[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.913189][ T25] audit: type=1800 audit(1570879065.581:25): pid=7095 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.933003][ T25] audit: type=1800 audit(1570879065.581:26): pid=7095 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.954743][ T25] audit: type=1800 audit(1570879065.581:27): pid=7095 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. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. 2019/10/12 11:17:56 fuzzer started 2019/10/12 11:17:58 dialing manager at 10.128.0.105:43913 2019/10/12 11:17:58 syscalls: 2523 2019/10/12 11:17:58 code coverage: enabled 2019/10/12 11:17:58 comparison tracing: enabled 2019/10/12 11:17:58 extra coverage: extra coverage is not supported by the kernel 2019/10/12 11:17:58 setuid sandbox: enabled 2019/10/12 11:17:58 namespace sandbox: enabled 2019/10/12 11:17:58 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 11:17:58 fault injection: enabled 2019/10/12 11:17:58 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 11:17:58 net packet injection: enabled 2019/10/12 11:17:58 net device setup: enabled 2019/10/12 11:17:58 concurrency sanitizer: enabled syzkaller login: [ 48.600242][ C1] ================================================================== [ 48.608382][ C1] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 48.617307][ C1] [ 48.619631][ C1] write to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 0: [ 48.627261][ C1] tick_do_update_jiffies64+0x105/0x260 [ 48.632831][ C1] tick_sched_do_timer+0xd4/0xe0 [ 48.637913][ C1] tick_sched_timer+0x43/0xe0 [ 48.642574][ C1] __hrtimer_run_queues+0x288/0x600 [ 48.647788][ C1] hrtimer_interrupt+0x22a/0x480 [ 48.652706][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 48.658141][ C1] apic_timer_interrupt+0xf/0x20 [ 48.663059][ C1] __kcsan_check_watchpoint+0x95/0x180 [ 48.668575][ C1] __tsan_read1+0x15/0x30 [ 48.672902][ C1] tcp_v4_rcv+0x1778/0x1bf0 [ 48.677420][ C1] ip_protocol_deliver_rcu+0x51/0x470 [ 48.682771][ C1] ip_local_deliver_finish+0x110/0x140 [ 48.688251][ C1] ip_local_deliver+0x133/0x210 [ 48.693076][ C1] ip_rcv_finish+0x121/0x160 [ 48.697630][ C1] [ 48.699935][ C1] read to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 48.707452][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 48.712928][ C1] tick_sched_do_timer+0xd4/0xe0 [ 48.717915][ C1] tick_sched_timer+0x43/0xe0 [ 48.722572][ C1] __hrtimer_run_queues+0x288/0x600 [ 48.727757][ C1] hrtimer_interrupt+0x22a/0x480 [ 48.732672][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 48.738106][ C1] apic_timer_interrupt+0xf/0x20 [ 48.743031][ C1] __kcsan_check_watchpoint+0xbb/0x180 [ 48.748473][ C1] __tsan_read4+0x15/0x30 [ 48.752788][ C1] validate_xmit_skb+0x38c/0x870 [ 48.757756][ C1] validate_xmit_skb_list+0xa5/0xe0 [ 48.762932][ C1] sch_direct_xmit+0x1b7/0x870 [ 48.767670][ C1] __dev_queue_xmit+0x172e/0x1b90 [ 48.772661][ C1] [ 48.774961][ C1] Reported by Kernel Concurrency Sanitizer on: [ 48.781090][ C1] CPU: 1 PID: 7247 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.788168][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.798217][ C1] ================================================================== [ 48.806353][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 48.812930][ C1] CPU: 1 PID: 7247 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.820013][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.830091][ C1] Call Trace: [ 48.833392][ C1] [ 48.836227][ C1] dump_stack+0xf5/0x159 [ 48.840452][ C1] panic+0x209/0x639 [ 48.844367][ C1] ? __tsan_read4+0x15/0x30 [ 48.848846][ C1] ? vprintk_func+0x8d/0x140 [ 48.853425][ C1] kcsan_report.cold+0xc/0x1b [ 48.858080][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 48.863601][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 48.869256][ C1] __tsan_read8+0x2c/0x30 [ 48.873563][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 48.878997][ C1] tick_sched_do_timer+0xd4/0xe0 [ 48.883913][ C1] tick_sched_timer+0x43/0xe0 [ 48.888572][ C1] __hrtimer_run_queues+0x288/0x600 [ 48.893748][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 48.898838][ C1] hrtimer_interrupt+0x22a/0x480 [ 48.903760][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 48.909195][ C1] ? smp_reschedule_interrupt+0x71/0x1d0 [ 48.914827][ C1] apic_timer_interrupt+0xf/0x20 [ 48.919735][ C1] [ 48.922652][ C1] RIP: 0010:__kcsan_check_watchpoint+0xbb/0x180 [ 48.928888][ C1] Code: 8d 44 1e ff 41 89 c3 41 c1 fb 1f 41 c1 eb 1a 44 01 d8 83 e0 3f 44 29 d8 48 98 4c 8d 1c c5 20 2c 04 86 48 8b 04 c5 20 2c 04 86 <48> 83 f8 01 76 2c 48 89 c3 49 89 c7 48 c1 eb 31 49 21 cf 81 e3 ff [ 48.948483][ C1] RSP: 0018:ffffc9000176b480 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 48.956868][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000ffffffffffff [ 48.964831][ C1] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 00008881251015bc [ 48.972783][ C1] RBP: ffffc9000176b4a8 R08: 0000000000000000 R09: 00008881251015bf [ 48.980734][ C1] R10: 00000000aaaaaaab R11: ffffffff86042c20 R12: 0000000000000000 [ 48.988687][ C1] R13: ffff8881251015bc R14: 0000000000000004 R15: ffff8881251015c0 [ 48.996672][ C1] __tsan_read4+0x15/0x30 [ 49.001013][ C1] validate_xmit_skb+0x38c/0x870 [ 49.005954][ C1] validate_xmit_skb_list+0xa5/0xe0 [ 49.011152][ C1] sch_direct_xmit+0x1b7/0x870 [ 49.015896][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 49.021522][ C1] __dev_queue_xmit+0x172e/0x1b90 [ 49.026531][ C1] ? ipt_do_table+0x8e6/0xe40 [ 49.031189][ C1] ? __tsan_read1+0x2c/0x30 [ 49.035677][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 49.041290][ C1] ? __tsan_write4+0x32/0x40 [ 49.045864][ C1] dev_queue_xmit+0x21/0x30 [ 49.050351][ C1] ip_finish_output2+0x834/0xe40 [ 49.055293][ C1] __ip_finish_output+0x23a/0x490 [ 49.060320][ C1] ip_finish_output+0x41/0x160 [ 49.065089][ C1] ip_output+0xdf/0x210 [ 49.069366][ C1] ? __ip_finish_output+0x490/0x490 [ 49.074560][ C1] ip_local_out+0x74/0x90 [ 49.078878][ C1] __ip_queue_xmit+0x3a8/0xa40 [ 49.083656][ C1] ip_queue_xmit+0x45/0x60 [ 49.088091][ C1] __tcp_transmit_skb+0xdeb/0x1cd0 [ 49.093202][ C1] __tcp_send_ack+0x246/0x300 [ 49.097867][ C1] tcp_send_ack+0x34/0x40 [ 49.102181][ C1] tcp_cleanup_rbuf+0x130/0x360 [ 49.107015][ C1] tcp_recvmsg+0x633/0x1a30 [ 49.111517][ C1] inet_recvmsg+0xbb/0x250 [ 49.115914][ C1] ? __tsan_read8+0x2c/0x30 [ 49.120402][ C1] ? inet_sendpage+0x100/0x100 [ 49.125148][ C1] sock_recvmsg+0x92/0xb0 [ 49.129486][ C1] sock_read_iter+0x15f/0x1e0 [ 49.134153][ C1] new_sync_read+0x389/0x4f0 [ 49.138729][ C1] __vfs_read+0xb1/0xc0 [ 49.142879][ C1] vfs_read+0x143/0x2c0 [ 49.147020][ C1] ksys_read+0xd5/0x1b0 [ 49.151186][ C1] __x64_sys_read+0x4c/0x60 [ 49.155677][ C1] do_syscall_64+0xcf/0x2f0 [ 49.160234][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.166108][ C1] RIP: 0033:0x47c530 [ 49.169989][ C1] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 49.189682][ C1] RSP: 002b:000000c4201837d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 49.198259][ C1] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 49.206407][ C1] RDX: 0000000000001000 RSI: 000000c4203b6000 RDI: 0000000000000003 [ 49.214364][ C1] RBP: 000000c420183830 R08: 0000000000000000 R09: 0000000000000000 [ 49.222319][ C1] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000040 [ 49.230567][ C1] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 49.240246][ C1] Kernel Offset: disabled [ 49.244701][ C1] Rebooting in 86400 seconds..