linux-kernel - Re: [syzbot] [block?] general protection fault in rtlock_slowlock

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Message-ID: <tencent_86ACA44F17673776A6C75364C3720966E305@qq.com>
Date: Mon, 10 Nov 2025 21:08:59 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+08df3e4c9b304b37cb04@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [block?] general protection fault in rtlock_slowlock_locked

#syz test

diff --git a/fs/jfs/jfs_logmgr.c b/fs/jfs/jfs_logmgr.c
index b343c5ea1159..e61a7f02b14d 100644
--- a/fs/jfs/jfs_logmgr.c
+++ b/fs/jfs/jfs_logmgr.c
@@ -1860,6 +1860,7 @@ static void lbmLogShutdown(struct jfs_log * log)
 	lbuf = log->lbuf_free;
 	while (lbuf) {
 		struct lbuf *next = lbuf->l_freelist;
+		lbmIOWait(lbuf, 0);
 		__free_page(lbuf->l_page);
 		kfree(lbuf);
 		lbuf = next;
@@ -2146,10 +2147,9 @@ static int lbmIOWait(struct lbuf * bp, int flag)
 
 	jfs_info("lbmIOWait1: bp:0x%p flag:0x%x:0x%x", bp, bp->l_flag, flag);
 
-	LCACHE_LOCK(flags);		/* disable+lock */
-
 	LCACHE_SLEEP_COND(bp->l_ioevent, (bp->l_flag & lbmDONE), flags);
 
+	LCACHE_LOCK(flags);		/* disable+lock */
 	rc = (bp->l_flag & lbmERROR) ? -EIO : 0;
 
 	if (flag & lbmFREE)