* 2.6.36-rc5-mmotm0928 BUG while trying to ptrace a process
@ 2010-10-06 9:32 Valdis.Kletnieks
2010-10-06 13:45 ` Peter Zijlstra
0 siblings, 1 reply; 6+ messages in thread
From: Valdis.Kletnieks @ 2010-10-06 9:32 UTC (permalink / raw)
To: Andrew Morton, Peter Zijlstra, Paul Mackerras, Ingo Molnar,
Arnaldo Carvalho de Melo
Cc: linux-kernel
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Dell Latitude E6500, Intel Core2 Duo P8700 CPU.
Have seen this three times now while trying to attach gdb to a hung Firefox
process.
[20669.480674] BUG: unable to handle kernel NULL pointer dereference at 0000000000000100
[20669.480682] IP: [<ffffffff810b8275>] __reserve_bp_slot+0x56/0x17d
Here's the stack traceback:
[20669.480761] Process gdb (pid: 60320, threadinfo ffff8800a0e4c000, task ffff8800c62acc80)
[20669.480763] Stack:
[20669.480765] ffff8801188c2eac ffffffff81a40750 0000000100000000 ffffffff81a406b0
[20669.480771] <0> ffffffff8100b469 ffff8800a0d6c400 0000000000000000 ffffffff81a406b0
[20669.480777] <0> ffffffff8100b469 0000000000000000 ffff8800a0e4dcf8 ffffffff810b83e5
[20669.480784] Call Trace:
[20669.480789] [<ffffffff8100b469>] ? ptrace_triggered+0x0/0x39
[20669.480793] [<ffffffff8100b469>] ? ptrace_triggered+0x0/0x39
[20669.480797] [<ffffffff810b83e5>] reserve_bp_slot+0x22/0x3b
[20669.480800] [<ffffffff810b6805>] ? perf_init_event+0x0/0xc9
[20669.480804] [<ffffffff810b8487>] register_perf_hw_breakpoint+0x11/0x36
[20669.480808] [<ffffffff810b84cb>] hw_breakpoint_event_init+0x1f/0x34
[20669.480811] [<ffffffff8100b469>] ? ptrace_triggered+0x0/0x39
[20669.480815] [<ffffffff810b685a>] perf_init_event+0x55/0xc9
[20669.480818] [<ffffffff810b6805>] ? perf_init_event+0x0/0xc9
[20669.480822] [<ffffffff810b6a74>] perf_event_alloc+0x1a6/0x3ef
[20669.480826] [<ffffffff810b6f92>] perf_event_create_kernel_counter+0x22/0x185
[20669.480830] [<ffffffff810b7d9b>] register_user_hw_breakpoint+0xf/0x11
[20669.480834] [<ffffffff8100c7d3>] ptrace_set_debugreg+0xaa/0x257
[20669.480838] [<ffffffff8156bfab>] ? sub_preempt_count+0x35/0x48
[20669.480844] [<ffffffff81568957>] ? _raw_spin_unlock_irqrestore+0x72/0x80
[20669.480848] [<ffffffff8100cd48>] arch_ptrace+0x126/0x214
[20669.480852] [<ffffffff81045609>] sys_ptrace+0x7e/0x99
[20669.480857] [<ffffffff810027eb>] system_call_fastpath+0x16/0x1b
Any thoughts? I haven't gotten any further than "the big honking commits
against perf in linux-next". Probably bisectable with some effort - I've got
a fairly replicable Firefox hang that seems to trigger the gdb indigestion.,
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: 2.6.36-rc5-mmotm0928 BUG while trying to ptrace a process
2010-10-06 9:32 2.6.36-rc5-mmotm0928 BUG while trying to ptrace a process Valdis.Kletnieks
@ 2010-10-06 13:45 ` Peter Zijlstra
2010-10-18 1:28 ` KOSAKI Motohiro
0 siblings, 1 reply; 6+ messages in thread
From: Peter Zijlstra @ 2010-10-06 13:45 UTC (permalink / raw)
To: Valdis.Kletnieks
Cc: Andrew Morton, Paul Mackerras, Ingo Molnar,
Arnaldo Carvalho de Melo, linux-kernel, fweisbec
On Wed, 2010-10-06 at 05:32 -0400, Valdis.Kletnieks@vt.edu wrote:
> Dell Latitude E6500, Intel Core2 Duo P8700 CPU.
>
> Have seen this three times now while trying to attach gdb to a hung Firefox
> process.
>
> [20669.480674] BUG: unable to handle kernel NULL pointer dereference at 0000000000000100
> [20669.480682] IP: [<ffffffff810b8275>] __reserve_bp_slot+0x56/0x17d
Known issue I think, Frederic was looking into curing this.
Frederic, what's the current status of that?
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: 2.6.36-rc5-mmotm0928 BUG while trying to ptrace a process
2010-10-06 13:45 ` Peter Zijlstra
@ 2010-10-18 1:28 ` KOSAKI Motohiro
2010-10-18 1:36 ` Frederic Weisbecker
0 siblings, 1 reply; 6+ messages in thread
From: KOSAKI Motohiro @ 2010-10-18 1:28 UTC (permalink / raw)
To: fweisbec
Cc: kosaki.motohiro, Valdis.Kletnieks, Andrew Morton, Paul Mackerras,
Ingo Molnar, Arnaldo Carvalho de Melo, linux-kernel,
Peter Zijlstra
> On Wed, 2010-10-06 at 05:32 -0400, Valdis.Kletnieks@vt.edu wrote:
> > Dell Latitude E6500, Intel Core2 Duo P8700 CPU.
> >
> > Have seen this three times now while trying to attach gdb to a hung Firefox
> > process.
> >
> > [20669.480674] BUG: unable to handle kernel NULL pointer dereference at 0000000000000100
> > [20669.480682] IP: [<ffffffff810b8275>] __reserve_bp_slot+0x56/0x17d
>
> Known issue I think, Frederic was looking into curing this.
>
> Frederic, what's the current status of that?
mmotm1014 seems still have this issue. Frederic, can you please tell us
current status if you are tracking this issue?
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: 2.6.36-rc5-mmotm0928 BUG while trying to ptrace a process
2010-10-18 1:28 ` KOSAKI Motohiro
@ 2010-10-18 1:36 ` Frederic Weisbecker
2010-10-18 2:01 ` KOSAKI Motohiro
0 siblings, 1 reply; 6+ messages in thread
From: Frederic Weisbecker @ 2010-10-18 1:36 UTC (permalink / raw)
To: KOSAKI Motohiro
Cc: Valdis.Kletnieks, Andrew Morton, Paul Mackerras, Ingo Molnar,
Arnaldo Carvalho de Melo, linux-kernel, Peter Zijlstra
On Mon, Oct 18, 2010 at 10:28:43AM +0900, KOSAKI Motohiro wrote:
> > On Wed, 2010-10-06 at 05:32 -0400, Valdis.Kletnieks@vt.edu wrote:
> > > Dell Latitude E6500, Intel Core2 Duo P8700 CPU.
> > >
> > > Have seen this three times now while trying to attach gdb to a hung Firefox
> > > process.
> > >
> > > [20669.480674] BUG: unable to handle kernel NULL pointer dereference at 0000000000000100
> > > [20669.480682] IP: [<ffffffff810b8275>] __reserve_bp_slot+0x56/0x17d
> >
> > Known issue I think, Frederic was looking into curing this.
> >
> > Frederic, what's the current status of that?
>
> mmotm1014 seems still have this issue. Frederic, can you please tell us
> current status if you are tracking this issue?
Peter has a pending queue for .37 which includes:
[RFC][PATCH 3/7] perf, hw_breakpoint: Fix crash in hw_breakpoint creation
This patch should fix the issue (it depends on others in the queue).
What is mmotm1014 BTW? Because you should see this bug only in a tree
that has tip:/perf/core merged inside, like linux-next.
Thanks.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: 2.6.36-rc5-mmotm0928 BUG while trying to ptrace a process
2010-10-18 1:36 ` Frederic Weisbecker
@ 2010-10-18 2:01 ` KOSAKI Motohiro
2010-10-18 2:04 ` Frederic Weisbecker
0 siblings, 1 reply; 6+ messages in thread
From: KOSAKI Motohiro @ 2010-10-18 2:01 UTC (permalink / raw)
To: Frederic Weisbecker
Cc: kosaki.motohiro, Valdis.Kletnieks, Andrew Morton, Paul Mackerras,
Ingo Molnar, Arnaldo Carvalho de Melo, linux-kernel,
Peter Zijlstra
> On Mon, Oct 18, 2010 at 10:28:43AM +0900, KOSAKI Motohiro wrote:
> > > On Wed, 2010-10-06 at 05:32 -0400, Valdis.Kletnieks@vt.edu wrote:
> > > > Dell Latitude E6500, Intel Core2 Duo P8700 CPU.
> > > >
> > > > Have seen this three times now while trying to attach gdb to a hung Firefox
> > > > process.
> > > >
> > > > [20669.480674] BUG: unable to handle kernel NULL pointer dereference at 0000000000000100
> > > > [20669.480682] IP: [<ffffffff810b8275>] __reserve_bp_slot+0x56/0x17d
> > >
> > > Known issue I think, Frederic was looking into curing this.
> > >
> > > Frederic, what's the current status of that?
> >
> > mmotm1014 seems still have this issue. Frederic, can you please tell us
> > current status if you are tracking this issue?
>
>
> Peter has a pending queue for .37 which includes:
>
> [RFC][PATCH 3/7] perf, hw_breakpoint: Fix crash in hw_breakpoint creation
>
> This patch should fix the issue (it depends on others in the queue).
>
> What is mmotm1014 BTW? Because you should see this bug only in a tree
> that has tip:/perf/core merged inside, like linux-next.
mmotm is (usually) linux-next + akpm fixes. if a change of tip is exported
to linux-next, it is visible from mmotm tester :)
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: 2.6.36-rc5-mmotm0928 BUG while trying to ptrace a process
2010-10-18 2:01 ` KOSAKI Motohiro
@ 2010-10-18 2:04 ` Frederic Weisbecker
0 siblings, 0 replies; 6+ messages in thread
From: Frederic Weisbecker @ 2010-10-18 2:04 UTC (permalink / raw)
To: KOSAKI Motohiro
Cc: Valdis.Kletnieks, Andrew Morton, Paul Mackerras, Ingo Molnar,
Arnaldo Carvalho de Melo, linux-kernel, Peter Zijlstra
On Mon, Oct 18, 2010 at 11:01:18AM +0900, KOSAKI Motohiro wrote:
> > On Mon, Oct 18, 2010 at 10:28:43AM +0900, KOSAKI Motohiro wrote:
> > > > On Wed, 2010-10-06 at 05:32 -0400, Valdis.Kletnieks@vt.edu wrote:
> > > > > Dell Latitude E6500, Intel Core2 Duo P8700 CPU.
> > > > >
> > > > > Have seen this three times now while trying to attach gdb to a hung Firefox
> > > > > process.
> > > > >
> > > > > [20669.480674] BUG: unable to handle kernel NULL pointer dereference at 0000000000000100
> > > > > [20669.480682] IP: [<ffffffff810b8275>] __reserve_bp_slot+0x56/0x17d
> > > >
> > > > Known issue I think, Frederic was looking into curing this.
> > > >
> > > > Frederic, what's the current status of that?
> > >
> > > mmotm1014 seems still have this issue. Frederic, can you please tell us
> > > current status if you are tracking this issue?
> >
> >
> > Peter has a pending queue for .37 which includes:
> >
> > [RFC][PATCH 3/7] perf, hw_breakpoint: Fix crash in hw_breakpoint creation
> >
> > This patch should fix the issue (it depends on others in the queue).
> >
> > What is mmotm1014 BTW? Because you should see this bug only in a tree
> > that has tip:/perf/core merged inside, like linux-next.
>
> mmotm is (usually) linux-next + akpm fixes. if a change of tip is exported
> to linux-next, it is visible from mmotm tester :)
Ok, thanks for the info :)
^ permalink raw reply [flat|nested] 6+ messages in thread
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2010-10-06 9:32 2.6.36-rc5-mmotm0928 BUG while trying to ptrace a process Valdis.Kletnieks
2010-10-06 13:45 ` Peter Zijlstra
2010-10-18 1:28 ` KOSAKI Motohiro
2010-10-18 1:36 ` Frederic Weisbecker
2010-10-18 2:01 ` KOSAKI Motohiro
2010-10-18 2:04 ` Frederic Weisbecker
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