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SubjectRe: [BUG] __write_lock_failed() oops
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
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