* Re: linux-next: Tree for August 19: CRED: BUG: bad unlock balance detected!
@ 2008-08-19 12:36 Alexander Beregalov
2008-08-19 15:23 ` David Howells
0 siblings, 1 reply; 2+ messages in thread
From: Alexander Beregalov @ 2008-08-19 12:36 UTC (permalink / raw)
To: David Howells; +Cc: linux-next, LKML
[-- Attachment #1: Type: text/plain, Size: 1170 bytes --]
It is sparc64 machine.
Config is attached.
[ 25.742287] [ BUG: bad unlock balance detected! ]
[ 25.750284] -------------------------------------
[ 25.758404] rc/404 is trying to release lock (&p->cred_exec_mutex) at:
[ 25.766716] [<00000000006aff78>] mutex_unlock+0x10/0x20
[ 25.775078] but there are no more locks to release!
[ 25.783548]
[ 25.783554] other info that might help us debug this:
[ 25.800205] no locks held by rc/404.
[ 25.808508]
[ 25.808514] stack backtrace:
[ 25.824764] Call Trace:
[ 25.832652] [0000000000478014] print_unlock_inbalance_bug+0xe8/0xf8
[ 25.840661] [0000000000478340] lock_release+0x98/0x1ac
[ 25.848690] [00000000006afed4] __mutex_unlock_slowpath+0xbc/0x150
[ 25.856664] [00000000006aff78] mutex_unlock+0x10/0x20
[ 25.864780] [00000000004b8460] install_exec_creds+0x1c/0x2c
[ 25.872784] [00000000004f077c] load_elf_binary+0xc98/0x11e4
[ 25.880858] [00000000004b8314] search_binary_handler+0xcc/0x1fc
[ 25.888817] [00000000004e7a18] compat_do_execve+0x178/0x1e4
[ 25.896913] [0000000000441f08] sparc32_execve+0x70/0xbc
[ 25.904811] [0000000000406154] linux_sparc_syscall32+0x34/0x40
[-- Attachment #2: config-0819-cred.gz --]
[-- Type: application/x-gzip, Size: 6609 bytes --]
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: linux-next: Tree for August 19: CRED: BUG: bad unlock balance detected!
2008-08-19 12:36 linux-next: Tree for August 19: CRED: BUG: bad unlock balance detected! Alexander Beregalov
@ 2008-08-19 15:23 ` David Howells
0 siblings, 0 replies; 2+ messages in thread
From: David Howells @ 2008-08-19 15:23 UTC (permalink / raw)
To: Alexander Beregalov; +Cc: dhowells, linux-next, LKML
Alexander Beregalov <a.beregalov@gmail.com> wrote:
> [ 25.742287] [ BUG: bad unlock balance detected! ]
> [ 25.750284] -------------------------------------
> [ 25.758404] rc/404 is trying to release lock (&p->cred_exec_mutex) at:
> [ 25.766716] [<00000000006aff78>] mutex_unlock+0x10/0x20
> [ 25.775078] but there are no more locks to release!
I forgot to lock cred_exec_mutex in compat_do_execve(). I've posted a patch
which should fix this:
Subject: [PATCH] CRED: Take cred_exec_mutex in compat_do_execve() and fix
error handling in do_execve()
David
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2008-08-19 12:36 linux-next: Tree for August 19: CRED: BUG: bad unlock balance detected! Alexander Beregalov
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