Re: [syzbot] [jffs2] kernel BUG in jffs2_del_ino_cache

[syzbot <syzbot+44664704c1494ad5f7a0@syzkaller.appspotmail.com>]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in jffs2_del_ino_cache

------------[ cut here ]------------
WARNING: fs/jffs2/nodelist.c:462 at jffs2_del_ino_cache+0x247/0x2d0 fs/jffs2/nodelist.c:462, CPU#1: syz-executor.0/5273
Modules linked in:
CPU: 1 UID: 0 PID: 5273 Comm: syz-executor.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:jffs2_del_ino_cache+0x247/0x2d0 fs/jffs2/nodelist.c:462
Code: 3c 24 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 de 15 2d 08 e8 09 b6 a5 fe 49 39 df 75 92 e9 42 ff ff ff e8 fa b5 a5 fe 90 <0f> 0b 90 e9 fe fd ff ff 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 36
RSP: 0018:ffffc900038ffa30 EFLAGS: 00010293
RAX: ffffffff831c1a46 RBX: ffff88802d2b5ec0 RCX: ffff888022e33d80
RDX: 0000000000000000 RSI: ffff88802d2b5ec0 RDI: ffff88802962a000
RBP: 0000000000000006 R08: ffff88802962a363 R09: 1ffff110052c546c
R10: dffffc0000000000 R11: ffffed10052c546d R12: ffff88802d2b5ec0
R13: dffffc0000000000 R14: ffff88802d2b5ee0 R15: ffff88802962a000
FS:  00005555917774c0(0000) GS:ffff888126c4a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000112bbcae0000 CR3: 00000000254bd000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 jffs2_do_clear_inode+0x31e/0x390 fs/jffs2/readinode.c:1443
 evict+0x61e/0xb10 fs/inode.c:841
 dispose_list fs/inode.c:883 [inline]
 evict_inodes+0x75a/0x7f0 fs/inode.c:937
 generic_shutdown_super+0xaa/0x2d0 fs/super.c:632
 kill_mtd_super+0x23/0x70 drivers/mtd/mtdsuper.c:174
 jffs2_kill_sb+0x96/0xb0 fs/jffs2/super.c:350
 deactivate_locked_super+0xbc/0x130 fs/super.c:476
 cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0xed/0x480 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:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f51a706ea17
Code: a2 c7 05 e8 94 11 00 00 00 00 00 eb 96 e8 f1 09 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 d0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc326aece8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f51a70ce3ef RCX: 00007f51a706ea17
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffc326aeda0
RBP: 00007ffc326aeda0 R08: 00007ffc326afda0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc326afe60
R13: 00007f51a70ce3ef R14: 0000000000016f32 R15: 0000000000000003
 </TASK>


Tested on:

commit:         59bd5ae0 Merge tag 'for-v7.1' of git://git.kernel.org/..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=15f48fca580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a8d8f65df2b30ee8
dashboard link: https://syzkaller.appspot.com/bug?extid=44664704c1494ad5f7a0
compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=119624ce580000