[ 36.780996][ T26] audit: type=1800 audit(1570191839.646:25): pid=7059 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.829113][ T26] audit: type=1800 audit(1570191839.646:26): pid=7059 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.850553][ T26] audit: type=1800 audit(1570191839.646:27): pid=7059 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. [ 37.211708][ T7124] sshd (7124) used greatest stack depth: 10032 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.0' (ECDSA) to the list of known hosts. 2019/10/04 12:24:10 fuzzer started 2019/10/04 12:24:12 dialing manager at 10.128.0.105:38119 2019/10/04 12:24:12 syscalls: 2523 2019/10/04 12:24:12 code coverage: enabled 2019/10/04 12:24:12 comparison tracing: enabled 2019/10/04 12:24:12 extra coverage: extra coverage is not supported by the kernel 2019/10/04 12:24:12 setuid sandbox: enabled 2019/10/04 12:24:12 namespace sandbox: enabled 2019/10/04 12:24:12 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/04 12:24:12 fault injection: enabled 2019/10/04 12:24:12 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/04 12:24:12 net packet injection: enabled 2019/10/04 12:24:12 net device setup: enabled 2019/10/04 12:24:12 concurrency sanitizer: enabled syzkaller login: [ 49.392304][ T7216] ================================================================== [ 49.400493][ T7216] BUG: KCSAN: data-race in tcp_add_backlog+0x45a/0xcc0 and tcp_recvmsg+0x470/0x1a30 [ 49.410470][ T7216] [ 49.412803][ T7216] write to 0xffff8881255372f8 of 8 bytes by interrupt on cpu 1: [ 49.420412][ T7216] tcp_add_backlog+0x45a/0xcc0 [ 49.425153][ T7216] tcp_v4_rcv+0x1aba/0x1bf0 [ 49.429648][ T7216] ip_protocol_deliver_rcu+0x51/0x470 [ 49.435003][ T7216] ip_local_deliver_finish+0x110/0x140 [ 49.440440][ T7216] ip_local_deliver+0x133/0x210 [ 49.445280][ T7216] ip_rcv_finish+0x121/0x160 [ 49.449844][ T7216] ip_rcv+0x18f/0x1a0 [ 49.453810][ T7216] __netif_receive_skb_one_core+0xa7/0xe0 [ 49.459505][ T7216] __netif_receive_skb+0x37/0xf0 [ 49.464425][ T7216] netif_receive_skb_internal+0x59/0x190 [ 49.470044][ T7216] napi_gro_receive+0x28f/0x330 [ 49.474881][ T7216] receive_buf+0x284/0x30b0 [ 49.479372][ T7216] virtnet_poll+0x436/0x7d0 [ 49.483943][ T7216] net_rx_action+0x3ae/0xa50 [ 49.488503][ T7216] [ 49.490816][ T7216] read to 0xffff8881255372f8 of 8 bytes by task 7216 on cpu 0: [ 49.498342][ T7216] tcp_recvmsg+0x470/0x1a30 [ 49.502823][ T7216] inet_recvmsg+0xbb/0x250 [ 49.507216][ T7216] sock_recvmsg+0x92/0xb0 [ 49.511537][ T7216] sock_read_iter+0x15f/0x1e0 [ 49.516192][ T7216] new_sync_read+0x389/0x4f0 [ 49.520803][ T7216] __vfs_read+0xb1/0xc0 [ 49.524955][ T7216] vfs_read+0x143/0x2c0 [ 49.529086][ T7216] ksys_read+0xd5/0x1b0 [ 49.533219][ T7216] __x64_sys_read+0x4c/0x60 [ 49.537710][ T7216] do_syscall_64+0xcf/0x2f0 [ 49.542194][ T7216] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.548077][ T7216] [ 49.550380][ T7216] Reported by Kernel Concurrency Sanitizer on: [ 49.556526][ T7216] CPU: 0 PID: 7216 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.563605][ T7216] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.573636][ T7216] ================================================================== [ 49.581677][ T7216] Kernel panic - not syncing: panic_on_warn set ... [ 49.588245][ T7216] CPU: 0 PID: 7216 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.596109][ T7216] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.606153][ T7216] Call Trace: [ 49.609426][ T7216] dump_stack+0xf5/0x159 [ 49.613657][ T7216] panic+0x209/0x639 [ 49.617541][ T7216] ? vprintk_func+0x8d/0x140 [ 49.622117][ T7216] kcsan_report.cold+0x57/0xeb [ 49.626861][ T7216] __kcsan_setup_watchpoint+0x342/0x500 [ 49.632387][ T7216] __tsan_read8+0x2c/0x30 [ 49.636703][ T7216] tcp_recvmsg+0x470/0x1a30 [ 49.641890][ T7216] inet_recvmsg+0xbb/0x250 [ 49.646285][ T7216] ? __tsan_read8+0x2c/0x30 [ 49.650766][ T7216] ? inet_sendpage+0x100/0x100 [ 49.655510][ T7216] sock_recvmsg+0x92/0xb0 [ 49.659818][ T7216] sock_read_iter+0x15f/0x1e0 [ 49.664479][ T7216] new_sync_read+0x389/0x4f0 [ 49.669516][ T7216] __vfs_read+0xb1/0xc0 [ 49.673667][ T7216] vfs_read+0x143/0x2c0 [ 49.677806][ T7216] ksys_read+0xd5/0x1b0 [ 49.681944][ T7216] __x64_sys_read+0x4c/0x60 [ 49.686581][ T7216] do_syscall_64+0xcf/0x2f0 [ 49.691076][ T7216] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.696951][ T7216] RIP: 0033:0x47c530 [ 49.700848][ T7216] 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 [ 49.720464][ T7216] RSP: 002b:000000c4203a77d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 49.728852][ T7216] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 49.736809][ T7216] RDX: 0000000000001000 RSI: 000000c4203c6000 RDI: 0000000000000003 [ 49.744789][ T7216] RBP: 000000c4203a7830 R08: 0000000000000000 R09: 0000000000000000 [ 49.752735][ T7216] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000040 [ 49.760699][ T7216] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 49.770333][ T7216] Kernel Offset: disabled [ 49.774679][ T7216] Rebooting in 86400 seconds..