Bug#800743: linux-perf-4.2: fail to backtrace on __lll_unlock_wake
Package: linux-perf-4.2
Version: 4.2-2
Severity: minor
perf stop to unwind backtrace on __lll_unlock_wake.
steps to reproduce
perf record -e syscalls:sys_enter_futex -e syscalls:sys_exit_futex --call-graph dwarf -a -e cycles
<some activity in application with mutex contension here>
perf report -n --sort comm | less
result:
backtrace stopped on __lll_unlock_wake
<<<<<
|
|--69.04%-- __lll_unlock_wake
| _L_unlock_554
|
|--24.32%-- __lll_lock_wait
| _L_lock_909
|
>>>>>
expected:
backtrace must continue after __lll_unlock_wake
-- System Information:
Debian Release: 8.2
APT prefers stable
APT policy: (600, 'stable'), (599, 'unstable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.2.0 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages linux-perf-4.2 depends on:
ii libaudit1 1:2.4-1+b1
ii libc6 2.19-18+deb8u1
ii libc6-i386 2.19-18+deb8u1
ii libc6-x32 2.19-18+deb8u1
ii libdw1 0.159-4.2
ii libelf1 0.159-4.2
ii libnuma1 2.0.10-1
ii libperl5.20 5.20.2-3+deb8u1
ii libpython2.7 2.7.9-2
ii libslang2 2.3.0-2
ii libunwind8 1.1-4
ii zlib1g 1:1.2.8.dfsg-2+b1
Versions of packages linux-perf-4.2 recommends:
ii linux-base 3.5
Versions of packages linux-perf-4.2 suggests:
pn linux-doc-4.2 <none>
-- no debconf information
--
with best regards // pub 1024D/E99AF373 <pgp.mit.edu>
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