Messages in this thread | | | Subject | Re: [RFC PATCH v1] powerpc: Enable KFENCE for PPC32 | From | Christophe Leroy <> | Date | Tue, 2 Mar 2021 10:27:35 +0100 |
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Le 02/03/2021 à 10:21, Alexander Potapenko a écrit : >> [ 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? >
Booting with 'no_hash_pointers" I get the following. Does it helps ?
[ 16.837198] ================================================================== [ 16.848521] BUG: KFENCE: invalid read in finish_task_switch.isra.0+0x54/0x23c [ 16.848521] [ 16.857158] Invalid read at 0xdf98800a: [ 16.861004] finish_task_switch.isra.0+0x54/0x23c [ 16.865731] kunit_try_run_case+0x5c/0xd0 [ 16.869780] kunit_generic_run_threadfn_adapter+0x24/0x30 [ 16.875199] kthread+0x15c/0x174 [ 16.878460] ret_from_kernel_thread+0x14/0x1c [ 16.882847] [ 16.884351] CPU: 0 PID: 111 Comm: kunit_try_catch Tainted: G B 5.12.0-rc1-s3k-dev-01534-g4f14ae75edf0-dirty #4674 [ 16.895908] NIP: c016eb8c LR: c02f50dc CTR: c016eb38 [ 16.900963] REGS: e2449d90 TRAP: 0301 Tainted: G B (5.12.0-rc1-s3k-dev-01534-g4f14ae75edf0-dirty) [ 16.911386] MSR: 00009032 <EE,ME,IR,DR,RI> CR: 22000004 XER: 00000000 [ 16.918153] DAR: df98800a DSISR: 20000000 [ 16.918153] GPR00: c02f50dc e2449e50 c1140d00 e100dd24 c084b13c 00000008 c084b32b c016eb38 [ 16.918153] GPR08: c0850000 df988000 c0d10000 e2449eb0 22000288 [ 16.936695] NIP [c016eb8c] test_invalid_access+0x54/0x108 [ 16.942125] LR [c02f50dc] kunit_try_run_case+0x5c/0xd0 [ 16.947292] Call Trace: [ 16.949746] [e2449e50] [c005a5ec] finish_task_switch.isra.0+0x54/0x23c (unreliable) [ 16.957443] [e2449eb0] [c02f50dc] kunit_try_run_case+0x5c/0xd0 [ 16.963319] [e2449ed0] [c02f63ec] kunit_generic_run_threadfn_adapter+0x24/0x30 [ 16.970574] [e2449ef0] [c004e710] kthread+0x15c/0x174 [ 16.975670] [e2449f30] [c001317c] ret_from_kernel_thread+0x14/0x1c [ 16.981896] Instruction dump: [ 16.984879] 8129d608 38e7eb38 81020280 911f004c 39000000 995f0024 907f0028 90ff001c [ 16.992710] 3949000a 915f0020 3d40c0d1 3d00c085 <8929000a> 3908adb0 812a4b98 3d40c02f [ 17.000711] ================================================================== [ 17.008223] # test_invalid_access: EXPECTATION FAILED at mm/kfence/kfence_test.c:636 [ 17.008223] Expected report_matches(&expect) to be true, but is false [ 17.023243] not ok 21 - test_invalid_access
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