409367 2019-07-01 14:11:35 +0000 exit_group() after signal arriving to thread waiting in futex() causes hangs 2019-07-11 20:39:48 +0000 1 1 6 Developer tools valgrind general unspecified Other Linux RESOLVED FIXED NOR normal --- 0 desrt philippe.waroquiers philippe.waroquiers 0 oldest_to_newest 1866543 0 121256 desrt 2019-07-01 14:11:35 +0000 Created attachment 121256 small reproducer If the main thread of a traced program calls exit_group() very soon after a signal is delivered to another thread in the program which happens to be waiting on a futex() then valgrind will start consuming 100% CPU and not exit. Expected: valgrind should exit. I suspect this has something to do with signals interacting with the futex call wrapping because if I replace the futex wait with a normal sleep then everything works properly. Also: if the process waits around a while before it exits, there is also no problem. In order for the problem to occur the program needs to exit quickly. 1866563 1 desrt 2019-07-01 15:13:53 +0000 Forgot to mention: this is against valgrind-3.14.0 as shipped with Ubuntu 19.04. 1866608 2 philippe.waroquiers 2019-07-01 19:40:24 +0000 This looks very similar to a loop reproduced with 409141. 1866810 3 121295 philippe.waroquiers 2019-07-02 20:29:53 +0000 Created attachment 121295 fix hands and loops when process sends signal to itself I have tested with the reproducer attached, and it works. The test added by the patch is similar to this test. If no remark on the approach, I will push in a few days ... 1868208 4 philippe.waroquiers 2019-07-10 22:38:01 +0000 Pushed as 63a9f0793 1868252 5 desrt 2019-07-11 07:41:45 +0000 (In reply to Philippe Waroquiers from comment #4) > Pushed as 63a9f0793 Thanks very much, Philippe. A few questions, if you don't mind: 1) is there any workaround to this problem that you can imagine (in terms of commandline flags, etc.) that void avoid the problem other than to update valgrind to a version that includes this patch? Our current workaround is to add a sleep on the main thread before exit, and I'd like to remove that ASAP. 2) when is this patch likely to appear in a release? when is it likely to appear in a stable release? 3) do you think this patch is suitable for backporting/vendor-patching for distro packages? Thanks again. 1868343 6 philippe.waroquiers 2019-07-11 20:39:48 +0000 (In reply to Allison Karlitskaya from comment #5) > (In reply to Philippe Waroquiers from comment #4) > > Pushed as 63a9f0793 > > Thanks very much, Philippe. > > A few questions, if you don't mind: > > 1) is there any workaround to this problem that you can imagine (in terms of > commandline flags, etc.) that void avoid the problem other than to update > valgrind to a version that includes this patch? Our current workaround is > to add a sleep on the main thread before exit, and I'd like to remove that > ASAP. I do not see a workaround at valgrind command line level. > > 2) when is this patch likely to appear in a release? when is it likely to > appear in a stable release? We only have stable releases :). Typically, there is a release every 6 months or so. The last release was the 12 of April. > > 3) do you think this patch is suitable for backporting/vendor-patching for > distro packages? The patch can for sure be backported, if some distro want to do it. 121256 2019-07-01 14:11:35 +0000 2019-07-01 14:11:35 +0000 small reproducer futex-signal-crash.c text/x-csrc 662 desrt I2RlZmluZSBfR05VX1NPVVJDRQoKI2luY2x1ZGUgPHB0aHJlYWQuaD4KI2luY2x1ZGUgPHN0ZGRl Zi5oPgojaW5jbHVkZSA8c3lzL3NpZ25hbC5oPgojaW5jbHVkZSA8dW5pc3RkLmg+CgojaW5jbHVk ZSA8bGludXgvZnV0ZXguaD4KI2luY2x1ZGUgPHN5cy9zeXNjYWxsLmg+CgpzdGF0aWMgdm9pZCAq Cndvcmtlcl90aHJlYWQgKHZvaWQgKmRhdGEpCnsKICBzaXplX3QgdmFyID0gMDsKCiAgd2hpbGUg KDEpCiAgICAvLyBzbGVlcCAoMSk7ICAgIC8vIGRvaW5nIGEgc2xlZXAgaGVyZSBpbnN0ZWFkIG9m IGZ1dGV4IHdpbGwgY2F1c2UgdGhlIHByb2JsZW0gbm90IHRvIG9jY3VyCiAgICBzeXNjYWxsIChf X05SX2Z1dGV4LCAmdmFyLCAoc2l6ZV90KSBGVVRFWF9XQUlUX1BSSVZBVEUsIChzaXplX3QpIDAs IE5VTEwpOwoKICByZXR1cm4gTlVMTDsKfQoKaW50Cm1haW4gKHZvaWQpCnsKICBwdGhyZWFkX3Qg dGhyZWFkOwoKICBwdGhyZWFkX2NyZWF0ZSAoJnRocmVhZCwgTlVMTCwgd29ya2VyX3RocmVhZCwg TlVMTCk7CgogIHNsZWVwICgxKTsKCiAgcHRocmVhZF9raWxsICh0aHJlYWQsIFNJR1RFUk0pOwoK 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