* [musl] Crash on (qemu'ed) s390x doing prlimit call after probing stack size
@ 2020-02-25 22:07 Tobias Koch
2020-02-26 9:56 ` Szabolcs Nagy
0 siblings, 1 reply; 2+ messages in thread
From: Tobias Koch @ 2020-02-25 22:07 UTC (permalink / raw)
To: musl
Hi,
I have some programs crashing on me under QEMU s390x user emulation. I
see them probe the stack size using mremaps and then do a prlimit as in
this snippet
24948 mremap(274877911040,4096,8192,0,0,56) = -1 errno=12 (Cannot
allocate memory)
24948 mremap(274877906944,4096,8192,0,0,56) = -1 errno=12 (Cannot
allocate memory)
24948 mremap(274877902848,4096,8192,0,0,56) = -1 errno=14 (Bad address)
24948 prlimit64(0,3,0,274889373840,274879934536,56) = 0
--- SIGSEGV {si_signo=SIGSEGV, si_code=1, si_addr=0x0000004000001000} ---
Segmentation fault
The same programs on other 64bit arches (such as aarch64 or powerpc64le)
emluated with QEMU work OK. I'm trying to understand, what musl is doing
here and why QEMU cannot handle it.Any pointers would be appreciated.
Tobias
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [musl] Crash on (qemu'ed) s390x doing prlimit call after probing stack size
2020-02-25 22:07 [musl] Crash on (qemu'ed) s390x doing prlimit call after probing stack size Tobias Koch
@ 2020-02-26 9:56 ` Szabolcs Nagy
0 siblings, 0 replies; 2+ messages in thread
From: Szabolcs Nagy @ 2020-02-26 9:56 UTC (permalink / raw)
To: Tobias Koch; +Cc: musl
* Tobias Koch <tobias.koch@nonterra.com> [2020-02-26 01:07:58 +0300]:
> I have some programs crashing on me under QEMU s390x user emulation. I see
> them probe the stack size using mremaps and then do a prlimit as in this
> snippet
>
> 24948 mremap(274877911040,4096,8192,0,0,56) = -1 errno=12 (Cannot allocate
> memory)
> 24948 mremap(274877906944,4096,8192,0,0,56) = -1 errno=12 (Cannot allocate
> memory)
> 24948 mremap(274877902848,4096,8192,0,0,56) = -1 errno=14 (Bad address)
> 24948 prlimit64(0,3,0,274889373840,274879934536,56) = 0
> --- SIGSEGV {si_signo=SIGSEGV, si_code=1, si_addr=0x0000004000001000} ---
> Segmentation fault
i'd use
qemu-s390x -d page -strace exe
to see how 0x0000004000001000 is mapped and then
qemu-s390x -d page,in_asm,cpu,nochain -strace exe
to see the exact failing instruction, that may give a hint.
>
> The same programs on other 64bit arches (such as aarch64 or powerpc64le)
> emluated with QEMU work OK. I'm trying to understand, what musl is doing
> here and why QEMU cannot handle it.Any pointers would be appreciated.
>
> Tobias
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-02-25 22:07 [musl] Crash on (qemu'ed) s390x doing prlimit call after probing stack size Tobias Koch
2020-02-26 9:56 ` Szabolcs Nagy
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