[ 59.317134][ T26] audit: type=1800 audit(1573339011.969:27): pid=7903 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 59.337648][ T26] audit: type=1800 audit(1573339011.979:28): pid=7903 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 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. [ 60.071173][ T26] audit: type=1800 audit(1573339012.789:29): pid=7903 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 [ 60.092188][ T26] audit: type=1800 audit(1573339012.799:30): pid=7903 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.64' (ECDSA) to the list of known hosts. 2019/11/09 22:37:02 fuzzer started 2019/11/09 22:37:04 dialing manager at 10.128.0.105:33901 2019/11/09 22:37:04 syscalls: 2553 2019/11/09 22:37:04 code coverage: enabled 2019/11/09 22:37:04 comparison tracing: enabled 2019/11/09 22:37:04 extra coverage: extra coverage is not supported by the kernel 2019/11/09 22:37:04 setuid sandbox: enabled 2019/11/09 22:37:04 namespace sandbox: enabled 2019/11/09 22:37:04 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/09 22:37:04 fault injection: enabled 2019/11/09 22:37:04 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/09 22:37:04 net packet injection: enabled 2019/11/09 22:37:04 net device setup: enabled 2019/11/09 22:37:04 concurrency sanitizer: enabled 2019/11/09 22:37:04 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/09 22:37:06 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'wbt_issue' 'xas_clear_mark' 'tcp_add_backlog' 'find_next_bit' 'tomoyo_supervisor' 'rcu_gp_fqs_check_wake' 'tick_do_update_jiffies64' 'run_timer_softirq' 'blk_mq_dispatch_rq_list' syzkaller login: [ 75.049945][ T8070] ================================================================== [ 75.058200][ T8070] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 75.065119][ T8070] [ 75.067453][ T8070] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 75.074818][ T8070] timer_clear_idle+0x42/0x50 [ 75.079589][ T8070] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 75.085487][ T8070] tick_nohz_idle_exit+0x1af/0x1e0 [ 75.090590][ T8070] do_idle+0xb1/0x280 [ 75.094567][ T8070] cpu_startup_entry+0x1b/0x20 [ 75.099848][ T8070] rest_init+0xec/0xf6 [ 75.103917][ T8070] arch_call_rest_init+0x17/0x37 [ 75.109037][ T8070] start_kernel+0x838/0x85e [ 75.113539][ T8070] x86_64_start_reservations+0x29/0x2b [ 75.118998][ T8070] x86_64_start_kernel+0x72/0x76 [ 75.123927][ T8070] secondary_startup_64+0xa4/0xb0 [ 75.128940][ T8070] [ 75.131267][ T8070] read to 0xffff88812be1b6e4 of 1 bytes by task 8070 on cpu 1: [ 75.138807][ T8070] mod_timer+0x50d/0x7a0 [ 75.143049][ T8070] sk_reset_timer+0x2d/0x70 [ 75.147575][ T8070] tcp_rearm_rto+0x1e7/0x2a0 [ 75.152168][ T8070] tcp_event_new_data_sent+0x218/0x220 [ 75.157634][ T8070] tcp_write_xmit+0xa77/0x3120 [ 75.162413][ T8070] __tcp_push_pending_frames+0x7b/0x1d0 [ 75.167957][ T8070] tcp_push+0x1e9/0x3d0 [ 75.172112][ T8070] tcp_sendmsg_locked+0x1d2b/0x1fb0 [ 75.177304][ T8070] tcp_sendmsg+0x39/0x60 [ 75.181548][ T8070] inet_sendmsg+0x6d/0x90 [ 75.185895][ T8070] sock_sendmsg+0x9f/0xc0 [ 75.190248][ T8070] sock_write_iter+0x16b/0x210 [ 75.195006][ T8070] new_sync_write+0x388/0x4a0 [ 75.200196][ T8070] __vfs_write+0xb1/0xc0 [ 75.204428][ T8070] vfs_write+0x18a/0x390 [ 75.208665][ T8070] ksys_write+0xd5/0x1b0 [ 75.212903][ T8070] __x64_sys_write+0x4c/0x60 [ 75.217501][ T8070] do_syscall_64+0xcc/0x370 [ 75.222000][ T8070] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 75.227871][ T8070] [ 75.230182][ T8070] Reported by Kernel Concurrency Sanitizer on: [ 75.236344][ T8070] CPU: 1 PID: 8070 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 75.243805][ T8070] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.253859][ T8070] ================================================================== [ 75.262059][ T8070] Kernel panic - not syncing: panic_on_warn set ... [ 75.268910][ T8070] CPU: 1 PID: 8070 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 75.276359][ T8070] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.286403][ T8070] Call Trace: [ 75.289710][ T8070] dump_stack+0xf5/0x159 [ 75.293950][ T8070] panic+0x210/0x640 [ 75.297859][ T8070] ? vprintk_func+0x8d/0x140 [ 75.302452][ T8070] kcsan_report.cold+0xc/0xe [ 75.307043][ T8070] kcsan_setup_watchpoint+0x3fe/0x410 [ 75.313301][ T8070] __tsan_read1+0x13f/0x1e0 [ 75.317826][ T8070] mod_timer+0x50d/0x7a0 [ 75.322087][ T8070] ? tcp_update_skb_after_send+0x1a6/0x260 [ 75.327896][ T8070] sk_reset_timer+0x2d/0x70 [ 75.332406][ T8070] tcp_rearm_rto+0x1e7/0x2a0 [ 75.337107][ T8070] tcp_event_new_data_sent+0x218/0x220 [ 75.342569][ T8070] tcp_write_xmit+0xa77/0x3120 [ 75.347346][ T8070] ? kmem_cache_alloc_node_trace+0x273/0x670 [ 75.353348][ T8070] __tcp_push_pending_frames+0x7b/0x1d0 [ 75.358900][ T8070] tcp_push+0x1e9/0x3d0 [ 75.363064][ T8070] tcp_sendmsg_locked+0x1d2b/0x1fb0 [ 75.368278][ T8070] tcp_sendmsg+0x39/0x60 [ 75.372519][ T8070] inet_sendmsg+0x6d/0x90 [ 75.376845][ T8070] ? inet_send_prepare+0x200/0x200 [ 75.381981][ T8070] sock_sendmsg+0x9f/0xc0 [ 75.386331][ T8070] sock_write_iter+0x16b/0x210 [ 75.391209][ T8070] new_sync_write+0x388/0x4a0 [ 75.395901][ T8070] __vfs_write+0xb1/0xc0 [ 75.400148][ T8070] vfs_write+0x18a/0x390 [ 75.404390][ T8070] ksys_write+0xd5/0x1b0 [ 75.408640][ T8070] __x64_sys_write+0x4c/0x60 [ 75.413236][ T8070] do_syscall_64+0xcc/0x370 [ 75.417839][ T8070] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 75.423720][ T8070] RIP: 0033:0x47c530 [ 75.427705][ T8070] 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 [ 75.447320][ T8070] RSP: 002b:000000c4201474f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 75.455730][ T8070] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 75.463877][ T8070] RDX: 0000000000000007 RSI: 000000c420056020 RDI: 0000000000000003 [ 75.471841][ T8070] RBP: 000000c420147550 R08: 0000000000000000 R09: 0000000000000000 [ 75.479802][ T8070] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c4200c3b00 [ 75.487853][ T8070] R13: 000000000000000f R14: 0000000000c1dc00 R15: 0000000000000681 [ 76.640165][ T8070] Shutting down cpus with NMI [ 76.646329][ T8070] Kernel Offset: disabled [ 76.650776][ T8070] Rebooting in 86400 seconds..