linux-kernel - Re: [syzbot] [pm?] possible deadlock in rpm

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Message-ID: <20250103104306.1331-1-hdanton@sina.com>
Date: Fri,  3 Jan 2025 18:43:04 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+361e2c54f7f4bf035391@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [pm?] possible deadlock in rpm_suspend

On Mon, 30 Dec 2024 19:52:22 -0800
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    8155b4ef3466 Add linux-next specific files for 20241220
> git tree:       linux-next
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16491818580000

#syz test

--- x/kernel/workqueue.c
+++ y/kernel/workqueue.c
@@ -7807,7 +7807,7 @@ void __init workqueue_init_early(void)
 
 	system_wq = alloc_workqueue("events", 0, 0);
 	system_highpri_wq = alloc_workqueue("events_highpri", WQ_HIGHPRI, 0);
-	system_long_wq = alloc_workqueue("events_long", 0, 0);
+	system_long_wq = alloc_workqueue("events_long", WQ_MEM_RECLAIM, 0);
 	system_unbound_wq = alloc_workqueue("events_unbound", WQ_UNBOUND,
 					    WQ_MAX_ACTIVE);
 	system_freezable_wq = alloc_workqueue("events_freezable",
--