Revision tags: v5.15.41, v5.15.40, v5.15.39, v5.15.38, v5.15.37, v5.15.36, v5.15.35, v5.15.34, v5.15.33, v5.15.32, v5.15.31, v5.15.30, v5.15.29, v5.15.28, v5.15.27, v5.15.26, v5.15.25, v5.15.24, v5.15.23, v5.15.22, v5.15.21, v5.15.20, v5.15.19, v5.15.18, v5.15.17, v5.4.173, v5.15.16, v5.15.15, v5.15.10, v5.15.9, v5.15.8, v5.15.7, v5.15.6, v5.15.5, v5.15.4, v5.15.3, v5.15.2, v5.15.1, v5.15, v5.14.14, v5.14.13, v5.14.12, v5.14.11, v5.14.10, v5.14.9, v5.14.8, v5.14.7, v5.14.6, v5.10.67, v5.10.66, v5.14.5, v5.14.4, v5.10.65, v5.14.3, v5.10.64, v5.14.2, v5.10.63, v5.14.1, v5.10.62, v5.14, v5.10.61, v5.10.60, v5.10.53, v5.10.52, v5.10.51, v5.10.50, v5.10.49, v5.13, v5.10.46, v5.10.43, v5.10.42, v5.10.41, v5.10.40, v5.10.39, v5.4.119, v5.10.36, v5.10.35 |
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#
1e3b918d |
| 06-May-2021 |
Davidlohr Bueso <dave@stgolabs.net> |
kselftest: introduce new epoll test case
Patch series "fs/epoll: restore user-visible behavior upon event ready".
This series tries to address a change in user visible behavior, reported in https:/
kselftest: introduce new epoll test case
Patch series "fs/epoll: restore user-visible behavior upon event ready".
This series tries to address a change in user visible behavior, reported in https://bugzilla.kernel.org/show_bug.cgi?id=208943.
Epoll does not report an event to all the threads running epoll_wait() on the same epoll descriptor. Unsurprisingly, this was bisected back to 339ddb53d373 (fs/epoll: remove unnecessary wakeups of nested epoll), which has had various problems in the past, beyond only nested epoll usage.
This patch (of 2):
This incorporates the testcase originally reported in:
https://bugzilla.kernel.org/show_bug.cgi?id=208943
Which ensures an event is reported to all threads blocked on the same epoll descriptor, otherwise only a single thread will receive the wakeup once the event become ready.
Link: https://lkml.kernel.org/r/20210405231025.33829-1-dave@stgolabs.net Link: https://lkml.kernel.org/r/20210405231025.33829-2-dave@stgolabs.net Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Cc: Jason Baron <jbaron@akamai.com> Cc: Roman Penyaev <rpenyaev@suse.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Revision tags: v5.10.34, v5.4.116, v5.10.33, v5.12, v5.10.32, v5.10.31, v5.10.30, v5.10.27, v5.10.26, v5.10.25, v5.10.24, v5.10.23, v5.10.22, v5.10.21, v5.10.20, v5.10.19, v5.4.101, v5.10.18, v5.10.17, v5.11, v5.10.16, v5.10.15, v5.10.14 |
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#
e9ce39b5 |
| 18-Dec-2020 |
Willem de Bruijn <willemb@google.com> |
selftests/filesystems: expand epoll with epoll_pwait2
Code coverage for the epoll_pwait2 syscall.
epoll62: Repeat basic test epoll1, but exercising the new syscall. epoll63: Pass a timespec and exe
selftests/filesystems: expand epoll with epoll_pwait2
Code coverage for the epoll_pwait2 syscall.
epoll62: Repeat basic test epoll1, but exercising the new syscall. epoll63: Pass a timespec and exercise the timeout wakeup path.
Link: https://lkml.kernel.org/r/20201121144401.3727659-5-willemdebruijn.kernel@gmail.com Signed-off-by: Willem de Bruijn <willemb@google.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Revision tags: v5.10 |
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#
afabdf33 |
| 01-Nov-2020 |
Soheil Hassas Yeganeh <soheil@google.com> |
epoll: add a selftest for epoll timeout race
Add a test case to ensure an event is observed by at least one poller when an epoll timeout is used.
Signed-off-by: Guantao Liu <guantaol@google.com> Si
epoll: add a selftest for epoll timeout race
Add a test case to ensure an event is observed by at least one poller when an epoll timeout is used.
Signed-off-by: Guantao Liu <guantaol@google.com> Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Khazhismel Kumykov <khazhy@google.com> Acked-by: Willem de Bruijn <willemb@google.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Davidlohr Bueso <dave@stgolabs.net> Link: https://lkml.kernel.org/r/20201028180202.952079-2-soheil.kdev@gmail.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Revision tags: v5.8.17, v5.8.16, v5.8.15, v5.9, v5.8.14, v5.8.13, v5.8.12, v5.8.11, v5.8.10, v5.8.9, v5.8.8, v5.8.7, v5.8.6, v5.4.62, v5.8.5, v5.8.4, v5.4.61, v5.8.3, v5.4.60, v5.8.2, v5.4.59, v5.8.1, v5.4.58, v5.4.57, v5.4.56, v5.8, v5.7.12, v5.4.55, v5.7.11, v5.4.54, v5.7.10, v5.4.53, v5.4.52, v5.7.9, v5.7.8, v5.4.51, v5.4.50, v5.7.7, v5.4.49, v5.7.6, v5.7.5, v5.4.48, v5.7.4, v5.7.3, v5.4.47, v5.4.46, v5.7.2, v5.4.45, v5.7.1, v5.4.44, v5.7, v5.4.43, v5.4.42, v5.4.41, v5.4.40 |
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#
474328c0 |
| 07-May-2020 |
Roman Penyaev <rpenyaev@suse.de> |
kselftests: introduce new epoll60 testcase for catching lost wakeups
This test case catches lost wake up introduced by commit 339ddb53d373 ("fs/epoll: remove unnecessary wakeups of nested epoll")
T
kselftests: introduce new epoll60 testcase for catching lost wakeups
This test case catches lost wake up introduced by commit 339ddb53d373 ("fs/epoll: remove unnecessary wakeups of nested epoll")
The test is simple: we have 10 threads and 10 event fds. Each thread can harvest only 1 event. 1 producer fires all 10 events at once and waits that all 10 events will be observed by 10 threads.
In case of lost wakeup epoll_wait() will timeout and 0 will be returned.
Test case catches two sort of problems: forgotten wakeup on event, which hits the ->ovflist list, this problem was fixed by:
5a2513239750 ("eventpoll: fix missing wakeup for ovflist in ep_poll_callback")
the other problem is when several sequential events hit the same waiting thread, thus other waiters get no wakeups. Problem is fixed in the following patch.
Signed-off-by: Roman Penyaev <rpenyaev@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Khazhismel Kumykov <khazhy@google.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Heiher <r@hev.cc> Cc: Jason Baron <jbaron@akamai.com> Link: http://lkml.kernel.org/r/20200430130326.1368509-1-rpenyaev@suse.de Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Revision tags: v5.4.39, v5.4.38, v5.4.37, v5.4.36, v5.4.35, v5.4.34, v5.4.33, v5.4.32, v5.4.31 |
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#
282144e0 |
| 06-Apr-2020 |
Roman Penyaev <rpenyaev@suse.de> |
kselftest: introduce new epoll test case
This testcase repeats epollbug.c from the bug:
https://bugzilla.kernel.org/show_bug.cgi?id=205933
What it tests? It tests the race between epoll_ctl() a
kselftest: introduce new epoll test case
This testcase repeats epollbug.c from the bug:
https://bugzilla.kernel.org/show_bug.cgi?id=205933
What it tests? It tests the race between epoll_ctl() and epoll_wait(). New event mask passed to epoll_ctl() triggers wake up, which can be missed because of the bug described in the link. Reproduction is 100%, so easy to fix. Kudos, Max, for wonderful test case.
Signed-off-by: Roman Penyaev <rpenyaev@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Max Neunhoeffer <max@arangodb.com> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Christopher Kohlhoff <chris.kohlhoff@clearpool.io> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Jason Baron <jbaron@akamai.com> Cc: Jes Sorensen <jes.sorensen@gmail.com> Link: http://lkml.kernel.org/r/20200214170211.561524-2-rpenyaev@suse.de Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Revision tags: v5.4.30, v5.4.29, v5.6, v5.4.28, v5.4.27, v5.4.26, v5.4.25, v5.4.24, v5.4.23, v5.4.22, v5.4.21, v5.4.20, v5.4.19, v5.4.18, v5.4.17, v5.4.16, v5.5, v5.4.15, v5.4.14, v5.4.13, v5.4.12, v5.4.11, v5.4.10, v5.4.9, v5.4.8, v5.4.7, v5.4.6, v5.4.5, v5.4.4, v5.4.3 |
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#
f2728fe8 |
| 04-Dec-2019 |
Heiher <r@hev.cc> |
selftests: add epoll selftests
This adds the promised selftest for epoll. It will verify the wakeups of epoll. Including leaf and nested mode, epoll_wait() and poll() and multi-threads.
Link: htt
selftests: add epoll selftests
This adds the promised selftest for epoll. It will verify the wakeups of epoll. Including leaf and nested mode, epoll_wait() and poll() and multi-threads.
Link: http://lkml.kernel.org/r/20191009121518.4027-1-r@hev.cc Signed-off-by: hev <r@hev.cc> Reviewed-by: Roman Penyaev <rpenyaev@suse.de> Cc: Jason Baron <jbaron@akamai.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Revision tags: v5.10 |
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#
afabdf33 |
| 01-Nov-2020 |
Soheil Hassas Yeganeh <soheil@google.com> |
epoll: add a selftest for epoll timeout race Add a test case to ensure an event is observed by at least one poller when an epoll timeout is used. Signed-off-by: Guantao Liu <gua
epoll: add a selftest for epoll timeout race Add a test case to ensure an event is observed by at least one poller when an epoll timeout is used. Signed-off-by: Guantao Liu <guantaol@google.com> Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Khazhismel Kumykov <khazhy@google.com> Acked-by: Willem de Bruijn <willemb@google.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Davidlohr Bueso <dave@stgolabs.net> Link: https://lkml.kernel.org/r/20201028180202.952079-2-soheil.kdev@gmail.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Revision tags: v5.8.17, v5.8.16, v5.8.15, v5.9, v5.8.14, v5.8.13, v5.8.12, v5.8.11, v5.8.10, v5.8.9, v5.8.8, v5.8.7, v5.8.6, v5.4.62, v5.8.5, v5.8.4, v5.4.61, v5.8.3, v5.4.60, v5.8.2, v5.4.59, v5.8.1, v5.4.58, v5.4.57, v5.4.56, v5.8, v5.7.12, v5.4.55, v5.7.11, v5.4.54, v5.7.10, v5.4.53, v5.4.52, v5.7.9, v5.7.8, v5.4.51, v5.4.50, v5.7.7, v5.4.49, v5.7.6, v5.7.5, v5.4.48, v5.7.4, v5.7.3, v5.4.47, v5.4.46, v5.7.2, v5.4.45, v5.7.1, v5.4.44, v5.7, v5.4.43, v5.4.42, v5.4.41, v5.4.40 |
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#
474328c0 |
| 07-May-2020 |
Roman Penyaev <rpenyaev@suse.de> |
kselftests: introduce new epoll60 testcase for catching lost wakeups This test case catches lost wake up introduced by commit 339ddb53d373 ("fs/epoll: remove unnecessary wakeups of neste
kselftests: introduce new epoll60 testcase for catching lost wakeups This test case catches lost wake up introduced by commit 339ddb53d373 ("fs/epoll: remove unnecessary wakeups of nested epoll") The test is simple: we have 10 threads and 10 event fds. Each thread can harvest only 1 event. 1 producer fires all 10 events at once and waits that all 10 events will be observed by 10 threads. In case of lost wakeup epoll_wait() will timeout and 0 will be returned. Test case catches two sort of problems: forgotten wakeup on event, which hits the ->ovflist list, this problem was fixed by: 5a2513239750 ("eventpoll: fix missing wakeup for ovflist in ep_poll_callback") the other problem is when several sequential events hit the same waiting thread, thus other waiters get no wakeups. Problem is fixed in the following patch. Signed-off-by: Roman Penyaev <rpenyaev@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Khazhismel Kumykov <khazhy@google.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Heiher <r@hev.cc> Cc: Jason Baron <jbaron@akamai.com> Link: http://lkml.kernel.org/r/20200430130326.1368509-1-rpenyaev@suse.de Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Revision tags: v5.4.39, v5.4.38, v5.4.37, v5.4.36, v5.4.35, v5.4.34, v5.4.33, v5.4.32, v5.4.31 |
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#
282144e0 |
| 06-Apr-2020 |
Roman Penyaev <rpenyaev@suse.de> |
kselftest: introduce new epoll test case This testcase repeats epollbug.c from the bug: https://bugzilla.kernel.org/show_bug.cgi?id=205933 What it tests? It tests the ra
kselftest: introduce new epoll test case This testcase repeats epollbug.c from the bug: https://bugzilla.kernel.org/show_bug.cgi?id=205933 What it tests? It tests the race between epoll_ctl() and epoll_wait(). New event mask passed to epoll_ctl() triggers wake up, which can be missed because of the bug described in the link. Reproduction is 100%, so easy to fix. Kudos, Max, for wonderful test case. Signed-off-by: Roman Penyaev <rpenyaev@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Max Neunhoeffer <max@arangodb.com> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Christopher Kohlhoff <chris.kohlhoff@clearpool.io> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Jason Baron <jbaron@akamai.com> Cc: Jes Sorensen <jes.sorensen@gmail.com> Link: http://lkml.kernel.org/r/20200214170211.561524-2-rpenyaev@suse.de Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Revision tags: v5.4.30, v5.4.29, v5.6, v5.4.28, v5.4.27, v5.4.26, v5.4.25, v5.4.24, v5.4.23, v5.4.22, v5.4.21, v5.4.20, v5.4.19, v5.4.18, v5.4.17, v5.4.16, v5.5, v5.4.15, v5.4.14, v5.4.13, v5.4.12, v5.4.11, v5.4.10, v5.4.9, v5.4.8, v5.4.7, v5.4.6, v5.4.5, v5.4.4, v5.4.3 |
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#
f2728fe8 |
| 04-Dec-2019 |
Heiher <r@hev.cc> |
selftests: add epoll selftests This adds the promised selftest for epoll. It will verify the wakeups of epoll. Including leaf and nested mode, epoll_wait() and poll() and multi-thr
selftests: add epoll selftests This adds the promised selftest for epoll. It will verify the wakeups of epoll. Including leaf and nested mode, epoll_wait() and poll() and multi-threads. Link: http://lkml.kernel.org/r/20191009121518.4027-1-r@hev.cc Signed-off-by: hev <r@hev.cc> Reviewed-by: Roman Penyaev <rpenyaev@suse.de> Cc: Jason Baron <jbaron@akamai.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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