[ 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 '10.128.0.42' (ECDSA) to the list of known hosts. 2020/05/28 12:37:16 fuzzer started 2020/05/28 12:37:16 dialing manager at 10.128.0.105:45675 2020/05/28 12:37:18 syscalls: 3055 2020/05/28 12:37:18 code coverage: enabled 2020/05/28 12:37:18 comparison tracing: enabled 2020/05/28 12:37:18 extra coverage: enabled 2020/05/28 12:37:18 setuid sandbox: enabled 2020/05/28 12:37:18 namespace sandbox: enabled 2020/05/28 12:37:18 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/28 12:37:18 fault injection: enabled 2020/05/28 12:37:18 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/28 12:37:18 net packet injection: enabled 2020/05/28 12:37:18 net device setup: enabled 2020/05/28 12:37:18 concurrency sanitizer: enabled 2020/05/28 12:37:18 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/28 12:37:18 USB emulation: enabled 2020/05/28 12:37:18 adding functions to KCSAN blacklist: '__ext4_new_inode' 'echo_char' 'ep_poll' 'blk_mq_dispatch_rq_list' 'find_get_pages_range_tag' 'mod_timer' 'run_timer_softirq' 'page_counter_charge' 'xas_clear_mark' '__send_signal' syzkaller login: [ 56.662739][ C0] ================================================================== [ 56.670881][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 56.678939][ C0] [ 56.681252][ C0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 56.688868][ C0] tick_sched_do_timer+0xb4/0xd0 [ 56.693795][ C0] tick_sched_timer+0x3f/0xd0 [ 56.698451][ C0] __hrtimer_run_queues+0x271/0x600 [ 56.703625][ C0] hrtimer_interrupt+0x226/0x490 [ 56.708540][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 56.713973][ C0] apic_timer_interrupt+0xf/0x20 [ 56.718913][ C0] tick_nohz_idle_exit+0x128/0x1d0 [ 56.724005][ C0] do_idle+0xac/0x290 [ 56.728071][ C0] cpu_startup_entry+0x14/0x20 [ 56.732812][ C0] start_secondary+0x169/0x1b0 [ 56.737553][ C0] secondary_startup_64+0xa4/0xb0 [ 56.742546][ C0] [ 56.744854][ C0] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 56.752378][ C0] tick_sched_do_timer+0x2e/0xd0 [ 56.757395][ C0] tick_sched_timer+0x3f/0xd0 [ 56.762137][ C0] __hrtimer_run_queues+0x271/0x600 [ 56.767309][ C0] hrtimer_interrupt+0x226/0x490 [ 56.772244][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 56.777681][ C0] apic_timer_interrupt+0xf/0x20 [ 56.782611][ C0] [ 56.784916][ C0] Reported by Kernel Concurrency Sanitizer on: [ 56.791081][ C0] CPU: 0 PID: 8882 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 56.799290][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.809343][ C0] ================================================================== [ 56.817393][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 56.823959][ C0] CPU: 0 PID: 8882 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 56.832167][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.842197][ C0] Call Trace: [ 56.845457][ C0] [ 56.848290][ C0] dump_stack+0x11d/0x187 [ 56.852618][ C0] panic+0x210/0x640 [ 56.856502][ C0] ? vprintk_func+0x89/0x13a [ 56.861076][ C0] kcsan_report.cold+0xc/0x1a [ 56.865754][ C0] kcsan_setup_watchpoint+0x3fb/0x440 [ 56.871108][ C0] tick_sched_do_timer+0x2e/0xd0 [ 56.876025][ C0] tick_sched_timer+0x3f/0xd0 [ 56.881462][ C0] __hrtimer_run_queues+0x271/0x600 [ 56.888722][ C0] ? tick_sched_do_timer+0xd0/0xd0 [ 56.894085][ C0] hrtimer_interrupt+0x226/0x490 [ 56.899014][ C0] ? kvm_clock_read+0x14/0x30 [ 56.903685][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 56.909121][ C0] apic_timer_interrupt+0xf/0x20 [ 56.914030][ C0] [ 56.916948][ C0] RIP: 0033:0x668844 [ 56.920841][ C0] Code: e0 44 8b 44 24 24 41 09 c0 48 8d 79 08 48 8b 54 24 60 48 8b 5c 24 38 48 39 df 0f 83 b1 00 00 00 48 89 7c 24 30 44 89 44 24 24 <48> 8b 06 48 8b 4e 08 48 8b 40 20 48 89 0c 24 ff d0 0f b6 44 24 08 [ 56.940891][ C0] RSP: 002b:000000c0000adab8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 56.949301][ C0] RAX: 000000c0003e8028 RBX: 000000000000000f RCX: 000000c0000e2480 [ 56.957686][ C0] RDX: 000000c0003e8028 RSI: 000000c0003e8000 RDI: 000000000000000c [ 56.965634][ C0] RBP: 000000c0000adb00 R08: 0000000000000808 R09: 000000000000001c [ 56.973593][ C0] R10: 00000000000031ce R11: 0000000000000f34 R12: ffffffffffffffff [ 56.981545][ C0] R13: 0000000000001000 R14: 0000000000000002 R15: 0000000000000002 [ 56.990929][ C0] Kernel Offset: disabled [ 56.995350][ C0] Rebooting in 86400 seconds..