[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.076672][ T25] audit: type=1800 audit(1570560282.554:25): pid=7037 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.104059][ T25] audit: type=1800 audit(1570560282.554:26): pid=7037 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.138392][ T25] audit: type=1800 audit(1570560282.554:27): pid=7037 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 '10.128.0.79' (ECDSA) to the list of known hosts. 2019/10/08 18:44:50 fuzzer started 2019/10/08 18:44:51 dialing manager at 10.128.0.105:35069 2019/10/08 18:44:51 syscalls: 2523 2019/10/08 18:44:51 code coverage: enabled 2019/10/08 18:44:51 comparison tracing: enabled 2019/10/08 18:44:51 extra coverage: extra coverage is not supported by the kernel 2019/10/08 18:44:51 setuid sandbox: enabled 2019/10/08 18:44:51 namespace sandbox: enabled 2019/10/08 18:44:51 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/08 18:44:51 fault injection: enabled 2019/10/08 18:44:51 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/08 18:44:51 net packet injection: enabled 2019/10/08 18:44:51 net device setup: enabled 2019/10/08 18:44:51 concurrency sanitizer: enabled syzkaller login: [ 44.880319][ T7190] ================================================================== [ 44.888455][ T7190] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 44.895366][ T7190] [ 44.897686][ T7190] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 44.905044][ T7190] timer_clear_idle+0x42/0x50 [ 44.909720][ T7190] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 44.915606][ T7190] tick_nohz_idle_exit+0x1af/0x1e0 [ 44.920701][ T7190] do_idle+0xb0/0x2c0 [ 44.924664][ T7190] cpu_startup_entry+0x1b/0x20 [ 44.929416][ T7190] start_secondary+0x207/0x260 [ 44.934165][ T7190] secondary_startup_64+0xa4/0xb0 [ 44.939510][ T7190] [ 44.941846][ T7190] read to 0xffff88812bf1b6e4 of 1 bytes by task 7190 on cpu 0: [ 44.949399][ T7190] mod_timer+0x50d/0x7a0 [ 44.953628][ T7190] sk_reset_timer+0x2d/0x70 [ 44.958116][ T7190] tcp_rearm_rto.part.0+0x190/0x240 [ 44.963295][ T7190] tcp_rearm_rto+0x4f/0x60 [ 44.967695][ T7190] tcp_event_new_data_sent+0x1bb/0x1c0 [ 44.973149][ T7190] tcp_write_xmit+0xa16/0x3080 [ 44.977900][ T7190] __tcp_push_pending_frames+0x7b/0x1d0 [ 44.983427][ T7190] tcp_push+0x1e9/0x3d0 [ 44.987574][ T7190] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 44.992754][ T7190] tcp_sendmsg+0x39/0x60 [ 44.996982][ T7190] inet_sendmsg+0x6d/0x90 [ 45.001295][ T7190] sock_sendmsg+0x9f/0xc0 [ 45.005605][ T7190] sock_write_iter+0x16b/0x210 [ 45.010352][ T7190] [ 45.012764][ T7190] Reported by Kernel Concurrency Sanitizer on: [ 45.018917][ T7190] CPU: 0 PID: 7190 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.026003][ T7190] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.036041][ T7190] ================================================================== [ 45.044091][ T7190] Kernel panic - not syncing: panic_on_warn set ... [ 45.050661][ T7190] CPU: 0 PID: 7190 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.057746][ T7190] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.067781][ T7190] Call Trace: [ 45.071062][ T7190] dump_stack+0xf5/0x159 [ 45.075294][ T7190] panic+0x209/0x639 [ 45.079178][ T7190] ? tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 45.084539][ T7190] ? vprintk_func+0x8d/0x140 [ 45.089121][ T7190] kcsan_report.cold+0xc/0x1b [ 45.093787][ T7190] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.099318][ T7190] __tsan_read1+0x2c/0x30 [ 45.103637][ T7190] mod_timer+0x50d/0x7a0 [ 45.107879][ T7190] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.113499][ T7190] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.119123][ T7190] sk_reset_timer+0x2d/0x70 [ 45.123624][ T7190] tcp_rearm_rto.part.0+0x190/0x240 [ 45.128810][ T7190] tcp_rearm_rto+0x4f/0x60 [ 45.133214][ T7190] tcp_event_new_data_sent+0x1bb/0x1c0 [ 45.138664][ T7190] tcp_write_xmit+0xa16/0x3080 [ 45.143420][ T7190] ? kmem_cache_alloc_node_trace+0x273/0x670 [ 45.149401][ T7190] __tcp_push_pending_frames+0x7b/0x1d0 [ 45.154933][ T7190] tcp_push+0x1e9/0x3d0 [ 45.159079][ T7190] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 45.164277][ T7190] tcp_sendmsg+0x39/0x60 [ 45.168505][ T7190] inet_sendmsg+0x6d/0x90 [ 45.172825][ T7190] ? inet_send_prepare+0x200/0x200 [ 45.177933][ T7190] sock_sendmsg+0x9f/0xc0 [ 45.182250][ T7190] sock_write_iter+0x16b/0x210 [ 45.187005][ T7190] new_sync_write+0x388/0x4a0 [ 45.191678][ T7190] __vfs_write+0xb1/0xc0 [ 45.195906][ T7190] vfs_write+0x18a/0x390 [ 45.200147][ T7190] ksys_write+0xd5/0x1b0 [ 45.204568][ T7190] __x64_sys_write+0x4c/0x60 [ 45.209147][ T7190] do_syscall_64+0xcf/0x2f0 [ 45.213641][ T7190] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.219520][ T7190] RIP: 0033:0x47c530 [ 45.223405][ T7190] 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 [ 45.242991][ T7190] RSP: 002b:000000c4207e54f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 45.251387][ T7190] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 45.259356][ T7190] RDX: 0000000000000007 RSI: 000000c42032c020 RDI: 0000000000000003 [ 45.267315][ T7190] RBP: 000000c4207e5550 R08: 0000000000000000 R09: 0000000000000000 [ 45.275270][ T7190] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c4200c5b00 [ 45.283245][ T7190] R13: 000000000000000f R14: 0000000000c11600 R15: 0000000000000381 [ 46.424067][ T7190] Shutting down cpus with NMI [ 46.430009][ T7190] Kernel Offset: disabled [ 46.434335][ T7190] Rebooting in 86400 seconds..