From c4fa3c07679790ecafdb3cd0d6d05122ac52a090 Mon Sep 17 00:00:00 2001 From: Filipe Manana Date: Wed, 12 May 2021 16:28:00 +0100 Subject: [PATCH] btrfs/187: fix test failure when using bash 5.0+ with debug enabled When running btrfs/187 with a bash 5.0+ build that has debug enabled, the test fails due to an unexpected warning message from bash: $ ./check btrfs/187 FSTYP -- btrfs PLATFORM -- Linux/x86_64 debian9 5.12.0-rc8-btrfs-next-92 #1 SMP PREEMPT Wed Apr 21 10:36:03 WEST 2021 MKFS_OPTIONS -- /dev/sdc MOUNT_OPTIONS -- /dev/sdc /home/fdmanana/btrfs-tests/scratch_1 btrfs/187 436s ... - output mismatch (see /xfstests/results//btrfs/187.out.bad) --- tests/btrfs/187.out 2020-10-16 23:13:46.550152492 +0100 +++ /xfstests/results//btrfs/187.out.bad 2021-04-27 14:57:02.623941700 +0100 @@ -1,3 +1,4 @@ QA output created by 187 Create a readonly snapshot of 'SCRATCH_MNT' in 'SCRATCH_MNT/snap1' Create a readonly snapshot of 'SCRATCH_MNT' in 'SCRATCH_MNT/snap2' +/xfstests/tests/btrfs/187: line 1: warning: wait_for: recursively setting old_sigint_handler to wait_sigint_handler: running_trap = 16 ... (Run 'diff -u /xfstests/tests/btrfs/187.out /xfstests/results//btrfs/187.out.bad' to see the entire diff) Ran: btrfs/187 Failures: btrfs/187 Failed 1 of 1 tests This is because the process running dedupe_files_loop() executes the 'wait' command in the trap it has setup and very often it receives the SIGTERM signal while it is running the 'wait' command in the while loop of that function - so executing the trap makes bash run 'wait' while it is already running 'wait', triggering the warning message from bash. That warning message was added in bash 5.0 by commit 36f89ff1d8b761 ("SIGINT trap handler SIGINT loop fix"): https://git.savannah.gnu.org/cgit/bash.git/commit/?id=36f89ff1d8b761c815d8993e9833e6357a57fc6b So fix this by making the trap set a local variable named 'stop' to the value 1 and have the loop exit when the local variable 'stop' is 1. Signed-off-by: Filipe Manana Reviewed-by: Boris Burkov Signed-off-by: Eryu Guan --- tests/btrfs/187 | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/tests/btrfs/187 b/tests/btrfs/187 index b2d3e4f0..7da09abd 100755 --- a/tests/btrfs/187 +++ b/tests/btrfs/187 @@ -64,9 +64,19 @@ dedupe_two_files() dedupe_files_loop() { - trap "wait; exit" SIGTERM - - while true; do + local stop=0 + + # Avoid executing 'wait' inside the trap, because when we receive + # SIGTERM we might be already executing the wait command in the while + # loop below. When that is the case, bash 5.0+ with debug enabled prints + # a warning message that makes the test fail due to a mismatch with the + # golden output. That warning message is the following: + # + # warning: wait_for: recursively setting old_sigint_handler to wait_sigint_handler: running_trap = 16 + # + trap "stop=1" SIGTERM + + while [ $stop -eq 0 ]; do for ((i = 1; i <= 5; i++)); do dedupe_two_files & done -- 2.30.2