Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. [ 43.682305][ T8894] bash (8894) used greatest stack depth: 10848 bytes left Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.204' (ECDSA) to the list of known hosts. 2020/05/30 22:35:29 fuzzer started 2020/05/30 22:35:30 dialing manager at 10.128.0.105:36125 2020/05/30 22:35:30 syscalls: 3055 2020/05/30 22:35:30 code coverage: enabled 2020/05/30 22:35:30 comparison tracing: enabled 2020/05/30 22:35:30 extra coverage: enabled 2020/05/30 22:35:30 setuid sandbox: enabled 2020/05/30 22:35:30 namespace sandbox: enabled 2020/05/30 22:35:30 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/30 22:35:30 fault injection: enabled 2020/05/30 22:35:30 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/30 22:35:30 net packet injection: enabled 2020/05/30 22:35:30 net device setup: enabled 2020/05/30 22:35:30 concurrency sanitizer: enabled 2020/05/30 22:35:30 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/30 22:35:30 USB emulation: enabled syzkaller login: [ 52.073738][ T8930] KCSAN: could not find function: '_find_next_bit' 2020/05/30 22:35:35 adding functions to KCSAN blacklist: 'do_syslog' 'snd_pcm_oss_change_params_locked' '_find_next_bit' 'generic_write_end' 'find_get_pages_range_tag' 'ext4_mb_good_group' 'other_inode_match' '__x64_sys_ptrace' '__ext4_new_inode' 'echo_char' '__get_user_pages' 'n_tty_receive_buf_common' 'blk_mq_dispatch_rq_list' 'copy_process' 'do_exit' 'generic_fillattr' 'decrypt_packet' 'tick_sched_do_timer' 'blk_mq_get_request' 'atime_needs_update' 'ktime_get_real_seconds' 'pipe_double_lock' 'add_timer' 'fasync_remove_entry' 'kauditd_thread' 'pcpu_alloc' 'ext4_free_inodes_count' 'file_update_time' '__splice_from_pipe' 'mod_timer' 'ep_poll' 'futex_wait_queue_me' 'page_counter_charge' 'do_nanosleep' 'blk_mq_sched_dispatch_requests' 'tick_nohz_idle_stop_tick' 'xas_clear_mark' 'do_wait' '__bpf_lru_node_move_in' '__add_to_page_cache_locked' 'tick_nohz_next_event' '__writeback_single_inode' 'ext4_mark_iloc_dirty' 'audit_log_start' 'run_timer_softirq' [ 132.255130][ C1] ================================================================== [ 132.263294][ C1] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0 [ 132.271707][ C1] [ 132.274010][ C1] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0: [ 132.281355][ C1] timer_clear_idle+0x3d/0x50 [ 132.286006][ C1] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 132.291873][ C1] tick_nohz_idle_exit+0x19c/0x1d0 [ 132.296958][ C1] do_idle+0xac/0x290 [ 132.300912][ C1] cpu_startup_entry+0x14/0x20 [ 132.305647][ C1] rest_init+0xe4/0xeb [ 132.309687][ C1] arch_call_rest_init+0x13/0x2b [ 132.314594][ C1] start_kernel+0x7fe/0x823 [ 132.319067][ C1] secondary_startup_64+0xa4/0xb0 [ 132.324053][ C1] [ 132.326369][ C1] read to 0xffff88812c01dca4 of 1 bytes by interrupt on cpu 1: [ 132.333884][ C1] trigger_dyntick_cpu.isra.0+0x6d/0xf0 [ 132.339401][ C1] add_timer_on+0x192/0x2c0 [ 132.343875][ C1] clocksource_watchdog+0x699/0x7c0 [ 132.349087][ C1] call_timer_fn+0x58/0x2e0 [ 132.353563][ C1] run_timer_softirq+0xb14/0xbd0 [ 132.358474][ C1] __do_softirq+0x118/0x34a [ 132.362947][ C1] irq_exit+0xb5/0xd0 [ 132.366911][ C1] smp_apic_timer_interrupt+0xe2/0x270 [ 132.372342][ C1] apic_timer_interrupt+0xf/0x20 [ 132.377254][ C1] [ 132.379553][ C1] Reported by Kernel Concurrency Sanitizer on: [ 132.385678][ C1] CPU: 1 PID: 8918 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 132.393889][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 132.403913][ C1] ================================================================== [ 132.411945][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 132.418502][ C1] CPU: 1 PID: 8918 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 132.426707][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 132.436734][ C1] Call Trace: [ 132.440001][ C1] [ 132.442833][ C1] dump_stack+0x11d/0x187 [ 132.447149][ C1] panic+0x210/0x640 [ 132.451020][ C1] ? vprintk_func+0x89/0x13a [ 132.455585][ C1] kcsan_report.cold+0xc/0x1a [ 132.460241][ C1] kcsan_setup_watchpoint+0x3fb/0x440 [ 132.465591][ C1] trigger_dyntick_cpu.isra.0+0x6d/0xf0 [ 132.471109][ C1] add_timer_on+0x192/0x2c0 [ 132.475588][ C1] clocksource_watchdog+0x699/0x7c0 [ 132.480761][ C1] ? clocksource_select_watchdog+0x410/0x410 [ 132.486712][ C1] ? clocksource_select_watchdog+0x410/0x410 [ 132.492666][ C1] call_timer_fn+0x58/0x2e0 [ 132.497144][ C1] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 132.503021][ C1] ? clocksource_select_watchdog+0x410/0x410 [ 132.508974][ C1] run_timer_softirq+0xb14/0xbd0 [ 132.513900][ C1] ? kvm_clock_read+0x14/0x30 [ 132.518560][ C1] ? kvm_sched_clock_read+0x5/0x10 [ 132.523653][ C1] ? sched_clock+0xf/0x20 [ 132.527954][ C1] ? sched_clock_cpu+0x10/0xd0 [ 132.532693][ C1] __do_softirq+0x118/0x34a [ 132.537172][ C1] irq_exit+0xb5/0xd0 [ 132.541139][ C1] smp_apic_timer_interrupt+0xe2/0x270 [ 132.546571][ C1] apic_timer_interrupt+0xf/0x20 [ 132.551474][ C1] [ 132.554386][ C1] RIP: 0033:0x494a47 [ 132.558258][ C1] Code: 48 83 f8 17 75 66 48 8b 44 24 40 48 8b 54 24 30 48 39 42 08 0f 86 14 01 00 00 48 8b 5c 24 28 48 8b 5b 30 48 8b 33 48 0f af c6 <48> 03 02 0f b6 53 17 48 89 5c 24 48 48 89 44 24 50 48 f7 c1 60 00 [ 132.577832][ C1] RSP: 002b:000000c0002255c0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 132.586311][ C1] RAX: 000000000000031f RBX: 000000000086e860 RCX: 0000000000000197 [ 132.594254][ C1] RDX: 000000c0020f8ac0 RSI: 0000000000000001 RDI: 000000c0020f8ac0 [ 132.602196][ C1] RBP: 000000c0002255d8 R08: 000000000000031f R09: 000000c000143298 [ 132.610139][ C1] R10: 000000000008c920 R11: 0000000000000074 R12: 00000000000000f4 [ 132.618092][ C1] R13: 0000000000000000 R14: 0000000000ab4b11 R15: 0000000000000000 [ 133.692723][ C1] Shutting down cpus with NMI [ 133.698632][ C1] Kernel Offset: disabled [ 133.702947][ C1] Rebooting in 86400 seconds..