[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ 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 '10.128.0.122' (ECDSA) to the list of known hosts. 2020/05/24 15:26:48 fuzzer started 2020/05/24 15:26:48 dialing manager at 10.128.0.105:40647 2020/05/24 15:27:03 syscalls: 3055 2020/05/24 15:27:03 code coverage: enabled 2020/05/24 15:27:03 comparison tracing: enabled 2020/05/24 15:27:03 extra coverage: enabled 2020/05/24 15:27:03 setuid sandbox: enabled 2020/05/24 15:27:03 namespace sandbox: enabled 2020/05/24 15:27:03 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/24 15:27:03 fault injection: enabled 2020/05/24 15:27:03 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/24 15:27:03 net packet injection: enabled 2020/05/24 15:27:03 net device setup: enabled 2020/05/24 15:27:03 concurrency sanitizer: enabled 2020/05/24 15:27:03 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/24 15:27:03 USB emulation: enabled syzkaller login: [ 67.528280][ T8937] KCSAN: could not find function: '_find_next_bit' 2020/05/24 15:27:07 adding functions to KCSAN blacklist: 'run_timer_softirq' 'do_exit' 'shmem_file_read_iter' 'pcpu_alloc' 'kauditd_thread' 'ep_poll' 'generic_fillattr' 'ext4_free_inodes_count' 'blk_mq_get_request' 'install_new_memslots' 'xas_find_marked' '__delete_from_page_cache' 'io_sq_thread' '__snd_rawmidi_transmit_ack' 'copy_process' 'blk_mq_dispatch_rq_list' 'echo_char' 'tick_sched_do_timer' '_find_next_bit' 'tick_nohz_idle_stop_tick' 'ext4_mb_find_by_goal' 'n_tty_receive_buf_common' 'page_counter_charge' 'do_nanosleep' '__mark_inode_dirty' 'vm_area_dup' 'blk_mq_sched_dispatch_requests' 'alloc_pid' 'find_get_pages_range_tag' 'generic_write_end' '__add_to_page_cache_locked' '__mpage_writepage' 'ext4_mark_iloc_dirty' 'mod_timer' 'dd_has_work' '__ext4_new_inode' [ 159.003404][ T8923] ================================================================== [ 159.011679][ T8923] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 159.019565][ T8923] [ 159.021893][ T8923] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 1: [ 159.029670][ T8923] timekeeping_advance+0x88e/0xd80 [ 159.034780][ T8923] update_wall_time+0x15/0x20 [ 159.039447][ T8923] tick_do_update_jiffies64+0x1e5/0x2a0 [ 159.044987][ T8923] tick_sched_do_timer+0xc7/0xd0 [ 159.049908][ T8923] tick_sched_timer+0x3f/0xd0 [ 159.054571][ T8923] __hrtimer_run_queues+0x271/0x600 [ 159.059743][ T8923] hrtimer_interrupt+0x226/0x490 [ 159.064656][ T8923] smp_apic_timer_interrupt+0xd8/0x270 [ 159.070089][ T8923] apic_timer_interrupt+0xf/0x20 [ 159.075006][ T8923] __sanitizer_cov_trace_pc+0x0/0x50 [ 159.080278][ T8923] dev_gro_receive+0x1e5/0x10f0 [ 159.085122][ T8923] napi_gro_receive+0x76/0x2f0 [ 159.089868][ T8923] receive_buf+0x24c/0x3420 [ 159.094443][ T8923] virtnet_poll+0x343/0x790 [ 159.098939][ T8923] net_rx_action+0x3ad/0xac0 [ 159.103515][ T8923] __do_softirq+0x118/0x34a [ 159.108016][ T8923] run_ksoftirqd+0x41/0x60 [ 159.112407][ T8923] smpboot_thread_fn+0x374/0x4a0 [ 159.117331][ T8923] kthread+0x203/0x230 [ 159.121397][ T8923] ret_from_fork+0x1f/0x30 [ 159.125792][ T8923] [ 159.128113][ T8923] read to 0xffffffff88ae9140 of 8 bytes by task 8923 on cpu 0: [ 159.135654][ T8923] ktime_get_seconds+0x42/0x60 [ 159.140400][ T8923] tcp_rcv_established+0xe79/0xee0 [ 159.145497][ T8923] tcp_v4_do_rcv+0x396/0x4f0 [ 159.150079][ T8923] __release_sock+0x130/0x1e0 [ 159.154738][ T8923] release_sock+0x5e/0x160 [ 159.159192][ T8923] tcp_recvmsg+0x68e/0x1ba0 [ 159.163719][ T8923] inet_recvmsg+0xc1/0x250 [ 159.168129][ T8923] sock_recvmsg+0x8e/0xb0 [ 159.172437][ T8923] sock_read_iter+0x185/0x230 [ 159.177096][ T8923] new_sync_read+0x416/0x450 [ 159.181661][ T8923] __vfs_read+0x9e/0xb0 [ 159.185812][ T8923] vfs_read+0x13e/0x2b0 [ 159.189959][ T8923] ksys_read+0x16a/0x1a0 [ 159.194173][ T8923] __x64_sys_read+0x49/0x60 [ 159.198663][ T8923] do_syscall_64+0xc7/0x3b0 [ 159.203143][ T8923] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 159.209260][ T8923] [ 159.211578][ T8923] Reported by Kernel Concurrency Sanitizer on: [ 159.217709][ T8923] CPU: 0 PID: 8923 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 159.225922][ T8923] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 159.235955][ T8923] ================================================================== [ 159.243990][ T8923] Kernel panic - not syncing: panic_on_warn set ... [ 159.250563][ T8923] CPU: 0 PID: 8923 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 159.258768][ T8923] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 159.268795][ T8923] Call Trace: [ 159.272151][ T8923] dump_stack+0x11d/0x187 [ 159.276470][ T8923] panic+0x210/0x640 [ 159.280345][ T8923] ? vprintk_func+0x89/0x13a [ 159.284919][ T8923] kcsan_report.cold+0xc/0x1a [ 159.289589][ T8923] kcsan_setup_watchpoint+0x3fb/0x440 [ 159.294942][ T8923] ktime_get_seconds+0x42/0x60 [ 159.299703][ T8923] tcp_rcv_established+0xe79/0xee0 [ 159.304870][ T8923] tcp_v4_do_rcv+0x396/0x4f0 [ 159.309470][ T8923] __release_sock+0x130/0x1e0 [ 159.314133][ T8923] release_sock+0x5e/0x160 [ 159.318541][ T8923] tcp_recvmsg+0x68e/0x1ba0 [ 159.323055][ T8923] inet_recvmsg+0xc1/0x250 [ 159.327476][ T8923] ? apparmor_socket_recvmsg+0x38/0x40 [ 159.332912][ T8923] ? inet_sendpage+0xf0/0xf0 [ 159.337489][ T8923] sock_recvmsg+0x8e/0xb0 [ 159.341807][ T8923] sock_read_iter+0x185/0x230 [ 159.346636][ T8923] new_sync_read+0x416/0x450 [ 159.351283][ T8923] __vfs_read+0x9e/0xb0 [ 159.355424][ T8923] vfs_read+0x13e/0x2b0 [ 159.359558][ T8923] ksys_read+0x16a/0x1a0 [ 159.363816][ T8923] __x64_sys_read+0x49/0x60 [ 159.368312][ T8923] do_syscall_64+0xc7/0x3b0 [ 159.372803][ T8923] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 159.378758][ T8923] RIP: 0033:0x47c530 [ 159.382640][ T8923] 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 [ 159.402230][ T8923] RSP: 002b:000000c4204c57d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 159.410647][ T8923] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 159.418619][ T8923] RDX: 0000000000001000 RSI: 000000c4201e2000 RDI: 0000000000000003 [ 159.426578][ T8923] RBP: 000000c4204c5830 R08: 0000000000000000 R09: 0000000000000000 [ 159.434537][ T8923] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000004 [ 159.442486][ T8923] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 159.451799][ T8923] Kernel Offset: disabled [ 159.456125][ T8923] Rebooting in 86400 seconds..