[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. 2020/06/15 23:22:04 fuzzer started 2020/06/15 23:22:04 dialing manager at 10.128.0.105:43759 2020/06/15 23:22:04 syscalls: 3085 2020/06/15 23:22:04 code coverage: enabled 2020/06/15 23:22:04 comparison tracing: enabled 2020/06/15 23:22:04 extra coverage: enabled 2020/06/15 23:22:04 setuid sandbox: enabled 2020/06/15 23:22:04 namespace sandbox: enabled 2020/06/15 23:22:04 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/15 23:22:04 fault injection: enabled 2020/06/15 23:22:04 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/15 23:22:04 net packet injection: enabled 2020/06/15 23:22:04 net device setup: enabled 2020/06/15 23:22:04 concurrency sanitizer: enabled 2020/06/15 23:22:04 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/15 23:22:04 USB emulation: enabled syzkaller login: [ 54.073785][ T8942] KCSAN: could not find function: 'poll_schedule_timeout' [ 55.851161][ T8942] KCSAN: could not find function: '_find_next_bit' 2020/06/15 23:22:09 suppressing KCSAN reports in functions: 'copy_process' 'ext4_mark_iloc_dirty' '__dev_queue_xmit' 'run_timer_softirq' '__send_signal' 'xas_clear_mark' 'futex_wait_queue_me' '__get_user_pages' 'iptunnel_xmit' 'ep_poll' 'tick_nohz_next_event' 'kauditd_thread' 'ext4_ext_try_to_merge_right' 'poll_schedule_timeout' '__bforget' 'blk_mq_sched_dispatch_requests' 'page_counter_charge' 'n_tty_receive_buf_common' 'ext4_free_inodes_count' 'af_alg_sendpage' 'do_syslog' '__ext4_new_inode' 'add_timer' 'generic_write_end' 'blk_mq_get_request' 'mod_timer' '_find_next_bit' 'tick_nohz_idle_stop_tick' 'generic_update_time' 'file_update_time' 'do_nanosleep' [ 220.630227][ C1] ================================================================== [ 220.638366][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 220.646513][ C1] [ 220.648846][ C1] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 220.656473][ C1] tick_sched_do_timer+0xb4/0xd0 [ 220.661407][ C1] tick_sched_timer+0x3f/0xd0 [ 220.666110][ C1] __hrtimer_run_queues+0x271/0x600 [ 220.671298][ C1] hrtimer_interrupt+0x226/0x490 [ 220.676316][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 220.681804][ C1] apic_timer_interrupt+0xf/0x20 [ 220.686736][ C1] __tsan_read8+0x8a/0x110 [ 220.691139][ C1] tcp_add_backlog+0x3a8/0xd40 [ 220.695934][ C1] tcp_v4_rcv+0x1cb0/0x1e10 [ 220.700475][ C1] ip_protocol_deliver_rcu+0x4b/0x410 [ 220.705852][ C1] ip_local_deliver_finish+0xf3/0x120 [ 220.711647][ C1] ip_local_deliver+0x135/0x220 [ 220.716484][ C1] ip_sublist_rcv_finish+0xf0/0x140 [ 220.721659][ C1] ip_sublist_rcv+0x3f8/0x530 [ 220.726415][ C1] ip_list_rcv+0x2f3/0x321 [ 220.730829][ C1] __netif_receive_skb_list_core+0x368/0x5c0 [ 220.736783][ C1] netif_receive_skb_list_internal+0x5c7/0x810 [ 220.742911][ C1] gro_normal_list.part.0+0x37/0xa0 [ 220.748088][ C1] gro_normal_one+0x14c/0x160 [ 220.752738][ C1] napi_gro_receive+0x27d/0x2f0 [ 220.757575][ C1] receive_buf+0x24c/0x3420 [ 220.762063][ C1] virtnet_poll+0x343/0x790 [ 220.766551][ C1] net_rx_action+0x3ad/0xac0 [ 220.771126][ C1] __do_softirq+0x118/0x34a [ 220.775617][ C1] run_ksoftirqd+0x41/0x60 [ 220.780005][ C1] smpboot_thread_fn+0x374/0x4a0 [ 220.785002][ C1] kthread+0x203/0x230 [ 220.789043][ C1] ret_from_fork+0x1f/0x30 [ 220.793436][ C1] [ 220.795741][ C1] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 220.803521][ C1] tick_sched_do_timer+0x2e/0xd0 [ 220.808434][ C1] tick_sched_timer+0x3f/0xd0 [ 220.813080][ C1] __hrtimer_run_queues+0x271/0x600 [ 220.818252][ C1] hrtimer_interrupt+0x226/0x490 [ 220.823166][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 220.828606][ C1] apic_timer_interrupt+0xf/0x20 [ 220.833516][ C1] _raw_spin_unlock_irqrestore+0x4d/0x80 [ 220.839120][ C1] __wake_up_common_lock+0x85/0xb0 [ 220.844202][ C1] sock_def_readable+0x9d/0x130 [ 220.849027][ C1] tcp_data_ready+0x76/0xc0 [ 220.853504][ C1] tcp_rcv_established+0xcb8/0xee0 [ 220.858600][ C1] tcp_v4_do_rcv+0x396/0x4f0 [ 220.863196][ C1] __release_sock+0x130/0x1e0 [ 220.867846][ C1] release_sock+0x5e/0x160 [ 220.872247][ C1] tcp_recvmsg+0x68e/0x1ba0 [ 220.876723][ C1] inet_recvmsg+0xc1/0x250 [ 220.881113][ C1] sock_recvmsg+0x8e/0xb0 [ 220.885415][ C1] sock_read_iter+0x185/0x230 [ 220.890066][ C1] new_sync_read+0x416/0x450 [ 220.894650][ C1] __vfs_read+0x9e/0xb0 [ 220.898794][ C1] vfs_read+0x13e/0x2b0 [ 220.903017][ C1] ksys_read+0x16a/0x1a0 [ 220.907232][ C1] __x64_sys_read+0x49/0x60 [ 220.911722][ C1] do_syscall_64+0xc7/0x3b0 [ 220.916209][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 220.922079][ C1] [ 220.924389][ C1] Reported by Kernel Concurrency Sanitizer on: [ 220.930519][ C1] CPU: 1 PID: 8932 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 220.938996][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 220.949029][ C1] ================================================================== [ 220.957063][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 220.963627][ C1] CPU: 1 PID: 8932 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 220.971829][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 220.981869][ C1] Call Trace: [ 220.985123][ C1] [ 220.987956][ C1] dump_stack+0x11d/0x187 [ 220.992272][ C1] panic+0x210/0x640 [ 220.996152][ C1] ? vprintk_func+0x89/0x13a [ 221.000722][ C1] kcsan_report.cold+0xc/0x1a [ 221.005375][ C1] kcsan_setup_watchpoint+0x3fb/0x440 [ 221.010737][ C1] tick_sched_do_timer+0x2e/0xd0 [ 221.015661][ C1] tick_sched_timer+0x3f/0xd0 [ 221.020963][ C1] __hrtimer_run_queues+0x271/0x600 [ 221.026157][ C1] ? tick_sched_do_timer+0xd0/0xd0 [ 221.031266][ C1] hrtimer_interrupt+0x226/0x490 [ 221.036183][ C1] ? kvm_clock_read+0x14/0x30 [ 221.040838][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 221.046273][ C1] apic_timer_interrupt+0xf/0x20 [ 221.051192][ C1] [ 221.054115][ C1] RIP: 0010:_raw_spin_unlock_irqrestore+0x4d/0x80 [ 221.060510][ C1] Code: 5b 01 00 74 46 48 89 df e8 70 03 6d fb 66 90 48 c7 c7 c0 c9 25 87 e8 92 d8 8a fb 48 83 3d 0a db 5b 01 00 74 28 48 89 ef 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 b4 7b 6a fb 65 8b 05 35 9d 37 7a [ 221.080088][ C1] RSP: 0018:ffffc90000db3910 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 221.088576][ C1] RAX: ffff8881269a5a18 RBX: ffff88812a3e1940 RCX: ffffffff88af0438 [ 221.096529][ C1] RDX: 000000000000002b RSI: 0000000000000282 RDI: 0000000000000282 [ 221.104497][ C1] RBP: 0000000000000282 R08: 0000000000000000 R09: 0000ffff8725c9c0 [ 221.112456][ C1] R10: 00008881269a5378 R11: 0000ffff8725c9c7 R12: 0000000000000001 [ 221.120839][ C1] R13: 00000000000000c3 R14: 0000000000000001 R15: 0000000000000001 [ 221.128802][ C1] __wake_up_common_lock+0x85/0xb0 [ 221.133891][ C1] sock_def_readable+0x9d/0x130 [ 221.138720][ C1] tcp_data_ready+0x76/0xc0 [ 221.143200][ C1] tcp_rcv_established+0xcb8/0xee0 [ 221.148286][ C1] tcp_v4_do_rcv+0x396/0x4f0 [ 221.152849][ C1] __release_sock+0x130/0x1e0 [ 221.157516][ C1] release_sock+0x5e/0x160 [ 221.161916][ C1] tcp_recvmsg+0x68e/0x1ba0 [ 221.166417][ C1] inet_recvmsg+0xc1/0x250 [ 221.170809][ C1] ? apparmor_socket_recvmsg+0x38/0x40 [ 221.177119][ C1] ? inet_sendpage+0xf0/0xf0 [ 221.181681][ C1] sock_recvmsg+0x8e/0xb0 [ 221.185986][ C1] sock_read_iter+0x185/0x230 [ 221.190643][ C1] new_sync_read+0x416/0x450 [ 221.195213][ C1] __vfs_read+0x9e/0xb0 [ 221.199865][ C1] vfs_read+0x13e/0x2b0 [ 221.204003][ C1] ksys_read+0x16a/0x1a0 [ 221.208410][ C1] __x64_sys_read+0x49/0x60 [ 221.212900][ C1] do_syscall_64+0xc7/0x3b0 [ 221.217392][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 221.223255][ C1] RIP: 0033:0x4b3cdb [ 221.227142][ C1] 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 [ 221.246730][ C1] RSP: 002b:000000c00019f8b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 221.255123][ C1] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 221.263067][ C1] RDX: 0000000000001000 RSI: 000000c00006e000 RDI: 0000000000000006 [ 221.271031][ C1] RBP: 000000c00019f908 R08: 00007ffe2aad0001 R09: 00000000000000dc [ 221.278976][ C1] R10: 0000000000000072 R11: 0000000000000212 R12: 0000000000000003 [ 221.286932][ C1] R13: 000000c000001500 R14: 0000000000000002 R15: 0000000000000002 [ 221.296255][ C1] Kernel Offset: disabled [ 221.300572][ C1] Rebooting in 86400 seconds..