linux-kernel - Re: [PATCH v2] um: Avoid longjmp/setjmp symbol clashes with libpthread.a

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Date:   Sat, 3 Jun 2017 23:36:12 +0200
From:   Richard Weinberger <richard@....at>
To:     Thomas Meyer <thomas@...3r.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     Jeff Dike <jdike@...toit.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "open list:USER-MODE LINUX (UML)" 
        <user-mode-linux-devel@...ts.sourceforge.net>,
        "open list:USER-MODE LINUX (UML)" 
        <user-mode-linux-user@...ts.sourceforge.net>
Subject: Re: [PATCH v2] um: Avoid longjmp/setjmp symbol clashes with
 libpthread.a

Thomas,

Am 03.06.2017 um 23:25 schrieb Thomas Meyer:
> ptrace(PTRACE_CONT, 21664, NULL, SIG_0) = 0
> --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_TRAPPED, si_pid=21664, si_uid=1000, si_status=SIGTRAP, si_utime=0, si_stime=0} ---
> wait4(21664, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGTRAP}], WSTOPPED|__WALL, NULL) = 21664
> ptrace(PTRACE_SETREGS, 21664, NULL, 0x60f7fa20) = 0
> ptrace(PTRACE_CONT, 21664, NULL, SIG_0) = 0
> --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_TRAPPED, si_pid=21664, si_uid=1000, si_status=SIGTRAP, si_utime=0, si_stime=0} ---
> wait4(21664, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGTRAP}], WSTOPPED|__WALL, NULL) = 21664
> ptrace(PTRACE_SETREGS, 21664, NULL, 0xb18bc4e0) = 0 
> ptrace(PTRACE_SETREGSET, 21664, NT_X86_XSTATE, [{iov_base=0xb18bc5b8, iov_len=832}]) = -1 EFAULT (Bad address)
> ioctl(1, TCGETS, {B38400 -opost -isig -icanon -echo ...}) = 0
> 
> don't know why gdb shows errno as 4...

Interesting. This makes much more sense than -EINTR.
I've allocated an i7 machine at $dayjob and hope to be able to able reproduce soon.
Let's gets resolved that mess and apply all the fixes. :-)

Thanks,
//richard