* [Bug runtime/23435] New: stapbpf transport layer can swallow a message before exit() @ 2018-07-19 17:06 serhei.public at gmail dot com 2018-08-09 14:32 ` [Bug bpf/23435] " me at serhei dot io ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: serhei.public at gmail dot com @ 2018-07-19 17:06 UTC (permalink / raw) To: systemtap https://sourceware.org/bugzilla/show_bug.cgi?id=23435 Bug ID: 23435 Summary: stapbpf transport layer can swallow a message before exit() Product: systemtap Version: unspecified Status: UNCONFIRMED Severity: normal Priority: P2 Component: runtime Assignee: systemtap at sourceware dot org Reporter: serhei.public at gmail dot com Target Milestone: --- In the following test program: probe kernel.function("vfs_read") { printf("a\n"); printf("b\n"); exit() } The stapbpf transport layer will see the following: 0: <tag>a 1: </tag> 2: <tag>b 3: </tag> 4: <tag></tag> Because exit() sets exit_status before stapbpf reads this data, the empty </tag> on line 1 will trigger the program to exit. Similarly, probe kernel.function("vfs_read") { printf(""); printf("b\n"); exit() } will also swallow the second message. -- You are receiving this mail because: You are the assignee for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug bpf/23435] stapbpf transport layer can swallow a message before exit() 2018-07-19 17:06 [Bug runtime/23435] New: stapbpf transport layer can swallow a message before exit() serhei.public at gmail dot com @ 2018-08-09 14:32 ` me at serhei dot io 2018-08-21 21:02 ` serhei.public at gmail dot com ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: me at serhei dot io @ 2018-08-09 14:32 UTC (permalink / raw) To: systemtap https://sourceware.org/bugzilla/show_bug.cgi?id=23435 Serhei Makarov <me at serhei dot io> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |me at serhei dot io Component|runtime |bpf -- You are receiving this mail because: You are the assignee for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug bpf/23435] stapbpf transport layer can swallow a message before exit() 2018-07-19 17:06 [Bug runtime/23435] New: stapbpf transport layer can swallow a message before exit() serhei.public at gmail dot com 2018-08-09 14:32 ` [Bug bpf/23435] " me at serhei dot io @ 2018-08-21 21:02 ` serhei.public at gmail dot com 2018-08-21 21:22 ` me at serhei dot io 2018-10-24 21:18 ` me at serhei dot io 3 siblings, 0 replies; 5+ messages in thread From: serhei.public at gmail dot com @ 2018-08-21 21:02 UTC (permalink / raw) To: systemtap https://sourceware.org/bugzilla/show_bug.cgi?id=23435 --- Comment #1 from Serhei Makarov <serhei.public at gmail dot com> --- Looks like this issue depends on PR22330. Once we have a proper transport framework, we can implement a proper EXIT message instead of multiplexing onto trace_printk() like this. I experimented a bit with having exit() send a (much less likely to occur) non-printing character to make the second testcase work properly, but that introduces more problems than it solves. -- You are receiving this mail because: You are the assignee for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug bpf/23435] stapbpf transport layer can swallow a message before exit() 2018-07-19 17:06 [Bug runtime/23435] New: stapbpf transport layer can swallow a message before exit() serhei.public at gmail dot com 2018-08-09 14:32 ` [Bug bpf/23435] " me at serhei dot io 2018-08-21 21:02 ` serhei.public at gmail dot com @ 2018-08-21 21:22 ` me at serhei dot io 2018-10-24 21:18 ` me at serhei dot io 3 siblings, 0 replies; 5+ messages in thread From: me at serhei dot io @ 2018-08-21 21:22 UTC (permalink / raw) To: systemtap https://sourceware.org/bugzilla/show_bug.cgi?id=23435 Serhei Makarov <me at serhei dot io> changed: What |Removed |Added ---------------------------------------------------------------------------- Depends on| |22330 Referenced Bugs: https://sourceware.org/bugzilla/show_bug.cgi?id=22330 [Bug 22330] bpf: generate printf via event tuples, userspace formatting postprocessing -- You are receiving this mail because: You are the assignee for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug bpf/23435] stapbpf transport layer can swallow a message before exit() 2018-07-19 17:06 [Bug runtime/23435] New: stapbpf transport layer can swallow a message before exit() serhei.public at gmail dot com ` (2 preceding siblings ...) 2018-08-21 21:22 ` me at serhei dot io @ 2018-10-24 21:18 ` me at serhei dot io 3 siblings, 0 replies; 5+ messages in thread From: me at serhei dot io @ 2018-10-24 21:18 UTC (permalink / raw) To: systemtap https://sourceware.org/bugzilla/show_bug.cgi?id=23435 Serhei Makarov <me at serhei dot io> changed: What |Removed |Added ---------------------------------------------------------------------------- Assignee|systemtap at sourceware dot org |me at serhei dot io -- You are receiving this mail because: You are the assignee for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2018-10-24 21:18 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2018-07-19 17:06 [Bug runtime/23435] New: stapbpf transport layer can swallow a message before exit() serhei.public at gmail dot com 2018-08-09 14:32 ` [Bug bpf/23435] " me at serhei dot io 2018-08-21 21:02 ` serhei.public at gmail dot com 2018-08-21 21:22 ` me at serhei dot io 2018-10-24 21:18 ` me at serhei dot io
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