linux-kernel - Re: [syzbot] [fs?] WARNING in rcu_sync

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20241117002605.1398-1-hdanton@sina.com>
Date: Sun, 17 Nov 2024 08:26:05 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+823cd0d24881f21ab9f1@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [fs?] WARNING in rcu_sync_dtor (2)

On Sat, 16 Nov 2024 01:33:34 -0800
> syzbot found the following issue on:
> 
> HEAD commit:    2d5404caa8c7 Linux 6.12-rc7
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12188ce8580000

#syz test

--- x/fs/exfat/super.c
+++ y/fs/exfat/super.c
@@ -46,9 +46,6 @@ static int exfat_sync_fs(struct super_bl
 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
 	int err = 0;
 
-	if (unlikely(exfat_forced_shutdown(sb)))
-		return 0;
-
 	if (!wait)
 		return 0;
 
@@ -189,7 +186,6 @@ int exfat_force_shutdown(struct super_bl
 		set_bit(EXFAT_FLAGS_SHUTDOWN, &sbi->s_exfat_flags);
 		break;
 	case EXFAT_GOING_DOWN_NOSYNC:
-		set_bit(EXFAT_FLAGS_SHUTDOWN, &sbi->s_exfat_flags);
 		break;
 	default:
 		return -EINVAL;
--