linux-kernel - Re: [syzbot] [kernfs?] INFO: task hung in do

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Message-Id: <20241101111614.2670-1-hdanton@sina.com>
Date: Fri,  1 Nov 2024 19:16:14 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+a8cdfe2d8ad35db3a7fd@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernfs?] INFO: task hung in do_coredump (3)

On Mon, 28 Oct 2024 15:23:20 -0700
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    819837584309 Linux 6.12-rc5
> git tree:       upstream
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=171b4687980000

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/ mm-hotfixes-unstable

--- x/fs/coredump.c
+++ y/fs/coredump.c
@@ -416,7 +416,7 @@ static int coredump_wait(int exit_code,
 		struct core_thread *ptr;
 
 		wait_for_completion_state(&core_state->startup,
-					  TASK_UNINTERRUPTIBLE|TASK_FREEZABLE);
+					  TASK_IDLE|TASK_FREEZABLE);
 		/*
 		 * Wait for all the threads to become inactive, so that
 		 * all the thread context (extended register state, like
--