Re: [patch] drivers/char/esp.c: fix bootup lockup

From: Jiri Slaby
Date: Sun Mar 09 2008 - 09:41:24 EST


On 03/07/2008 11:08 AM, Ingo Molnar wrote:
randconfig testing found a bootup lockup in drivers/char/esp.c - find the fix below. Not sure why it became more prominent in 2.6.25-rc4, the bug seems rather old and i've been doing allyesconfig bootups for ages with CONFIG_ESP enabled.

------------->
Subject: drivers/char/esp.c: fix bootup lockup
From: Ingo Molnar <mingo@xxxxxxx>
Date: Fri Mar 07 10:47:43 CET 2008

fix this bootup lockup:

PM: Adding info for No Bus:ttyP63
ttyP32 at 0x0240 (irq = 0) is an ESP primary port
BUG: spinlock lockup on CPU#0, swapper/1, f56dd004
Pid: 1, comm: swapper Not tainted 2.6.25-rc4-sched-devel.git-x86-latest.git #402 [<c03ac6f4>] _raw_spin_lock+0x134/0x140
[<c08649be>] _spin_lock_irqsave+0x5e/0x80
[<c0b9fbfe>] ? espserial_init+0x2be/0x6e0
[<c0b9fbfe>] espserial_init+0x2be/0x6e0
[<c0b877a3>] kernel_init+0x83/0x260
[<c0b9f940>] ? espserial_init+0x0/0x6e0
[<c010416a>] ? restore_nocheck_notrace+0x0/0xe
[<c0b87720>] ? kernel_init+0x0/0x260
[<c0b87720>] ? kernel_init+0x0/0x260
[<c0104507>] kernel_thread_helper+0x7/0x10
=======================

kzalloc() is not the way to initialize spinlocks anymore.

Good catch, thanks.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/