[ 35.895826][ T25] audit: type=1800 audit(1571794689.082:24): pid=7147 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.549410][ T25] audit: type=1800 audit(1571794689.812:25): pid=7147 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.586128][ T25] audit: type=1800 audit(1571794689.812:26): pid=7147 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.212' (ECDSA) to the list of known hosts. 2019/10/23 01:38:21 fuzzer started 2019/10/23 01:38:23 dialing manager at 10.128.0.105:33369 2019/10/23 01:38:23 syscalls: 2524 2019/10/23 01:38:23 code coverage: enabled 2019/10/23 01:38:23 comparison tracing: enabled 2019/10/23 01:38:23 extra coverage: extra coverage is not supported by the kernel 2019/10/23 01:38:23 setuid sandbox: enabled 2019/10/23 01:38:23 namespace sandbox: enabled 2019/10/23 01:38:23 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/23 01:38:23 fault injection: enabled 2019/10/23 01:38:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/23 01:38:23 net packet injection: enabled 2019/10/23 01:38:23 net device setup: enabled 2019/10/23 01:38:23 concurrency sanitizer: enabled syzkaller login: [ 50.496446][ C0] ================================================================== [ 50.504601][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 50.512642][ C0] [ 50.514959][ C0] read to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 1: [ 50.522579][ C0] tick_sched_do_timer+0x33/0xe0 [ 50.527593][ C0] tick_sched_timer+0x43/0xe0 [ 50.532368][ C0] __hrtimer_run_queues+0x288/0x600 [ 50.537552][ C0] hrtimer_interrupt+0x22a/0x480 [ 50.542562][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 50.548006][ C0] apic_timer_interrupt+0xf/0x20 [ 50.552933][ C0] mem_cgroup_commit_charge+0xc3/0x7d0 [ 50.558393][ C0] wp_page_copy+0x830/0x1160 [ 50.562970][ C0] do_wp_page+0x192/0x11f0 [ 50.567466][ C0] __handle_mm_fault+0x1c07/0x2cb0 [ 50.572663][ C0] handle_mm_fault+0x21b/0x530 [ 50.577416][ C0] __do_page_fault+0x3fb/0x9e0 [ 50.582164][ C0] do_page_fault+0x54/0x233 [ 50.586655][ C0] page_fault+0x34/0x40 [ 50.590787][ C0] [ 50.593103][ C0] write to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 0: [ 50.600718][ C0] tick_sched_do_timer+0xc0/0xe0 [ 50.605644][ C0] tick_sched_timer+0x43/0xe0 [ 50.610307][ C0] __hrtimer_run_queues+0x288/0x600 [ 50.615514][ C0] hrtimer_interrupt+0x22a/0x480 [ 50.620530][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 50.625974][ C0] apic_timer_interrupt+0xf/0x20 [ 50.630906][ C0] [ 50.633399][ C0] Reported by Kernel Concurrency Sanitizer on: [ 50.639629][ C0] CPU: 0 PID: 7304 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.647062][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.657362][ C0] ================================================================== [ 50.665407][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 50.672256][ C0] CPU: 0 PID: 7304 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.679691][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.689729][ C0] Call Trace: [ 50.693171][ C0] [ 50.696030][ C0] dump_stack+0xf5/0x159 [ 50.700266][ C0] panic+0x210/0x640 [ 50.704154][ C0] ? vprintk_func+0x8d/0x140 [ 50.708839][ C0] kcsan_report.cold+0xc/0x10 [ 50.713522][ C0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.719059][ C0] __tsan_write4+0x32/0x40 [ 50.723471][ C0] tick_sched_do_timer+0xc0/0xe0 [ 50.728403][ C0] tick_sched_timer+0x43/0xe0 [ 50.733085][ C0] __hrtimer_run_queues+0x288/0x600 [ 50.738273][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 50.743393][ C0] hrtimer_interrupt+0x22a/0x480 [ 50.748418][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 50.753866][ C0] ? smp_call_function_single_interrupt+0x80/0x1c0 [ 50.760355][ C0] apic_timer_interrupt+0xf/0x20 [ 50.765272][ C0] [ 50.768196][ C0] RIP: 0033:0x41e737 [ 50.772086][ C0] Code: f0 45 0f c1 08 41 ff c9 45 85 c9 0f 8d ea 01 00 00 ba 01 00 00 00 f0 41 0f c1 10 31 c0 48 85 c0 0f 84 bb 01 00 00 0f b6 50 64 <80> fa 01 74 0f 44 8b 40 58 41 39 f0 0f 85 11 02 00 00 eb 92 8b 50 [ 50.791675][ C0] RSP: 002b:000000c42016ff48 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 50.800073][ C0] RAX: 00007f88e9fb0390 RBX: 0000000001825968 RCX: 000000c420001200 [ 50.808031][ C0] RDX: 0000000000000001 RSI: 000000000000001c RDI: 0000000001824940 [ 50.815990][ C0] RBP: 000000c42016ffa0 R08: 00000000000000f1 R09: 0000000000000000 [ 50.823950][ C0] R10: 00007f88ea17d480 R11: 0000000000000000 R12: 0000000000000c00 [ 50.832007][ C0] R13: 0000000000000018 R14: 0000000000000057 R15: 0000000000000100 [ 50.841559][ C0] Kernel Offset: disabled [ 50.845884][ C0] Rebooting in 86400 seconds..