Re: [syzbot] [mm?] [exfat?] [f2fs?] memory leak in __kfree_rcu_sheaf

[syzbot <syzbot+cae7809e9dc1459e4e63@syzkaller.appspotmail.com>]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel panic: !!! sbi at ADDR used after freeing !!!

F2FS-fs (loop1): f2fs_record_error_work()
Kernel panic - not syncing: !!! sbi at ffff888129322000 used after freeing !!!
CPU: 1 UID: 0 PID: 6598 Comm: kworker/1:5 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events f2fs_record_error_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x97/0xe0 lib/dump_stack.c:120
 vpanic+0x383/0x6d0 kernel/panic.c:650
 panic+0x6e/0x70 kernel/panic.c:787
 f2fs_record_error_work.cold+0x14/0x14 fs/f2fs/super.c:4747
 process_one_work+0x277/0x5b0 kernel/workqueue.c:3302
 process_scheduled_works kernel/workqueue.c:3385 [inline]
 worker_thread+0x255/0x4a0 kernel/workqueue.c:3466
 kthread+0x14e/0x1a0 kernel/kthread.c:436
 ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Kernel Offset: disabled


Tested on:

commit:         6d35786d Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17a63a36580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9645c21cfd1d3e8f
dashboard link: https://syzkaller.appspot.com/bug?extid=cae7809e9dc1459e4e63
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
patch:          https://syzkaller.appspot.com/x/patch.diff?x=172b8ad2580000