From: Alexander Potapenko <glider@google.com>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Marco Elver <elver@google.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Dmitry Vyukov <dvyukov@google.com>,
LKML <linux-kernel@vger.kernel.org>,
linuxppc-dev@lists.ozlabs.org,
kasan-dev <kasan-dev@googlegroups.com>
Subject: Re: [RFC PATCH v1] powerpc: Enable KFENCE for PPC32
Date: Tue, 2 Mar 2021 10:21:02 +0100 [thread overview]
Message-ID: <CAG_fn=WFffkVzqC9b6pyNuweFhFswZfa8RRio2nL9-Wq10nBbw@mail.gmail.com> (raw)
In-Reply-To: <b9dc8d35-a3b0-261a-b1a4-5f4d33406095@csgroup.eu>
> [ 14.998426] BUG: KFENCE: invalid read in finish_task_switch.isra.0+0x54/0x23c
> [ 14.998426]
> [ 15.007061] Invalid read at 0x(ptrval):
> [ 15.010906] finish_task_switch.isra.0+0x54/0x23c
> [ 15.015633] kunit_try_run_case+0x5c/0xd0
> [ 15.019682] kunit_generic_run_threadfn_adapter+0x24/0x30
> [ 15.025099] kthread+0x15c/0x174
> [ 15.028359] ret_from_kernel_thread+0x14/0x1c
> [ 15.032747]
> [ 15.034251] CPU: 0 PID: 111 Comm: kunit_try_catch Tainted: G B
> 5.12.0-rc1-s3k-dev-01534-g4f14ae75edf0-dirty #4674
> [ 15.045811] ==================================================================
> [ 15.053324] # test_invalid_access: EXPECTATION FAILED at mm/kfence/kfence_test.c:636
> [ 15.053324] Expected report_matches(&expect) to be true, but is false
> [ 15.068359] not ok 21 - test_invalid_access
The test expects the function name to be test_invalid_access, i. e.
the first line should be "BUG: KFENCE: invalid read in
test_invalid_access".
The error reporting function unwinds the stack, skips a couple of
"uninteresting" frames
(https://elixir.bootlin.com/linux/v5.12-rc1/source/mm/kfence/report.c#L43)
and uses the first "interesting" one frame to print the report header
(https://elixir.bootlin.com/linux/v5.12-rc1/source/mm/kfence/report.c#L226).
It's strange that test_invalid_access is missing altogether from the
stack trace - is that expected?
Can you try printing the whole stacktrace without skipping any frames
to see if that function is there?
next prev parent reply other threads:[~2021-03-02 10:01 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 8:37 [RFC PATCH v1] powerpc: Enable KFENCE for PPC32 Christophe Leroy
2021-03-02 8:58 ` Marco Elver
2021-03-02 9:05 ` Christophe Leroy
2021-03-02 9:21 ` Alexander Potapenko [this message]
2021-03-02 9:27 ` Christophe Leroy
2021-03-02 9:53 ` Marco Elver
2021-03-02 11:21 ` Christophe Leroy
2021-03-02 11:39 ` Marco Elver
2021-03-03 10:38 ` Christophe Leroy
2021-03-03 10:56 ` Marco Elver
2021-03-04 11:23 ` Christophe Leroy
2021-03-04 11:31 ` Marco Elver
2021-03-04 11:48 ` Christophe Leroy
2021-03-04 12:00 ` Christophe Leroy
2021-03-04 12:02 ` Marco Elver
2021-03-04 12:48 ` Marco Elver
2021-03-04 14:08 ` Christophe Leroy
2021-03-04 14:19 ` Marco Elver
2021-03-05 5:01 ` Michael Ellerman
2021-03-05 7:50 ` Marco Elver
2021-03-05 8:23 ` Christophe Leroy
2021-03-05 9:14 ` Marco Elver
2021-03-05 11:49 ` Michael Ellerman
2021-03-05 13:46 ` Marco Elver
2021-03-02 11:40 ` Michael Ellerman
2021-03-02 18:48 ` Segher Boessenkool
2021-03-03 10:28 ` Christophe Leroy
2021-03-03 10:31 ` Christophe Leroy
2021-03-03 10:39 ` Marco Elver
2021-03-03 10:56 ` Christophe Leroy
[not found] ` <CANpmjNMKEObjf=WyfDQB5vPmR5RuyUMBJyfr6P2ykCd67wyMbA__49537.1361424745$1614767987$gmane$org@mail.gmail.com>
2021-03-03 10:46 ` Andreas Schwab
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