[ 52.349305][ T26] audit: type=1800 audit(1572879390.116:30): pid=7902 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.126' (ECDSA) to the list of known hosts. 2019/11/04 14:56:40 fuzzer started 2019/11/04 14:56:41 dialing manager at 10.128.0.105:42499 2019/11/04 14:56:41 syscalls: 2553 2019/11/04 14:56:41 code coverage: enabled 2019/11/04 14:56:41 comparison tracing: enabled 2019/11/04 14:56:41 extra coverage: extra coverage is not supported by the kernel 2019/11/04 14:56:41 setuid sandbox: enabled 2019/11/04 14:56:41 namespace sandbox: enabled 2019/11/04 14:56:41 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/04 14:56:41 fault injection: enabled 2019/11/04 14:56:41 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/04 14:56:41 net packet injection: enabled 2019/11/04 14:56:41 net device setup: enabled 2019/11/04 14:56:41 concurrency sanitizer: enabled 2019/11/04 14:56:41 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/04 14:56:42 adding functions to KCSAN blacklist: 'find_next_bit' 'generic_permission' 'tomoyo_supervisor' '__hrtimer_run_queues' syzkaller login: [ 65.004561][ T8057] ================================================================== [ 65.012694][ T8057] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 65.019804][ T8057] [ 65.022131][ T8057] write to 0xffff8881265109f8 of 8 bytes by interrupt on cpu 1: [ 65.029759][ T8057] tcp_add_backlog+0x476/0xce0 [ 65.034519][ T8057] tcp_v4_rcv+0x1a70/0x1bd0 [ 65.039006][ T8057] ip_protocol_deliver_rcu+0x4d/0x420 [ 65.044360][ T8057] ip_local_deliver_finish+0x110/0x140 [ 65.049799][ T8057] ip_local_deliver+0x133/0x210 [ 65.054630][ T8057] ip_rcv_finish+0x121/0x160 [ 65.059207][ T8057] ip_rcv+0x18f/0x1a0 [ 65.063174][ T8057] __netif_receive_skb_one_core+0xa7/0xe0 [ 65.068877][ T8057] __netif_receive_skb+0x37/0xf0 [ 65.073799][ T8057] netif_receive_skb_internal+0x59/0x190 [ 65.079429][ T8057] napi_gro_receive+0x28f/0x330 [ 65.084278][ T8057] receive_buf+0x284/0x30b0 [ 65.088759][ T8057] virtnet_poll+0x436/0x7d0 [ 65.093241][ T8057] net_rx_action+0x3ae/0xa90 [ 65.097813][ T8057] __do_softirq+0x115/0x33f [ 65.102304][ T8057] irq_exit+0xbb/0xe0 [ 65.106268][ T8057] do_IRQ+0xa6/0x180 [ 65.110142][ T8057] ret_from_intr+0x0/0x19 [ 65.114462][ T8057] native_safe_halt+0xe/0x10 [ 65.119032][ T8057] arch_cpu_idle+0x1f/0x30 [ 65.123427][ T8057] default_idle_call+0x1e/0x40 [ 65.128172][ T8057] do_idle+0x1af/0x280 [ 65.132223][ T8057] cpu_startup_entry+0x1b/0x20 [ 65.136968][ T8057] start_secondary+0x208/0x260 [ 65.141721][ T8057] secondary_startup_64+0xa4/0xb0 [ 65.146724][ T8057] [ 65.149038][ T8057] read to 0xffff8881265109f8 of 8 bytes by task 8057 on cpu 0: [ 65.156559][ T8057] tcp_recvmsg+0x46e/0x1b40 [ 65.161042][ T8057] inet_recvmsg+0xbb/0x250 [ 65.165449][ T8057] sock_recvmsg+0x92/0xb0 [ 65.169764][ T8057] sock_read_iter+0x15f/0x1e0 [ 65.174422][ T8057] new_sync_read+0x389/0x4f0 [ 65.179003][ T8057] __vfs_read+0xb1/0xc0 [ 65.183138][ T8057] vfs_read+0x143/0x2c0 [ 65.187274][ T8057] ksys_read+0xd5/0x1b0 [ 65.191408][ T8057] __x64_sys_read+0x4c/0x60 [ 65.195895][ T8057] do_syscall_64+0xcc/0x370 [ 65.200379][ T8057] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.206245][ T8057] [ 65.208559][ T8057] Reported by Kernel Concurrency Sanitizer on: [ 65.214697][ T8057] CPU: 0 PID: 8057 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 65.222126][ T8057] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.232183][ T8057] ================================================================== [ 65.240222][ T8057] Kernel panic - not syncing: panic_on_warn set ... [ 65.248231][ T8057] CPU: 0 PID: 8057 Comm: syz-fuzzer Not tainted 5.4.0-rc6+ #0 [ 65.255681][ T8057] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.265722][ T8057] Call Trace: [ 65.269000][ T8057] dump_stack+0xf5/0x159 [ 65.273236][ T8057] panic+0x210/0x640 [ 65.277120][ T8057] ? vprintk_func+0x8d/0x140 [ 65.281693][ T8057] kcsan_report.cold+0xc/0xe [ 65.286266][ T8057] kcsan_setup_watchpoint+0x3fe/0x410 [ 65.291634][ T8057] __tsan_read8+0x145/0x1f0 [ 65.296210][ T8057] tcp_recvmsg+0x46e/0x1b40 [ 65.300706][ T8057] inet_recvmsg+0xbb/0x250 [ 65.305130][ T8057] ? apparmor_socket_recvmsg+0x3b/0x50 [ 65.310588][ T8057] ? security_socket_recvmsg+0x92/0xb0 [ 65.316039][ T8057] ? inet_sendpage+0x100/0x100 [ 65.320975][ T8057] sock_recvmsg+0x92/0xb0 [ 65.325299][ T8057] sock_read_iter+0x15f/0x1e0 [ 65.329962][ T8057] new_sync_read+0x389/0x4f0 [ 65.334540][ T8057] __vfs_read+0xb1/0xc0 [ 65.338680][ T8057] vfs_read+0x143/0x2c0 [ 65.342820][ T8057] ksys_read+0xd5/0x1b0 [ 65.346958][ T8057] __x64_sys_read+0x4c/0x60 [ 65.351448][ T8057] do_syscall_64+0xcc/0x370 [ 65.355937][ T8057] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 65.361808][ T8057] RIP: 0033:0x47c530 [ 65.365690][ T8057] 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 [ 65.385274][ T8057] RSP: 002b:000000c4202eb7d0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 65.393688][ T8057] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 65.401640][ T8057] RDX: 0000000000001000 RSI: 000000c4203f0000 RDI: 0000000000000003 [ 65.409595][ T8057] RBP: 000000c4202eb828 R08: 0000000000000000 R09: 0000000000000000 [ 65.417547][ T8057] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000010 [ 65.425500][ T8057] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 65.434763][ T8057] Kernel Offset: disabled [ 65.439090][ T8057] Rebooting in 86400 seconds..