[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts. 2020/06/10 09:25:13 fuzzer started 2020/06/10 09:25:13 dialing manager at 10.128.0.105:35015 2020/06/10 09:25:13 syscalls: 3072 2020/06/10 09:25:13 code coverage: enabled 2020/06/10 09:25:13 comparison tracing: enabled 2020/06/10 09:25:13 extra coverage: enabled 2020/06/10 09:25:13 setuid sandbox: enabled 2020/06/10 09:25:13 namespace sandbox: enabled 2020/06/10 09:25:13 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/10 09:25:13 fault injection: enabled 2020/06/10 09:25:13 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/10 09:25:13 net packet injection: enabled 2020/06/10 09:25:13 net device setup: enabled 2020/06/10 09:25:13 concurrency sanitizer: enabled 2020/06/10 09:25:13 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/10 09:25:13 USB emulation: enabled syzkaller login: [ 54.126729][ T8918] KCSAN: could not find function: 'poll_schedule_timeout' [ 55.392434][ T8918] KCSAN: could not find function: '_find_next_bit' 2020/06/10 09:25:20 adding functions to KCSAN blacklist: 'copy_process' 'mod_timer' 'echo_char' 'ktime_get_real_seconds' '__ip4_datagram_connect' 'audit_log_start' 'ep_poll' 'tick_nohz_idle_stop_tick' '__mark_inode_dirty' 'ext4_free_inodes_count' 'find_get_pages_range_tag' 'tick_nohz_next_event' 'blk_mq_sched_dispatch_requests' 'wbt_done' 'blk_mq_request_bypass_insert' 'generic_fillattr' 'ext4_mark_iloc_dirty' 'iput' '__x64_sys_ptrace' 'poll_schedule_timeout' '__send_signal' 'pcpu_alloc' '__ext4_new_inode' 'blk_mq_get_request' 'complete_signal' 'ext4_writepages' 'add_timer' 'xas_find_marked' '_find_next_bit' 'run_timer_softirq' 'futex_wait_queue_me' 'generic_write_end' 'file_update_time' 'lookup_fast' '__snd_rawmidi_transmit_ack' 'atime_needs_update' 'kcm_rfree' 'do_nanosleep' 'xas_clear_mark' 'page_counter_charge' 'do_signal_stop' 'tick_sched_do_timer' '__synchronize_hardirq' 'blk_mq_dispatch_rq_list' 'n_tty_receive_buf_common' 'shmem_add_to_page_cache' 'kauditd_thread' [ 235.983020][ T8903] ================================================================== [ 235.991633][ T8903] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 235.999504][ T8903] [ 236.001835][ T8903] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 0: [ 236.009615][ T8903] timekeeping_advance+0x88e/0xd80 [ 236.014704][ T8903] update_wall_time+0x15/0x20 [ 236.019361][ T8903] tick_do_update_jiffies64+0x1e5/0x2a0 [ 236.024900][ T8903] tick_sched_do_timer+0xc7/0xd0 [ 236.029918][ T8903] tick_sched_timer+0x3f/0xd0 [ 236.034569][ T8903] __hrtimer_run_queues+0x271/0x600 [ 236.039762][ T8903] hrtimer_interrupt+0x226/0x490 [ 236.044699][ T8903] smp_apic_timer_interrupt+0xd8/0x270 [ 236.050141][ T8903] apic_timer_interrupt+0xf/0x20 [ 236.055059][ T8903] __sanitizer_cov_trace_pc+0x10/0x50 [ 236.060407][ T8903] packet_rcv+0x14c/0xa60 [ 236.064725][ T8903] __netif_receive_skb_core+0x108b/0x2120 [ 236.070419][ T8903] __netif_receive_skb_list_core+0x2b1/0x5c0 [ 236.076387][ T8903] netif_receive_skb_list_internal+0x5c7/0x810 [ 236.082526][ T8903] gro_normal_list.part.0+0x37/0xa0 [ 236.087881][ T8903] gro_normal_one+0x14c/0x160 [ 236.092546][ T8903] napi_gro_receive+0x27d/0x2f0 [ 236.097388][ T8903] receive_buf+0x24c/0x3420 [ 236.101867][ T8903] virtnet_poll+0x343/0x790 [ 236.106344][ T8903] net_rx_action+0x3ad/0xac0 [ 236.110908][ T8903] __do_softirq+0x118/0x34a [ 236.115385][ T8903] run_ksoftirqd+0x41/0x60 [ 236.119774][ T8903] smpboot_thread_fn+0x374/0x4a0 [ 236.124701][ T8903] kthread+0x203/0x230 [ 236.128744][ T8903] ret_from_fork+0x1f/0x30 [ 236.133128][ T8903] [ 236.135440][ T8903] read to 0xffffffff88ae9140 of 8 bytes by task 8903 on cpu 1: [ 236.142957][ T8903] ktime_get_seconds+0x42/0x60 [ 236.147699][ T8903] tcp_rcv_established+0xe79/0xee0 [ 236.152798][ T8903] tcp_v4_do_rcv+0x396/0x4f0 [ 236.157364][ T8903] __release_sock+0x130/0x1e0 [ 236.162060][ T8903] release_sock+0x5e/0x160 [ 236.166454][ T8903] tcp_recvmsg+0x68e/0x1ba0 [ 236.170944][ T8903] inet_recvmsg+0xc1/0x250 [ 236.175335][ T8903] sock_recvmsg+0x8e/0xb0 [ 236.179651][ T8903] sock_read_iter+0x185/0x230 [ 236.184302][ T8903] new_sync_read+0x416/0x450 [ 236.188878][ T8903] __vfs_read+0x9e/0xb0 [ 236.193019][ T8903] vfs_read+0x13e/0x2b0 [ 236.197163][ T8903] ksys_read+0x16a/0x1a0 [ 236.201376][ T8903] __x64_sys_read+0x49/0x60 [ 236.205867][ T8903] do_syscall_64+0xc7/0x3b0 [ 236.210357][ T8903] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 236.216230][ T8903] [ 236.218537][ T8903] Reported by Kernel Concurrency Sanitizer on: [ 236.224927][ T8903] CPU: 1 PID: 8903 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 236.233136][ T8903] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 236.243179][ T8903] ================================================================== [ 236.251215][ T8903] Kernel panic - not syncing: panic_on_warn set ... [ 236.257865][ T8903] CPU: 1 PID: 8903 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 236.266072][ T8903] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 236.276122][ T8903] Call Trace: [ 236.279397][ T8903] dump_stack+0x11d/0x187 [ 236.283725][ T8903] panic+0x210/0x640 [ 236.287603][ T8903] ? vprintk_func+0x89/0x13a [ 236.292181][ T8903] kcsan_report.cold+0xc/0x1a [ 236.296854][ T8903] kcsan_setup_watchpoint+0x3fb/0x440 [ 236.302205][ T8903] ktime_get_seconds+0x42/0x60 [ 236.306969][ T8903] tcp_rcv_established+0xe79/0xee0 [ 236.312058][ T8903] tcp_v4_do_rcv+0x396/0x4f0 [ 236.316623][ T8903] __release_sock+0x130/0x1e0 [ 236.321276][ T8903] release_sock+0x5e/0x160 [ 236.325669][ T8903] tcp_recvmsg+0x68e/0x1ba0 [ 236.330168][ T8903] inet_recvmsg+0xc1/0x250 [ 236.334576][ T8903] ? apparmor_socket_recvmsg+0x38/0x40 [ 236.340019][ T8903] ? inet_sendpage+0xf0/0xf0 [ 236.344759][ T8903] sock_recvmsg+0x8e/0xb0 [ 236.349067][ T8903] sock_read_iter+0x185/0x230 [ 236.353736][ T8903] new_sync_read+0x416/0x450 [ 236.358309][ T8903] __vfs_read+0x9e/0xb0 [ 236.362442][ T8903] vfs_read+0x13e/0x2b0 [ 236.366574][ T8903] ksys_read+0x16a/0x1a0 [ 236.370889][ T8903] __x64_sys_read+0x49/0x60 [ 236.375368][ T8903] do_syscall_64+0xc7/0x3b0 [ 236.379849][ T8903] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 236.385719][ T8903] RIP: 0033:0x4b3cdb [ 236.389596][ T8903] 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 [ 236.409175][ T8903] RSP: 002b:000000c000263890 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 236.417569][ T8903] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 236.426995][ T8903] RDX: 0000000000001000 RSI: 000000c00006c000 RDI: 0000000000000006 [ 236.434942][ T8903] RBP: 000000c0002638e0 R08: 0000000000000001 R09: 0000000000000002 [ 236.442906][ T8903] R10: 00000000000059e8 R11: 0000000000000206 R12: ffffffffffffffff [ 236.450956][ T8903] R13: 0000000000002000 R14: 0000000000000004 R15: 0000000000000004 [ 236.460334][ T8903] Kernel Offset: disabled [ 236.464648][ T8903] Rebooting in 86400 seconds..