From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-3.1 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 1589 invoked from network); 5 Oct 2023 18:27:10 -0000 Received: from second.openwall.net (193.110.157.125) by inbox.vuxu.org with ESMTPUTF8; 5 Oct 2023 18:27:10 -0000 Received: (qmail 7616 invoked by uid 550); 5 Oct 2023 18:27:06 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Reply-To: musl@lists.openwall.com Received: (qmail 7575 invoked from network); 5 Oct 2023 18:27:05 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chave-us.20230601.gappssmtp.com; s=20230601; t=1696530414; x=1697135214; darn=lists.openwall.com; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :from:to:cc:subject:date:message-id:reply-to; bh=50m3toljX05VJyU4FlLqxODPCrhCa0dVCjxzUPMUxL8=; b=JPqI4DLdb0oHRL9WEHoyxO8rDCzLJ9M1HpLafcWr12EGZSIdXPHCJcqPUUZbCclSuf 2xpcLJuXUlHlFns7YvjIbIreD3mrx0qiBOPFDKvkQiiOOGDJAjAGXdo0Hv18n2Y0Xekp peVTUmxjUHulO+ODDB3OsJqtyUXAzh4kp0PrDiYuRrovxfTOa+tYnx/LJEFZxwH1treo dN0+t1GXclxkBnS6JUIhhJ2Sym2YQmZ47Rj6t01HX0ATeQEIHSqx19b42nhzWVdE/9o3 kOf/8nveoR7nfxtHKgCCMlbIx7qPJFb0yz2L4PvQinewV+FKs4HbeKDEVFj8x0tCLIcG Y7zg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696530414; x=1697135214; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=50m3toljX05VJyU4FlLqxODPCrhCa0dVCjxzUPMUxL8=; b=tiZ1v6cT3ysQU40SIrIS4vMwClYicVA61m8vX3+e1/vKk8fkbzkXS3wdrAibe/DCoK Y7Iagv6hQZ3amIrRSMBLmyz+plOkMWoqwrRrzU07UIpE2BjrQ4ZgE4IDotw3YoHZS6hu ZarubZVk2R697t8prV+8pdPKlPIyp4Vbo1Tbqo1DhOMosLua2R0Zx/LHOwzq+cS0rJbM OZ1+MpJZBNxIExha83X02Qv83WSs80xXbMD8nydKuYXLZeNJhX3MYQjAlo2TY1v87yDe tyU06QwtGonZEfACAcUeY+UqCHnB1uKNLYxH/4vE8Ot32D0dnuJMw2MjrnOHwpQxyJ5n 6IMQ== X-Gm-Message-State: AOJu0YxS5hMY4nJrzqnKtDzl+OwqAUnooO5dXnXuNME0EysEWmf8577C 5PM6mlrXRsIDm02E/Z3B3S1wwhMcwv+qxLkd0IXEIZxbfI+tw0LpPXU= X-Google-Smtp-Source: AGHT+IFFVewF9H4qT4A6BLFNBR/22KDL8PhhxeLI5ztUy+ZVUlYIqBV9Ej4NXlZWDBi/plRCuPlVkZtcHTfMw//pLns= X-Received: by 2002:a05:6402:150d:b0:523:bfec:4915 with SMTP id f13-20020a056402150d00b00523bfec4915mr5931629edw.0.1696530413383; Thu, 05 Oct 2023 11:26:53 -0700 (PDT) MIME-Version: 1.0 References: <20231005021539.GG4163@brightrain.aerifal.cx> <20231005133926.GC1427497@port70.net> In-Reply-To: <20231005133926.GC1427497@port70.net> From: Carl Chave Date: Thu, 5 Oct 2023 14:26:42 -0400 Message-ID: To: musl@lists.openwall.com, Carl Chave , Rich Felker Content-Type: text/plain; charset="UTF-8" Subject: Re: [musl] Hung processes with althttpd web server > apk add musl-dbg > > the bt should be more useful then. (gdb) bt #0 __syscall_cp_c (nr=202, u=140049023633540, v=128, w=-2147483632, x=0, y=0, z=0) at ./arch/x86_64/syscall_arch.h:61 #1 0x00007f5fb449b6c9 in __futex4_cp (to=0x0, val=-2147483632, op=128, addr=0x7f5fb44e0884 ) at src/thread/__timedwait.c:24 #2 __timedwait_cp (addr=addr@entry=0x7f5fb44e0884 , val=val@entry=-2147483632, clk=clk@entry=0, at=at@entry=0x0, priv=priv@entry=128) at src/thread/__timedwait.c:52 #3 0x00007f5fb449b76e in __timedwait (addr=addr@entry=0x7f5fb44e0884 , val=-2147483632, clk=clk@entry=0, at=at@entry=0x0, priv=priv@entry=128) at src/thread/__timedwait.c:68 #4 0x00007f5fb449d9b1 in __pthread_mutex_timedlock (m=0x7f5fb44e0880 , at=at@entry=0x0) at src/thread/pthread_mutex_timedlock.c:85 #5 0x00007f5fb449d7c0 in __pthread_mutex_lock (m=m@entry=0x7f5fb44e0880 ) at src/thread/pthread_mutex_lock.c:9 #6 0x00007f5fb44a49ff in __libc_exit_fini () at ldso/dynlink.c:1442 #7 0x00007f5fb445b082 in exit (code=0) at src/exit/exit.c:30 #8 0x0000557471c3cf45 in ?? () #9 #10 0x00007f5fb43d3f20 in ?? () from /lib/libssl.so.3 #11 0x00007f5fb44a4a9d in __libc_exit_fini () at ldso/dynlink.c:1453 #12 0x00007f5fb445b082 in exit (code=0) at src/exit/exit.c:30 #13 0x0000557471c3cbe7 in ?? () #14 0x0000557471c3e934 in ?? () #15 0x0000557471c3c2d2 in ?? () #16 0x00007f5fb4462aad in libc_start_main_stage2 (main=0x557471c3b780, argc=13, argv=0x7ffd0641b958) at src/env/__libc_start_main.c:95 #17 0x0000557471c3c31a in ?? () #18 0x000000000000000d in ?? () #19 0x00007ffd0641ce54 in ?? () #20 0x00007ffd0641ce66 in ?? () #21 0x00007ffd0641ce6d in ?? () #22 0x00007ffd0641ce6f in ?? () #23 0x00007ffd0641ce76 in ?? () #24 0x00007ffd0641ce79 in ?? () #25 0x00007ffd0641ce80 in ?? () #26 0x00007ffd0641ce89 in ?? () #27 0x00007ffd0641ce92 in ?? () #28 0x00007ffd0641cea2 in ?? () #29 0x00007ffd0641ceac in ?? () #30 0x00007ffd0641cec6 in ?? () #31 0x00007ffd0641cecd in ?? () #32 0x0000000000000000 in ?? () > in this case you can also look at > > (gdb) disas $rip-40,+80 (gdb) disas $rip-40,+80 Dump of assembler code from 0x7f5fb449c0b5 to 0x7f5fb449c105: 0x00007f5fb449c0b5 <__syscall_cp_c+19>: mov %r9,%r8 0x00007f5fb449c0b8 <__syscall_cp_c+22>: mov %fs:0x0,%rbp 0x00007f5fb449c0c1 <__syscall_cp_c+31>: movzbl 0x40(%rbp),%eax 0x00007f5fb449c0c5 <__syscall_cp_c+35>: mov 0x20(%rsp),%r9 0x00007f5fb449c0ca <__syscall_cp_c+40>: test %eax,%eax 0x00007f5fb449c0cc <__syscall_cp_c+42>: je 0x7f5fb449c0df <__syscall_cp_c+61> 0x00007f5fb449c0ce <__syscall_cp_c+44>: dec %eax 0x00007f5fb449c0d0 <__syscall_cp_c+46>: je 0x7f5fb449c0d8 <__syscall_cp_c+54> 0x00007f5fb449c0d2 <__syscall_cp_c+48>: cmp $0x3,%rbx 0x00007f5fb449c0d6 <__syscall_cp_c+52>: jne 0x7f5fb449c0df <__syscall_cp_c+61> 0x00007f5fb449c0d8 <__syscall_cp_c+54>: mov %rbx,%rax 0x00007f5fb449c0db <__syscall_cp_c+57>: syscall => 0x00007f5fb449c0dd <__syscall_cp_c+59>: jmp 0x7f5fb449c12b <__syscall_cp_c+137> 0x00007f5fb449c0df <__syscall_cp_c+61>: push %r9 0x00007f5fb449c0e1 <__syscall_cp_c+63>: lea 0x3c(%rbp),%rax 0x00007f5fb449c0e5 <__syscall_cp_c+67>: mov %rsi,%rcx 0x00007f5fb449c0e8 <__syscall_cp_c+70>: mov %r10,%r9 0x00007f5fb449c0eb <__syscall_cp_c+73>: push %r8 0x00007f5fb449c0ed <__syscall_cp_c+75>: mov %rbx,%rsi 0x00007f5fb449c0f0 <__syscall_cp_c+78>: mov %rdx,%r8 0x00007f5fb449c0f3 <__syscall_cp_c+81>: mov %rdi,%rdx 0x00007f5fb449c0f6 <__syscall_cp_c+84>: mov %rax,%rdi 0x00007f5fb449c0f9 <__syscall_cp_c+87>: call 0x7f5fb449ef4a <__syscall_cp_asm> 0x00007f5fb449c0fe <__syscall_cp_c+92>: pop %rsi 0x00007f5fb449c0ff <__syscall_cp_c+93>: pop %rdi 0x00007f5fb449c100 <__syscall_cp_c+94>: cmp $0xfffffffffffffffc,%rax 0x00007f5fb449c104 <__syscall_cp_c+98>: jne 0x7f5fb449c12b <__syscall_cp_c+137> End of assembler dump. > (gdb) info reg > (gdb) info reg rax 0xfffffffffffffe00 -512 rbx 0xca 202 rcx 0x7f5fb449c0dd 140049023353053 rdx 0xffffffff80000010 -2147483632 rsi 0x80 128 rdi 0x7f5fb44e0884 140049023633540 rbp 0x7f5fb44e0b48 0x7f5fb44e0b48 rsp 0x7ffd06416680 0x7ffd06416680 r8 0x0 0 r9 0x0 0 r10 0x0 0 r11 0x246 582 r12 0x7f5fb44e0884 140049023633540 r13 0x80 128 r14 0x80 128 r15 0x0 0 rip 0x7f5fb449c0dd 0x7f5fb449c0dd <__syscall_cp_c+59> eflags 0x246 [ PF ZF IF ] cs 0x33 51 ss 0x2b 43 ds 0x0 0 es 0x0 0 fs 0x0 0 gs 0x0 0 > 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) x/4wx $rdi-4 0x7f5fb44e0880 : 0x00000000 0x80000010 0x00000001 0x00000000 > (gdb) info sym $rdi > (gdb) info sym $rdi init_fini_lock + 4 in section .bss of /lib/ld-musl-x86_64.so.1 Thanks for the reply and instruction. Carl