[ 36.471119][ T26] audit: type=1800 audit(1570192745.705:25): pid=7023 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.492065][ T26] audit: type=1800 audit(1570192745.705:26): pid=7023 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.492077][ T26] audit: type=1800 audit(1570192745.705:27): pid=7023 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. [ 36.925231][ T7086] sshd (7086) 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 '10.128.0.46' (ECDSA) to the list of known hosts. 2019/10/04 12:39:14 fuzzer started 2019/10/04 12:39:16 dialing manager at 10.128.0.105:38119 2019/10/04 12:39:16 syscalls: 2523 2019/10/04 12:39:16 code coverage: enabled 2019/10/04 12:39:16 comparison tracing: enabled 2019/10/04 12:39:16 extra coverage: extra coverage is not supported by the kernel 2019/10/04 12:39:16 setuid sandbox: enabled 2019/10/04 12:39:16 namespace sandbox: enabled 2019/10/04 12:39:16 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/04 12:39:16 fault injection: enabled 2019/10/04 12:39:16 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/04 12:39:16 net packet injection: enabled 2019/10/04 12:39:16 net device setup: enabled 2019/10/04 12:39:16 concurrency sanitizer: enabled syzkaller login: [ 47.626454][ T7177] ================================================================== [ 47.635150][ T7177] BUG: KCSAN: data-race in tcp_add_backlog+0x45a/0xcc0 and tcp_recvmsg+0x470/0x1a30 [ 47.645678][ T7177] [ 47.647987][ T7177] write to 0xffff888123460a38 of 8 bytes by interrupt on cpu 0: [ 47.655611][ T7177] tcp_add_backlog+0x45a/0xcc0 [ 47.660351][ T7177] tcp_v4_rcv+0x1aba/0x1bf0 [ 47.664906][ T7177] ip_protocol_deliver_rcu+0x51/0x470 [ 47.670259][ T7177] ip_local_deliver_finish+0x110/0x140 [ 47.675694][ T7177] ip_local_deliver+0x133/0x210 [ 47.680528][ T7177] ip_rcv_finish+0x121/0x160 [ 47.685095][ T7177] ip_rcv+0x18f/0x1a0 [ 47.689056][ T7177] __netif_receive_skb_one_core+0xa7/0xe0 [ 47.694753][ T7177] __netif_receive_skb+0x37/0xf0 [ 47.699664][ T7177] netif_receive_skb_internal+0x59/0x190 [ 47.705268][ T7177] napi_gro_receive+0x28f/0x330 [ 47.710094][ T7177] receive_buf+0x284/0x30b0 [ 47.714580][ T7177] virtnet_poll+0x436/0x7d0 [ 47.719058][ T7177] net_rx_action+0x3ae/0xa50 [ 47.723627][ T7177] [ 47.725935][ T7177] read to 0xffff888123460a38 of 8 bytes by task 7177 on cpu 1: [ 47.733459][ T7177] tcp_recvmsg+0x470/0x1a30 [ 47.737946][ T7177] inet_recvmsg+0xbb/0x250 [ 47.742352][ T7177] sock_recvmsg+0x92/0xb0 [ 47.746665][ T7177] sock_read_iter+0x15f/0x1e0 [ 47.751317][ T7177] new_sync_read+0x389/0x4f0 [ 47.755879][ T7177] __vfs_read+0xb1/0xc0 [ 47.760018][ T7177] vfs_read+0x143/0x2c0 [ 47.764148][ T7177] ksys_read+0xd5/0x1b0 [ 47.768285][ T7177] __x64_sys_read+0x4c/0x60 [ 47.772763][ T7177] do_syscall_64+0xcf/0x2f0 [ 47.777503][ T7177] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.783370][ T7177] [ 47.786813][ T7177] Reported by Kernel Concurrency Sanitizer on: [ 47.792956][ T7177] CPU: 1 PID: 7177 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.800037][ T7177] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.810073][ T7177] ================================================================== [ 47.818107][ T7177] Kernel panic - not syncing: panic_on_warn set ... [ 47.824676][ T7177] CPU: 1 PID: 7177 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.831753][ T7177] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.841783][ T7177] Call Trace: [ 47.845052][ T7177] dump_stack+0xf5/0x159 [ 47.849287][ T7177] panic+0x209/0x639 [ 47.853161][ T7177] ? vprintk_func+0x8d/0x140 [ 47.857736][ T7177] kcsan_report.cold+0x57/0xeb [ 47.862485][ T7177] __kcsan_setup_watchpoint+0x342/0x500 [ 47.868006][ T7177] __tsan_read8+0x2c/0x30 [ 47.872320][ T7177] tcp_recvmsg+0x470/0x1a30 [ 47.876809][ T7177] inet_recvmsg+0xbb/0x250 [ 47.881205][ T7177] ? __tsan_read8+0x2c/0x30 [ 47.885684][ T7177] ? inet_sendpage+0x100/0x100 [ 47.890424][ T7177] sock_recvmsg+0x92/0xb0 [ 47.894739][ T7177] sock_read_iter+0x15f/0x1e0 [ 47.899395][ T7177] new_sync_read+0x389/0x4f0 [ 47.904409][ T7177] __vfs_read+0xb1/0xc0 [ 47.908820][ T7177] vfs_read+0x143/0x2c0 [ 47.912951][ T7177] ksys_read+0xd5/0x1b0 [ 47.917086][ T7177] __x64_sys_read+0x4c/0x60 [ 47.921575][ T7177] do_syscall_64+0xcf/0x2f0 [ 47.926061][ T7177] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.936874][ T7177] RIP: 0033:0x47c530 [ 47.941181][ T7177] 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 [ 47.962197][ T7177] RSP: 002b:000000c4204db810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 47.970584][ T7177] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 47.978531][ T7177] RDX: 0000000000001000 RSI: 000000c420226000 RDI: 0000000000000003 [ 47.986477][ T7177] RBP: 000000c4204db868 R08: 0000000000000000 R09: 0000000000000000 [ 47.994423][ T7177] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004 [ 48.002381][ T7177] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 48.011610][ T7177] Kernel Offset: disabled [ 48.016454][ T7177] Rebooting in 86400 seconds..