Subject: Re: [PATCH v2] um: Avoid longjmp/setjmp symbol clashes with
 libpthread.a
To: Thomas Meyer <thomas@m3y3r.de>,
        Florian Fainelli <f.fainelli@gmail.com>, linux-kernel@vger.kernel.org
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Cc: Jeff Dike <jdike@addtoit.com>, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@kernel.org>,
        "open list:USER-MODE LINUX (UML)" 
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        "open list:USER-MODE LINUX (UML)" 
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From: Richard Weinberger <richard@nod.at>
Message-ID: <38b531f3-8a67-13be-be29-84c0c46f076d@nod.at>
Date: Sat, 3 Jun 2017 23:36:12 +0200
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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