[ OK ] Reached target Login Prompts. [ 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 '10.128.1.56' (ECDSA) to the list of known hosts. 2020/09/21 07:59:09 fuzzer started 2020/09/21 07:59:10 dialing manager at 10.128.0.105:41511 2020/09/21 07:59:10 checking machine... 2020/09/21 07:59:10 checking revisions... 2020/09/21 07:59:10 testing simple program... syzkaller login: [ 31.946942][ T8701] IPVS: ftp: loaded support on port[0] = 21 2020/09/21 07:59:10 building call list... [ 32.024652][ T21] tipc: TX() has been purged, node left! [ 34.243839][ T8689] can: request_module (can-proto-0) failed. [ 34.253467][ T8689] can: request_module (can-proto-0) failed. [ 34.263083][ T8689] can: request_module (can-proto-0) failed. [ 42.108841][ T0] ================================================================== [ 42.116911][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_nohz_stop_tick [ 42.125021][ T0] [ 42.127317][ T0] write to 0xffffffff88164590 of 4 bytes by task 0 on cpu 0: [ 42.134689][ T0] tick_nohz_stop_tick+0xa0/0x440 [ 42.139679][ T0] tick_nohz_idle_stop_tick+0xf2/0x1c0 [ 42.145114][ T0] do_idle+0x1ca/0x2c0 [ 42.149184][ T0] cpu_startup_entry+0x15/0x20 [ 42.153915][ T0] rest_init+0xd8/0xe0 [ 42.157951][ T0] arch_call_rest_init+0xa/0xb [ 42.162712][ T0] start_kernel+0x608/0x6d0 [ 42.167182][ T0] secondary_startup_64+0xa4/0xb0 [ 42.172165][ T0] [ 42.174495][ T0] read to 0xffffffff88164590 of 4 bytes by task 0 on cpu 1: [ 42.181743][ T0] tick_nohz_next_event+0x21d/0x310 [ 42.186967][ T0] tick_nohz_get_sleep_length+0xca/0x140 [ 42.192569][ T0] menu_select+0x328/0x1030 [ 42.197049][ T0] cpuidle_select+0x3d/0x50 [ 42.201518][ T0] do_idle+0x1ae/0x2c0 [ 42.205686][ T0] cpu_startup_entry+0x15/0x20 [ 42.210416][ T0] secondary_startup_64+0xa4/0xb0 [ 42.215401][ T0] [ 42.217726][ T0] Reported by Kernel Concurrency Sanitizer on: [ 42.223847][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.9.0-rc6-syzkaller #0 [ 42.231709][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.241732][ T0] ================================================================== [ 42.249780][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 42.256334][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.9.0-rc6-syzkaller #0 [ 42.264186][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.274205][ T0] Call Trace: [ 42.277462][ T0] dump_stack+0x10f/0x19d [ 42.281759][ T0] panic+0x207/0x64a [ 42.285653][ T0] ? vprintk_emit+0x44a/0x4f0 [ 42.290299][ T0] kcsan_report+0x684/0x690 [ 42.294772][ T0] ? kcsan_setup_watchpoint+0x41e/0x4a0 [ 42.300298][ T0] ? tick_nohz_next_event+0x21d/0x310 [ 42.305635][ T0] ? tick_nohz_get_sleep_length+0xca/0x140 [ 42.311407][ T0] ? menu_select+0x328/0x1030 [ 42.316051][ T0] ? cpuidle_select+0x3d/0x50 [ 42.320693][ T0] ? do_idle+0x1ae/0x2c0 [ 42.324902][ T0] ? cpu_startup_entry+0x15/0x20 [ 42.329808][ T0] ? secondary_startup_64+0xa4/0xb0 [ 42.334982][ T0] kcsan_setup_watchpoint+0x41e/0x4a0 [ 42.340325][ T0] tick_nohz_next_event+0x21d/0x310 [ 42.345490][ T0] tick_nohz_get_sleep_length+0xca/0x140 [ 42.351098][ T0] menu_select+0x328/0x1030 [ 42.355571][ T0] ? debug_smp_processor_id+0x18/0x20 [ 42.360911][ T0] ? debug_smp_processor_id+0x18/0x20 [ 42.366259][ T0] ? tick_nohz_idle_got_tick+0x67/0x80 [ 42.371686][ T0] cpuidle_select+0x3d/0x50 [ 42.376157][ T0] do_idle+0x1ae/0x2c0 [ 42.380204][ T0] cpu_startup_entry+0x15/0x20 [ 42.384934][ T0] secondary_startup_64+0xa4/0xb0 [ 42.391184][ T0] Kernel Offset: disabled [ 42.395600][ T0] Rebooting in 86400 seconds..