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Mon, 04 May 2026 13:51:01 -0700 (PDT) Date: Mon, 04 May 2026 13:51:01 -0700 In-Reply-To: <2956b248-c79f-4eae-8bfc-81178b5899af@dev.snart.me> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69f906b5.050a0220.892e9.00d7.GAE@google.com> Subject: Re: [syzbot] [mm?] [exfat?] [f2fs?] memory leak in __kfree_rcu_sheaf From: syzbot To: dxdt@dev.snart.me, linux-f2fs-devel@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Queue-Id: 0CE158000E X-Rspamd-Server: rspam06 X-Stat-Signature: ajwzdwkhu67kjjykihfe5zrhim6uaei1 X-HE-Tag: 1777927862-662111 X-HE-Meta: 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 b9Y1DSNv 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 VEO2ziDA 66CbFGoRelzb9HyWwXuCWu4z0d75S2vWgTeXmzcwYKJdJ0JOldKPwRh+uUYCJKaR Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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: __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 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