[ 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 '10.128.0.30' (ECDSA) to the list of known hosts. 2020/04/28 12:30:00 fuzzer started 2020/04/28 12:30:02 dialing manager at 10.128.0.105:40209 syzkaller login: [ 46.517168][ T6731] ld (6731) used greatest stack depth: 10440 bytes left 2020/04/28 12:30:10 syscalls: 2960 2020/04/28 12:30:10 code coverage: enabled 2020/04/28 12:30:10 comparison tracing: enabled 2020/04/28 12:30:10 extra coverage: enabled 2020/04/28 12:30:10 setuid sandbox: enabled 2020/04/28 12:30:10 namespace sandbox: enabled 2020/04/28 12:30:10 Android sandbox: /sys/fs/selinux/policy does not exist 2020/04/28 12:30:10 fault injection: enabled 2020/04/28 12:30:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/04/28 12:30:10 net packet injection: enabled 2020/04/28 12:30:10 net device setup: enabled 2020/04/28 12:30:10 concurrency sanitizer: enabled 2020/04/28 12:30:10 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/04/28 12:30:10 USB emulation: /dev/raw-gadget does not exist [ 56.291815][ T6734] KCSAN: could not find function: '_find_next_bit' 2020/04/28 12:30:13 adding functions to KCSAN blacklist: 'alloc_pid' 'do_nanosleep' '__delete_from_page_cache' 'dd_has_work' 'do_exit' 'do_signal_stop' 'blk_mq_get_request' 'page_counter_charge' 'n_tty_receive_buf_common' 'kauditd_thread' 'generic_write_end' 'futex_wait_queue_me' '__snd_rawmidi_transmit_ack' 'blk_mq_sched_dispatch_requests' '_find_next_bit' 'ext4_mark_iloc_dirty' 'copy_process' 'blk_mq_dispatch_rq_list' 'echo_char' 'xas_clear_mark' 'ep_poll' 'find_get_pages_range_tag' 'audit_log_start' 'tick_sched_do_timer' '__ext4_new_inode' 'run_timer_softirq' 'mod_timer' 'step_into' [ 73.994061][ T6735] ================================================================== [ 74.002212][ T6735] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 74.010182][ T6735] [ 74.012491][ T6735] write to 0xffffffff86fce8c8 of 280 bytes by interrupt on cpu 1: [ 74.020366][ T6735] timekeeping_advance+0x88e/0xd80 [ 74.025470][ T6735] update_wall_time+0x15/0x20 [ 74.030143][ T6735] tick_do_update_jiffies64+0x1e5/0x2a0 [ 74.035667][ T6735] tick_sched_do_timer+0xc7/0xd0 [ 74.040583][ T6735] tick_sched_timer+0x3f/0xd0 [ 74.045239][ T6735] __hrtimer_run_queues+0x271/0x600 [ 74.050416][ T6735] hrtimer_interrupt+0x226/0x490 [ 74.055425][ T6735] smp_apic_timer_interrupt+0xd8/0x270 [ 74.060882][ T6735] apic_timer_interrupt+0xf/0x20 [ 74.065811][ T6735] __tsan_unaligned_write8+0x9e/0x110 [ 74.071161][ T6735] __netif_receive_skb_core+0x1768/0x2120 [ 74.076886][ T6735] __netif_receive_skb_list_core+0x2b1/0x5c0 [ 74.082854][ T6735] netif_receive_skb_list_internal+0x5c7/0x810 [ 74.088985][ T6735] gro_normal_list.part.0+0x37/0xa0 [ 74.094330][ T6735] gro_normal_one+0x14c/0x160 [ 74.098982][ T6735] napi_gro_receive+0x27d/0x2f0 [ 74.103810][ T6735] receive_buf+0x252/0x2ed0 [ 74.108289][ T6735] virtnet_poll+0x343/0x790 [ 74.112786][ T6735] net_rx_action+0x3ad/0xac0 [ 74.117376][ T6735] __do_softirq+0x118/0x34a [ 74.121868][ T6735] run_ksoftirqd+0x41/0x60 [ 74.126266][ T6735] smpboot_thread_fn+0x374/0x4a0 [ 74.131186][ T6735] kthread+0x203/0x230 [ 74.135232][ T6735] ret_from_fork+0x1f/0x30 [ 74.139625][ T6735] [ 74.141938][ T6735] read to 0xffffffff86fce940 of 8 bytes by task 6735 on cpu 0: [ 74.149483][ T6735] ktime_get_seconds+0x42/0x60 [ 74.154232][ T6735] tcp_rcv_established+0xe79/0xee0 [ 74.159331][ T6735] tcp_v4_do_rcv+0x396/0x4f0 [ 74.163899][ T6735] __release_sock+0x130/0x1e0 [ 74.168551][ T6735] release_sock+0x5e/0x160 [ 74.172958][ T6735] tcp_recvmsg+0x68e/0x1ba0 [ 74.177436][ T6735] inet_recvmsg+0xc1/0x250 [ 74.181830][ T6735] sock_recvmsg+0x8e/0xb0 [ 74.186142][ T6735] sock_read_iter+0x185/0x230 [ 74.190863][ T6735] new_sync_read+0x416/0x450 [ 74.195442][ T6735] __vfs_read+0x9e/0xb0 [ 74.199577][ T6735] vfs_read+0x13e/0x2b0 [ 74.203731][ T6735] ksys_read+0x16a/0x1a0 [ 74.207960][ T6735] __x64_sys_read+0x49/0x60 [ 74.212467][ T6735] do_syscall_64+0xc7/0x3b0 [ 74.216960][ T6735] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.222932][ T6735] [ 74.225279][ T6735] Reported by Kernel Concurrency Sanitizer on: [ 74.231474][ T6735] CPU: 0 PID: 6735 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 74.239804][ T6735] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.250288][ T6735] ================================================================== [ 74.258336][ T6735] Kernel panic - not syncing: panic_on_warn set ... [ 74.264991][ T6735] CPU: 0 PID: 6735 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 74.273199][ T6735] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.283234][ T6735] Call Trace: [ 74.286520][ T6735] dump_stack+0x11d/0x187 [ 74.290826][ T6735] panic+0x210/0x640 [ 74.294698][ T6735] ? vprintk_func+0x89/0x13a [ 74.299277][ T6735] kcsan_report.cold+0xc/0x1a [ 74.303938][ T6735] kcsan_setup_watchpoint+0x3fb/0x440 [ 74.309294][ T6735] ktime_get_seconds+0x42/0x60 [ 74.314064][ T6735] tcp_rcv_established+0xe79/0xee0 [ 74.319167][ T6735] tcp_v4_do_rcv+0x396/0x4f0 [ 74.323754][ T6735] __release_sock+0x130/0x1e0 [ 74.328766][ T6735] release_sock+0x5e/0x160 [ 74.333177][ T6735] tcp_recvmsg+0x68e/0x1ba0 [ 74.337684][ T6735] inet_recvmsg+0xc1/0x250 [ 74.342084][ T6735] ? apparmor_socket_recvmsg+0x38/0x40 [ 74.347567][ T6735] ? inet_sendpage+0xf0/0xf0 [ 74.352199][ T6735] sock_recvmsg+0x8e/0xb0 [ 74.356512][ T6735] sock_read_iter+0x185/0x230 [ 74.361176][ T6735] new_sync_read+0x416/0x450 [ 74.365750][ T6735] __vfs_read+0x9e/0xb0 [ 74.370057][ T6735] vfs_read+0x13e/0x2b0 [ 74.374188][ T6735] ksys_read+0x16a/0x1a0 [ 74.378579][ T6735] __x64_sys_read+0x49/0x60 [ 74.383061][ T6735] do_syscall_64+0xc7/0x3b0 [ 74.387550][ T6735] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.393514][ T6735] RIP: 0033:0x47c530 [ 74.397407][ T6735] 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 [ 74.417340][ T6735] RSP: 002b:000000c42027d7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 74.425732][ T6735] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 74.433769][ T6735] RDX: 0000000000001000 RSI: 000000c420456000 RDI: 0000000000000003 [ 74.441719][ T6735] RBP: 000000c42027d830 R08: 0000000000000000 R09: 0000000000000000 [ 74.449668][ T6735] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000020 [ 74.457626][ T6735] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 74.467140][ T6735] Kernel Offset: disabled [ 74.471476][ T6735] Rebooting in 86400 seconds..