* getcwd() rcu locking bug.
@ 2013-11-13 17:47 Dave Jones
2013-11-13 18:02 ` Dave Jones
0 siblings, 1 reply; 3+ messages in thread
From: Dave Jones @ 2013-11-13 17:47 UTC (permalink / raw)
To: Al Viro; +Cc: Linux Kernel
My fuzzer just hit this on v3.12-7033-g42a2d923cc34
=====================================
[ BUG: bad unlock balance detected! ]
3.12.0+ #2 Not tainted
-------------------------------------
trinity-child1/11681 is trying to release lock (rcu_read_lock) at:
[<ffffffff811d287c>] SyS_getcwd+0x11c/0x300
but there are no more locks to release!
other info that might help us debug this:
no locks held by trinity-child1/11681.
stack backtrace:
CPU: 1 PID: 11681 Comm: trinity-child1 Not tainted 3.12.0+ #2
ffffffff81c480a0 ffff88009a40fea0 ffffffff8171b3dc ffff8802399b1560
ffff88009a40fec8 ffffffff810d370e ffff8802399b1560 ffffffff81c480a0
ffffffff811d287c ffff88009a40ff00 ffffffff810d80fe ffff88023d2d4600
Call Trace:
[<ffffffff8171b3dc>] dump_stack+0x4e/0x7a
[<ffffffff810d370e>] print_unlock_imbalance_bug+0xee/0x100
[<ffffffff811d287c>] ? SyS_getcwd+0x11c/0x300
[<ffffffff810d80fe>] lock_release+0x25e/0x310
[<ffffffff811d2894>] SyS_getcwd+0x134/0x300
[<ffffffff811d2799>] ? SyS_getcwd+0x39/0x300
[<ffffffff8172e064>] tracesys+0xdd/0xe2
------------[ cut here ]------------
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: getcwd() rcu locking bug.
2013-11-13 17:47 getcwd() rcu locking bug Dave Jones
@ 2013-11-13 18:02 ` Dave Jones
2013-11-13 18:12 ` Al Viro
0 siblings, 1 reply; 3+ messages in thread
From: Dave Jones @ 2013-11-13 18:02 UTC (permalink / raw)
To: Al Viro, Linux Kernel, Linus Torvalds
On Wed, Nov 13, 2013 at 12:47:06PM -0500, Dave Jones wrote:
> My fuzzer just hit this on v3.12-7033-g42a2d923cc34
>
> =====================================
> [ BUG: bad unlock balance detected! ]
> 3.12.0+ #2 Not tainted
> -------------------------------------
> trinity-child1/11681 is trying to release lock (rcu_read_lock) at:
> [<ffffffff811d287c>] SyS_getcwd+0x11c/0x300
> but there are no more locks to release!
>
> other info that might help us debug this:
> no locks held by trinity-child1/11681.
>
> stack backtrace:
> CPU: 1 PID: 11681 Comm: trinity-child1 Not tainted 3.12.0+ #2
> ffffffff81c480a0 ffff88009a40fea0 ffffffff8171b3dc ffff8802399b1560
> ffff88009a40fec8 ffffffff810d370e ffff8802399b1560 ffffffff81c480a0
> ffffffff811d287c ffff88009a40ff00 ffffffff810d80fe ffff88023d2d4600
> Call Trace:
> [<ffffffff8171b3dc>] dump_stack+0x4e/0x7a
> [<ffffffff810d370e>] print_unlock_imbalance_bug+0xee/0x100
> [<ffffffff811d287c>] ? SyS_getcwd+0x11c/0x300
> [<ffffffff810d80fe>] lock_release+0x25e/0x310
> [<ffffffff811d2894>] SyS_getcwd+0x134/0x300
> [<ffffffff811d2799>] ? SyS_getcwd+0x39/0x300
> [<ffffffff8172e064>] tracesys+0xdd/0xe2
> ------------[ cut here ]------------
adding Linus, as this might be related to 68f0d9d92e54
Dave
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: getcwd() rcu locking bug.
2013-11-13 18:02 ` Dave Jones
@ 2013-11-13 18:12 ` Al Viro
0 siblings, 0 replies; 3+ messages in thread
From: Al Viro @ 2013-11-13 18:12 UTC (permalink / raw)
To: Dave Jones, Linux Kernel, Linus Torvalds
On Wed, Nov 13, 2013 at 01:02:38PM -0500, Dave Jones wrote:
> On Wed, Nov 13, 2013 at 12:47:06PM -0500, Dave Jones wrote:
> > My fuzzer just hit this on v3.12-7033-g42a2d923cc34
> >
> > =====================================
> > [ BUG: bad unlock balance detected! ]
> > 3.12.0+ #2 Not tainted
> > -------------------------------------
> > trinity-child1/11681 is trying to release lock (rcu_read_lock) at:
> > [<ffffffff811d287c>] SyS_getcwd+0x11c/0x300
> > but there are no more locks to release!
> >
> > other info that might help us debug this:
> > no locks held by trinity-child1/11681.
> >
> > stack backtrace:
> > CPU: 1 PID: 11681 Comm: trinity-child1 Not tainted 3.12.0+ #2
> > ffffffff81c480a0 ffff88009a40fea0 ffffffff8171b3dc ffff8802399b1560
> > ffff88009a40fec8 ffffffff810d370e ffff8802399b1560 ffffffff81c480a0
> > ffffffff811d287c ffff88009a40ff00 ffffffff810d80fe ffff88023d2d4600
> > Call Trace:
> > [<ffffffff8171b3dc>] dump_stack+0x4e/0x7a
> > [<ffffffff810d370e>] print_unlock_imbalance_bug+0xee/0x100
> > [<ffffffff811d287c>] ? SyS_getcwd+0x11c/0x300
> > [<ffffffff810d80fe>] lock_release+0x25e/0x310
> > [<ffffffff811d2894>] SyS_getcwd+0x134/0x300
> > [<ffffffff811d2799>] ? SyS_getcwd+0x39/0x300
> > [<ffffffff8172e064>] tracesys+0xdd/0xe2
> > ------------[ cut here ]------------
>
> adding Linus, as this might be related to 68f0d9d92e54
Check today's vfs.git#for-linus, should be fixed there.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2013-11-13 17:47 getcwd() rcu locking bug Dave Jones
2013-11-13 18:02 ` Dave Jones
2013-11-13 18:12 ` Al Viro
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