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Message-ID: <20180419065349.nga7edte6tudsu5l@wfg-t540p.sh.intel.com>
Date: Thu, 19 Apr 2018 14:53:49 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Matthew Wilcox <mawilcox@...rosoft.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
LKP <lkp@...org>
Subject: Re: [string_selftest_init] watchdog: BUG: soft lockup - CPU#0 stuck
for 23s! [swapper/0:1]
On Thu, Apr 19, 2018 at 08:22:24AM +0200, Geert Uytterhoeven wrote:
>Hi Fengguang,
>
>On Thu, Apr 19, 2018 at 4:50 AM, Fengguang Wu <fengguang.wu@...el.com> wrote:
>> FYI this happens in mainline kernel 4.17.0-rc1.
>> It dates back to v4.14-rc1 , perhaps since the test was introduced.
>>
>> It occurs in 1 out of 1 boots.
>
>I guess the test just takes too long, causing a panic if
>BOOTPARAM_HUNG_TASK_PANIC=y?
That does the trick of saving test time. ;) Another option is to add
cond_resched(), will that be feasible?
Thanks,
Fengguang
>> [ 83.615461] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 246)
>> [ 83.627616] io scheduler noop registered
>> [ 83.634396] io scheduler deadline registered (default)
>> [ 83.643012] io scheduler mq-deadline registered (default)
>> [ 83.652509] io scheduler bfq registered
>> [ 108.580122] watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:1]
>> [ 108.580122] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.17.0-rc1 #210
>> [ 108.580122] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
>> [ 108.580122] RIP: 0010:check_kcov_mode+0x24/0x37:
>> __read_once_size at include/linux/compiler.h:188 (discriminator 1)
>> (inlined by) check_kcov_mode at kernel/kcov.c:69 (discriminator 1)
>> [ 108.580122] RSP: 0000:ffff88000fd43e48 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
>> [ 108.580122] RAX: 0000000000000000 RBX: ffff88000fd3e000 RCX: 0000000000000000
>> [ 108.580122] RDX: 0000000000000000 RSI: ffff88000fd3e000 RDI: 0000000000000002
>> [ 108.580122] RBP: ffffffff853b9f96 R08: 00000000014000c0 R09: 00000000ffffffff
>> [ 108.580122] R10: ffff88000fd3e000 R11: 0000000000000002 R12: ffff88001a6c0458
>> [ 108.580122] R13: 0000000000000011 R14: ffff88001a6c0530 R15: 00000000a1a1a1a1
>> [ 108.580122] FS: 0000000000000000(0000) GS:ffff88001f600000(0000) knlGS:0000000000000000
>> [ 108.580122] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [ 108.580122] CR2: 0000000000000000 CR3: 0000000003c6a000 CR4: 00000000000006b0
>> [ 108.580122] Call Trace:
>> [ 108.580122] __sanitizer_cov_trace_pc+0x2b/0x66:
>> __sanitizer_cov_trace_pc at kernel/kcov.c:101
>> [ 108.580122] string_selftest_init+0x25e/0x5c0:
>> memset32_selftest at lib/test_string.c:60
>> (inlined by) string_selftest_init at lib/test_string.c:124
>> [ 108.580122] ? prandom_reseed+0x52/0x52:
>> string_selftest_init at lib/test_string.c:115
>> [ 108.580122] do_one_initcall+0x18e/0x3df:
>> do_one_initcall at init/main.c:883
>> [ 108.580122] ? check_kcov_mode+0x5/0x37:
>> check_kcov_mode at kernel/kcov.c:60
>> [ 108.580122] ? __sanitizer_cov_trace_pc+0x2b/0x66:
>> __sanitizer_cov_trace_pc at kernel/kcov.c:101
>> [ 108.580122] ? check_kcov_mode+0x5/0x37:
>> check_kcov_mode at kernel/kcov.c:60
>> [ 108.580122] kernel_init_freeable+0x250/0x3a5:
>> do_initcall_level at init/main.c:951
>> (inlined by) do_initcalls at init/main.c:959
>> (inlined by) do_basic_setup at init/main.c:977
>> (inlined by) kernel_init_freeable at init/main.c:1127
>> [ 108.580122] ? rest_init+0x13a/0x13a:
>> kernel_init at init/main.c:1050
>> [ 108.580122] kernel_init+0x17/0x218:
>> kernel_init at init/main.c:1053
>> [ 108.580122] ? rest_init+0x13a/0x13a:
>> kernel_init at init/main.c:1050
>> [ 108.580122] ret_from_fork+0x35/0x40:
>> ret_from_fork at arch/x86/entry/entry_64.S:418
>> [ 108.580122] Code: 41 5c 41 5d 41 5e c3 e8 e8 c6 a3 01 48 ff 05 71 33 fd 04 31 c0 65 8b 15 78 00 e5 7e 81 e2 00 01 1f 00 75 19 48 ff 05 61 33 fd 04 <8b> 86 18 1c 00 00 39 c7 0f 94 c0 48 ff 05 57 33 fd 04 c3 e8 b1
>> [ 108.580122] Kernel panic - not syncing: softlockup: hung tasks
>> [ 108.580122] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G L 4.17.0-rc1 #210
>> [ 108.580122] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
>> [ 108.580122] Call Trace:
>> [ 108.580122] <IRQ>
>> [ 108.580122] dump_stack+0xf3/0x135:
>> __dump_stack at lib/dump_stack.c:77
>> (inlined by) dump_stack at lib/dump_stack.c:113
>> [ 108.580122] panic+0x173/0x440:
>> panic at kernel/panic.c:195
>> [ 108.580122] watchdog_timer_fn+0x343/0x382:
>> watchdog_timer_fn at kernel/watchdog.c:444
>> [ 108.580122] __hrtimer_run_queues+0x2a0/0x4c3:
>> __run_hrtimer at kernel/time/hrtimer.c:1386
>> (inlined by) __hrtimer_run_queues at kernel/time/hrtimer.c:1448
>> [ 108.580122] hrtimer_run_queues+0xcb/0xed:
>> hrtimer_run_queues at kernel/time/hrtimer.c:1621
>> [ 108.580122] run_local_timers+0x2d/0x85:
>> run_local_timers at kernel/time/timer.c:1704
>> [ 108.580122] update_process_times+0x30/0x7e:
>> update_process_times at kernel/time/timer.c:1636
>> [ 108.580122] tick_nohz_handler+0x141/0x19a:
>> tick_sched_handle at kernel/time/tick-sched.c:173
>> (inlined by) tick_nohz_handler at kernel/time/tick-sched.c:1182
>> [ 108.580122] smp_apic_timer_interrupt+0x1a5/0x2c4:
>> local_apic_timer_interrupt at arch/x86/kernel/apic/apic.c:1025
>> (inlined by) smp_apic_timer_interrupt at arch/x86/kernel/apic/apic.c:1050
>> [ 108.580122] apic_timer_interrupt+0xf/0x20:
>> apic_timer_interrupt at arch/x86/entry/entry_64.S:863
>> [ 108.580122] </IRQ>
>> [ 108.580122] RIP: 0010:check_kcov_mode+0x24/0x37:
>> __read_once_size at include/linux/compiler.h:188 (discriminator 1)
>> (inlined by) check_kcov_mode at kernel/kcov.c:69 (discriminator 1)
>> [ 108.580122] RSP: 0000:ffff88000fd43e48 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
>> [ 108.580122] RAX: 0000000000000000 RBX: ffff88000fd3e000 RCX: 0000000000000000
>> [ 108.580122] RDX: 0000000000000000 RSI: ffff88000fd3e000 RDI: 0000000000000002
>> [ 108.580122] RBP: ffffffff853b9f96 R08: 00000000014000c0 R09: 00000000ffffffff
>> [ 108.580122] R10: ffff88000fd3e000 R11: 0000000000000002 R12: ffff88001a6c0458
>> [ 108.580122] R13: 0000000000000011 R14: ffff88001a6c0530 R15: 00000000a1a1a1a1
>> [ 108.580122] ? string_selftest_init+0x25e/0x5c0:
>> memset32_selftest at lib/test_string.c:60
>> (inlined by) string_selftest_init at lib/test_string.c:124
>> [ 108.580122] ? check_kcov_mode+0x5/0x37:
>> check_kcov_mode at kernel/kcov.c:60
>> [ 108.580122] __sanitizer_cov_trace_pc+0x2b/0x66:
>> __sanitizer_cov_trace_pc at kernel/kcov.c:101
>> [ 108.580122] string_selftest_init+0x25e/0x5c0:
>> memset32_selftest at lib/test_string.c:60
>> (inlined by) string_selftest_init at lib/test_string.c:124
>> [ 108.580122] ? prandom_reseed+0x52/0x52:
>> string_selftest_init at lib/test_string.c:115
>> [ 108.580122] do_one_initcall+0x18e/0x3df:
>> do_one_initcall at init/main.c:883
>> [ 108.580122] ? check_kcov_mode+0x5/0x37:
>> check_kcov_mode at kernel/kcov.c:60
>> [ 108.580122] ? __sanitizer_cov_trace_pc+0x2b/0x66:
>> __sanitizer_cov_trace_pc at kernel/kcov.c:101
>> [ 108.580122] ? check_kcov_mode+0x5/0x37:
>> check_kcov_mode at kernel/kcov.c:60
>> [ 108.580122] kernel_init_freeable+0x250/0x3a5:
>> do_initcall_level at init/main.c:951
>> (inlined by) do_initcalls at init/main.c:959
>> (inlined by) do_basic_setup at init/main.c:977
>> (inlined by) kernel_init_freeable at init/main.c:1127
>> [ 108.580122] ? rest_init+0x13a/0x13a:
>> kernel_init at init/main.c:1050
>> [ 108.580122] kernel_init+0x17/0x218:
>> kernel_init at init/main.c:1053
>> [ 108.580122] ? rest_init+0x13a/0x13a:
>> kernel_init at init/main.c:1050
>> [ 108.580122] ret_from_fork+0x35/0x40:
>> ret_from_fork at arch/x86/entry/entry_64.S:418
>> [ 108.580122] Kernel Offset: disabled
>>
>> Attached the full dmesg, kconfig and reproduce scripts.
>
>Gr{oetje,eeting}s,
>
> Geert
>
>--
>Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
>In personal conversations with technical people, I call myself a hacker. But
>when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds
>
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