[info] Using makefile-style concurrent boot in runlevel 2.
[   41.476267][   T26] audit: type=1800 audit(1573980415.020:21): pid=7393 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[   41.526507][   T26] audit: type=1800 audit(1573980415.020:22): pid=7393 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0
[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] 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 '10.128.1.30' (ECDSA) to the list of known hosts.
2019/11/17 08:47:06 fuzzer started
2019/11/17 08:47:08 dialing manager at 10.128.0.105:33487
2019/11/17 08:47:08 syscalls: 2566
2019/11/17 08:47:08 code coverage: enabled
2019/11/17 08:47:08 comparison tracing: enabled
2019/11/17 08:47:08 extra coverage: extra coverage is not supported by the kernel
2019/11/17 08:47:08 setuid sandbox: enabled
2019/11/17 08:47:08 namespace sandbox: enabled
2019/11/17 08:47:08 Android sandbox: /sys/fs/selinux/policy does not exist
2019/11/17 08:47:08 fault injection: enabled
2019/11/17 08:47:08 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/11/17 08:47:08 net packet injection: enabled
2019/11/17 08:47:08 net device setup: enabled
2019/11/17 08:47:08 concurrency sanitizer: enabled
2019/11/17 08:47:08 devlink PCI setup: PCI device 0000:00:10.0 is not available
2019/11/17 08:47:09 adding functions to KCSAN blacklist: 'ext4_free_inode' 'run_timer_softirq' 'tcp_add_backlog' '__ext4_new_inode' 'rcu_gp_fqs_check_wake' '__hrtimer_run_queues' 'ep_poll' 'tomoyo_supervisor' 
syzkaller login: [   56.644482][ T7558] ==================================================================
[   56.652602][ T7558] BUG: KCSAN: data-race in mod_timer / timer_clear_idle
[   56.659509][ T7558] 
[   56.661817][ T7558] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1:
[   56.669164][ T7558]  timer_clear_idle+0x42/0x50
[   56.673843][ T7558]  __tick_nohz_idle_restart_tick+0x36/0x1b0
[   56.679712][ T7558]  tick_nohz_idle_exit+0x1af/0x1e0
[   56.684811][ T7558]  do_idle+0xb1/0x280
[   56.688773][ T7558]  cpu_startup_entry+0x1b/0x20
[   56.693519][ T7558]  start_secondary+0x168/0x1b0
[   56.698261][ T7558]  secondary_startup_64+0xa4/0xb0
[   56.703253][ T7558] 
[   56.705573][ T7558] read to 0xffff88812bf1b6e4 of 1 bytes by task 7558 on cpu 0:
[   56.713786][ T7558]  mod_timer+0x50d/0x7a0
[   56.718011][ T7558]  sk_reset_timer+0x2d/0x70
[   56.722493][ T7558]  tcp_rearm_rto+0x1e7/0x2a0
[   56.727064][ T7558]  tcp_event_new_data_sent+0x218/0x220
[   56.732499][ T7558]  tcp_write_xmit+0xa77/0x3120
[   56.737241][ T7558]  __tcp_push_pending_frames+0x7b/0x1d0
[   56.742765][ T7558]  tcp_push+0x1e9/0x3d0
[   56.746899][ T7558]  tcp_sendmsg_locked+0x1d2b/0x1fb0
[   56.752073][ T7558]  tcp_sendmsg+0x39/0x60
[   56.756296][ T7558]  inet_sendmsg+0x6d/0x90
[   56.762599][ T7558]  sock_sendmsg+0x9f/0xc0
[   56.766907][ T7558]  sock_write_iter+0x16b/0x210
[   56.771647][ T7558]  new_sync_write+0x388/0x4a0
[   56.776310][ T7558]  __vfs_write+0xb1/0xc0
[   56.780537][ T7558]  vfs_write+0x18a/0x390
[   56.784761][ T7558]  ksys_write+0xd5/0x1b0
[   56.788988][ T7558]  __x64_sys_write+0x4c/0x60
[   56.793555][ T7558]  do_syscall_64+0xcc/0x370
[   56.798038][ T7558]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   56.803897][ T7558] 
[   56.806200][ T7558] Reported by Kernel Concurrency Sanitizer on:
[   56.812329][ T7558] CPU: 0 PID: 7558 Comm: syz-fuzzer Not tainted 5.4.0-rc7+ #0
[   56.819757][ T7558] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   56.829791][ T7558] ==================================================================
[   56.837835][ T7558] Kernel panic - not syncing: panic_on_warn set ...
[   56.844397][ T7558] CPU: 0 PID: 7558 Comm: syz-fuzzer Not tainted 5.4.0-rc7+ #0
[   56.851834][ T7558] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   56.861867][ T7558] Call Trace:
[   56.865140][ T7558]  dump_stack+0x11d/0x181
[   56.869448][ T7558]  panic+0x210/0x640
[   56.873323][ T7558]  ? vprintk_func+0x8d/0x140
[   56.877896][ T7558]  kcsan_report.cold+0xc/0xd
[   56.882469][ T7558]  kcsan_setup_watchpoint+0x3fe/0x460
[   56.887821][ T7558]  __tsan_read1+0xc2/0x100
[   56.892230][ T7558]  mod_timer+0x50d/0x7a0
[   56.896463][ T7558]  ? tcp_update_skb_after_send+0x1a6/0x260
[   56.902251][ T7558]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   56.908478][ T7558]  sk_reset_timer+0x2d/0x70
[   56.912960][ T7558]  tcp_rearm_rto+0x1e7/0x2a0
[   56.917546][ T7558]  tcp_event_new_data_sent+0x218/0x220
[   56.922981][ T7558]  tcp_write_xmit+0xa77/0x3120
[   56.927741][ T7558]  ? kmem_cache_alloc_node_trace+0x273/0x670
[   56.933715][ T7558]  __tcp_push_pending_frames+0x7b/0x1d0
[   56.939251][ T7558]  tcp_push+0x1e9/0x3d0
[   56.943388][ T7558]  tcp_sendmsg_locked+0x1d2b/0x1fb0
[   56.948603][ T7558]  tcp_sendmsg+0x39/0x60
[   56.952828][ T7558]  inet_sendmsg+0x6d/0x90
[   56.957145][ T7558]  ? inet_send_prepare+0x200/0x200
[   56.962232][ T7558]  sock_sendmsg+0x9f/0xc0
[   56.966537][ T7558]  sock_write_iter+0x16b/0x210
[   56.971280][ T7558]  new_sync_write+0x388/0x4a0
[   56.975948][ T7558]  __vfs_write+0xb1/0xc0
[   56.980169][ T7558]  vfs_write+0x18a/0x390
[   56.984393][ T7558]  ksys_write+0xd5/0x1b0
[   56.988621][ T7558]  __x64_sys_write+0x4c/0x60
[   56.993207][ T7558]  do_syscall_64+0xcc/0x370
[   56.997694][ T7558]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   57.003560][ T7558] RIP: 0033:0x47c530
[   57.007451][ T7558] 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
[   57.027030][ T7558] RSP: 002b:000000c42027d4f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000001
[   57.035416][ T7558] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530
[   57.043361][ T7558] RDX: 0000000000000007 RSI: 000000c420180020 RDI: 0000000000000003
[   57.051307][ T7558] RBP: 000000c42027d550 R08: 0000000000000000 R09: 0000000000000000
[   57.059264][ T7558] R10: 0000000000000000 R11: 0000000000000216 R12: 000000c4200c5b00
[   57.067212][ T7558] R13: 000000000000000f R14: 0000000000c1ec00 R15: 0000000000000e21
[   58.211010][ T7558] Shutting down cpus with NMI
[   58.216894][ T7558] Kernel Offset: disabled
[   58.221218][ T7558] Rebooting in 86400 seconds..