linux-kernel - Re: [syzbot] [nilfs?] WARNING: ODEBUG bug in nilfs_detach_log

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Message-ID: <tencent_1D087BFE6C682D456CDC95E8E8EEECF6CD0A@qq.com>
Date: Tue, 28 Oct 2025 13:16:17 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+24d8b70f039151f65590@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [nilfs?] WARNING: ODEBUG bug in nilfs_detach_log_writer (2)

#syz test

diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index f15ca6fc400d..8a17ae49bc41 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -2768,7 +2768,9 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
 
 	if (sci->sc_task) {
 		wake_up(&sci->sc_wait_daemon);
-		kthread_stop(sci->sc_task);
+		printk("kthread start to stop (sci %p)sctask %p, %s\n", sci, sci->sc_task, __func__);
+		int ret = kthread_stop(sci->sc_task);
+		printk("kthread stopped (sci %p)sctask %p thread return %d, %s\n", sci, sci->sc_task, ret, __func__);
 	}
 
 	spin_lock(&sci->sc_state_lock);
@@ -2808,6 +2810,10 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
 
 	down_write(&nilfs->ns_segctor_sem);
 
+	if (sci->sc_task) {
+		printk("sci %p sctask %p %s\n", sci, sci->sc_task, __func__);
+		//timer_shutdown_sync(&sci->sc_timer);
+	}
 	kfree(sci);
 }