[ 43.219027][ T25] audit: type=1800 audit(1571797864.505:22): pid=7052 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 43.246109][ T25] audit: type=1800 audit(1571797864.505:23): pid=7052 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 44.416519][ T7118] sshd (7118) used greatest stack depth: 10136 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. 2019/10/23 02:31:15 fuzzer started 2019/10/23 02:31:17 dialing manager at 10.128.0.105:42531 2019/10/23 02:31:18 syscalls: 2524 2019/10/23 02:31:18 code coverage: enabled 2019/10/23 02:31:18 comparison tracing: enabled 2019/10/23 02:31:18 extra coverage: extra coverage is not supported by the kernel 2019/10/23 02:31:18 setuid sandbox: enabled 2019/10/23 02:31:18 namespace sandbox: enabled 2019/10/23 02:31:18 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/23 02:31:18 fault injection: enabled 2019/10/23 02:31:18 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/23 02:31:18 net packet injection: enabled 2019/10/23 02:31:18 net device setup: enabled 2019/10/23 02:31:18 concurrency sanitizer: enabled syzkaller login: [ 62.066063][ T7219] KCSAN: could not find function: 'poll_schedule_timeout' 2019/10/23 02:31:26 adding functions to KCSAN blacklist: 'mod_timer' 'padata_find_next' 'run_timer_softirq' '__hrtimer_run_queues' 'find_next_bit' 'ext4_has_free_clusters' 'pipe_poll' 'ktime_get_real_seconds' 'tick_sched_do_timer' 'generic_write_end' 'find_get_pages_range_tag' 'update_defense_level' 'wbt_issue' 'generic_permission' 'blk_mq_get_request' 'tick_do_update_jiffies64' 'xas_clear_mark' '__splice_from_pipe' 'blk_mq_run_hw_queue' 'ext4_free_inode' '__nf_conntrack_find_get' 'tomoyo_supervisor' 'kvm_arch_vcpu_load' 'xas_find_marked' 'poll_schedule_timeout' 'ep_poll' 'rcu_gp_fqs_check_wake' 'dd_has_work' 'tcp_add_backlog' 'fasync_remove_entry' '__nf_ct_refresh_acct' 'bio_endio' '__tcp_select_window' 'tcp_poll' [ 73.418437][ T7209] ================================================================== [ 73.426571][ T7209] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 73.434447][ T7209] [ 73.436779][ T7209] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 0: [ 73.444579][ T7209] timekeeping_advance+0x893/0xd80 [ 73.449689][ T7209] update_wall_time+0x19/0x20 [ 73.454426][ T7209] tick_do_update_jiffies64+0x1ae/0x260 [ 73.459967][ T7209] tick_sched_do_timer+0xd4/0xe0 [ 73.464901][ T7209] tick_sched_timer+0x43/0xe0 [ 73.469570][ T7209] __hrtimer_run_queues+0x288/0x600 [ 73.474763][ T7209] hrtimer_interrupt+0x22a/0x480 [ 73.479693][ T7209] smp_apic_timer_interrupt+0xdc/0x280 [ 73.485147][ T7209] apic_timer_interrupt+0xf/0x20 [ 73.490081][ T7209] __kcsan_setup_watchpoint+0x5d/0x4a0 [ 73.495533][ T7209] __tsan_read8+0x2c/0x30 [ 73.499884][ T7209] should_fail+0x63/0x45d [ 73.504207][ T7209] __should_failslab+0xee/0x130 [ 73.509052][ T7209] should_failslab+0x9/0x14 [ 73.513538][ T7209] [ 73.515866][ T7209] read to 0xffffffff86040b80 of 8 bytes by task 7209 on cpu 1: [ 73.523405][ T7209] ktime_get_seconds+0x45/0x70 [ 73.528160][ T7209] tcp_rcv_established+0xeeb/0xf50 [ 73.533266][ T7209] tcp_v4_do_rcv+0x381/0x4e0 [ 73.537852][ T7209] __release_sock+0x135/0x1e0 [ 73.542521][ T7209] release_sock+0x61/0x160 [ 73.546938][ T7209] tcp_recvmsg+0x63b/0x1a30 [ 73.551436][ T7209] inet_recvmsg+0xbb/0x250 [ 73.555864][ T7209] sock_recvmsg+0x92/0xb0 [ 73.560199][ T7209] sock_read_iter+0x15f/0x1e0 [ 73.564870][ T7209] new_sync_read+0x389/0x4f0 [ 73.569459][ T7209] __vfs_read+0xb1/0xc0 [ 73.573739][ T7209] vfs_read+0x143/0x2c0 [ 73.577875][ T7209] ksys_read+0xd5/0x1b0 [ 73.582002][ T7209] [ 73.584345][ T7209] Reported by Kernel Concurrency Sanitizer on: [ 73.590529][ T7209] CPU: 1 PID: 7209 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 73.598230][ T7209] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.608281][ T7209] ================================================================== [ 73.616325][ T7209] Kernel panic - not syncing: panic_on_warn set ... [ 73.622908][ T7209] CPU: 1 PID: 7209 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 73.632420][ T7209] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.642461][ T7209] Call Trace: [ 73.645745][ T7209] dump_stack+0xf5/0x159 [ 73.650408][ T7209] panic+0x210/0x640 [ 73.654287][ T7209] ? sock_read_iter+0x15f/0x1e0 [ 73.659125][ T7209] ? vprintk_func+0x8d/0x140 [ 73.663700][ T7209] kcsan_report.cold+0xc/0x10 [ 73.668378][ T7209] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 73.673911][ T7209] __tsan_read8+0x2c/0x30 [ 73.678231][ T7209] ktime_get_seconds+0x45/0x70 [ 73.682985][ T7209] tcp_rcv_established+0xeeb/0xf50 [ 73.688098][ T7209] ? ipv4_dst_check+0xc6/0xf0 [ 73.692783][ T7209] tcp_v4_do_rcv+0x381/0x4e0 [ 73.697365][ T7209] __release_sock+0x135/0x1e0 [ 73.702031][ T7209] release_sock+0x61/0x160 [ 73.706435][ T7209] tcp_recvmsg+0x63b/0x1a30 [ 73.710931][ T7209] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 73.716545][ T7209] inet_recvmsg+0xbb/0x250 [ 73.720940][ T7209] ? __tsan_read8+0x2c/0x30 [ 73.725422][ T7209] ? inet_sendpage+0x100/0x100 [ 73.730164][ T7209] sock_recvmsg+0x92/0xb0 [ 73.734474][ T7209] sock_read_iter+0x15f/0x1e0 [ 73.739137][ T7209] new_sync_read+0x389/0x4f0 [ 73.743716][ T7209] __vfs_read+0xb1/0xc0 [ 73.747848][ T7209] vfs_read+0x143/0x2c0 [ 73.751993][ T7209] ksys_read+0xd5/0x1b0 [ 73.756214][ T7209] __x64_sys_read+0x4c/0x60 [ 73.760708][ T7209] do_syscall_64+0xcc/0x370 [ 73.765203][ T7209] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 73.771072][ T7209] RIP: 0033:0x47c530 [ 73.775558][ T7209] 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 [ 73.795139][ T7209] RSP: 002b:000000c420200810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 73.803543][ T7209] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 73.811492][ T7209] RDX: 0000000000001000 RSI: 000000c420378000 RDI: 0000000000000003 [ 73.819449][ T7209] RBP: 000000c420200868 R08: 0000000000000000 R09: 0000000000000000 [ 73.827405][ T7209] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004 [ 73.835355][ T7209] R13: 000000c42125a680 R14: 0000000000000002 R15: ffffffffffffffff [ 73.844869][ T7209] Kernel Offset: disabled [ 73.849206][ T7209] Rebooting in 86400 seconds..