[ 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 '10.128.0.253' (ECDSA) to the list of known hosts. 2020/04/21 21:10:13 fuzzer started syzkaller login: [ 44.299474][ T6735] as (6735) used greatest stack depth: 10440 bytes left 2020/04/21 21:10:15 dialing manager at 10.128.0.105:44139 2020/04/21 21:10:15 syscalls: 2960 2020/04/21 21:10:15 code coverage: enabled 2020/04/21 21:10:15 comparison tracing: enabled 2020/04/21 21:10:15 extra coverage: enabled 2020/04/21 21:10:15 setuid sandbox: enabled 2020/04/21 21:10:15 namespace sandbox: enabled 2020/04/21 21:10:15 Android sandbox: /sys/fs/selinux/policy does not exist 2020/04/21 21:10:15 fault injection: enabled 2020/04/21 21:10:15 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/04/21 21:10:15 net packet injection: enabled 2020/04/21 21:10:15 net device setup: enabled 2020/04/21 21:10:15 concurrency sanitizer: enabled 2020/04/21 21:10:15 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/04/21 21:10:15 USB emulation: /dev/raw-gadget does not exist [ 46.063397][ T6742] KCSAN: could not find function: 'poll_schedule_timeout' [ 49.957221][ T6742] KCSAN: could not find function: '_find_next_bit' 2020/04/21 21:10:20 adding functions to KCSAN blacklist: 'copy_process' 'blk_mq_sched_dispatch_requests' 'ext4_mark_iloc_dirty' 'poll_schedule_timeout' 'ext4_free_inodes_count' 'snd_seq_check_queue' 'do_wait' 'page_counter_charge' 'blk_mq_get_request' 'kauditd_thread' 'do_exit' '__filemap_fdatawrite_range' 'alloc_pid' 'mod_timer' 'atime_needs_update' 'ktime_get_real_seconds' 'xas_find_marked' 'generic_file_read_iter' 'wbt_issue' '__snd_rawmidi_transmit_ack' 'ep_poll' 'do_nanosleep' 'xas_clear_mark' 'tick_sched_do_timer' 'generic_fillattr' 'do_syslog' '__ext4_new_inode' '__add_to_page_cache_locked' 'fsnotify' 'blk_mq_dispatch_rq_list' 'generic_update_time' 'wbt_done' 'generic_write_end' 'run_timer_softirq' 'get_cpu_idle_time_us' 'pcpu_alloc' 'audit_log_start' 'tick_nohz_idle_stop_tick' 'echo_char' '_find_next_bit' 'ext4_writepages' 'exit_signals' 'find_get_pages_range_tag' 'add_timer' [ 93.995538][ T6743] ================================================================== [ 94.003880][ T6743] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 94.011874][ T6743] [ 94.014199][ T6743] write to 0xffffffff86fce8c8 of 280 bytes by interrupt on cpu 0: [ 94.022204][ T6743] timekeeping_advance+0x88e/0xd80 [ 94.027743][ T6743] update_wall_time+0x15/0x20 [ 94.032480][ T6743] tick_do_update_jiffies64+0x1e5/0x2a0 [ 94.038003][ T6743] tick_sched_do_timer+0xc7/0xd0 [ 94.042925][ T6743] tick_sched_timer+0x3f/0xd0 [ 94.047582][ T6743] __hrtimer_run_queues+0x271/0x600 [ 94.052770][ T6743] hrtimer_interrupt+0x226/0x490 [ 94.057700][ T6743] smp_apic_timer_interrupt+0xd8/0x270 [ 94.063137][ T6743] apic_timer_interrupt+0xf/0x20 [ 94.068077][ T6743] __tsan_unaligned_write4+0x33/0x110 [ 94.073462][ T6743] __rcu_read_lock+0x3c/0x50 [ 94.078054][ T6743] ip_local_deliver_finish+0xb9/0x120 [ 94.083500][ T6743] ip_local_deliver+0x135/0x220 [ 94.088355][ T6743] ip_sublist_rcv_finish+0xf0/0x140 [ 94.093618][ T6743] ip_sublist_rcv+0x3f8/0x530 [ 94.098284][ T6743] ip_list_rcv+0x2f3/0x321 [ 94.102725][ T6743] __netif_receive_skb_list_core+0x368/0x5c0 [ 94.108736][ T6743] netif_receive_skb_list_internal+0x5c7/0x810 [ 94.114874][ T6743] gro_normal_list.part.0+0x37/0xa0 [ 94.120340][ T6743] gro_normal_one+0x14c/0x160 [ 94.124999][ T6743] napi_gro_receive+0x27d/0x2f0 [ 94.129830][ T6743] receive_buf+0x252/0x2ed0 [ 94.134311][ T6743] virtnet_poll+0x343/0x790 [ 94.138791][ T6743] net_rx_action+0x3ad/0xac0 [ 94.143474][ T6743] __do_softirq+0x118/0x34a [ 94.147965][ T6743] run_ksoftirqd+0x41/0x60 [ 94.152378][ T6743] smpboot_thread_fn+0x374/0x4a0 [ 94.157314][ T6743] kthread+0x203/0x230 [ 94.161879][ T6743] ret_from_fork+0x1f/0x30 [ 94.166280][ T6743] [ 94.168875][ T6743] read to 0xffffffff86fce940 of 8 bytes by task 6743 on cpu 1: [ 94.176410][ T6743] ktime_get_seconds+0x42/0x60 [ 94.181149][ T6743] tcp_rcv_established+0xe79/0xee0 [ 94.187208][ T6743] tcp_v4_do_rcv+0x396/0x4f0 [ 94.191777][ T6743] __release_sock+0x130/0x1e0 [ 94.196432][ T6743] release_sock+0x5e/0x160 [ 94.200843][ T6743] tcp_recvmsg+0x68e/0x1ba0 [ 94.205350][ T6743] inet_recvmsg+0xc1/0x250 [ 94.209843][ T6743] sock_recvmsg+0x8e/0xb0 [ 94.214162][ T6743] sock_read_iter+0x185/0x230 [ 94.218821][ T6743] new_sync_read+0x416/0x450 [ 94.223390][ T6743] __vfs_read+0x9e/0xb0 [ 94.227524][ T6743] vfs_read+0x13e/0x2b0 [ 94.231655][ T6743] ksys_read+0x16a/0x1a0 [ 94.235888][ T6743] __x64_sys_read+0x49/0x60 [ 94.240371][ T6743] do_syscall_64+0xc7/0x3b0 [ 94.244861][ T6743] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 94.250726][ T6743] [ 94.253037][ T6743] Reported by Kernel Concurrency Sanitizer on: [ 94.259279][ T6743] CPU: 1 PID: 6743 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 94.267598][ T6743] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.277641][ T6743] ================================================================== [ 94.285697][ T6743] Kernel panic - not syncing: panic_on_warn set ... [ 94.292279][ T6743] CPU: 1 PID: 6743 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 94.300505][ T6743] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.310535][ T6743] Call Trace: [ 94.313840][ T6743] dump_stack+0x11d/0x187 [ 94.318165][ T6743] panic+0x210/0x640 [ 94.322044][ T6743] ? vprintk_func+0x89/0x13a [ 94.326618][ T6743] kcsan_report.cold+0xc/0x1a [ 94.331363][ T6743] kcsan_setup_watchpoint+0x3fb/0x440 [ 94.336718][ T6743] ktime_get_seconds+0x42/0x60 [ 94.341464][ T6743] tcp_rcv_established+0xe79/0xee0 [ 94.346557][ T6743] tcp_v4_do_rcv+0x396/0x4f0 [ 94.351154][ T6743] __release_sock+0x130/0x1e0 [ 94.355810][ T6743] release_sock+0x5e/0x160 [ 94.360228][ T6743] tcp_recvmsg+0x68e/0x1ba0 [ 94.364730][ T6743] ? preempt_schedule_common+0x32/0x80 [ 94.370190][ T6743] inet_recvmsg+0xc1/0x250 [ 94.374606][ T6743] ? apparmor_socket_recvmsg+0x38/0x40 [ 94.380043][ T6743] ? inet_sendpage+0xf0/0xf0 [ 94.384612][ T6743] sock_recvmsg+0x8e/0xb0 [ 94.388925][ T6743] sock_read_iter+0x185/0x230 [ 94.393598][ T6743] new_sync_read+0x416/0x450 [ 94.398171][ T6743] __vfs_read+0x9e/0xb0 [ 94.402317][ T6743] vfs_read+0x13e/0x2b0 [ 94.406454][ T6743] ksys_read+0x16a/0x1a0 [ 94.410675][ T6743] __x64_sys_read+0x49/0x60 [ 94.415159][ T6743] do_syscall_64+0xc7/0x3b0 [ 94.419645][ T6743] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 94.425512][ T6743] RIP: 0033:0x47c530 [ 94.429389][ T6743] 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 [ 94.448990][ T6743] RSP: 002b:000000c4202797d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 94.457416][ T6743] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 94.465764][ T6743] RDX: 0000000000001000 RSI: 000000c420232000 RDI: 0000000000000003 [ 94.473814][ T6743] RBP: 000000c420279830 R08: 0000000000000000 R09: 0000000000000000 [ 94.481763][ T6743] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 94.489713][ T6743] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 94.499221][ T6743] Kernel Offset: disabled [ 94.503573][ T6743] Rebooting in 86400 seconds..