[ 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 '10.128.0.46' (ECDSA) to the list of known hosts. 2020/06/10 18:43:31 fuzzer started 2020/06/10 18:43:32 dialing manager at 10.128.0.105:34607 2020/06/10 18:43:32 syscalls: 3076 2020/06/10 18:43:32 code coverage: enabled 2020/06/10 18:43:32 comparison tracing: enabled 2020/06/10 18:43:32 extra coverage: enabled 2020/06/10 18:43:32 setuid sandbox: enabled 2020/06/10 18:43:32 namespace sandbox: enabled 2020/06/10 18:43:32 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/10 18:43:32 fault injection: enabled 2020/06/10 18:43:32 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/10 18:43:32 net packet injection: enabled 2020/06/10 18:43:32 net device setup: enabled 2020/06/10 18:43:32 concurrency sanitizer: enabled 2020/06/10 18:43:32 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/10 18:43:32 USB emulation: enabled syzkaller login: [ 53.250680][ T8919] KCSAN: could not find function: '_find_next_bit' 2020/06/10 18:43:36 adding functions to KCSAN blacklist: 'find_get_pages_range_tag' 'generic_write_end' '_find_next_bit' 'pcpu_alloc' 'do_signal_stop' 'tick_nohz_idle_stop_tick' 'file_update_time' '__get_user_pages' 'wbt_done' 'ext4_free_inodes_count' 'ext4_mark_iloc_dirty' 'dd_has_work' 'tick_nohz_next_event' 'ext4_handle_inode_extension' 'copy_process' 'blk_mq_dispatch_rq_list' 'blk_mq_get_request' 'do_nanosleep' 'blk_mq_sched_dispatch_requests' 'page_counter_charge' 'wg_packet_send_staged_packets' 'run_timer_softirq' 'echo_char' 'tick_sched_do_timer' '__delete_from_page_cache' 'ptrace_check_attach' 'xas_clear_mark' 'mod_timer' 'commit_echoes' 'generic_fillattr' 'futex_wait_queue_me' 'ep_poll' '__ext4_new_inode' 'ktime_get_real_seconds' 'ext4_da_write_end' [ 66.003701][ T8910] ================================================================== [ 66.011829][ T8910] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 66.019708][ T8910] [ 66.022036][ T8910] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 1: [ 66.029855][ T8910] timekeeping_advance+0x88e/0xd80 [ 66.034954][ T8910] update_wall_time+0x15/0x20 [ 66.039622][ T8910] tick_do_update_jiffies64+0x1e5/0x2a0 [ 66.045144][ T8910] tick_sched_do_timer+0xc7/0xd0 [ 66.050056][ T8910] tick_sched_timer+0x3f/0xd0 [ 66.054723][ T8910] __hrtimer_run_queues+0x271/0x600 [ 66.059894][ T8910] hrtimer_interrupt+0x226/0x490 [ 66.065413][ T8910] smp_apic_timer_interrupt+0xd8/0x270 [ 66.070857][ T8910] apic_timer_interrupt+0xf/0x20 [ 66.075768][ T8910] __tsan_read8+0x0/0x110 [ 66.080073][ T8910] ipt_do_table+0x406/0xe70 [ 66.084551][ T8910] iptable_raw_hook+0x44/0x60 [ 66.089205][ T8910] nf_hook_slow+0x7c/0x160 [ 66.093609][ T8910] nf_hook_slow_list+0x140/0x29f [ 66.098523][ T8910] ip_sublist_rcv+0x4f9/0x530 [ 66.103242][ T8910] ip_list_rcv+0x2f3/0x321 [ 66.107649][ T8910] __netif_receive_skb_list_core+0x368/0x5c0 [ 66.113618][ T8910] netif_receive_skb_list_internal+0x5c7/0x810 [ 66.119748][ T8910] gro_normal_list.part.0+0x37/0xa0 [ 66.124936][ T8910] gro_normal_one+0x14c/0x160 [ 66.129587][ T8910] napi_gro_receive+0x27d/0x2f0 [ 66.134414][ T8910] receive_buf+0x24c/0x3420 [ 66.138906][ T8910] virtnet_poll+0x343/0x790 [ 66.143382][ T8910] net_rx_action+0x3ad/0xac0 [ 66.147959][ T8910] __do_softirq+0x118/0x34a [ 66.152449][ T8910] run_ksoftirqd+0x41/0x60 [ 66.156846][ T8910] smpboot_thread_fn+0x374/0x4a0 [ 66.161771][ T8910] kthread+0x203/0x230 [ 66.165817][ T8910] ret_from_fork+0x1f/0x30 [ 66.170212][ T8910] [ 66.172606][ T8910] read to 0xffffffff88ae9140 of 8 bytes by task 8910 on cpu 0: [ 66.180133][ T8910] ktime_get_seconds+0x42/0x60 [ 66.184883][ T8910] tcp_rcv_established+0xe79/0xee0 [ 66.189968][ T8910] tcp_v4_do_rcv+0x396/0x4f0 [ 66.194530][ T8910] __release_sock+0x130/0x1e0 [ 66.199179][ T8910] release_sock+0x5e/0x160 [ 66.203567][ T8910] tcp_recvmsg+0x68e/0x1ba0 [ 66.208052][ T8910] inet_recvmsg+0xc1/0x250 [ 66.212445][ T8910] sock_recvmsg+0x8e/0xb0 [ 66.216748][ T8910] sock_read_iter+0x185/0x230 [ 66.221400][ T8910] new_sync_read+0x416/0x450 [ 66.225979][ T8910] __vfs_read+0x9e/0xb0 [ 66.230109][ T8910] vfs_read+0x13e/0x2b0 [ 66.234287][ T8910] ksys_read+0x16a/0x1a0 [ 66.238513][ T8910] __x64_sys_read+0x49/0x60 [ 66.243003][ T8910] do_syscall_64+0xc7/0x3b0 [ 66.247502][ T8910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.253359][ T8910] [ 66.255666][ T8910] Reported by Kernel Concurrency Sanitizer on: [ 66.261805][ T8910] CPU: 0 PID: 8910 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 66.270034][ T8910] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.280081][ T8910] ================================================================== [ 66.288214][ T8910] Kernel panic - not syncing: panic_on_warn set ... [ 66.294777][ T8910] CPU: 0 PID: 8910 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 66.303589][ T8910] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.313621][ T8910] Call Trace: [ 66.316892][ T8910] dump_stack+0x11d/0x187 [ 66.321210][ T8910] panic+0x210/0x640 [ 66.325100][ T8910] ? vprintk_func+0x89/0x13a [ 66.329986][ T8910] kcsan_report.cold+0xc/0x1a [ 66.334654][ T8910] kcsan_setup_watchpoint+0x3fb/0x440 [ 66.340008][ T8910] ktime_get_seconds+0x42/0x60 [ 66.344763][ T8910] tcp_rcv_established+0xe79/0xee0 [ 66.349947][ T8910] tcp_v4_do_rcv+0x396/0x4f0 [ 66.355243][ T8910] __release_sock+0x130/0x1e0 [ 66.359903][ T8910] release_sock+0x5e/0x160 [ 66.364458][ T8910] tcp_recvmsg+0x68e/0x1ba0 [ 66.368965][ T8910] inet_recvmsg+0xc1/0x250 [ 66.373379][ T8910] ? apparmor_socket_recvmsg+0x38/0x40 [ 66.378824][ T8910] ? inet_sendpage+0xf0/0xf0 [ 66.383401][ T8910] sock_recvmsg+0x8e/0xb0 [ 66.387865][ T8910] sock_read_iter+0x185/0x230 [ 66.392982][ T8910] new_sync_read+0x416/0x450 [ 66.397566][ T8910] __vfs_read+0x9e/0xb0 [ 66.401708][ T8910] vfs_read+0x13e/0x2b0 [ 66.405945][ T8910] ksys_read+0x16a/0x1a0 [ 66.410228][ T8910] __x64_sys_read+0x49/0x60 [ 66.414712][ T8910] do_syscall_64+0xc7/0x3b0 [ 66.419196][ T8910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.425064][ T8910] RIP: 0033:0x4b3cdb [ 66.428956][ T8910] 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 [ 66.448535][ T8910] RSP: 002b:000000c0003338a8 EFLAGS: 00000216 ORIG_RAX: 0000000000000000 [ 66.456926][ T8910] RAX: ffffffffffffffda RBX: 000000c00002e800 RCX: 00000000004b3cdb [ 66.464885][ T8910] RDX: 0000000000001000 RSI: 000000c00034e000 RDI: 0000000000000006 [ 66.472910][ T8910] RBP: 000000c0003338f8 R08: 0000000000000000 R09: 0000000000000000 [ 66.481008][ T8910] R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000000003 [ 66.489222][ T8910] R13: 000000c000092780 R14: 0000000000000020 R15: 0000000000000004 [ 66.498503][ T8910] Kernel Offset: disabled [ 66.502835][ T8910] Rebooting in 86400 seconds..