Can't reproduce anymore. Gerry is this still happening to you?
** Changed in: unity8 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1378788
Title:
[dash] creates and destroys thread repeatedly
Status in unity8 package in Ubuntu:
Incomplete
Bug description:
Running unity8-dash in gdb, I noticed these messages repeating
continually:
[New Thread 0xa69b6450 (LWP 22737)]
[Thread 0xa69b6450 (LWP 22737) exited]
[New Thread 0xa69b6450 (LWP 22740)]
[Thread 0xa69b6450 (LWP 22740) exited]
[New Thread 0xa69b6450 (LWP 22743)]
[Thread 0xa69b6450 (LWP 22743) exited]
[New Thread 0xa69b6450 (LWP 22746)]
[Thread 0xa69b6450 (LWP 22746) exited]
...
Breaking on thread creation:
(gdb) break __pthread_create_2_1
Breakpoint 1, __pthread_create_2_1 (newthread=newthread@entry=0xb1b9a414,
attr=0x2ba330, start_routine=start_routine@entry=0xb5d2dc71
<timer_sigev_thread>, arg=0xadc0e0f0) at pthread_create.c:461
461 pthread_create.c: No such file or directory.
I could get only get this:
(gdb) bt
#0 __pthread_create_2_1 (newthread=newthread@entry=0xb1b9a414,
attr=0x2ba330, start_routine=start_routine@entry=0xb5d2dc71
<timer_sigev_thread>, arg=0xadc0e0f0) at pthread_create.c:461
#1 0xb5d2dc40 in timer_helper_thread (arg=<optimized out>) at
../nptl/sysdeps/unix/sysv/linux/timer_routines.c:126
#2 0xb6092f98 in start_thread (arg=0xb1b9ab40) at pthread_create.c:311
#3 0xb625922c in ?? () at
../ports/sysdeps/unix/sysv/linux/arm/nptl/../clone.S:92 from
/lib/arm-linux-gnueabihf/libc.so.6
Here's the list of current threads:
(gdb) info threads
Id Target Id Frame
48 Thread 0x9ae55450 (LWP 25686) "unity8-dash" __GI___nptl_death_event ()
at events.c:31
39 Thread 0xb2ee0450 (LWP 16847) "Client IO loop" 0xb6259f50 in recvmsg
() at ../sysdeps/unix/syscall-template.S:81
38 Thread 0xb23bc450 (LWP 16850) "arch_worker" Cannot access memory at
address 0x0
0xb4532840 in ?? ()
* 37 Thread 0xb1b9ab40 (LWP 16851) "unity8-dash" __pthread_create_2_1
(newthread=newthread@entry=0xb1b9a414, attr=0x2ba330,
start_routine=start_routine@entry=0xb5d2dc71 <timer_sigev_thread>,
arg=0xadc0e430) at pthread_create.c:461
36 Thread 0xb19ff450 (LWP 16852) "SWD-GPU Job" __libc_do_syscall () at
../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
35 Thread 0xb11ff450 (LWP 16853) "SWD-Frame" __libc_do_syscall () at
../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
34 Thread 0xb09ff450 (LWP 16854) "QQmlThread" 0xb6252aa2 in poll () at
../sysdeps/unix/syscall-template.S:81
33 Thread 0xaefc9450 (LWP 16856) "dconf worker" 0xb6252aa2 in poll () at
../sysdeps/unix/syscall-template.S:81
32 Thread 0xae5ff450 (LWP 16857) "gdbus" 0xb6252aa2 in poll () at
../sysdeps/unix/syscall-template.S:81
31 Thread 0xad3ff450 (LWP 16896) "Qt bearer threa" 0xb6252aa2 in poll ()
at ../sysdeps/unix/syscall-template.S:81
30 Thread 0xacb95450 (LWP 16913) "QThread" __libc_do_syscall () at
../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
29 Thread 0xac395450 (LWP 16915) "QThread" 0xb6252aa2 in poll () at
../sysdeps/unix/syscall-template.S:81
28 Thread 0xabb95450 (LWP 16916) "QProcessManager" 0xb6254992 in select
() at ../sysdeps/unix/syscall-template.S:81
27 Thread 0xaafed450 (LWP 16924) "unity8-dash" 0xb6259712 in epoll_wait
() at ../sysdeps/unix/syscall-template.S:81
26 Thread 0xa98eb450 (LWP 17088) "QQuickPixmapRea" 0xb6252aa2 in poll ()
at ../sysdeps/unix/syscall-template.S:81
25 Thread 0xa8eec450 (LWP 17094) "unity8-dash" 0xb6259712 in epoll_wait
() at ../sysdeps/unix/syscall-template.S:81
24 Thread 0xa86ac450 (LWP 17096) "QSGRenderThread" __libc_do_syscall ()
at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
23 Thread 0xa7eac450 (LWP 17098) "Swap Worker" __libc_do_syscall () at
../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
22 Thread 0xa75f4450 (LWP 18972) "Qt HTTP thread" 0xb6252aa2 in poll ()
at ../sysdeps/unix/syscall-template.S:81
21 Thread 0xa5368450 (LWP 18977) "scopes_ng::Scop" __libc_do_syscall ()
at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
20 Thread 0xa4b68450 (LWP 18978) "scopes_ng::Scop" __libc_do_syscall ()
at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
19 Thread 0xa4368450 (LWP 18979) "scopes_ng::Scop" __libc_do_syscall ()
at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
18 Thread 0xa3b68450 (LWP 18980) "scopes_ng::Scop" __libc_do_syscall ()
at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
17 Thread 0xa3368450 (LWP 18981) "scopes_ng::Scop" __libc_do_syscall ()
at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
16 Thread 0xa2b68450 (LWP 18982) "scopes_ng::Scop" __libc_do_syscall ()
at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
15 Thread 0xa2368450 (LWP 18983) "scopes_ng::Scop" __libc_do_syscall ()
at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
14 Thread 0xa1b68450 (LWP 18984) "scopes_ng::Scop" __libc_do_syscall ()
at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
13 Thread 0xa1368450 (LWP 18985) "scopes_ng::Scop" __libc_do_syscall ()
at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
12 Thread 0xa0b68450 (LWP 18986) "scopes_ng::Scop" __libc_do_syscall ()
at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
11 Thread 0xa0368450 (LWP 18987) "scopes_ng::Scop" __libc_do_syscall ()
at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
10 Thread 0x9fb68450 (LWP 18988) "scopes_ng::Scop" 0xb6259712 in
epoll_wait () at ../sysdeps/unix/syscall-template.S:81
9 Thread 0x9f368450 (LWP 18989) "scopes_ng::Scop" 0xb6259712 in
epoll_wait () at ../sysdeps/unix/syscall-template.S:81
8 Thread 0xa5b68450 (LWP 18990) "unity8-dash" __libc_do_syscall () at
../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
7 Thread 0x9eb68450 (LWP 18991) "unity8-dash" 0xb6252aa2 in poll () at
../sysdeps/unix/syscall-template.S:81
6 Thread 0x9e368450 (LWP 19030) "unity8-dash" __libc_do_syscall () at
../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
5 Thread 0x9db68450 (LWP 19031) "unity8-dash" __libc_do_syscall () at
../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:43
4 Thread 0x9d368450 (LWP 19032) "unity8-dash" 0xb6252aa2 in poll () at
../sysdeps/unix/syscall-template.S:81
3 Thread 0x9cb68450 (LWP 19033) "unity8-dash" 0xb6252aa2 in poll () at
../sysdeps/unix/syscall-template.S:81
2 Thread 0x9c267450 (LWP 19109) "Qt HTTP thread" 0xb6252aa2 in poll ()
at ../sysdeps/unix/syscall-template.S:81
1 Thread 0xb6fda220 (LWP 16845) "unity8-dash" 0xb6252aa2 in poll () at
../sysdeps/unix/syscall-template.S:81
Thread 48 is the newest,
(gdb) thread 48
[Switching to thread 48 (Thread 0x9ae55450 (LWP 25686))]
#0 __GI___nptl_death_event () at events.c:31
31 events.c: No such file or directory.
(gdb) bt
#0 __GI___nptl_death_event () at events.c:31
#1 0xb609312c in start_thread (arg=0x9ae55450) at pthread_create.c:358
#2 0xb625922c in ?? () at
../ports/sysdeps/unix/sysv/linux/arm/nptl/../clone.S:92 from
/lib/arm-linux-gnueabihf/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
Here's a full thread backtrace of the state at new thread spawn:
http://pastebin.ubuntu.com/8520408/
Is something repeatedly creating a timer with a very small timeout?
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