[ 34.272106][ T26] audit: type=1800 audit(1571701128.103:25): pid=7011 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.299180][ T26] audit: type=1800 audit(1571701128.103:26): pid=7011 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.337501][ T26] audit: type=1800 audit(1571701128.103:27): pid=7011 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 34.610460][ T7076] sshd (7076) used greatest stack depth: 10136 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.184' (ECDSA) to the list of known hosts. 2019/10/21 23:38:59 fuzzer started 2019/10/21 23:39:00 dialing manager at 10.128.0.105:39747 2019/10/21 23:39:00 syscalls: 2524 2019/10/21 23:39:00 code coverage: enabled 2019/10/21 23:39:00 comparison tracing: enabled 2019/10/21 23:39:00 extra coverage: extra coverage is not supported by the kernel 2019/10/21 23:39:00 setuid sandbox: enabled 2019/10/21 23:39:00 namespace sandbox: enabled 2019/10/21 23:39:00 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 23:39:00 fault injection: enabled 2019/10/21 23:39:00 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 23:39:00 net packet injection: enabled 2019/10/21 23:39:00 net device setup: enabled 2019/10/21 23:39:00 concurrency sanitizer: enabled syzkaller login: [ 46.875581][ T7166] ================================================================== [ 46.883726][ T7166] BUG: KCSAN: data-race in tcp_poll / tcp_queue_rcv [ 46.890301][ T7166] [ 46.892630][ T7166] write to 0xffff88812a62b778 of 4 bytes by interrupt on cpu 0: [ 46.900261][ T7166] tcp_queue_rcv+0x338/0x380 [ 46.904851][ T7166] tcp_rcv_established+0xbf1/0xf50 [ 46.909964][ T7166] tcp_v4_do_rcv+0x381/0x4e0 [ 46.914554][ T7166] tcp_v4_rcv+0x19dc/0x1bb0 [ 46.919057][ T7166] ip_protocol_deliver_rcu+0x4d/0x420 [ 46.924425][ T7166] ip_local_deliver_finish+0x110/0x140 [ 46.929882][ T7166] ip_local_deliver+0x133/0x210 [ 46.934728][ T7166] ip_rcv_finish+0x121/0x160 [ 46.939333][ T7166] ip_rcv+0x18f/0x1a0 [ 46.943310][ T7166] __netif_receive_skb_one_core+0xa7/0xe0 [ 46.949025][ T7166] __netif_receive_skb+0x37/0xf0 [ 46.953960][ T7166] netif_receive_skb_internal+0x59/0x190 [ 46.959577][ T7166] napi_gro_receive+0x28f/0x330 [ 46.964412][ T7166] receive_buf+0x284/0x30b0 [ 46.968891][ T7166] [ 46.971217][ T7166] read to 0xffff88812a62b778 of 4 bytes by task 7166 on cpu 1: [ 46.978752][ T7166] tcp_poll+0x204/0x6b0 [ 46.982888][ T7166] sock_poll+0xed/0x250 [ 46.987021][ T7166] ep_item_poll.isra.0+0x90/0x190 [ 46.992023][ T7166] ep_send_events_proc+0x113/0x590 [ 46.997109][ T7166] ep_scan_ready_list.constprop.0+0x189/0x500 [ 47.003150][ T7166] ep_poll+0xe3/0x900 [ 47.007116][ T7166] do_epoll_wait+0x162/0x180 [ 47.011715][ T7166] __x64_sys_epoll_pwait+0xcd/0x180 [ 47.016888][ T7166] do_syscall_64+0xcc/0x370 [ 47.021368][ T7166] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.027229][ T7166] [ 47.029528][ T7166] Reported by Kernel Concurrency Sanitizer on: [ 47.035655][ T7166] CPU: 1 PID: 7166 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 47.043081][ T7166] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.053109][ T7166] ================================================================== [ 47.061145][ T7166] Kernel panic - not syncing: panic_on_warn set ... [ 47.067708][ T7166] CPU: 1 PID: 7166 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 47.075152][ T7166] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.085187][ T7166] Call Trace: [ 47.088454][ T7166] dump_stack+0xf5/0x159 [ 47.092673][ T7166] panic+0x210/0x640 [ 47.096545][ T7166] ? do_syscall_64+0xcc/0x370 [ 47.101201][ T7166] ? vprintk_func+0x8d/0x140 [ 47.105769][ T7166] kcsan_report.cold+0xc/0x10 [ 47.110426][ T7166] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 47.115948][ T7166] __tsan_read4+0x2c/0x30 [ 47.120256][ T7166] tcp_poll+0x204/0x6b0 [ 47.124391][ T7166] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 47.129826][ T7166] sock_poll+0xed/0x250 [ 47.134227][ T7166] ? sock_read_iter+0x1e0/0x1e0 [ 47.139056][ T7166] ep_item_poll.isra.0+0x90/0x190 [ 47.144070][ T7166] ep_send_events_proc+0x113/0x590 [ 47.149158][ T7166] ? __schedule+0x319/0x640 [ 47.153638][ T7166] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 47.159252][ T7166] ep_scan_ready_list.constprop.0+0x189/0x500 [ 47.165294][ T7166] ? ep_loop_check_proc+0x2f0/0x2f0 [ 47.170470][ T7166] ep_poll+0xe3/0x900 [ 47.174443][ T7166] ? wake_up_q+0x70/0x70 [ 47.178665][ T7166] do_epoll_wait+0x162/0x180 [ 47.183233][ T7166] __x64_sys_epoll_pwait+0xcd/0x180 [ 47.188410][ T7166] do_syscall_64+0xcc/0x370 [ 47.192890][ T7166] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.198756][ T7166] RIP: 0033:0x45b300 [ 47.202629][ T7166] 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 [ 47.222218][ T7166] RSP: 002b:000000c420051860 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 47.230603][ T7166] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 000000000045b300 [ 47.238548][ T7166] RDX: 0000000000000080 RSI: 000000c4200518a0 RDI: 0000000000000004 [ 47.246493][ T7166] RBP: 000000c420051ea0 R08: 0000000000000000 R09: 000000c4201aa480 [ 47.254440][ T7166] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000001fa0 [ 47.262385][ T7166] R13: 00000000000000ff R14: 00007fe78f9706c8 R15: 0000000000000020 [ 47.271971][ T7166] Kernel Offset: disabled [ 47.276292][ T7166] Rebooting in 86400 seconds..