[ 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 '10.128.0.251' (ECDSA) to the list of known hosts. 2020/12/23 01:06:31 fuzzer started 2020/12/23 01:06:31 dialing manager at 10.128.0.105:33917 2020/12/23 01:06:31 syscalls: 3466 2020/12/23 01:06:31 code coverage: enabled 2020/12/23 01:06:31 comparison tracing: enabled 2020/12/23 01:06:31 extra coverage: enabled 2020/12/23 01:06:31 setuid sandbox: enabled 2020/12/23 01:06:31 namespace sandbox: enabled 2020/12/23 01:06:31 Android sandbox: /sys/fs/selinux/policy does not exist 2020/12/23 01:06:31 fault injection: enabled 2020/12/23 01:06:31 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/12/23 01:06:31 net packet injection: enabled 2020/12/23 01:06:31 net device setup: enabled 2020/12/23 01:06:31 concurrency sanitizer: enabled 2020/12/23 01:06:31 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/12/23 01:06:31 USB emulation: enabled 2020/12/23 01:06:31 hci packet injection: enabled 2020/12/23 01:06:31 wifi device emulation: enabled 2020/12/23 01:06:34 suppressing KCSAN reports in functions: '__percpu_counter_compare' 'blk_mq_dispatch_rq_list' 'blk_mq_sched_dispatch_requests' 'ext4_free_inodes_count' 'wbt_done' '__filemap_fdatawrite_range' 'do_nanosleep' '__xa_clear_mark' 'bpf_lru_pop_free' 'kauditd_thread' 'pcpu_alloc' 'xas_clear_mark' 'do_select' 'isolate_migratepages_block' '__ext4_new_inode' 'generic_write_end' 'blk_mq_rq_ctx_init' 'alloc_pid' '__add_to_page_cache_locked' 'shmem_unlink' '__io_cqring_fill_event' '_prb_read_valid' 'dd_has_work' 'ext4_free_inode' 'wg_packet_decrypt_worker' 'futex_wait_queue_me' syzkaller login: [ 39.587352][ T8444] ================================================================== [ 39.596483][ T8444] BUG: KCSAN: data-race in do_epoll_wait / do_epoll_wait [ 39.605241][ T8444] [ 39.607607][ T8444] write to 0xffff88810d031658 of 8 bytes by task 8445 on cpu 1: [ 39.615516][ T8444] do_epoll_wait+0x4d3/0xf00 [ 39.620297][ T8444] __se_sys_epoll_pwait+0xfb/0x210 [ 39.625828][ T8444] __x64_sys_epoll_pwait+0x74/0x80 [ 39.631050][ T8444] do_syscall_64+0x39/0x80 [ 39.635497][ T8444] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 39.641583][ T8444] [ 39.643929][ T8444] read to 0xffff88810d031658 of 8 bytes by task 8444 on cpu 0: [ 39.651565][ T8444] do_epoll_wait+0x292/0xf00 [ 39.656255][ T8444] __se_sys_epoll_pwait+0xfb/0x210 [ 39.661757][ T8444] __x64_sys_epoll_pwait+0x74/0x80 [ 39.666875][ T8444] do_syscall_64+0x39/0x80 [ 39.673869][ T8444] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 39.682297][ T8444] [ 39.686530][ T8444] Reported by Kernel Concurrency Sanitizer on: [ 39.692686][ T8444] CPU: 0 PID: 8444 Comm: syz-fuzzer Not tainted 5.10.0-syzkaller #0 [ 39.700782][ T8444] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.711249][ T8444] ================================================================== [ 39.719603][ T8444] Kernel panic - not syncing: panic_on_warn set ... [ 39.726192][ T8444] CPU: 0 PID: 8444 Comm: syz-fuzzer Not tainted 5.10.0-syzkaller #0 [ 39.734357][ T8444] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.744541][ T8444] Call Trace: [ 39.748094][ T8444] dump_stack+0x116/0x15d [ 39.752618][ T8444] panic+0x1e7/0x5fa [ 39.756642][ T8444] ? vprintk_emit+0x2e2/0x360 [ 39.762497][ T8444] kcsan_report+0x67b/0x680 [ 39.767041][ T8444] ? kcsan_setup_watchpoint+0x47b/0x4e0 [ 39.772693][ T8444] ? do_epoll_wait+0x292/0xf00 [ 39.777946][ T8444] ? __se_sys_epoll_pwait+0xfb/0x210 [ 39.783370][ T8444] ? __x64_sys_epoll_pwait+0x74/0x80 [ 39.788758][ T8444] ? do_syscall_64+0x39/0x80 [ 39.794237][ T8444] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 39.800448][ T8444] ? sock_do_ioctl+0xa0/0x210 [ 39.805493][ T8444] kcsan_setup_watchpoint+0x47b/0x4e0 [ 39.811144][ T8444] do_epoll_wait+0x292/0xf00 [ 39.815856][ T8444] ? vfs_read+0x3ce/0x5c0 [ 39.820563][ T8444] __se_sys_epoll_pwait+0xfb/0x210 [ 39.825692][ T8444] __x64_sys_epoll_pwait+0x74/0x80 [ 39.830808][ T8444] do_syscall_64+0x39/0x80 [ 39.835230][ T8444] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 39.841495][ T8444] RIP: 0033:0x469240 [ 39.845392][ T8444] Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 c7 [ 39.865094][ T8444] RSP: 002b:000000c0000497f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 39.873532][ T8444] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 0000000000469240 [ 39.881506][ T8444] RDX: 0000000000000080 RSI: 000000c000049840 RDI: 0000000000000003 [ 39.889475][ T8444] RBP: 000000c000049e40 R08: 0000000000000000 R09: 0000000000000000 [ 39.897552][ T8444] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000003 [ 39.905543][ T8444] R13: 000000c000000f00 R14: 0000000000000002 R15: 0000000000000002 [ 39.913995][ T8444] Kernel Offset: disabled [ 39.918356][ T8444] Rebooting in 86400 seconds..