From: Szabolcs Nagy <nsz@port70.net>
To: Carl Chave <online@chave.us>
Cc: Rich Felker <dalias@libc.org>, musl@lists.openwall.com
Subject: Re: [musl] Hung processes with althttpd web server
Date: Thu, 5 Oct 2023 15:39:26 +0200 [thread overview]
Message-ID: <20231005133926.GC1427497@port70.net> (raw)
In-Reply-To: <CAGP1gyM6P76mrJyXuLrdfCswGdtxrQZgPm2QY8xpU2ayzY_O-Q@mail.gmail.com>
* Carl Chave <online@chave.us> [2023-10-04 22:43:16 -0400]:
> > 1. What Alpine/musl version are you using? If it's older, it might be
> > something that would be different in current versions.
>
> Alpine 3.18.3 with musl package musl-1.2.4-r1 x86_64
>
> > 2. Can you attach gdb to the hung process and identify what lock
> > object it's waiting on?
>
> I don't really know what I'm doing with gdb. This is probably not helpful:
> (gdb) bt
> #0 0x00007f5fb449c0dd in ?? () from /lib/ld-musl-x86_64.so.1
> #1 0x0000000000000002 in ?? ()
> #2 0x0000000000000000 in ?? ()
you might want to
apk add musl-dbg
the bt should be more useful then.
in this case you can also look at
(gdb) disas $rip-40,+80
(gdb) info reg
since the address is the first arg to a futex syscall (rdi).
then you can try to dig around to see where rdi points to
(gdb) x/4wx $rdi-4
(gdb) info sym $rdi
etc
next prev parent reply other threads:[~2023-10-05 13:39 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-05 1:41 Carl Chave
2023-10-05 2:15 ` Rich Felker
2023-10-05 2:43 ` Carl Chave
2023-10-05 13:39 ` Szabolcs Nagy [this message]
2023-10-05 18:26 ` Carl Chave
2023-10-05 18:48 ` Markus Wichmann
2023-10-05 19:06 ` Carl Chave
2023-10-05 3:37 ` Markus Wichmann
2023-10-05 12:39 ` Rich Felker
2023-10-05 18:34 ` Markus Wichmann
2023-10-05 18:52 ` Carl Chave
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