:73
 exc_page_fault+0xab/0x100 arch/x86/mm/fault.c:1535
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f6f13f68378
Code: 1f 84 00 00 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 90 89 f8 62 a1 fd 00 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 38 01 00 00 <62> f3 7d 20 3f 07 00 c5 fb 93 c0 85 c0 74 59 f3 0f bc c0 c3 0f 1f
RSP: 002b:00007f6f14ec1e68 EFLAGS: 00010283
RAX: 0000000000000000 RBX: 00007f6f14ec1ef0 RCX: 0000000000000000
RDX: 00000000000001ff RSI: 0000200000000240 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000200000000240 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000240
R13: 00007f6f14ec1eb0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txLock+0x1b79/0x1cb0 fs/jfs/jfs_txnmgr.c:662
Code: e9 6a f8 ff ff e8 a7 e4 76 fe 48 c7 c7 60 bf a4 8b 48 c7 c6 59 bb a4 8b ba 96 02 00 00 48 c7 c1 60 c0 a4 8b e8 18 63 de fd 90 <0f> 0b e8 80 e4 76 fe 48 c7 c7 20 c1 a4 8b e8 04 63 de fd 48 c7 c7
RSP: 0018:ffffc9000d4b5fa0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 4245cc3b2827fc00
RDX: ffffc9000df8a000 RSI: 0000000000077c23 RDI: 0000000000077c24
RBP: ffffc9000d4b60c8 R08: ffffc9000d4b5cc7 R09: 1ffff92001a96b98
R10: dffffc0000000000 R11: fffff52001a96b99 R12: 1ffff920002a9a00
R13: ffffc9000154d000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f6f14ec26c0(0000) GS:ffff88808d72d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76619909c0 CR3: 000000001255f000 CR4: 0000000000352ef0