diff options
| author | Josh Poimboeuf <[email protected]> | 2017-10-03 08:51:43 -0500 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2017-10-03 19:11:27 +0200 |
| commit | ee213fc72fd67d0988525af501534f4cb924d1e9 (patch) | |
| tree | 707cf46233eba22b0cfaf0468cb2f50787d0d2dd /tools/perf/scripts/python/syscall-counts.py | |
| parent | 9e66317d3c92ddaab330c125dfe9d06eee268aff (diff) | |
kprobes/x86: Set up frame pointer in kprobe trampoline
Richard Weinberger saw an unwinder warning when running bcc's opensnoop:
WARNING: kernel stack frame pointer at ffff99ef4076bea0 in opensnoop:2008 has bad value 0000000000000008
unwind stack type:0 next_sp: (null) mask:0x2 graph_idx:0
...
ffff99ef4076be88: ffff99ef4076bea0 (0xffff99ef4076bea0)
ffff99ef4076be90: ffffffffac442721 (optimized_callback +0x81/0x90)
...
A lockdep stack trace was initiated from inside a kprobe handler, when
the unwinder noticed a bad frame pointer on the stack. The bad frame
pointer is related to the fact that the kprobe optprobe trampoline
doesn't save the frame pointer before calling into optimized_callback().
Reported-and-tested-by: Richard Weinberger <[email protected]>
Signed-off-by: Josh Poimboeuf <[email protected]>
Acked-by: Masami Hiramatsu <[email protected]>
Cc: Ananth N Mavinakayanahalli <[email protected]>
Cc: Anil S Keshavamurthy <[email protected]>
Cc: David S . Miller <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/7aef2f8ecd75c2f505ef9b80490412262cf4a44c.1507038547.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts.py')
0 files changed, 0 insertions, 0 deletions