* [Bug bpf/26109] New: bug when begin probe exits quickly
@ 2020-06-10 23:32 me at serhei dot io
2020-06-11 0:41 ` [Bug bpf/26109] " me at serhei dot io
2020-06-11 0:41 ` me at serhei dot io
0 siblings, 2 replies; 3+ messages in thread
From: me at serhei dot io @ 2020-06-10 23:32 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=26109
Bug ID: 26109
Summary: bug when begin probe exits quickly
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: bpf
Assignee: systemtap at sourceware dot org
Reporter: me at serhei dot io
Target Milestone: ---
if a bpf begin probe sets exit status, the main thread will skip the pause()
call and immediately deallocate global data structures. Then the
perf_event_loop thread will run on the corrupted data and occasionally fail.
Example result is an assertion failure due count_active_cpus() running on
corrupted data.
Could change the main thread to join() instead of detach(), but then all
threads must be modified to listen for exit status including exit status from
begin thread.
I think if the begin probe was running, it wasn't correct to start the
perf_event_loop (or PERF_EVENT_IOC_ENABLE, or any of the procfs threads) in the
first place, as those things logically happen after the begin probe has already
exited. Simply clean up and exit.
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug bpf/26109] bug when begin probe exits quickly
2020-06-10 23:32 [Bug bpf/26109] New: bug when begin probe exits quickly me at serhei dot io
@ 2020-06-11 0:41 ` me at serhei dot io
2020-06-11 0:41 ` me at serhei dot io
1 sibling, 0 replies; 3+ messages in thread
From: me at serhei dot io @ 2020-06-11 0:41 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=26109
--- Comment #1 from Serhei Makarov <me at serhei dot io> ---
fixed 1d63e758149
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug bpf/26109] bug when begin probe exits quickly
2020-06-10 23:32 [Bug bpf/26109] New: bug when begin probe exits quickly me at serhei dot io
2020-06-11 0:41 ` [Bug bpf/26109] " me at serhei dot io
@ 2020-06-11 0:41 ` me at serhei dot io
1 sibling, 0 replies; 3+ messages in thread
From: me at serhei dot io @ 2020-06-11 0:41 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=26109
Serhei Makarov <me at serhei dot io> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Serhei Makarov <me at serhei dot io> ---
really
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2020-06-11 0:41 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-06-10 23:32 [Bug bpf/26109] New: bug when begin probe exits quickly me at serhei dot io
2020-06-11 0:41 ` [Bug bpf/26109] " me at serhei dot io
2020-06-11 0:41 ` me at serhei dot io
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).