[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.213' (ECDSA) to the list of known hosts. 2020/05/25 01:28:14 fuzzer started 2020/05/25 01:28:14 dialing manager at 10.128.0.105:37929 2020/05/25 01:28:14 syscalls: 3055 2020/05/25 01:28:14 code coverage: enabled 2020/05/25 01:28:14 comparison tracing: enabled 2020/05/25 01:28:14 extra coverage: enabled 2020/05/25 01:28:14 setuid sandbox: enabled 2020/05/25 01:28:14 namespace sandbox: enabled 2020/05/25 01:28:14 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/25 01:28:14 fault injection: enabled 2020/05/25 01:28:14 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/25 01:28:14 net packet injection: enabled 2020/05/25 01:28:14 net device setup: enabled 2020/05/25 01:28:14 concurrency sanitizer: enabled 2020/05/25 01:28:14 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/25 01:28:14 USB emulation: enabled syzkaller login: [ 52.612142][ T8923] KCSAN: could not find function: '_find_next_bit' 2020/05/25 01:28:17 adding functions to KCSAN blacklist: 'xas_clear_mark' '__snd_rawmidi_transmit_ack' 'tick_nohz_next_event' 'ext4_free_inodes_count' 'shmem_getpage_gfp' 'find_get_pages_range_tag' 'io_sq_thread' '_find_next_bit' 'blk_mq_dispatch_rq_list' 'generic_fillattr' 'copy_process' 'mod_timer' 'ep_poll' 'dd_has_work' 'blk_mq_get_request' 'echo_char' 'blk_mq_sched_dispatch_requests' 'generic_write_end' 'atime_needs_update' '__ext4_new_inode' 'run_timer_softirq' 'page_counter_charge' [ 76.357050][ C0] ================================================================== [ 76.365269][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 76.373311][ C0] [ 76.375623][ C0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 76.383356][ C0] tick_sched_do_timer+0xb4/0xd0 [ 76.388270][ C0] tick_sched_timer+0x3f/0xd0 [ 76.393021][ C0] __hrtimer_run_queues+0x271/0x600 [ 76.398280][ C0] hrtimer_interrupt+0x226/0x490 [ 76.403207][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 76.408749][ C0] apic_timer_interrupt+0xf/0x20 [ 76.413753][ C0] native_safe_halt+0xe/0x10 [ 76.418316][ C0] default_idle+0x21/0x170 [ 76.422718][ C0] do_idle+0x1b7/0x290 [ 76.426771][ C0] cpu_startup_entry+0x14/0x20 [ 76.431519][ C0] start_secondary+0x169/0x1b0 [ 76.436267][ C0] secondary_startup_64+0xa4/0xb0 [ 76.441273][ C0] [ 76.443586][ C0] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 76.451114][ C0] tick_sched_do_timer+0x2e/0xd0 [ 76.456042][ C0] tick_sched_timer+0x3f/0xd0 [ 76.460693][ C0] __hrtimer_run_queues+0x271/0x600 [ 76.466136][ C0] hrtimer_interrupt+0x226/0x490 [ 76.471050][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 76.476483][ C0] apic_timer_interrupt+0xf/0x20 [ 76.481481][ C0] [ 76.483783][ C0] Reported by Kernel Concurrency Sanitizer on: [ 76.489925][ C0] CPU: 0 PID: 8909 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 76.498142][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.508169][ C0] ================================================================== [ 76.516206][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 76.522839][ C0] CPU: 0 PID: 8909 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 76.531156][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.541537][ C0] Call Trace: [ 76.544796][ C0] [ 76.547645][ C0] dump_stack+0x11d/0x187 [ 76.551971][ C0] panic+0x210/0x640 [ 76.555858][ C0] ? vprintk_func+0x89/0x13a [ 76.560460][ C0] kcsan_report.cold+0xc/0x1a [ 76.565132][ C0] kcsan_setup_watchpoint+0x3fb/0x440 [ 76.570565][ C0] tick_sched_do_timer+0x2e/0xd0 [ 76.575503][ C0] tick_sched_timer+0x3f/0xd0 [ 76.580161][ C0] __hrtimer_run_queues+0x271/0x600 [ 76.585340][ C0] ? tick_sched_do_timer+0xd0/0xd0 [ 76.590445][ C0] hrtimer_interrupt+0x226/0x490 [ 76.595362][ C0] ? kvm_clock_read+0x14/0x30 [ 76.600021][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 76.605725][ C0] apic_timer_interrupt+0xf/0x20 [ 76.611023][ C0] [ 76.613958][ C0] RIP: 0033:0x528d48 [ 76.617852][ C0] Code: 24 28 48 89 54 24 30 48 8b 6c 24 08 48 83 c4 10 c3 31 c0 e8 8a 0e f3 ff eb de 48 8b 41 08 48 8b 19 48 39 c2 73 28 0f b6 04 13 <48> ff c2 48 89 51 28 0f b6 d0 48 89 51 48 88 44 24 20 0f 57 c0 0f [ 76.639979][ C0] RSP: 002b:000000c42028fa20 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff13 [ 76.648492][ C0] RAX: 000000000000002d RBX: 000000c4203da000 RCX: 000000c42006e2a0 [ 76.657078][ C0] RDX: 00000000000009aa RSI: 0000000000000005 RDI: 00000000000000a9 [ 76.665121][ C0] RBP: 000000c42028fa28 R08: 000000c420388000 R09: 0000000000000004 [ 76.673163][ C0] R10: 00000000ffffffff R11: 0000000000002d82 R12: 0000000000000010 [ 76.681122][ C0] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 76.690274][ C0] Kernel Offset: disabled [ 76.694592][ C0] Rebooting in 86400 seconds..