[Bug 1687004] Re: multipath crash generating core dump

[Rafael David Tinoco]

(gdb) bt
#0  __GI___pthread_mutex_lock (mutex=0x0) at ../nptl/pthread_mutex_lock.c:66
#1  0x00007f48700b606e in flush_logqueue () at log_pthread.c:39
#2  0x00007f48700b611b in log_thread (et=0x0) at log_pthread.c:57
#3  0x00007f4870964184 in start_thread (arg=0x7f4870d8b700) at pthread_create.c:312
#4  0x00007f486fdb537d in __ecvt_r (value=9.532824124368238e-130, ndigit=0, decpt=0x0, sign=0x0, buf=0x7f4870d8b9c0 "\220R\267pH\177", len=139949107623680)
    at efgcvt_r.c:218
#5  0x0000000000000000 in ?? ()
(gdb) frame 3
#3  0x00007f4870964184 in start_thread (arg=0x7f4870d8b700) at pthread_create.c:312
warning: Source file is more recent than executable.
312	      THREAD_SETMEM (pd, result, CALL_THREAD_FCT (pd));
(gdb) ptype pd
type = struct pthread {
    union {
        tcbhead_t header;
        void *__padding[24];
    };
    list_t list;
    pid_t tid;
    pid_t pid;
    void *robust_prev;
    struct robust_list_head robust_head;
    struct _pthread_cleanup_buffer *cleanup;
    struct pthread_unwind_buf *cleanup_jmp_buf;
    int cancelhandling;
    int flags;
    struct pthread_key_data specific_1stblock[32];
    struct pthread_key_data *specific[32];
    _Bool specific_used;
    _Bool report_events;
    _Bool user_stack;
    _Bool stopped_start;
    int parent_cancelhandling;
    int lock;
    int setxid_futex;
    hp_timing_t cpuclock_offset;
    struct pthread *joinid;
    void *result;
    struct sched_param schedparam;
    int schedpolicy;
    void *(*start_routine)(void *);
    void *arg;
    td_eventbuf_t eventbuf;
    struct pthread *nextevent;
    struct _Unwind_Exception exc;
    void *stackblock;
    size_t stackblock_size;
    size_t guardsize;
    size_t reported_guardsize;
    struct priority_protection_data *tpp;
    struct __res_state res;
    char end_padding[];
} *

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https://bugs.launchpad.net/bugs/1687004

Title:
  multipath crash generating core dump

Status in multipath-tools package in Ubuntu:
  In Progress

Bug description:
  It was brought to my attention that:

  multipath-tools: 0.4.9-3ubuntu7.15

  Faced a crash and generated a dump.

  ## multipath (trusty) crashed and its dump shows:

  (gdb) bt full
  #0  __GI___pthread_mutex_lock (mutex=0x0) at ../nptl/pthread_mutex_lock.c:66
          __PRETTY_FUNCTION__ = "__pthread_mutex_lock"
          type = 0
  #1  0x00007f48700b606e in flush_logqueue () at log_pthread.c:39
          empty = 0
  #2  0x00007f48700b611b in log_thread (et=0x0) at log_pthread.c:57
  No locals.
  #3  0x00007f4870964184 in start_thread (arg=0x7f4870d8b700) at pthread_create.c:312
          __res = <optimized out>
          pd = 0x7f4870d8b700
          now = <optimized out>
          unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139949107623680, -3200163692152804016, 0, 0, 139949107624384, 139949107623680, 3244383534590274896, 
                  3244383107817352528}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
          not_first_call = <optimized out>
          pagesize_m1 = <optimized out>
          sp = <optimized out>
          freesize = <optimized out>
          __PRETTY_FUNCTION__ = "start_thread"
  #4  0x00007f486fdb537d in __ecvt_r (value=9.532824124368238e-130, ndigit=0, decpt=0x0, sign=0x0, buf=0x7f4870d8b9c0 "\220R\267pH\177", len=139949107623680)
      at efgcvt_r.c:218
          d = 0
          f = 3.2378592100206092e-319
          exponent = 1893250816
  #5  0x0000000000000000 in ?? ()
  No symbol table info available.

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