[ 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. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 44.042901][ T8893] bash (8893) used greatest stack depth: 10456 bytes left Warning: Permanently added '10.128.0.138' (ECDSA) to the list of known hosts. 2020/06/08 10:28:29 fuzzer started 2020/06/08 10:28:29 dialing manager at 10.128.0.105:38613 2020/06/08 10:28:30 syscalls: 3055 2020/06/08 10:28:30 code coverage: enabled 2020/06/08 10:28:30 comparison tracing: enabled 2020/06/08 10:28:30 extra coverage: enabled 2020/06/08 10:28:30 setuid sandbox: enabled 2020/06/08 10:28:30 namespace sandbox: enabled 2020/06/08 10:28:30 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/08 10:28:30 fault injection: enabled 2020/06/08 10:28:30 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/08 10:28:30 net packet injection: enabled 2020/06/08 10:28:30 net device setup: enabled 2020/06/08 10:28:30 concurrency sanitizer: enabled 2020/06/08 10:28:30 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/08 10:28:30 USB emulation: enabled [ 52.652076][ T8930] KCSAN: could not find function: '_find_next_bit' 2020/06/08 10:28:30 adding functions to KCSAN blacklist: '_find_next_bit' 'blk_mq_dispatch_rq_list' [ 53.058195][ T8921] ================================================================== [ 53.066306][ T8921] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 53.075351][ T8921] [ 53.078755][ T8921] write to 0xffff888129d72d10 of 8 bytes by interrupt on cpu 1: [ 53.087873][ T8921] ep_poll_callback+0x5f2/0x6c0 [ 53.093343][ T8921] __wake_up_common+0x76/0x180 [ 53.098099][ T8921] __wake_up_common_lock+0x77/0xb0 [ 53.103191][ T8921] sock_def_readable+0x9d/0x130 [ 53.108687][ T8921] tcp_data_ready+0x76/0xc0 [ 53.113454][ T8921] tcp_rcv_established+0xcb8/0xee0 [ 53.119839][ T8921] tcp_v4_do_rcv+0x396/0x4f0 [ 53.124888][ T8921] tcp_v4_rcv+0x1c55/0x1e10 [ 53.129390][ T8921] ip_protocol_deliver_rcu+0x4b/0x410 [ 53.134760][ T8921] ip_local_deliver_finish+0xf3/0x120 [ 53.140118][ T8921] ip_local_deliver+0x135/0x220 [ 53.145034][ T8921] ip_sublist_rcv_finish+0xf0/0x140 [ 53.150224][ T8921] ip_sublist_rcv+0x3f8/0x530 [ 53.156237][ T8921] ip_list_rcv+0x2f3/0x321 [ 53.161715][ T8921] __netif_receive_skb_list_core+0x368/0x5c0 [ 53.168169][ T8921] netif_receive_skb_list_internal+0x5c7/0x810 [ 53.175078][ T8921] gro_normal_list.part.0+0x37/0xa0 [ 53.182340][ T8921] gro_normal_one+0x14c/0x160 [ 53.187536][ T8921] napi_gro_receive+0x27d/0x2f0 [ 53.192365][ T8921] receive_buf+0x24c/0x3420 [ 53.197034][ T8921] virtnet_poll+0x343/0x790 [ 53.201513][ T8921] net_rx_action+0x3ad/0xac0 [ 53.206088][ T8921] __do_softirq+0x118/0x34a [ 53.210673][ T8921] run_ksoftirqd+0x41/0x60 [ 53.215792][ T8921] smpboot_thread_fn+0x374/0x4a0 [ 53.221355][ T8921] kthread+0x203/0x230 [ 53.225491][ T8921] ret_from_fork+0x1f/0x30 [ 53.229980][ T8921] [ 53.232290][ T8921] read to 0xffff888129d72d10 of 8 bytes by task 8921 on cpu 0: [ 53.239848][ T8921] ep_poll+0x5ad/0x910 [ 53.243899][ T8921] do_epoll_wait+0x15a/0x180 [ 53.248748][ T8921] __x64_sys_epoll_pwait+0xc6/0x170 [ 53.254236][ T8921] do_syscall_64+0xc7/0x3b0 [ 53.259385][ T8921] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.265561][ T8921] [ 53.267876][ T8921] Reported by Kernel Concurrency Sanitizer on: [ 53.274684][ T8921] CPU: 0 PID: 8921 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 53.283088][ T8921] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.294100][ T8921] ================================================================== [ 53.302139][ T8921] Kernel panic - not syncing: panic_on_warn set ... [ 53.309236][ T8921] CPU: 0 PID: 8921 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 53.317452][ T8921] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.327599][ T8921] Call Trace: [ 53.330873][ T8921] dump_stack+0x11d/0x187 [ 53.335181][ T8921] panic+0x210/0x640 [ 53.339056][ T8921] ? vprintk_func+0x89/0x13a [ 53.343620][ T8921] kcsan_report.cold+0xc/0x1a [ 53.348289][ T8921] kcsan_setup_watchpoint+0x3fb/0x440 [ 53.358526][ T8921] ep_poll+0x5ad/0x910 [ 53.362665][ T8921] ? wake_up_q+0x90/0x90 [ 53.367236][ T8921] do_epoll_wait+0x15a/0x180 [ 53.372463][ T8921] __x64_sys_epoll_pwait+0xc6/0x170 [ 53.377657][ T8921] do_syscall_64+0xc7/0x3b0 [ 53.382146][ T8921] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.388460][ T8921] RIP: 0033:0x469240 [ 53.392700][ T8921] 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 [ 53.412563][ T8921] RSP: 002b:000000c0000897f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 53.422244][ T8921] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 0000000000469240 [ 53.430484][ T8921] RDX: 0000000000000080 RSI: 000000c000089840 RDI: 0000000000000003 [ 53.438684][ T8921] RBP: 000000c000089e40 R08: 0000000000000000 R09: 0000000000000000 [ 53.447242][ T8921] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000003 [ 53.455762][ T8921] R13: 000000c000001b00 R14: 0000000000000000 R15: 0000000000000000 [ 53.466005][ T8921] Kernel Offset: disabled [ 53.470420][ T8921] Rebooting in 86400 seconds..