[ 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 '10.128.10.31' (ECDSA) to the list of known hosts. 2020/06/07 17:36:47 fuzzer started 2020/06/07 17:36:47 dialing manager at 10.128.0.105:43689 2020/06/07 17:36:47 syscalls: 3055 2020/06/07 17:36:47 code coverage: enabled 2020/06/07 17:36:47 comparison tracing: enabled 2020/06/07 17:36:47 extra coverage: enabled 2020/06/07 17:36:47 setuid sandbox: enabled 2020/06/07 17:36:47 namespace sandbox: enabled 2020/06/07 17:36:47 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/07 17:36:47 fault injection: enabled 2020/06/07 17:36:47 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/07 17:36:47 net packet injection: enabled 2020/06/07 17:36:47 net device setup: enabled 2020/06/07 17:36:47 concurrency sanitizer: enabled 2020/06/07 17:36:47 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/07 17:36:47 USB emulation: enabled syzkaller login: [ 53.417603][ T8913] KCSAN: could not find function: '_find_next_bit' 2020/06/07 17:36:53 adding functions to KCSAN blacklist: 'find_get_pages_range_tag' '__snd_rawmidi_transmit_ack' 'add_timer' 'generic_fillattr' '__process_echoes' 'kauditd_thread' 'file_update_time' 'page_counter_charge' 'pcpu_alloc' '__delete_from_page_cache' 'blk_mq_sched_dispatch_requests' 'ext4_mark_iloc_dirty' 'ep_poll' '_find_next_bit' 'copy_process' 'tick_nohz_idle_stop_tick' 'atime_needs_update' 'mod_timer' 'do_exit' 'n_tty_receive_buf_common' 'generic_write_end' 'tick_nohz_next_event' 'futex_wait_queue_me' 'xas_clear_mark' 'blk_mq_get_request' '__mark_inode_dirty' 'ktime_get_real_seconds' 'blk_mq_dispatch_rq_list' 'tick_sched_do_timer' 'do_nanosleep' 'direct_page_fault' 'io_sq_thread' 'run_timer_softirq' 'wbt_done' '__ext4_new_inode' 'ext4_free_inodes_count' 'echo_char' 'dd_has_work' 'decrypt_packet' 'shmem_getpage_gfp' 'snd_seq_check_queue' [ 93.997615][ T8903] ================================================================== [ 94.005745][ T8903] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 94.013612][ T8903] [ 94.015970][ T8903] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 1: [ 94.023829][ T8903] timekeeping_advance+0x88e/0xd80 [ 94.028971][ T8903] update_wall_time+0x15/0x20 [ 94.033624][ T8903] tick_do_update_jiffies64+0x1e5/0x2a0 [ 94.039154][ T8903] tick_sched_do_timer+0xc7/0xd0 [ 94.044068][ T8903] tick_sched_timer+0x3f/0xd0 [ 94.048722][ T8903] __hrtimer_run_queues+0x271/0x600 [ 94.053894][ T8903] hrtimer_interrupt+0x226/0x490 [ 94.058810][ T8903] smp_apic_timer_interrupt+0xd8/0x270 [ 94.064257][ T8903] apic_timer_interrupt+0xf/0x20 [ 94.069169][ T8903] memcpy_erms+0x6/0x10 [ 94.073734][ T8903] page_to_skb+0x190/0x5f0 [ 94.078126][ T8903] receive_buf+0x1af3/0x3420 [ 94.082691][ T8903] virtnet_poll+0x343/0x790 [ 94.087185][ T8903] net_rx_action+0x3ad/0xac0 [ 94.091750][ T8903] __do_softirq+0x118/0x34a [ 94.096234][ T8903] run_ksoftirqd+0x41/0x60 [ 94.100626][ T8903] smpboot_thread_fn+0x374/0x4a0 [ 94.105553][ T8903] kthread+0x203/0x230 [ 94.109608][ T8903] ret_from_fork+0x1f/0x30 [ 94.114004][ T8903] [ 94.116320][ T8903] read to 0xffffffff88ae9140 of 8 bytes by task 8903 on cpu 0: [ 94.123857][ T8903] ktime_get_seconds+0x42/0x60 [ 94.128598][ T8903] tcp_rcv_established+0xe79/0xee0 [ 94.133698][ T8903] tcp_v4_do_rcv+0x396/0x4f0 [ 94.138301][ T8903] __release_sock+0x130/0x1e0 [ 94.143556][ T8903] release_sock+0x5e/0x160 [ 94.148055][ T8903] tcp_recvmsg+0x68e/0x1ba0 [ 94.152560][ T8903] inet_recvmsg+0xc1/0x250 [ 94.156960][ T8903] sock_recvmsg+0x8e/0xb0 [ 94.161281][ T8903] sock_read_iter+0x185/0x230 [ 94.165969][ T8903] new_sync_read+0x416/0x450 [ 94.170637][ T8903] __vfs_read+0x9e/0xb0 [ 94.174779][ T8903] vfs_read+0x13e/0x2b0 [ 94.178908][ T8903] ksys_read+0x16a/0x1a0 [ 94.183126][ T8903] __x64_sys_read+0x49/0x60 [ 94.187952][ T8903] do_syscall_64+0xc7/0x3b0 [ 94.192432][ T8903] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 94.198305][ T8903] [ 94.200607][ T8903] Reported by Kernel Concurrency Sanitizer on: [ 94.206739][ T8903] CPU: 0 PID: 8903 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 94.214946][ T8903] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.225072][ T8903] ================================================================== [ 94.233106][ T8903] Kernel panic - not syncing: panic_on_warn set ... [ 94.239682][ T8903] CPU: 0 PID: 8903 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 94.247891][ T8903] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.257929][ T8903] Call Trace: [ 94.261212][ T8903] dump_stack+0x11d/0x187 [ 94.265588][ T8903] panic+0x210/0x640 [ 94.269558][ T8903] ? vprintk_func+0x89/0x13a [ 94.274134][ T8903] kcsan_report.cold+0xc/0x1a [ 94.278796][ T8903] kcsan_setup_watchpoint+0x3fb/0x440 [ 94.284208][ T8903] ktime_get_seconds+0x42/0x60 [ 94.288955][ T8903] tcp_rcv_established+0xe79/0xee0 [ 94.294133][ T8903] tcp_v4_do_rcv+0x396/0x4f0 [ 94.298717][ T8903] __release_sock+0x130/0x1e0 [ 94.303408][ T8903] release_sock+0x5e/0x160 [ 94.307816][ T8903] tcp_recvmsg+0x68e/0x1ba0 [ 94.312362][ T8903] inet_recvmsg+0xc1/0x250 [ 94.316761][ T8903] ? apparmor_socket_recvmsg+0x38/0x40 [ 94.322212][ T8903] ? inet_sendpage+0xf0/0xf0 [ 94.326779][ T8903] sock_recvmsg+0x8e/0xb0 [ 94.331086][ T8903] sock_read_iter+0x185/0x230 [ 94.335761][ T8903] new_sync_read+0x416/0x450 [ 94.340337][ T8903] __vfs_read+0x9e/0xb0 [ 94.344482][ T8903] vfs_read+0x13e/0x2b0 [ 94.348614][ T8903] ksys_read+0x16a/0x1a0 [ 94.352844][ T8903] __x64_sys_read+0x49/0x60 [ 94.357329][ T8903] do_syscall_64+0xc7/0x3b0 [ 94.361814][ T8903] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 94.367794][ T8903] RIP: 0033:0x4b3cdb [ 94.371689][ 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 [ 94.391389][ T8903] RSP: 002b:000000c0001d5890 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 94.399785][ T8903] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b3cdb [ 94.408712][ T8903] RDX: 0000000000001000 RSI: 000000c0003f6000 RDI: 0000000000000006 [ 94.423182][ T8903] RBP: 000000c0001d58e0 R08: 00007ffcff8ca001 R09: 000000000000005e [ 94.431135][ T8903] R10: 0000000000000072 R11: 0000000000000206 R12: 0000000000000003 [ 94.439098][ T8903] R13: 000000c0000b0180 R14: 0000000000000040 R15: 0000000000000008 [ 94.448851][ T8903] Kernel Offset: disabled [ 94.453193][ T8903] Rebooting in 86400 seconds..