linux-kernel - Re: clang-12: tun: Unknown symbol _GLOBAL_OFFSET_TABLE

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Message-ID: <20210222193749.GA2954@24bbad8f3778>
Date:   Mon, 22 Feb 2021 12:37:49 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     clang-built-linux <clang-built-linux@...glegroups.com>,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org, X86 ML <x86@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: clang-12: tun: Unknown symbol _GLOBAL_OFFSET_TABLE_ (err -2)

On Tue, Feb 23, 2021 at 01:01:16AM +0530, Naresh Kamboju wrote:
> Following test regressions reported after upgrade to clang-12 from clang-10.
> Regression detected on Linux mainline and stable-rc 5.4, 5.10 and 5.11.
> 
> qemu-x86_64-clang-12 failed test cases,
>   ltp-containers-tests:
>     * netns_breakns_ip_ipv4_ioctl
>     * netns_breakns_ip_ipv4_netlink
>     * netns_breakns_ip_ipv6_ioctl
>     * netns_breakns_ip_ipv6_netlink
>     * netns_breakns_ns_exec_ipv4_ioctl
>     * netns_breakns_ns_exec_ipv4_netlink
>     * netns_breakns_ns_exec_ipv6_ioctl
>     * netns_breakns_ns_exec_ipv6_netlink
>     * netns_comm_ip_ipv4_ioctl
>     * netns_comm_ip_ipv4_netlink
>     * netns_comm_ip_ipv6_ioctl
>     * netns_comm_ip_ipv6_netlink
>     * netns_comm_ns_exec_ipv4_ioctl
>     * netns_comm_ns_exec_ipv4_netlink
>     * netns_comm_ns_exec_ipv6_ioctl
>     * netns_comm_ns_exec_ipv6_netlink
>     * netns_netlink
> 
> Test error log:
> --------------
> [   19.017163] tun: Unknown symbol _GLOBAL_OFFSET_TABLE_ (err -2)
> open: No such device
> netns_netlink    1  TBROK  :  netns_netlink.c:143: system() failed
> netns_netlink    2  TBROK  :  netns_netlink.c:143: Remaining cases broken
> netns_breakns 1 TINFO: timeout per run is 0h 15m 0s
> [   19.070922] veth: Unknown symbol _GLOBAL_OFFSET_TABLE_ (err -2)
> [   19.095171] veth: Unknown symbol _GLOBAL_OFFSET_TABLE_ (err -2)
> Error: Unknown device type.[   19.101364] ip (751) used greatest stack
> depth: 12088 bytes left
> 
> netns_breakns 1 TBROK: unable to create veth pair devices
> Cannot find device \"veth0\"
> 
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> 
> Full test error log link,
> -------------------------
> https://qa-reports.linaro.org/lkft/linux-stable-rc-linux-5.11.y/build/v5.11-13-g6380656c9227/testrun/4002283/suite/ltp-containers-tests/test/netns_breakns_ip_ipv4_ioctl/log
> https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v5.11-2899-g2c405d1ab8b3/testrun/3994442/suite/ltp-containers-tests/test/netns_breakns_ip_ipv4_ioctl/log
> 
> -- 
> Linaro LKFT
> https://lkft.linaro.org

Thanks for the report. This has been fixed in -next and has a CC for
stable when it is merged into mainline:

https://git.kernel.org/next/linux-next/c/ebfac7b778fac8b0e8e92ec91d0b055f046b4604
https://github.com/ClangBuiltLinux/linux/issues/1250

Cheers,
Nathan