[ 35.579513][ T25] audit: type=1800 audit(1571013217.808:25): pid=7098 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.631132][ T25] audit: type=1800 audit(1571013217.808:26): pid=7098 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.652650][ T25] audit: type=1800 audit(1571013217.818:27): pid=7098 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 36.033179][ T7163] sshd (7163) used greatest stack depth: 10032 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.190' (ECDSA) to the list of known hosts. 2019/10/14 00:33:45 fuzzer started 2019/10/14 00:33:46 dialing manager at 10.128.0.105:40973 2019/10/14 00:33:46 syscalls: 2523 2019/10/14 00:33:46 code coverage: enabled 2019/10/14 00:33:46 comparison tracing: enabled 2019/10/14 00:33:46 extra coverage: extra coverage is not supported by the kernel 2019/10/14 00:33:46 setuid sandbox: enabled 2019/10/14 00:33:46 namespace sandbox: enabled 2019/10/14 00:33:46 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 00:33:46 fault injection: enabled 2019/10/14 00:33:46 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 00:33:46 net packet injection: enabled 2019/10/14 00:33:46 net device setup: enabled 2019/10/14 00:33:46 concurrency sanitizer: enabled syzkaller login: [ 44.822587][ C1] ================================================================== [ 44.831086][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 44.839317][ C1] [ 44.841634][ C1] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 44.849700][ C1] tick_sched_do_timer+0x33/0xe0 [ 44.854704][ C1] tick_sched_timer+0x43/0xe0 [ 44.859364][ C1] __hrtimer_run_queues+0x288/0x600 [ 44.864557][ C1] hrtimer_interrupt+0x22a/0x480 [ 44.870101][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 44.875558][ C1] apic_timer_interrupt+0xf/0x20 [ 44.880500][ C1] __kcsan_setup_watchpoint+0xa/0x510 [ 44.885860][ C1] __tsan_read2+0x2c/0x30 [ 44.890166][ C1] dev_gro_receive+0xb5f/0x1190 [ 44.894991][ C1] napi_gro_receive+0x7c/0x330 [ 44.899734][ C1] receive_buf+0x284/0x30b0 [ 44.904227][ C1] virtnet_poll+0x436/0x7d0 [ 44.908704][ C1] net_rx_action+0x3ae/0xa50 [ 44.913285][ C1] __do_softirq+0x115/0x33f [ 44.917766][ C1] [ 44.920087][ C1] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 44.927713][ C1] tick_sched_do_timer+0xc0/0xe0 [ 44.932730][ C1] tick_sched_timer+0x43/0xe0 [ 44.937386][ C1] __hrtimer_run_queues+0x288/0x600 [ 44.942570][ C1] hrtimer_interrupt+0x22a/0x480 [ 44.947486][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 44.952953][ C1] apic_timer_interrupt+0xf/0x20 [ 44.957863][ C1] [ 44.960171][ C1] Reported by Kernel Concurrency Sanitizer on: [ 44.966402][ C1] CPU: 1 PID: 7246 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 44.973484][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.983519][ C1] ================================================================== [ 44.991644][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 44.998208][ C1] CPU: 1 PID: 7246 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.005289][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.015338][ C1] Call Trace: [ 45.018598][ C1] [ 45.021442][ C1] dump_stack+0xf5/0x159 [ 45.025664][ C1] panic+0x209/0x639 [ 45.029539][ C1] ? vprintk_func+0x8d/0x140 [ 45.034109][ C1] kcsan_report.cold+0xc/0x1b [ 45.038773][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.044306][ C1] __tsan_write4+0x32/0x40 [ 45.048787][ C1] tick_sched_do_timer+0xc0/0xe0 [ 45.053713][ C1] tick_sched_timer+0x43/0xe0 [ 45.058459][ C1] __hrtimer_run_queues+0x288/0x600 [ 45.063639][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 45.068732][ C1] hrtimer_interrupt+0x22a/0x480 [ 45.073745][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 45.079184][ C1] apic_timer_interrupt+0xf/0x20 [ 45.084959][ C1] [ 45.087881][ C1] RIP: 0033:0x45a44c [ 45.091766][ C1] Code: 7c 24 08 48 8b 74 24 10 48 8b 5c 24 18 48 85 db 0f 84 f1 00 00 00 48 83 fb 02 0f 86 da 00 00 00 48 83 fb 04 0f 86 de 00 00 00 <48> 83 fb 08 0f 82 ec 00 00 00 0f 84 f3 00 00 00 48 83 fb 10 0f 86 [ 45.111904][ C1] RSP: 002b:000000c4203bdab0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 45.120303][ C1] RAX: 0000000000000005 RBX: 0000000000000005 RCX: 000000c420310000 [ 45.128273][ C1] RDX: 000000c420311088 RSI: 000000c4204b8db9 RDI: 000000c4204b8f58 [ 45.136230][ C1] RBP: 000000c4203bdb50 R08: 0000000000004db9 R09: 000000c4204b8db9 [ 45.144284][ C1] R10: 00000000ffffffff R11: 0000000000004db9 R12: 0000000000000020 [ 45.152251][ C1] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 45.162025][ C1] Kernel Offset: disabled [ 45.166363][ C1] Rebooting in 86400 seconds..