[Bug 172311] Re: internal-error: unknown ptrace event 5

[Matthias Klose]

closing this issue; please recheck with gdb in 14.04 LTS and 14.10. Feel
free to re-open the issue if the problem persists.

** Changed in: gdb (Ubuntu)
       Status: Triaged => Invalid

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Title:
  internal-error: unknown ptrace event 5

Status in GNU Debugger:
  New
Status in “gdb” package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: gdb

  This problem occured while I tried to debug a possible GCC problem.
  For some reason GDB receives an unknown ptrace event as soon as GCC
  crashes.

  The problem seems to be the same as reported in this report (from 2005):
  http://sourceware.org/ml/gdb/2005-05/msg00368.html

  It seems that this problem is reproducable in 100% of the cases (at
  least on my machine).

  The file foo.c used below (to crash GCC) is available at: 
  http://virtual.sysfrog.org/~gst/gccbug/foo.c

  gst at pico:~$ gdb -q gcc
  (no debugging symbols found)
  Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
  (gdb) set follow-fork-mode child
  (gdb) run -Wall -pedantic foo.c
  Starting program: /usr/bin/gcc -Wall -pedantic foo.c
  (no debugging symbols found)
  (no debugging symbols found)
  (no debugging symbols found)
  /build/buildd/gdb-6.6.dfsg/gdb/linux-nat.c:578: internal-error: unknown ptrace event 5
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.
  Quit this debugging session? (y or n) y
  /build/buildd/gdb-6.6.dfsg/gdb/linux-nat.c:578: internal-error: unknown ptrace event 5
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.
  Create a core file of GDB? (y or n) y
  Aborted

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