lttng team mailing list archive

[Gerry Boland <1618201@xxxxxxxxxxxxxxxxxx>]

This issue was worked around, but with a far-from-ideal solution

** Also affects: lttng-ust (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: qtmir (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: qtmir (Ubuntu)
       Status: New => Triaged

** Changed in: qtmir (Ubuntu)
   Importance: Undecided => Medium

** Also affects: qtmir
   Importance: Undecided
       Status: New

** Changed in: qtmir
       Status: New => Triaged

** Changed in: qtmir
   Importance: Undecided => Medium

** Branch linked: lp:~dandrader/qtmir/no-lttng-on-tests

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https://bugs.launchpad.net/bugs/1618201

Title:
  deadlock in lttng_ust_init

Status in QtMir:
  Triaged
Status in lttng-ust package in Ubuntu:
  New
Status in qtmir package in Ubuntu:
  Triaged
Status in ust package in Ubuntu:
  New

Bug description:
  Happens when running tests for
  https://code.launchpad.net/~dandrader/qtmir/content-hub-
  clipboard/+merge/303863 by CI.

  This is the backtrace of where it gets stuck:
  #0 0xffffffff in __pthread_mutex_unlock_usercnt (mutex=0xb6fff514 <_rtld_global+1220>, decr=1) at pthread_mutex_unlock.c:51
  #1 0xffffffff in tls_get_addr_tail (ti=0xb637021c, dtv=0xb3757008, the_map=<optimized out>) at dl-tls.c:778
  #2 0xffffffff in lttng_ust_init () at /usr/include/urcu/static/urcu-bp.h:158
  #3 0xffffffff in lttng_ust_init () at lttng-ust-comm.c:369
  #4 0xffffffff in lttng_ust_init () at lttng-ust-comm.c:1481
  #5 0xffffffff in call_init (l=<optimized out>, argc=argc@entry=1, argv=argv@entry=0xbefff3d4, env=env@entry=0xbefff3dc) at dl-init.c:72
  #6 0xffffffff in _dl_init (env=<optimized out>, argv=<optimized out>, argc=<optimized out>, l=<optimized out>) at dl-init.c:30
  #7 0xffffffff in _dl_init (main_map=0xb6fff958, argc=1, argv=0xbefff3d4, env=0xbefff3dc) at dl-init.c:120
  #8 0xffffffff in _dl_start_user () at /lib/ld-linux-armhf.so.3

  It gets stuck during initialization, more specifically, inside
  lttng_fixup_urcu_bp_tls()

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