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Message-ID: <20180419025052.nvhcfcigjfuhg34i@wfg-t540p.sh.intel.com> 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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