[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.0' (ECDSA) to the list of known hosts. 2020/06/13 07:15:47 fuzzer started 2020/06/13 07:15:47 dialing manager at 10.128.0.105:39701 2020/06/13 07:15:47 syscalls: 3085 2020/06/13 07:15:47 code coverage: enabled 2020/06/13 07:15:47 comparison tracing: enabled 2020/06/13 07:15:47 extra coverage: enabled 2020/06/13 07:15:47 setuid sandbox: enabled 2020/06/13 07:15:47 namespace sandbox: enabled 2020/06/13 07:15:47 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/13 07:15:47 fault injection: enabled 2020/06/13 07:15:47 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/13 07:15:47 net packet injection: enabled 2020/06/13 07:15:47 net device setup: enabled 2020/06/13 07:15:47 concurrency sanitizer: enabled 2020/06/13 07:15:47 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/13 07:15:47 USB emulation: enabled syzkaller login: [ 52.053129][ T8917] KCSAN: could not find function: '_find_next_bit' 2020/06/13 07:15:51 adding functions to KCSAN blacklist: 'file_update_time' 'ep_poll' 'add_timer' '_find_next_bit' 'xas_clear_mark' 'tick_nohz_idle_stop_tick' 'other_inode_match' 'do_signal_stop' 'alloc_pid' 'echo_char' 'tick_nohz_next_event' 'generic_write_end' 'ext4_free_inodes_count' 'blk_mq_dispatch_rq_list' '__ext4_new_inode' 'copy_process' 'page_counter_charge' 'pcpu_alloc' 'tick_sched_do_timer' 'iput' 'do_nanosleep' '__snd_rawmidi_transmit_ack' 'generic_fillattr' 'do_syslog' 'blk_mq_sched_dispatch_requests' 'blk_mq_get_request' 'find_get_pages_range_tag' '__send_signal' 'kauditd_thread' 'fasync_remove_entry' 'io_sq_thread' 'run_timer_softirq' 'futex_wait_queue_me' [ 282.850335][ T8906] ================================================================== [ 282.858472][ T8906] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 282.865379][ T8906] [ 282.867688][ T8906] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1: [ 282.875042][ T8906] timer_clear_idle+0x3d/0x50 [ 282.879702][ T8906] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 282.885576][ T8906] tick_nohz_idle_exit+0x19c/0x1d0 [ 282.890665][ T8906] do_idle+0xac/0x290 [ 282.894814][ T8906] cpu_startup_entry+0x14/0x20 [ 282.899555][ T8906] start_secondary+0x169/0x1b0 [ 282.904325][ T8906] secondary_startup_64+0xa4/0xb0 [ 282.909463][ T8906] [ 282.912156][ T8906] read to 0xffff88812c11dca4 of 1 bytes by task 8906 on cpu 0: [ 282.919684][ T8906] mod_timer+0x631/0x830 [ 282.924083][ T8906] sk_reset_timer+0x29/0xc0 [ 282.928646][ T8906] tcp_rearm_rto+0x1ce/0x280 [ 282.933235][ T8906] tcp_event_new_data_sent+0x23f/0x260 [ 282.938678][ T8906] tcp_write_xmit+0x5c6/0x31e0 [ 282.943447][ T8906] __tcp_push_pending_frames+0x72/0x1b0 [ 282.948970][ T8906] tcp_push+0x1ec/0x3e0 [ 282.953104][ T8906] tcp_sendmsg_locked+0x1de3/0x20f0 [ 282.958296][ T8906] tcp_sendmsg+0x35/0x50 [ 282.962567][ T8906] inet_sendmsg+0x69/0x90 [ 282.966876][ T8906] sock_sendmsg+0x98/0xc0 [ 282.971186][ T8906] sock_write_iter+0x186/0x240 [ 282.975943][ T8906] new_sync_write+0x303/0x400 [ 282.980596][ T8906] __vfs_write+0x9e/0xb0 [ 282.984812][ T8906] vfs_write+0x189/0x380 [ 282.989042][ T8906] ksys_write+0x16a/0x1a0 [ 282.993347][ T8906] __x64_sys_write+0x49/0x60 [ 282.997946][ T8906] do_syscall_64+0xc7/0x3b0 [ 283.002431][ T8906] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 283.008295][ T8906] [ 283.010601][ T8906] Reported by Kernel Concurrency Sanitizer on: [ 283.016734][ T8906] CPU: 0 PID: 8906 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 283.025078][ T8906] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 283.035376][ T8906] ================================================================== [ 283.043542][ T8906] Kernel panic - not syncing: panic_on_warn set ... [ 283.050117][ T8906] CPU: 0 PID: 8906 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 283.058326][ T8906] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 283.068360][ T8906] Call Trace: [ 283.071636][ T8906] dump_stack+0x11d/0x187 [ 283.075951][ T8906] panic+0x210/0x640 [ 283.079844][ T8906] ? vprintk_func+0x89/0x13a [ 283.084871][ T8906] kcsan_report.cold+0xc/0x1a [ 283.089531][ T8906] kcsan_setup_watchpoint+0x3fb/0x440 [ 283.095347][ T8906] mod_timer+0x631/0x830 [ 283.099587][ T8906] sk_reset_timer+0x29/0xc0 [ 283.104070][ T8906] tcp_rearm_rto+0x1ce/0x280 [ 283.108646][ T8906] tcp_event_new_data_sent+0x23f/0x260 [ 283.114093][ T8906] tcp_write_xmit+0x5c6/0x31e0 [ 283.118841][ T8906] ? iov_iter_advance+0x21c/0x900 [ 283.123861][ T8906] __tcp_push_pending_frames+0x72/0x1b0 [ 283.129404][ T8906] tcp_push+0x1ec/0x3e0 [ 283.133583][ T8906] tcp_sendmsg_locked+0x1de3/0x20f0 [ 283.138858][ T8906] ? aa_label_sk_perm.part.0+0x220/0x290 [ 283.144475][ T8906] tcp_sendmsg+0x35/0x50 [ 283.148722][ T8906] inet_sendmsg+0x69/0x90 [ 283.153033][ T8906] ? inet_send_prepare+0x1f0/0x1f0 [ 283.158125][ T8906] sock_sendmsg+0x98/0xc0 [ 283.162438][ T8906] sock_write_iter+0x186/0x240 [ 283.167183][ T8906] new_sync_write+0x303/0x400 [ 283.171868][ T8906] __vfs_write+0x9e/0xb0 [ 283.176122][ T8906] vfs_write+0x189/0x380 [ 283.180341][ T8906] ksys_write+0x16a/0x1a0 [ 283.184648][ T8906] __x64_sys_write+0x49/0x60 [ 283.189217][ T8906] do_syscall_64+0xc7/0x3b0 [ 283.193788][ T8906] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 283.199665][ T8906] RIP: 0033:0x4b3cdb [ 283.203549][ T8906] Code: ff e9 69 ff ff ff cc cc cc cc cc cc cc cc cc e8 bb a1 f8 ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 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 [ 283.223151][ T8906] RSP: 002b:000000c015017540 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 283.231638][ T8906] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 283.239701][ T8906] RDX: 0000000000000007 RSI: 000000c00000a200 RDI: 0000000000000006 [ 283.247800][ T8906] RBP: 000000c015017590 R08: 000000c00000a201 R09: 0000000000000007 [ 283.255814][ T8906] R10: 000000c000112000 R11: 0000000000000202 R12: 000000000000011e [ 283.263765][ T8906] R13: 000000c000322000 R14: 0000000000000007 R15: 0000000000005df4 [ 284.361155][ T8906] Shutting down cpus with NMI [ 284.367478][ T8906] Kernel Offset: disabled [ 284.371804][ T8906] Rebooting in 86400 seconds..