[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.005368][ T25] audit: type=1800 audit(1570620041.714:25): pid=7060 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.032656][ T25] audit: type=1800 audit(1570620041.714:26): pid=7060 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.069138][ T25] audit: type=1800 audit(1570620041.714:27): pid=7060 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 '10.128.0.4' (ECDSA) to the list of known hosts. 2019/10/09 11:20:48 fuzzer started 2019/10/09 11:20:50 dialing manager at 10.128.0.105:43333 2019/10/09 11:20:50 syscalls: 2523 2019/10/09 11:20:50 code coverage: enabled 2019/10/09 11:20:50 comparison tracing: enabled 2019/10/09 11:20:50 extra coverage: extra coverage is not supported by the kernel 2019/10/09 11:20:50 setuid sandbox: enabled 2019/10/09 11:20:50 namespace sandbox: enabled 2019/10/09 11:20:50 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/09 11:20:50 fault injection: enabled 2019/10/09 11:20:50 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/09 11:20:50 net packet injection: enabled 2019/10/09 11:20:50 net device setup: enabled 2019/10/09 11:20:50 concurrency sanitizer: enabled syzkaller login: [ 45.715268][ T7208] ================================================================== [ 45.723398][ T7208] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 45.730315][ T7208] [ 45.732637][ T7208] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 45.739993][ T7208] timer_clear_idle+0x42/0x50 [ 45.744665][ T7208] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 45.750552][ T7208] tick_nohz_idle_exit+0x1af/0x1e0 [ 45.755649][ T7208] do_idle+0xb0/0x2c0 [ 45.759620][ T7208] cpu_startup_entry+0x1b/0x20 [ 45.764372][ T7208] start_secondary+0x207/0x260 [ 45.769118][ T7208] secondary_startup_64+0xa4/0xb0 [ 45.774117][ T7208] [ 45.776436][ T7208] read to 0xffff88812bf1b6e4 of 1 bytes by task 7208 on cpu 0: [ 45.783959][ T7208] mod_timer+0x50d/0x7a0 [ 45.788187][ T7208] sk_reset_timer+0x2d/0x70 [ 45.792674][ T7208] tcp_rearm_rto.part.0+0x190/0x240 [ 45.797854][ T7208] tcp_rearm_rto+0x4f/0x60 [ 45.802254][ T7208] tcp_event_new_data_sent+0x1bb/0x1c0 [ 45.807709][ T7208] tcp_write_xmit+0xa16/0x3080 [ 45.812631][ T7208] __tcp_push_pending_frames+0x7b/0x1d0 [ 45.818157][ T7208] tcp_push+0x1e9/0x3d0 [ 45.822296][ T7208] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 45.827473][ T7208] tcp_sendmsg+0x39/0x60 [ 45.831709][ T7208] inet_sendmsg+0x6d/0x90 [ 45.836043][ T7208] sock_sendmsg+0x9f/0xc0 [ 45.840353][ T7208] sock_write_iter+0x16b/0x210 [ 45.845095][ T7208] [ 45.847403][ T7208] Reported by Kernel Concurrency Sanitizer on: [ 45.853538][ T7208] CPU: 0 PID: 7208 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.860624][ T7208] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.870669][ T7208] ================================================================== [ 45.878721][ T7208] Kernel panic - not syncing: panic_on_warn set ... [ 45.885290][ T7208] CPU: 0 PID: 7208 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.892373][ T7208] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.902406][ T7208] Call Trace: [ 45.905694][ T7208] dump_stack+0xf5/0x159 [ 45.909929][ T7208] panic+0x209/0x639 [ 45.913809][ T7208] ? tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 45.919268][ T7208] ? vprintk_func+0x8d/0x140 [ 45.923848][ T7208] kcsan_report.cold+0xc/0x1b [ 45.928512][ T7208] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.934046][ T7208] __tsan_read1+0x2c/0x30 [ 45.938366][ T7208] mod_timer+0x50d/0x7a0 [ 45.942593][ T7208] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.948210][ T7208] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.953833][ T7208] sk_reset_timer+0x2d/0x70 [ 45.958327][ T7208] tcp_rearm_rto.part.0+0x190/0x240 [ 45.963513][ T7208] tcp_rearm_rto+0x4f/0x60 [ 45.967914][ T7208] tcp_event_new_data_sent+0x1bb/0x1c0 [ 45.973358][ T7208] tcp_write_xmit+0xa16/0x3080 [ 45.978113][ T7208] ? kmem_cache_alloc_node_trace+0x273/0x670 [ 45.984089][ T7208] __tcp_push_pending_frames+0x7b/0x1d0 [ 45.989617][ T7208] tcp_push+0x1e9/0x3d0 [ 45.993761][ T7208] tcp_sendmsg_locked+0x1d1b/0x1ef0 [ 45.998959][ T7208] tcp_sendmsg+0x39/0x60 [ 46.003187][ T7208] inet_sendmsg+0x6d/0x90 [ 46.007505][ T7208] ? inet_send_prepare+0x200/0x200 [ 46.012603][ T7208] sock_sendmsg+0x9f/0xc0 [ 46.016925][ T7208] sock_write_iter+0x16b/0x210 [ 46.021701][ T7208] new_sync_write+0x388/0x4a0 [ 46.026370][ T7208] __vfs_write+0xb1/0xc0 [ 46.030598][ T7208] vfs_write+0x18a/0x390 [ 46.034830][ T7208] ksys_write+0xd5/0x1b0 [ 46.039062][ T7208] __x64_sys_write+0x4c/0x60 [ 46.043641][ T7208] do_syscall_64+0xcf/0x2f0 [ 46.048146][ T7208] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.054019][ T7208] RIP: 0033:0x47c530 [ 46.057904][ T7208] 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 [ 46.077491][ T7208] RSP: 002b:000000c4204af4f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000001 [ 46.085884][ T7208] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 46.093838][ T7208] RDX: 0000000000000008 RSI: 000000c4201605c0 RDI: 0000000000000003 [ 46.101791][ T7208] RBP: 000000c4204af550 R08: 0000000000000000 R09: 0000000000000000 [ 46.109745][ T7208] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c4200c3b00 [ 46.117704][ T7208] R13: 0000000000000007 R14: 0000000000c11600 R15: 0000000000001d3f [ 47.257598][ T7208] Shutting down cpus with NMI [ 47.263462][ T7208] Kernel Offset: disabled [ 47.267802][ T7208] Rebooting in 86400 seconds..