kernel/tools/testing/selftests/bpf/progs/timer_lockup.c, branch linux-rolling-stableHosts the 0x221E linux distro kernel.https://universe.0xinfinity.dev/distro/kernel/atom?h=linux-rolling-stable2024-07-11T08:18:31Zselftests/bpf: Add timer lockup selftest2024-07-11T08:18:31ZKumar Kartikeya Dwivedimemxor@gmail.com2024-07-11T05:27:09Zurn:sha1:50bd5a0c658d132507673c4d59347c025dd149ed
Add a selftest that tries to trigger a situation where two timer callbacks
are attempting to cancel each other's timer. By running them continuously,
we hit a condition where both run in parallel and cancel each other.
Without the fix in the previous patch, this would cause a lockup as
hrtimer_cancel on either side will wait for forward progress from the
callback.
Ensure that this situation leads to a EDEADLK error.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240711052709.2148616-1-memxor@gmail.com