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a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1706883173; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Ij6oDiAkJUq8zd7Ne/5DNIcQE+6hx5NUe30iVeKaeds=; b=cyugpSWwEO0wfeMAT251N9WbpgpEJDip9egujvXj09IhlEWunJ6JVoKo+N81zbnuwhUZY5 AH14ryU2lrXdm+H0VzjAt7hDlX5Cutphup1qSJA6P1RpZABSfZHCiWI+mpatwaK0UXd1lJ f5LPaOHZ9c1+oiJnmpZReYa5OW4o2qCqCS+LqxwGIhadJLcPSOJkp5MZEXZpO3aIboTbmc uyHL8DqzqbaFd+lUyegACeoNpCvNE+tfkkc5szVnEVMDp1HgFJkUG/psjrVqmLXpih2mEM k91jslZL5mQhlRj47ym8oGJeAxT4NKbSpjz5RHagq2n1Hd+JMvRg5v9n+FIHNg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1706883173; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Ij6oDiAkJUq8zd7Ne/5DNIcQE+6hx5NUe30iVeKaeds=; b=RCALL4gszeocsYD5hgxqbJcFi8DLy4ZkwbKkxcCSJk11jZLxvKMo+lqdZBVPXzPJziCxPJ oXjN9osEQbjUIoAw== To: paulmck@kernel.org, Tejun Heo , Lai Jiangshan , Petr Mladek , Steven Rostedt , Sergey Senozhatsky Cc: Stephen Rothwell , linux-kernel@vger.kernel.org, rcu@vger.kernel.org Subject: Re: [BUG] workqueues and printk not playing nice since next-20240130 In-Reply-To: <410d6a87-bf34-457e-b714-1e6149d48532@paulmck-laptop> References: <410d6a87-bf34-457e-b714-1e6149d48532@paulmck-laptop> Date: Fri, 02 Feb 2024 15:18:48 +0106 Message-ID: <87le83ara7.fsf@jogness.linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On 2024-02-02, "Paul E. McKenney" wrote: > So the system really did boot and is running just fine. It is just that > there is no console output. Details, details! > > Is there anything I can do to some combination of workqueues and printk > to help debug this? The printk ringbuffer contents would certainly be interesting. If you build the GDB scripts (CONFIG_GDB_SCRIPTS) then you will have: (gdb) lx-dmesg As an alternative, you could copy the contents of Documentation/admin-guide/kdump/gdbmacros.txt into your .gdbinit and then will have: (gdb) dmesg There may be some hints in the kernel log as to why there is no console output. John