* [PATCH v2] powerpc/kprobes: Fix kprobe Oops happens in booke
@ 2021-08-09 2:36 Pu Lehui
2021-08-11 2:53 ` Pu Lehui
2021-08-13 11:57 ` Michael Ellerman
0 siblings, 2 replies; 5+ messages in thread
From: Pu Lehui @ 2021-08-09 2:36 UTC (permalink / raw)
To: mpe, benh, paulus, naveen.n.rao, mhiramat, peterz,
christophe.leroy, npiggin, ruscur
Cc: linuxppc-dev, linux-kernel, zhangjinhao2, pulehui
When using kprobe on powerpc booke series processor, Oops happens
as show bellow:
/ # echo "p:myprobe do_nanosleep" > /sys/kernel/debug/tracing/kprobe_events
/ # echo 1 > /sys/kernel/debug/tracing/events/kprobes/myprobe/enable
/ # sleep 1
[ 50.076730] Oops: Exception in kernel mode, sig: 5 [#1]
[ 50.077017] BE PAGE_SIZE=4K SMP NR_CPUS=24 QEMU e500
[ 50.077221] Modules linked in:
[ 50.077462] CPU: 0 PID: 77 Comm: sleep Not tainted 5.14.0-rc4-00022-g251a1524293d #21
[ 50.077887] NIP: c0b9c4e0 LR: c00ebecc CTR: 00000000
[ 50.078067] REGS: c3883de0 TRAP: 0700 Not tainted (5.14.0-rc4-00022-g251a1524293d)
[ 50.078349] MSR: 00029000 <CE,EE,ME> CR: 24000228 XER: 20000000
[ 50.078675]
[ 50.078675] GPR00: c00ebdf0 c3883e90 c313e300 c3883ea0 00000001 00000000 c3883ecc 00000001
[ 50.078675] GPR08: c100598c c00ea250 00000004 00000000 24000222 102490c2 bff4180c 101e60d4
[ 50.078675] GPR16: 00000000 102454ac 00000040 10240000 10241100 102410f8 10240000 00500000
[ 50.078675] GPR24: 00000002 00000000 c3883ea0 00000001 00000000 0000c350 3b9b8d50 00000000
[ 50.080151] NIP [c0b9c4e0] do_nanosleep+0x0/0x190
[ 50.080352] LR [c00ebecc] hrtimer_nanosleep+0x14c/0x1e0
[ 50.080638] Call Trace:
[ 50.080801] [c3883e90] [c00ebdf0] hrtimer_nanosleep+0x70/0x1e0 (unreliable)
[ 50.081110] [c3883f00] [c00ec004] sys_nanosleep_time32+0xa4/0x110
[ 50.081336] [c3883f40] [c001509c] ret_from_syscall+0x0/0x28
[ 50.081541] --- interrupt: c00 at 0x100a4d08
[ 50.081749] NIP: 100a4d08 LR: 101b5234 CTR: 00000003
[ 50.081931] REGS: c3883f50 TRAP: 0c00 Not tainted (5.14.0-rc4-00022-g251a1524293d)
[ 50.082183] MSR: 0002f902 <CE,EE,PR,FP,ME> CR: 24000222 XER: 00000000
[ 50.082457]
[ 50.082457] GPR00: 000000a2 bf980040 1024b4d0 bf980084 bf980084 64000000 00555345 fefefeff
[ 50.082457] GPR08: 7f7f7f7f 101e0000 00000069 00000003 28000422 102490c2 bff4180c 101e60d4
[ 50.082457] GPR16: 00000000 102454ac 00000040 10240000 10241100 102410f8 10240000 00500000
[ 50.082457] GPR24: 00000002 bf9803f4 10240000 00000000 00000000 100039e0 00000000 102444e8
[ 50.083789] NIP [100a4d08] 0x100a4d08
[ 50.083917] LR [101b5234] 0x101b5234
[ 50.084042] --- interrupt: c00
[ 50.084238] Instruction dump:
[ 50.084483] 4bfffc40 60000000 60000000 60000000 9421fff0 39400402 914200c0 38210010
[ 50.084841] 4bfffc20 00000000 00000000 00000000 <7fe00008> 7c0802a6 7c892378 93c10048
[ 50.085487] ---[ end trace f6fffe98e2fa8f3e ]---
[ 50.085678]
Trace/breakpoint trap
There is no real mode for booke arch and the MMU translation is
always on. The corresponding MSR_IS/MSR_DS bit in booke is used
to switch the address space, but not for real mode judgment.
Fixes: 21f8b2fa3ca5 ("powerpc/kprobes: Ignore traps that happened in real mode")
Signed-off-by: Pu Lehui <pulehui@huawei.com>
---
v1->v2:
- use IS_ENABLED(CONFIG_BOOKE) as suggested by Michael Ellerman and
Christophe Leroy
- update Oops log to make problem clear
arch/powerpc/kernel/kprobes.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index cbc28d1a2e1b..7a7cd6bda53e 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -292,7 +292,8 @@ int kprobe_handler(struct pt_regs *regs)
if (user_mode(regs))
return 0;
- if (!(regs->msr & MSR_IR) || !(regs->msr & MSR_DR))
+ if (!IS_ENABLED(CONFIG_BOOKE) &&
+ (!(regs->msr & MSR_IR) || !(regs->msr & MSR_DR)))
return 0;
/*
--
2.17.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2] powerpc/kprobes: Fix kprobe Oops happens in booke
2021-08-09 2:36 [PATCH v2] powerpc/kprobes: Fix kprobe Oops happens in booke Pu Lehui
@ 2021-08-11 2:53 ` Pu Lehui
2021-08-11 5:31 ` Christophe Leroy
2021-08-13 11:57 ` Michael Ellerman
1 sibling, 1 reply; 5+ messages in thread
From: Pu Lehui @ 2021-08-11 2:53 UTC (permalink / raw)
To: mpe, benh, paulus, naveen.n.rao, mhiramat, peterz,
christophe.leroy, npiggin, ruscur
Cc: linuxppc-dev, linux-kernel, zhangjinhao2
Ping, serious problem here. All booke ppc will trigger Oops when
perform kprobes related operations.
On 2021/8/9 10:36, Pu Lehui wrote:
> When using kprobe on powerpc booke series processor, Oops happens
> as show bellow:
>
> / # echo "p:myprobe do_nanosleep" > /sys/kernel/debug/tracing/kprobe_events
> / # echo 1 > /sys/kernel/debug/tracing/events/kprobes/myprobe/enable
> / # sleep 1
> [ 50.076730] Oops: Exception in kernel mode, sig: 5 [#1]
> [ 50.077017] BE PAGE_SIZE=4K SMP NR_CPUS=24 QEMU e500
> [ 50.077221] Modules linked in:
> [ 50.077462] CPU: 0 PID: 77 Comm: sleep Not tainted 5.14.0-rc4-00022-g251a1524293d #21
> [ 50.077887] NIP: c0b9c4e0 LR: c00ebecc CTR: 00000000
> [ 50.078067] REGS: c3883de0 TRAP: 0700 Not tainted (5.14.0-rc4-00022-g251a1524293d)
> [ 50.078349] MSR: 00029000 <CE,EE,ME> CR: 24000228 XER: 20000000
> [ 50.078675]
> [ 50.078675] GPR00: c00ebdf0 c3883e90 c313e300 c3883ea0 00000001 00000000 c3883ecc 00000001
> [ 50.078675] GPR08: c100598c c00ea250 00000004 00000000 24000222 102490c2 bff4180c 101e60d4
> [ 50.078675] GPR16: 00000000 102454ac 00000040 10240000 10241100 102410f8 10240000 00500000
> [ 50.078675] GPR24: 00000002 00000000 c3883ea0 00000001 00000000 0000c350 3b9b8d50 00000000
> [ 50.080151] NIP [c0b9c4e0] do_nanosleep+0x0/0x190
> [ 50.080352] LR [c00ebecc] hrtimer_nanosleep+0x14c/0x1e0
> [ 50.080638] Call Trace:
> [ 50.080801] [c3883e90] [c00ebdf0] hrtimer_nanosleep+0x70/0x1e0 (unreliable)
> [ 50.081110] [c3883f00] [c00ec004] sys_nanosleep_time32+0xa4/0x110
> [ 50.081336] [c3883f40] [c001509c] ret_from_syscall+0x0/0x28
> [ 50.081541] --- interrupt: c00 at 0x100a4d08
> [ 50.081749] NIP: 100a4d08 LR: 101b5234 CTR: 00000003
> [ 50.081931] REGS: c3883f50 TRAP: 0c00 Not tainted (5.14.0-rc4-00022-g251a1524293d)
> [ 50.082183] MSR: 0002f902 <CE,EE,PR,FP,ME> CR: 24000222 XER: 00000000
> [ 50.082457]
> [ 50.082457] GPR00: 000000a2 bf980040 1024b4d0 bf980084 bf980084 64000000 00555345 fefefeff
> [ 50.082457] GPR08: 7f7f7f7f 101e0000 00000069 00000003 28000422 102490c2 bff4180c 101e60d4
> [ 50.082457] GPR16: 00000000 102454ac 00000040 10240000 10241100 102410f8 10240000 00500000
> [ 50.082457] GPR24: 00000002 bf9803f4 10240000 00000000 00000000 100039e0 00000000 102444e8
> [ 50.083789] NIP [100a4d08] 0x100a4d08
> [ 50.083917] LR [101b5234] 0x101b5234
> [ 50.084042] --- interrupt: c00
> [ 50.084238] Instruction dump:
> [ 50.084483] 4bfffc40 60000000 60000000 60000000 9421fff0 39400402 914200c0 38210010
> [ 50.084841] 4bfffc20 00000000 00000000 00000000 <7fe00008> 7c0802a6 7c892378 93c10048
> [ 50.085487] ---[ end trace f6fffe98e2fa8f3e ]---
> [ 50.085678]
> Trace/breakpoint trap
>
> There is no real mode for booke arch and the MMU translation is
> always on. The corresponding MSR_IS/MSR_DS bit in booke is used
> to switch the address space, but not for real mode judgment.
>
> Fixes: 21f8b2fa3ca5 ("powerpc/kprobes: Ignore traps that happened in real mode")
> Signed-off-by: Pu Lehui <pulehui@huawei.com>
> ---
> v1->v2:
> - use IS_ENABLED(CONFIG_BOOKE) as suggested by Michael Ellerman and
> Christophe Leroy
> - update Oops log to make problem clear
>
> arch/powerpc/kernel/kprobes.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
> index cbc28d1a2e1b..7a7cd6bda53e 100644
> --- a/arch/powerpc/kernel/kprobes.c
> +++ b/arch/powerpc/kernel/kprobes.c
> @@ -292,7 +292,8 @@ int kprobe_handler(struct pt_regs *regs)
> if (user_mode(regs))
> return 0;
>
> - if (!(regs->msr & MSR_IR) || !(regs->msr & MSR_DR))
> + if (!IS_ENABLED(CONFIG_BOOKE) &&
> + (!(regs->msr & MSR_IR) || !(regs->msr & MSR_DR)))
> return 0;
>
> /*
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2] powerpc/kprobes: Fix kprobe Oops happens in booke
2021-08-11 2:53 ` Pu Lehui
@ 2021-08-11 5:31 ` Christophe Leroy
2021-08-11 6:48 ` Pu Lehui
0 siblings, 1 reply; 5+ messages in thread
From: Christophe Leroy @ 2021-08-11 5:31 UTC (permalink / raw)
To: Pu Lehui, mpe, benh, paulus, naveen.n.rao, mhiramat, peterz,
npiggin, ruscur
Cc: linuxppc-dev, linux-kernel, zhangjinhao2
Le 11/08/2021 à 04:53, Pu Lehui a écrit :
> Ping, serious problem here. All booke ppc will trigger Oops when
> perform kprobes related operations.
As far as I can see it is in the fixes branch:
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/log/?h=fixes
>
> On 2021/8/9 10:36, Pu Lehui wrote:
>> When using kprobe on powerpc booke series processor, Oops happens
>> as show bellow:
>>
>> / # echo "p:myprobe do_nanosleep" > /sys/kernel/debug/tracing/kprobe_events
>> / # echo 1 > /sys/kernel/debug/tracing/events/kprobes/myprobe/enable
>> / # sleep 1
>> [ 50.076730] Oops: Exception in kernel mode, sig: 5 [#1]
>> [ 50.077017] BE PAGE_SIZE=4K SMP NR_CPUS=24 QEMU e500
>> [ 50.077221] Modules linked in:
>> [ 50.077462] CPU: 0 PID: 77 Comm: sleep Not tainted 5.14.0-rc4-00022-g251a1524293d #21
>> [ 50.077887] NIP: c0b9c4e0 LR: c00ebecc CTR: 00000000
>> [ 50.078067] REGS: c3883de0 TRAP: 0700 Not tainted (5.14.0-rc4-00022-g251a1524293d)
>> [ 50.078349] MSR: 00029000 <CE,EE,ME> CR: 24000228 XER: 20000000
>> [ 50.078675]
>> [ 50.078675] GPR00: c00ebdf0 c3883e90 c313e300 c3883ea0 00000001 00000000 c3883ecc 00000001
>> [ 50.078675] GPR08: c100598c c00ea250 00000004 00000000 24000222 102490c2 bff4180c 101e60d4
>> [ 50.078675] GPR16: 00000000 102454ac 00000040 10240000 10241100 102410f8 10240000 00500000
>> [ 50.078675] GPR24: 00000002 00000000 c3883ea0 00000001 00000000 0000c350 3b9b8d50 00000000
>> [ 50.080151] NIP [c0b9c4e0] do_nanosleep+0x0/0x190
>> [ 50.080352] LR [c00ebecc] hrtimer_nanosleep+0x14c/0x1e0
>> [ 50.080638] Call Trace:
>> [ 50.080801] [c3883e90] [c00ebdf0] hrtimer_nanosleep+0x70/0x1e0 (unreliable)
>> [ 50.081110] [c3883f00] [c00ec004] sys_nanosleep_time32+0xa4/0x110
>> [ 50.081336] [c3883f40] [c001509c] ret_from_syscall+0x0/0x28
>> [ 50.081541] --- interrupt: c00 at 0x100a4d08
>> [ 50.081749] NIP: 100a4d08 LR: 101b5234 CTR: 00000003
>> [ 50.081931] REGS: c3883f50 TRAP: 0c00 Not tainted (5.14.0-rc4-00022-g251a1524293d)
>> [ 50.082183] MSR: 0002f902 <CE,EE,PR,FP,ME> CR: 24000222 XER: 00000000
>> [ 50.082457]
>> [ 50.082457] GPR00: 000000a2 bf980040 1024b4d0 bf980084 bf980084 64000000 00555345 fefefeff
>> [ 50.082457] GPR08: 7f7f7f7f 101e0000 00000069 00000003 28000422 102490c2 bff4180c 101e60d4
>> [ 50.082457] GPR16: 00000000 102454ac 00000040 10240000 10241100 102410f8 10240000 00500000
>> [ 50.082457] GPR24: 00000002 bf9803f4 10240000 00000000 00000000 100039e0 00000000 102444e8
>> [ 50.083789] NIP [100a4d08] 0x100a4d08
>> [ 50.083917] LR [101b5234] 0x101b5234
>> [ 50.084042] --- interrupt: c00
>> [ 50.084238] Instruction dump:
>> [ 50.084483] 4bfffc40 60000000 60000000 60000000 9421fff0 39400402 914200c0 38210010
>> [ 50.084841] 4bfffc20 00000000 00000000 00000000 <7fe00008> 7c0802a6 7c892378 93c10048
>> [ 50.085487] ---[ end trace f6fffe98e2fa8f3e ]---
>> [ 50.085678]
>> Trace/breakpoint trap
>>
>> There is no real mode for booke arch and the MMU translation is
>> always on. The corresponding MSR_IS/MSR_DS bit in booke is used
>> to switch the address space, but not for real mode judgment.
>>
>> Fixes: 21f8b2fa3ca5 ("powerpc/kprobes: Ignore traps that happened in real mode")
>> Signed-off-by: Pu Lehui <pulehui@huawei.com>
>> ---
>> v1->v2:
>> - use IS_ENABLED(CONFIG_BOOKE) as suggested by Michael Ellerman and
>> Christophe Leroy
>> - update Oops log to make problem clear
>>
>> arch/powerpc/kernel/kprobes.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
>> index cbc28d1a2e1b..7a7cd6bda53e 100644
>> --- a/arch/powerpc/kernel/kprobes.c
>> +++ b/arch/powerpc/kernel/kprobes.c
>> @@ -292,7 +292,8 @@ int kprobe_handler(struct pt_regs *regs)
>> if (user_mode(regs))
>> return 0;
>> - if (!(regs->msr & MSR_IR) || !(regs->msr & MSR_DR))
>> + if (!IS_ENABLED(CONFIG_BOOKE) &&
>> + (!(regs->msr & MSR_IR) || !(regs->msr & MSR_DR)))
>> return 0;
>> /*
>>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2] powerpc/kprobes: Fix kprobe Oops happens in booke
2021-08-11 5:31 ` Christophe Leroy
@ 2021-08-11 6:48 ` Pu Lehui
0 siblings, 0 replies; 5+ messages in thread
From: Pu Lehui @ 2021-08-11 6:48 UTC (permalink / raw)
To: Christophe Leroy
Cc: mpe, linuxppc-dev, linux-kernel, zhangjinhao2, naveen.n.rao,
benh, paulus, mhiramat, peterz, npiggin, ruscur
On 2021/8/11 13:31, Christophe Leroy wrote:
>
>
> Le 11/08/2021 à 04:53, Pu Lehui a écrit :
>> Ping, serious problem here. All booke ppc will trigger Oops when
>> perform kprobes related operations.
>
> As far as I can see it is in the fixes branch:
> https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/log/?h=fixes
>
>
Thanks.
>>
>> On 2021/8/9 10:36, Pu Lehui wrote:
>>> When using kprobe on powerpc booke series processor, Oops happens
>>> as show bellow:
>>>
>>> / # echo "p:myprobe do_nanosleep" >
>>> /sys/kernel/debug/tracing/kprobe_events
>>> / # echo 1 > /sys/kernel/debug/tracing/events/kprobes/myprobe/enable
>>> / # sleep 1
>>> [ 50.076730] Oops: Exception in kernel mode, sig: 5 [#1]
>>> [ 50.077017] BE PAGE_SIZE=4K SMP NR_CPUS=24 QEMU e500
>>> [ 50.077221] Modules linked in:
>>> [ 50.077462] CPU: 0 PID: 77 Comm: sleep Not tainted
>>> 5.14.0-rc4-00022-g251a1524293d #21
>>> [ 50.077887] NIP: c0b9c4e0 LR: c00ebecc CTR: 00000000
>>> [ 50.078067] REGS: c3883de0 TRAP: 0700 Not tainted
>>> (5.14.0-rc4-00022-g251a1524293d)
>>> [ 50.078349] MSR: 00029000 <CE,EE,ME> CR: 24000228 XER: 20000000
>>> [ 50.078675]
>>> [ 50.078675] GPR00: c00ebdf0 c3883e90 c313e300 c3883ea0 00000001
>>> 00000000 c3883ecc 00000001
>>> [ 50.078675] GPR08: c100598c c00ea250 00000004 00000000 24000222
>>> 102490c2 bff4180c 101e60d4
>>> [ 50.078675] GPR16: 00000000 102454ac 00000040 10240000 10241100
>>> 102410f8 10240000 00500000
>>> [ 50.078675] GPR24: 00000002 00000000 c3883ea0 00000001 00000000
>>> 0000c350 3b9b8d50 00000000
>>> [ 50.080151] NIP [c0b9c4e0] do_nanosleep+0x0/0x190
>>> [ 50.080352] LR [c00ebecc] hrtimer_nanosleep+0x14c/0x1e0
>>> [ 50.080638] Call Trace:
>>> [ 50.080801] [c3883e90] [c00ebdf0] hrtimer_nanosleep+0x70/0x1e0
>>> (unreliable)
>>> [ 50.081110] [c3883f00] [c00ec004] sys_nanosleep_time32+0xa4/0x110
>>> [ 50.081336] [c3883f40] [c001509c] ret_from_syscall+0x0/0x28
>>> [ 50.081541] --- interrupt: c00 at 0x100a4d08
>>> [ 50.081749] NIP: 100a4d08 LR: 101b5234 CTR: 00000003
>>> [ 50.081931] REGS: c3883f50 TRAP: 0c00 Not tainted
>>> (5.14.0-rc4-00022-g251a1524293d)
>>> [ 50.082183] MSR: 0002f902 <CE,EE,PR,FP,ME> CR: 24000222 XER:
>>> 00000000
>>> [ 50.082457]
>>> [ 50.082457] GPR00: 000000a2 bf980040 1024b4d0 bf980084 bf980084
>>> 64000000 00555345 fefefeff
>>> [ 50.082457] GPR08: 7f7f7f7f 101e0000 00000069 00000003 28000422
>>> 102490c2 bff4180c 101e60d4
>>> [ 50.082457] GPR16: 00000000 102454ac 00000040 10240000 10241100
>>> 102410f8 10240000 00500000
>>> [ 50.082457] GPR24: 00000002 bf9803f4 10240000 00000000 00000000
>>> 100039e0 00000000 102444e8
>>> [ 50.083789] NIP [100a4d08] 0x100a4d08
>>> [ 50.083917] LR [101b5234] 0x101b5234
>>> [ 50.084042] --- interrupt: c00
>>> [ 50.084238] Instruction dump:
>>> [ 50.084483] 4bfffc40 60000000 60000000 60000000 9421fff0 39400402
>>> 914200c0 38210010
>>> [ 50.084841] 4bfffc20 00000000 00000000 00000000 <7fe00008>
>>> 7c0802a6 7c892378 93c10048
>>> [ 50.085487] ---[ end trace f6fffe98e2fa8f3e ]---
>>> [ 50.085678]
>>> Trace/breakpoint trap
>>>
>>> There is no real mode for booke arch and the MMU translation is
>>> always on. The corresponding MSR_IS/MSR_DS bit in booke is used
>>> to switch the address space, but not for real mode judgment.
>>>
>>> Fixes: 21f8b2fa3ca5 ("powerpc/kprobes: Ignore traps that happened in
>>> real mode")
>>> Signed-off-by: Pu Lehui <pulehui@huawei.com>
>>> ---
>>> v1->v2:
>>> - use IS_ENABLED(CONFIG_BOOKE) as suggested by Michael Ellerman and
>>> Christophe Leroy
>>> - update Oops log to make problem clear
>>>
>>> arch/powerpc/kernel/kprobes.c | 3 ++-
>>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/powerpc/kernel/kprobes.c
>>> b/arch/powerpc/kernel/kprobes.c
>>> index cbc28d1a2e1b..7a7cd6bda53e 100644
>>> --- a/arch/powerpc/kernel/kprobes.c
>>> +++ b/arch/powerpc/kernel/kprobes.c
>>> @@ -292,7 +292,8 @@ int kprobe_handler(struct pt_regs *regs)
>>> if (user_mode(regs))
>>> return 0;
>>> - if (!(regs->msr & MSR_IR) || !(regs->msr & MSR_DR))
>>> + if (!IS_ENABLED(CONFIG_BOOKE) &&
>>> + (!(regs->msr & MSR_IR) || !(regs->msr & MSR_DR)))
>>> return 0;
>>> /*
>>>
> .
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2] powerpc/kprobes: Fix kprobe Oops happens in booke
2021-08-09 2:36 [PATCH v2] powerpc/kprobes: Fix kprobe Oops happens in booke Pu Lehui
2021-08-11 2:53 ` Pu Lehui
@ 2021-08-13 11:57 ` Michael Ellerman
1 sibling, 0 replies; 5+ messages in thread
From: Michael Ellerman @ 2021-08-13 11:57 UTC (permalink / raw)
To: mhiramat, benh, ruscur, naveen.n.rao, christophe.leroy, npiggin,
mpe, peterz, Pu Lehui, paulus
Cc: linuxppc-dev, linux-kernel, zhangjinhao2
On Mon, 9 Aug 2021 10:36:58 +0800, Pu Lehui wrote:
> When using kprobe on powerpc booke series processor, Oops happens
> as show bellow:
>
> / # echo "p:myprobe do_nanosleep" > /sys/kernel/debug/tracing/kprobe_events
> / # echo 1 > /sys/kernel/debug/tracing/events/kprobes/myprobe/enable
> / # sleep 1
> [ 50.076730] Oops: Exception in kernel mode, sig: 5 [#1]
> [ 50.077017] BE PAGE_SIZE=4K SMP NR_CPUS=24 QEMU e500
> [ 50.077221] Modules linked in:
> [ 50.077462] CPU: 0 PID: 77 Comm: sleep Not tainted 5.14.0-rc4-00022-g251a1524293d #21
> [ 50.077887] NIP: c0b9c4e0 LR: c00ebecc CTR: 00000000
> [ 50.078067] REGS: c3883de0 TRAP: 0700 Not tainted (5.14.0-rc4-00022-g251a1524293d)
> [ 50.078349] MSR: 00029000 <CE,EE,ME> CR: 24000228 XER: 20000000
> [ 50.078675]
> [ 50.078675] GPR00: c00ebdf0 c3883e90 c313e300 c3883ea0 00000001 00000000 c3883ecc 00000001
> [ 50.078675] GPR08: c100598c c00ea250 00000004 00000000 24000222 102490c2 bff4180c 101e60d4
> [ 50.078675] GPR16: 00000000 102454ac 00000040 10240000 10241100 102410f8 10240000 00500000
> [ 50.078675] GPR24: 00000002 00000000 c3883ea0 00000001 00000000 0000c350 3b9b8d50 00000000
> [ 50.080151] NIP [c0b9c4e0] do_nanosleep+0x0/0x190
> [ 50.080352] LR [c00ebecc] hrtimer_nanosleep+0x14c/0x1e0
> [ 50.080638] Call Trace:
> [ 50.080801] [c3883e90] [c00ebdf0] hrtimer_nanosleep+0x70/0x1e0 (unreliable)
> [ 50.081110] [c3883f00] [c00ec004] sys_nanosleep_time32+0xa4/0x110
> [ 50.081336] [c3883f40] [c001509c] ret_from_syscall+0x0/0x28
> [ 50.081541] --- interrupt: c00 at 0x100a4d08
> [ 50.081749] NIP: 100a4d08 LR: 101b5234 CTR: 00000003
> [ 50.081931] REGS: c3883f50 TRAP: 0c00 Not tainted (5.14.0-rc4-00022-g251a1524293d)
> [ 50.082183] MSR: 0002f902 <CE,EE,PR,FP,ME> CR: 24000222 XER: 00000000
> [ 50.082457]
> [ 50.082457] GPR00: 000000a2 bf980040 1024b4d0 bf980084 bf980084 64000000 00555345 fefefeff
> [ 50.082457] GPR08: 7f7f7f7f 101e0000 00000069 00000003 28000422 102490c2 bff4180c 101e60d4
> [ 50.082457] GPR16: 00000000 102454ac 00000040 10240000 10241100 102410f8 10240000 00500000
> [ 50.082457] GPR24: 00000002 bf9803f4 10240000 00000000 00000000 100039e0 00000000 102444e8
> [ 50.083789] NIP [100a4d08] 0x100a4d08
> [ 50.083917] LR [101b5234] 0x101b5234
> [ 50.084042] --- interrupt: c00
> [ 50.084238] Instruction dump:
> [ 50.084483] 4bfffc40 60000000 60000000 60000000 9421fff0 39400402 914200c0 38210010
> [ 50.084841] 4bfffc20 00000000 00000000 00000000 <7fe00008> 7c0802a6 7c892378 93c10048
> [ 50.085487] ---[ end trace f6fffe98e2fa8f3e ]---
> [ 50.085678]
> Trace/breakpoint trap
>
> [...]
Applied to powerpc/fixes.
[1/1] powerpc/kprobes: Fix kprobe Oops happens in booke
https://git.kernel.org/powerpc/c/43e8f76006592cb1573a959aa287c45421066f9c
cheers
^ permalink raw reply [flat|nested] 5+ messages in thread
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Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-09 2:36 [PATCH v2] powerpc/kprobes: Fix kprobe Oops happens in booke Pu Lehui
2021-08-11 2:53 ` Pu Lehui
2021-08-11 5:31 ` Christophe Leroy
2021-08-11 6:48 ` Pu Lehui
2021-08-13 11:57 ` Michael Ellerman
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