[ 41.691281][ T26] audit: type=1800 audit(1571764593.386:25): 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 [ 41.736074][ T26] audit: type=1800 audit(1571764593.386:26): 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 [ 41.757174][ T26] audit: type=1800 audit(1571764593.386:27): 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. [ 42.404791][ T7126] sshd (7126) 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 '10.128.10.58' (ECDSA) to the list of known hosts. 2019/10/22 17:16:45 fuzzer started 2019/10/22 17:16:47 dialing manager at 10.128.0.105:33369 2019/10/22 17:16:47 syscalls: 2524 2019/10/22 17:16:47 code coverage: enabled 2019/10/22 17:16:47 comparison tracing: enabled 2019/10/22 17:16:47 extra coverage: extra coverage is not supported by the kernel 2019/10/22 17:16:47 setuid sandbox: enabled 2019/10/22 17:16:47 namespace sandbox: enabled 2019/10/22 17:16:47 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 17:16:47 fault injection: enabled 2019/10/22 17:16:47 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 17:16:47 net packet injection: enabled 2019/10/22 17:16:47 net device setup: enabled 2019/10/22 17:16:47 concurrency sanitizer: enabled syzkaller login: [ 55.712242][ T7213] ================================================================== [ 55.720375][ T7213] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 55.727391][ T7213] [ 55.729697][ T7213] write to 0xffff88811e46e138 of 8 bytes by interrupt on cpu 1: [ 55.737308][ T7213] tcp_add_backlog+0x45a/0xcc0 [ 55.742059][ T7213] tcp_v4_rcv+0x1a60/0x1bb0 [ 55.746537][ T7213] ip_protocol_deliver_rcu+0x4d/0x420 [ 55.751899][ T7213] ip_local_deliver_finish+0x110/0x140 [ 55.757356][ T7213] ip_local_deliver+0x133/0x210 [ 55.762273][ T7213] ip_rcv_finish+0x121/0x160 [ 55.766839][ T7213] ip_rcv+0x18f/0x1a0 [ 55.770798][ T7213] __netif_receive_skb_one_core+0xa7/0xe0 [ 55.776506][ T7213] __netif_receive_skb+0x37/0xf0 [ 55.781421][ T7213] netif_receive_skb_internal+0x59/0x190 [ 55.787026][ T7213] napi_gro_receive+0x28f/0x330 [ 55.791947][ T7213] receive_buf+0x284/0x30b0 [ 55.796435][ T7213] virtnet_poll+0x436/0x7d0 [ 55.800917][ T7213] net_rx_action+0x3ae/0xa90 [ 55.805477][ T7213] [ 55.807785][ T7213] read to 0xffff88811e46e138 of 8 bytes by task 7213 on cpu 0: [ 55.815311][ T7213] tcp_recvmsg+0x470/0x1a30 [ 55.819842][ T7213] inet_recvmsg+0xbb/0x250 [ 55.824243][ T7213] sock_recvmsg+0x92/0xb0 [ 55.828551][ T7213] sock_read_iter+0x15f/0x1e0 [ 55.833201][ T7213] new_sync_read+0x389/0x4f0 [ 55.837787][ T7213] __vfs_read+0xb1/0xc0 [ 55.841920][ T7213] vfs_read+0x143/0x2c0 [ 55.846053][ T7213] ksys_read+0xd5/0x1b0 [ 55.850184][ T7213] __x64_sys_read+0x4c/0x60 [ 55.854704][ T7213] do_syscall_64+0xcc/0x370 [ 55.859188][ T7213] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.865049][ T7213] [ 55.867396][ T7213] Reported by Kernel Concurrency Sanitizer on: [ 55.873527][ T7213] CPU: 0 PID: 7213 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 55.880973][ T7213] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.891012][ T7213] ================================================================== [ 55.899056][ T7213] Kernel panic - not syncing: panic_on_warn set ... [ 55.905618][ T7213] CPU: 0 PID: 7213 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 55.913398][ T7213] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.923425][ T7213] Call Trace: [ 55.926710][ T7213] dump_stack+0xf5/0x159 [ 55.930935][ T7213] panic+0x210/0x640 [ 55.934803][ T7213] ? __x64_sys_read+0x4c/0x60 [ 55.939457][ T7213] ? vprintk_func+0x8d/0x140 [ 55.944041][ T7213] kcsan_report.cold+0xc/0x10 [ 55.948696][ T7213] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 55.954225][ T7213] __tsan_read8+0x2c/0x30 [ 55.958543][ T7213] tcp_recvmsg+0x470/0x1a30 [ 55.963038][ T7213] inet_recvmsg+0xbb/0x250 [ 55.967428][ T7213] ? __tsan_read8+0x2c/0x30 [ 55.971908][ T7213] ? inet_sendpage+0x100/0x100 [ 55.976649][ T7213] sock_recvmsg+0x92/0xb0 [ 55.980964][ T7213] sock_read_iter+0x15f/0x1e0 [ 55.985619][ T7213] new_sync_read+0x389/0x4f0 [ 55.990190][ T7213] __vfs_read+0xb1/0xc0 [ 55.994319][ T7213] vfs_read+0x143/0x2c0 [ 55.998462][ T7213] ksys_read+0xd5/0x1b0 [ 56.002594][ T7213] __x64_sys_read+0x4c/0x60 [ 56.007076][ T7213] do_syscall_64+0xcc/0x370 [ 56.011557][ T7213] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.017425][ T7213] RIP: 0033:0x47c530 [ 56.021297][ T7213] 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 [ 56.040876][ T7213] RSP: 002b:000000c4203417d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 56.049259][ T7213] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 56.057207][ T7213] RDX: 0000000000001000 RSI: 000000c420182000 RDI: 0000000000000003 [ 56.065161][ T7213] RBP: 000000c420341830 R08: 0000000000000000 R09: 0000000000000000 [ 56.073109][ T7213] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 56.081055][ T7213] R13: ffffffffffffffff R14: 0000000000000020 R15: ffffffffffffffff [ 56.090205][ T7213] Kernel Offset: disabled [ 56.094531][ T7213] Rebooting in 86400 seconds..