[ OK ] Started OpenBSD Secure Shell server. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.193' (ECDSA) to the list of known hosts. 2021/08/23 10:25:51 fuzzer started 2021/08/23 10:25:51 dialing manager at 10.128.0.163:41691 2021/08/23 10:25:53 syscalls: 1973 2021/08/23 10:25:53 code coverage: enabled 2021/08/23 10:25:53 comparison tracing: enabled 2021/08/23 10:25:53 extra coverage: enabled 2021/08/23 10:25:53 setuid sandbox: enabled 2021/08/23 10:25:53 namespace sandbox: enabled 2021/08/23 10:25:53 Android sandbox: enabled 2021/08/23 10:25:53 fault injection: enabled 2021/08/23 10:25:53 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/08/23 10:25:53 net packet injection: /dev/net/tun does not exist 2021/08/23 10:25:53 net device setup: enabled 2021/08/23 10:25:53 concurrency sanitizer: enabled 2021/08/23 10:25:53 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/08/23 10:25:53 USB emulation: /dev/raw-gadget does not exist 2021/08/23 10:25:53 hci packet injection: /dev/vhci does not exist 2021/08/23 10:25:53 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist 2021/08/23 10:25:53 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist 2021/08/23 10:25:54 suppressing KCSAN reports in functions: 'n_tty_receive_buf_common' '__xa_clear_mark' 'blk_mq_dispatch_rq_list' 'xas_clear_mark' 'step_into' 'audit_log_start' 'generic_write_end' 'ext4_free_inodes_count' 'ext4_mb_regular_allocator' 'do_sys_poll' 2021/08/23 10:25:54 fetching corpus: 0, signal 0/2000 (executing program) 2021/08/23 10:25:54 fetching corpus: 50, signal 18892/22488 (executing program) 2021/08/23 10:25:54 fetching corpus: 100, signal 29975/35030 (executing program) 2021/08/23 10:25:54 fetching corpus: 150, signal 35911/42395 (executing program) 2021/08/23 10:25:54 fetching corpus: 200, signal 39913/47821 (executing program) 2021/08/23 10:25:54 fetching corpus: 250, signal 44539/53714 (executing program) 2021/08/23 10:25:54 fetching corpus: 300, signal 49752/60083 (executing program) 2021/08/23 10:25:54 fetching corpus: 350, signal 52312/63940 (executing program) 2021/08/23 10:25:54 fetching corpus: 400, signal 57551/70123 (executing program) 2021/08/23 10:25:55 fetching corpus: 450, signal 59737/73465 (executing program) 2021/08/23 10:25:55 fetching corpus: 500, signal 63073/77816 (executing program) 2021/08/23 10:25:55 fetching corpus: 550, signal 64537/80452 (executing program) 2021/08/23 10:25:55 fetching corpus: 600, signal 66663/83590 (executing program) 2021/08/23 10:25:55 fetching corpus: 650, signal 68793/86697 (executing program) 2021/08/23 10:25:55 fetching corpus: 700, signal 71459/90213 (executing program) 2021/08/23 10:25:55 fetching corpus: 750, signal 73714/93351 (executing program) 2021/08/23 10:25:55 fetching corpus: 800, signal 75301/95828 (executing program) 2021/08/23 10:25:55 fetching corpus: 850, signal 76635/98101 (executing program) 2021/08/23 10:25:55 fetching corpus: 900, signal 78351/100655 (executing program) 2021/08/23 10:25:55 fetching corpus: 950, signal 79769/102956 (executing program) 2021/08/23 10:25:55 fetching corpus: 1000, signal 81070/105114 (executing program) 2021/08/23 10:25:55 fetching corpus: 1050, signal 82831/107659 (executing program) 2021/08/23 10:25:55 fetching corpus: 1099, signal 83862/109601 (executing program) syzkaller login: [ 21.501609][ T0] ================================================================== [ 21.503493][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_timer [ 21.505544][ T0] [ 21.506022][ T0] write to 0xffffffff838c2450 of 4 bytes by interrupt on cpu 1: [ 21.507706][ T0] tick_sched_timer+0x1f5/0x210 [ 21.508425][ T0] __run_hrtimer+0x160/0x480 [ 21.509699][ T0] hrtimer_interrupt+0x380/0xaf0 [ 21.510435][ T0] __sysvec_apic_timer_interrupt+0x6f/0x1c0 [ 21.511965][ T0] sysvec_apic_timer_interrupt+0x64/0x80 [ 21.513334][ T0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 21.514522][ T0] acpi_idle_enter+0x258/0x2e0 [ 21.516178][ T0] cpuidle_enter_state+0x2b6/0x750 [ 21.517833][ T0] cpuidle_enter+0x3c/0x60 [ 21.518499][ T0] do_idle+0x1a3/0x240 [ 21.519678][ T0] cpu_startup_entry+0x15/0x20 [ 21.520498][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 21.521409][ T0] [ 21.522274][ T0] read to 0xffffffff838c2450 of 4 bytes by task 0 on cpu 0: [ 21.529524][ T0] tick_nohz_next_event+0x217/0x300 [ 21.534704][ T0] tick_nohz_get_sleep_length+0x121/0x280 [ 21.540408][ T0] menu_select+0x303/0x1040 [ 21.544898][ T0] cpuidle_select+0x3d/0x50 [ 21.549725][ T0] do_idle+0x16f/0x240 [ 21.553965][ T0] cpu_startup_entry+0x15/0x20 [ 21.558708][ T0] rest_init+0xee/0x100 [ 21.562865][ T0] arch_call_rest_init+0xa/0xb [ 21.567715][ T0] start_kernel+0x5ae/0x633 [ 21.572202][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 21.578113][ T0] [ 21.580560][ T0] value changed: 0xffffffff -> 0x00000001 [ 21.586308][ T0] [ 21.589051][ T0] Reported by Kernel Concurrency Sanitizer on: [ 21.595862][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.14.0-rc7-syzkaller #0 [ 21.604023][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.614095][ T0] ================================================================== 2021/08/23 10:25:56 fetching corpus: 1148, signal 85405/111864 (executing program) 2021/08/23 10:25:56 fetching corpus: 1198, signal 86602/113809 (executing program) 2021/08/23 10:25:56 fetching corpus: 1248, signal 88336/116163 (executing program) 2021/08/23 10:25:56 fetching corpus: 1298, signal 89340/117942 (executing program) 2021/08/23 10:25:56 fetching corpus: 1348, signal 90362/119657 (executing program) 2021/08/23 10:25:56 fetching corpus: 1398, signal 91562/121570 (executing program) 2021/08/23 10:25:56 fetching corpus: 1448, signal 92543/123234 (executing program) 2021/08/23 10:25:56 fetching corpus: 1497, signal 93695/125072 (executing program) 2021/08/23 10:25:56 fetching corpus: 1547, signal 95403/127214 (executing program) 2021/08/23 10:25:56 fetching corpus: 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