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Date: Wed, 26 Feb 2020 01:07:58 +0300
From: Tobias Koch <>
Subject: Crash on (qemu'ed) s390x doing prlimit call after probing stack size


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.


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