From: William Lee Irwin III <wli@holomorphy.com>
To: Andrew Morton <akpm@zip.com.au>, linux-kernel@vger.kernel.org
Subject: Re: [BUG] __write_lock_failed() oops
Date: Thu, 5 Sep 2002 01:45:02 -0700 [thread overview]
Message-ID: <20020905084502.GD888@holomorphy.com> (raw)
In-Reply-To: <20020905083240.GC888@holomorphy.com>
On Thu, Sep 05, 2002 at 01:42:52AM -0700, Andrew Morton wrote:
>> That's all the assembly hacks in the rwlock code not having proper
>> stack frames. You may have to ksymoops it.
>> At a guess: use-after-free bug against an address_space. You may
>> be able to catch it with slab poisoning.
On Thu, Sep 05, 2002 at 01:32:40AM -0700, William Lee Irwin III wrote:
> (gdb) p/x $eax
> $25 = 0xc0331ca0
> (gdb) p &tasklist_lock
> $27 = (rwlock_t *) 0xc0331ca0
The NMI oopser is going here as well (nmi_watchdog=2 for extra safety)
so I suspect the tasklist_lock semantics are behaving badly. But it's
not easily reproducible enough to test a quick attempt at a fix if it
can't be recognized a priori.
This is literally so difficult to reproduce it hasn't been seen in 2
releases. kgdb is still going and dhowells is helping me fish stuff
off the stack.
Cheers,
Bill
next prev parent reply other threads:[~2002-09-05 8:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-05 8:03 [BUG] __write_lock_failed() oops William Lee Irwin III
2002-09-05 8:42 ` Andrew Morton
2002-09-05 8:32 ` William Lee Irwin III
2002-09-05 8:45 ` William Lee Irwin III [this message]
2002-09-05 8:59 ` William Lee Irwin III
2002-09-05 9:08 ` William Lee Irwin III
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