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McKenney" , Boqun Feng , Uladzislau Rezki , rcu@vger.kernel.org, David Gow , Rae Moar , linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, Brendan Higgins X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2159; i=vbabka@suse.cz; h=from:subject:message-id; bh=0WnxLPEui3oDtLBzlhAtJkEteadIcsQlNHVOikq11/s=; b=owEBbQGS/pANAwAIAbvgsHXSRYiaAcsmYgBm+mNb5kW6gBMYJomoCQCnVJVj2vq4E+KW7TR+P v9VoTSjjjuJATMEAAEIAB0WIQR7u8hBFZkjSJZITfG74LB10kWImgUCZvpjWwAKCRC74LB10kWI mmuxCACeREhmlg/rNG4s+kT3WJNgk6FnivDPqNnOL4qEeWBIaPwJLleugyX0FkcYNrF03p70/WB pbKNdzte33X1JZ+yutnxQBs0wb59bq0Cy6NJc2h1MRe/zwbNUPZ8T+SrZwg+RzRYF8uOnmi/Evg PrgWiuYKvoo8av4sqAUo0r1nd3bu88M4blrWPVYYbX7ws1PlO+zA/c73XJUGI4TGo8xwfi1gJDr 1Hc6U6Zsx9qCAVg+8sbG7SVeI1SgqHw4mDqc+Mq7lVU+9fO4r5Wky0LH8loHaH7PJadIY5R/sQD FtUOXqUHggLFkJ8XP/N5cwnK9/61pYbheifxulWZWjhzRjNr X-Developer-Key: i=vbabka@suse.cz; a=openpgp; fpr=A940D434992C2E8E99103D50224FA7E7CC82A664 X-Spam-Score: -2.80 X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TAGGED_RCPT(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCPT_COUNT_TWELVE(0.00)[18]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; FREEMAIL_TO(0.00)[linux-foundation.org,linux.com,google.com,linux.dev,gmail.com,vger.kernel.org,kvack.org,suse.cz]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[roeck-us.net,kernel.org,gmail.com,vger.kernel.org,google.com,googlegroups.com,linux.dev]; MID_RHS_MATCH_FROM(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; TO_DN_SOME(0.00)[] X-Spam-Flag: NO X-Spam-Level: Guenter Roeck reports that the new slub kunit tests added by commit 4e1c44b3db79 ("kunit, slub: add test_kfree_rcu() and test_leak_destroy()") cause a lockup on boot on several architectures when the kunit tests are configured to be built-in and not modules. These tests invoke kfree_rcu() and kvfree_rcu_barrier() and boot sequence inspection showed the runner for built-in kunit tests kunit_run_all_tests() is called before setting system_state to SYSTEM_RUNNING and calling rcu_end_inkernel_boot(), so this seems like a likely cause. So while I was unable to reproduce the problem myself, moving the call to kunit_run_all_tests() a bit later in the boot seems to have fixed the lockup problem according to Guenter's limited testing. No kunit tests should be broken by calling the built-in executor a bit later, as when compiled as modules, they are still executed even later than this. Fixes: 4e1c44b3db79 ("kunit, slub: add test_kfree_rcu() and test_leak_destroy()") Reported-by: Guenter Roeck Closes: https://lore.kernel.org/all/6fcb1252-7990-4f0d-8027-5e83f0fb9409@roeck-us.net/ Cc: "Paul E. McKenney" Cc: Boqun Feng Cc: Uladzislau Rezki Cc: rcu@vger.kernel.org Cc: Brendan Higgins Cc: David Gow Cc: Rae Moar Cc: linux-kselftest@vger.kernel.org Cc: kunit-dev@googlegroups.com Signed-off-by: Vlastimil Babka --- init/main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/init/main.c b/init/main.c index c4778edae7972f512d5eefe8400075ac35a70d1c..7890ebb00e84b8bd7bac28923fb1fe571b3e9ee2 100644 --- a/init/main.c +++ b/init/main.c @@ -1489,6 +1489,8 @@ static int __ref kernel_init(void *unused) rcu_end_inkernel_boot(); + kunit_run_all_tests(); + do_sysctl_args(); if (ramdisk_execute_command) { @@ -1579,8 +1581,6 @@ static noinline void __init kernel_init_freeable(void) do_basic_setup(); - kunit_run_all_tests(); - wait_for_initramfs(); console_on_rootfs();