[Pkg-zsh-devel] Bug#993843: Bug#993843: zsh-static segfaults immediately

[Vincent Lefevre]

On 2021-09-07 12:23:38 +0200, Axel Beckert wrote:
> A first strace ends as follows:
> 
> mprotect(0x7f75ad335000, 4096, PROT_READ) = 0
> munmap(0x7f75ad337000, 327870)          = 0
> mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f75ad03a000
> openat(AT_FDCWD, "/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 11
> fstat(11, {st_mode=S_IFREG|0644, st_size=526, ...}) = 0
> read(11, "# /etc/nsswitch.conf\n#\n# Example"..., 4096) = 526
> --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0xe0} ---
> +++ killed by SIGSEGV (core dumped) +++

A more interesting part of the strace output:

[...]
223550 openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 11
223550 read(11, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200\177\2\0\0\0\0\0"..., 832) = 832
223550 fstat(11, {st_mode=S_IFREG|0755, st_size=1839168, ...}) = 0
223550 mmap(NULL, 1852480, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 11, 0) = 0x7f8847303000
223550 mprotect(0x7f8847329000, 1658880, PROT_NONE) = 0
223550 mmap(0x7f8847329000, 1347584, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 11, 0x26000) = 0x7f8847329000
223550 mmap(0x7f8847472000, 307200, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 11, 0x16f000) = 0x7f8847472000
223550 mmap(0x7f88474be000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 11, 0x1ba000) = 0x7f88474be000
223550 mmap(0x7f88474c4000, 13376, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f88474c4000
223550 close(11)                        = 0
[...]

zsh-static is linked statically. What does it have to do with libc.so.6?
If it expects some functions from libc.so.6 and others that had been
linked statically, then with the upgrade of libc6 to 2.32-1, I think
that this is likely to break.

-- 
Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)