list_add corruption. next is NULL.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:28!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 102 Comm: jfsCommit 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:__list_add_valid_or_report+0xc3/0x130 lib/list_debug.c:27
Code: 4c 89 f2 48 89 d9 e8 fc 93 6d fc 90 0f 0b 48 c7 c7 c0 cb 27 8c e8 ed 93 6d fc 90 0f 0b 48 c7 c7 80 cc 27 8c e8 de 93 6d fc 90 <0f> 0b 48 89 df e8 e3 5e 54 fd 42 80 7c 2d 00 00 74 08 4c 89 e7 e8
RSP: 0018:ffffc90000ec7ba8 EFLAGS: 00010046
RAX: 0000000000000022 RBX: 0000000000000000 RCX: 0995c9c9bb5a5900
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: ffff8880003069b0 R08: ffffc90000ec7927 R09: 1ffff920001d8f24
R10: dffffc0000000000 R11: fffff520001d8f25 R12: ffffc90000ec9450
R13: 0000000000000000 R14: ffff888000306a60 R15: ffff8880003069c0
FS:  0000000000000000(0000) GS:ffff88808ca58000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc20b1ff000 CR3: 0000000042cb9000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __list_add_valid include/linux/list.h:96 [inline]
 __list_add include/linux/list.h:158 [inline]
 list_add include/linux/list.h:177 [inline]
 diUpdatePMap+0x636/0xe60 fs/jfs/jfs_imap.c:2831
 txUpdateMap+0x7da/0x9c0 fs/jfs/jfs_txnmgr.c:2357
 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline]
 jfs_lazycommit+0x43d/0xaa0 fs/jfs/jfs_txnmgr.c:2734
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0xc3/0x130 lib/list_debug.c:27
Code: 4c 89 f2 48 89 d9 e8 fc 93 6d fc 90 0f 0b 48 c7 c7 c0 cb 27 8c e8 ed 93 6d fc 90 0f 0b 48 c7 c7 80 cc 27 8c e8 de 93 6d fc 90 <0f> 0b 48 89 df e8 e3 5e 54 fd 42 80 7c 2d 00 00 74 08 4c 89 e7 e8
RSP: 0018:ffffc90000ec7ba8 EFLAGS: 00010046
RAX: 0000000000000022 RBX: 0000000000000000 RCX: 0995c9c9bb5a5900
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: ffff8880003069b0 R08: ffffc90000ec7927 R09: 1ffff920001d8f24
R10: dffffc0000000000 R11: fffff520001d8f25 R12: ffffc90000ec9450
R13: 0000000000000000 R14: ffff888000306a60 R15: ffff8880003069c0
FS:  0000000000000000(0000) GS:ffff88808ca58000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc20b1ff000 CR3: 0000000042cb9000 CR4: 0000000000352ef0