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<
agentzh >
*can easily run
00:42
<
agentzh >
100% reproducible on my side (fedora 28)
00:42
<
agentzh >
the clone syscall indeed may interfere with the real quiesce callback under load.
00:46
<
agentzh >
the test program has to fork a lot.
00:46
<
agentzh >
the more it forks in parallel, the easier it can reproduce the problem.
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<
agentzh >
here i set 1000 parallel forks.
00:46
<
agentzh >
500 should be good enough.
00:47
<
agentzh >
for N < 100 it is hard to reproduce.
00:47
<
agentzh >
the expected behavior is to print out "Hit" and then quit.
00:48
<
agentzh >
but it will hang without any output.
00:48
<
agentzh >
the staprun command, i mean.
01:35
<
fche >
is that a 5 megaton fork bomb or a 50 megaton fork bomb ? :-)
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12:56
<
modem >
fche: the probe are always running on the same cpu than the hooked function is
12:56
<
modem >
fche: but i was indeed switching CPU to swapper kernel thread because of a rcu_callback()
12:57
<
modem >
fche: systemtap ain't involved or messing with normal flow execution, that's entirely logical on my side because of how rcu executed
12:57
<
modem >
thanks ! sorry for no-op talking
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17:23
<
agentzh >
fche: never mind, my example above cannot reproduce the Sl+ hang. my shell cmds messed things up. sorry.
17:24
<
agentzh >
will continue digging the real fuzzing test process.
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