[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.169' (ECDSA) to the list of known hosts. 2020/06/14 00:42:24 fuzzer started 2020/06/14 00:42:24 dialing manager at 10.128.0.105:38693 2020/06/14 00:42:24 syscalls: 3085 2020/06/14 00:42:24 code coverage: enabled 2020/06/14 00:42:24 comparison tracing: enabled 2020/06/14 00:42:24 extra coverage: enabled 2020/06/14 00:42:24 setuid sandbox: enabled 2020/06/14 00:42:24 namespace sandbox: enabled 2020/06/14 00:42:24 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/14 00:42:24 fault injection: enabled 2020/06/14 00:42:24 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/14 00:42:24 net packet injection: enabled 2020/06/14 00:42:24 net device setup: enabled 2020/06/14 00:42:24 concurrency sanitizer: enabled 2020/06/14 00:42:24 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/14 00:42:24 USB emulation: enabled syzkaller login: [ 53.681586][ T8913] KCSAN: could not find function: '_find_next_bit' 2020/06/14 00:42:27 adding functions to KCSAN blacklist: '__ext4_new_inode' 'do_nanosleep' 'blk_mq_get_request' 'find_get_pages_range_tag' 'io_sq_thread' 'ext4_mark_iloc_dirty' 'generic_update_time' '__perf_event_overflow' 'generic_write_end' 'add_timer' '_find_next_bit' 'file_update_time' 'copy_process' 'do_syslog' 'ext4_free_inodes_count' 'blk_mq_dispatch_rq_list' 'run_timer_softirq' 'alloc_pid' 'generic_fillattr' 'page_counter_charge' 'ktime_get_real_seconds' 'dd_has_work' 'filemap_map_pages' 'ep_poll' 'tick_nohz_idle_stop_tick' 'pcpu_alloc' '__send_signal' 'futex_wait_queue_me' 'xas_clear_mark' 'mod_timer' 'blk_mq_sched_dispatch_requests' [ 99.416062][ C1] ================================================================== [ 99.424222][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 99.432451][ C1] [ 99.434792][ C1] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 99.442426][ C1] tick_sched_do_timer+0xb4/0xd0 [ 99.447390][ C1] tick_sched_timer+0x3f/0xd0 [ 99.452081][ C1] __hrtimer_run_queues+0x271/0x600 [ 99.457294][ C1] hrtimer_interrupt+0x226/0x490 [ 99.462252][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 99.467688][ C1] apic_timer_interrupt+0xf/0x20 [ 99.472682][ C1] [ 99.474995][ C1] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 99.483757][ C1] tick_sched_do_timer+0x2e/0xd0 [ 99.489099][ C1] tick_sched_timer+0x3f/0xd0 [ 99.493762][ C1] __hrtimer_run_queues+0x271/0x600 [ 99.498951][ C1] hrtimer_interrupt+0x226/0x490 [ 99.503879][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 99.509315][ C1] apic_timer_interrupt+0xf/0x20 [ 99.514251][ C1] tick_nohz_idle_enter+0xdb/0x100 [ 99.519359][ C1] do_idle+0x38/0x290 [ 99.523320][ C1] cpu_startup_entry+0x14/0x20 [ 99.528179][ C1] start_secondary+0x169/0x1b0 [ 99.532950][ C1] secondary_startup_64+0xa4/0xb0 [ 99.538125][ C1] [ 99.540432][ C1] Reported by Kernel Concurrency Sanitizer on: [ 99.546735][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 99.554616][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.564660][ C1] ================================================================== [ 99.572693][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 99.579286][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 99.587164][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.597194][ C1] Call Trace: [ 99.600470][ C1] [ 99.603320][ C1] dump_stack+0x11d/0x187 [ 99.607641][ C1] panic+0x210/0x640 [ 99.611515][ C1] ? vprintk_func+0x89/0x13a [ 99.616081][ C1] kcsan_report.cold+0xc/0x1a [ 99.620738][ C1] kcsan_setup_watchpoint+0x3fb/0x440 [ 99.626091][ C1] tick_sched_do_timer+0x2e/0xd0 [ 99.631025][ C1] tick_sched_timer+0x3f/0xd0 [ 99.635806][ C1] __hrtimer_run_queues+0x271/0x600 [ 99.641002][ C1] ? tick_sched_do_timer+0xd0/0xd0 [ 99.646123][ C1] hrtimer_interrupt+0x226/0x490 [ 99.651061][ C1] ? kvm_clock_read+0x14/0x30 [ 99.655735][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 99.661171][ C1] apic_timer_interrupt+0xf/0x20 [ 99.666092][ C1] [ 99.669038][ C1] RIP: 0010:tick_nohz_idle_enter+0xdb/0x100 [ 99.675020][ C1] Code: 4b 4c 04 e8 27 5a f5 ff 48 c7 c7 d0 c9 25 87 e8 4b 2f 15 00 48 83 3d d3 31 e6 05 00 74 25 e8 bc 05 07 00 fb 66 0f 1f 44 00 00 <5b> 5d 41 5c e9 ec 1f 15 00 e8 a7 05 07 00 0f 0b e8 a0 05 07 00 0f [ 99.694862][ C1] RSP: 0018:ffffc90000cd3eb8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 99.703272][ C1] RAX: ffff88812b797040 RBX: ffff88812c1202c0 RCX: ffffffff88af0438 [ 99.711317][ C1] RDX: 0000000000000000 RSI: ffffffff813f9804 RDI: ffffffff8725c9d0 [ 99.719273][ C1] RBP: 0000001726765beb R08: 0000000000000000 R09: 0000ffff8725c9d0 [ 99.727242][ C1] R10: 000088812c12030c R11: 0000ffff8725c9d7 R12: ffff88812c12030c [ 99.735206][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 99.743186][ C1] ? tick_nohz_idle_enter+0xd4/0x100 [ 99.748451][ C1] ? tick_nohz_idle_enter+0xd4/0x100 [ 99.753729][ C1] do_idle+0x38/0x290 [ 99.757706][ C1] cpu_startup_entry+0x14/0x20 [ 99.762445][ C1] start_secondary+0x169/0x1b0 [ 99.767205][ C1] secondary_startup_64+0xa4/0xb0 [ 99.773787][ C1] Kernel Offset: disabled [ 99.778121][ C1] Rebooting in 86400 seconds..