selftests: netdevsim: fix SIGPIPE flake in ethtool-coalesce

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The adaptive-rx and adaptive-tx checks use 'ethtool -c | grep -q' under
'set -o pipefail'. grep -q exits as soon as it finds a match, which can
happen before ethtool finishes writing its output. When that occurs,
ethtool receives SIGPIPE causing (uninformative):

 # selftests: drivers/net/netdevsim: ethtool-coalesce.sh
 # FAILED 1/22 checks
 not ok 1 selftests: drivers/net/netdevsim: ethtool-coalesce.sh # exit=1

This happens on debug kernels in NIPA, ~4% of the time.

Link: https://patch.msgid.link/20260808163416.2456810-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Jakub Kicinski 2026-08-08 09:34:16 -07:00

parent ae2998ab62

commit 4d2cbd620a

1 changed files with 6 additions and 4 deletions

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tools/testing/selftests/drivers/net/netdevsim/ethtool-coalesce.sh

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