[Bug 1805154] Re: glibc 2.28-0ubuntu1 ADT test failure with linux 4.19.0-5.6

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On 2018-11-20T21:53:54+00:00 hjl.tools wrote:

Created attachment 279555
A testcase

commit 379d98ddf41344273d9718556f761420f4dc80b3
Author: Alistair Strachan <astrachan at google.com>
Date:   Fri Aug 3 10:39:31 2018 -0700

    x86: vdso: Use $LD instead of $CC to link
    
    The vdso{32,64}.so can fail to link with CC=clang when clang tries to find
    a suitable GCC toolchain to link these libraries with.
    
    /usr/bin/ld: arch/x86/entry/vdso/vclock_gettime.o:
      access beyond end of merged section (782)

breaks i386 vDSO with incorrect unwind info.  The testcase here should
report:

[hjl at gnu-hsw-1 tmp]$ gcc -g -O2 -funwind-tables -m32 foo.c
[hjl at gnu-hsw-1 tmp]$ ./a.out 
Obtained backtrace with 7 functions
Function 0: ./a.out() [0x8049272]
Function 1: linux-gate.so.1(__kernel_sigreturn+0) [0xf7f990b0]
Function 2: linux-gate.so.1(__kernel_vsyscall+0x9) [0xf7f99099]
Function 3: /lib/libc.so.6(__read+0x2b) [0xf7ea72ab]
Function 4: ./a.out() [0x80493a9]
Function 5: ./a.out() [0x80493f3]
Function 6: ./a.out() [0x80493f3]
[hjl at gnu-hsw-1 tmp]$ 

But kernel 4.19 got

[hjl at gnu-cfl-1 tmp]$ ./a.out 
Obtained backtrace with 4 functions
Failure on line 67
[hjl at gnu-cfl-1 tmp]$ 

Revert the commit fixes i386 vDSO.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1805154/comments/0


** Changed in: linux
       Status: Unknown => Confirmed

** Changed in: linux
   Importance: Unknown => Medium

** Changed in: fedora
       Status: Unknown => Confirmed

** Changed in: fedora
   Importance: Unknown => Medium

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https://bugs.launchpad.net/bugs/1805154

Title:
  glibc 2.28-0ubuntu1 ADT test failure with linux 4.19.0-5.6

Status in Linux:
  Confirmed
Status in glibc package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Fix Committed
Status in Fedora:
  Confirmed

Bug description:
  Testing failed on:
      amd64: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-disco-canonical-kernel-team-bootstrap/disco/amd64/g/glibc/20181119_075302_9b2e2@/log.gz
      i386: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-disco-canonical-kernel-team-bootstrap/disco/i386/g/glibc/20181119_064219_9b2e2@/log.gz

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