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Date:   Thu, 19 Apr 2018 10:50:52 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     linux-kernel@...r.kernel.org, lkp@...org
Subject: [string_selftest_init] watchdog: BUG: soft lockup - CPU#0 stuck for
 23s! [swapper/0:1]

Hi Geert,

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.

[   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.

Thanks,
Fengguang

View attachment "dmesg-vm-lkp-wsx03-yocto-x86_64-27:20180417140300:x86_64-randconfig-s3-04171327:4.17.0-rc1:210" of type "text/plain" (41974 bytes)

View attachment ".config" of type "text/plain" (112437 bytes)

View attachment "job-script" of type "text/plain" (3901 bytes)

View attachment "reproduce-vm-lkp-wsx03-yocto-x86_64-27:20180417140300:x86_64-randconfig-s3-04171327:4.17.0-rc1:210" of type "text/plain" (2107 bytes)

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