[ 52.941975][ T26] audit: type=1800 audit(1571783370.591:27): pid=7174 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 52.963046][ T26] audit: type=1800 audit(1571783370.591:28): pid=7174 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 53.820482][ T26] audit: type=1800 audit(1571783371.511:29): pid=7174 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 [ 53.840497][ T26] audit: type=1800 audit(1571783371.511:30): pid=7174 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 '10.128.0.191' (ECDSA) to the list of known hosts. 2019/10/22 22:29:42 fuzzer started 2019/10/22 22:29:44 dialing manager at 10.128.0.105:33369 2019/10/22 22:29:44 syscalls: 2524 2019/10/22 22:29:44 code coverage: enabled 2019/10/22 22:29:44 comparison tracing: enabled 2019/10/22 22:29:44 extra coverage: extra coverage is not supported by the kernel 2019/10/22 22:29:44 setuid sandbox: enabled 2019/10/22 22:29:44 namespace sandbox: enabled 2019/10/22 22:29:44 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 22:29:44 fault injection: enabled 2019/10/22 22:29:44 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 22:29:44 net packet injection: enabled 2019/10/22 22:29:44 net device setup: enabled 2019/10/22 22:29:44 concurrency sanitizer: enabled syzkaller login: [ 67.648744][ T7345] ================================================================== [ 67.657069][ T7345] BUG: KCSAN: data-race in __tcp_select_window / tcp_add_backlog [ 67.665292][ T7345] [ 67.667636][ T7345] write to 0xffff88811d1fc12c of 4 bytes by interrupt on cpu 1: [ 67.676156][ T7345] tcp_add_backlog+0x4a0/0xcc0 [ 67.681259][ T7345] tcp_v4_rcv+0x1a60/0x1bb0 [ 67.685928][ T7345] ip_protocol_deliver_rcu+0x4d/0x420 [ 67.691299][ T7345] ip_local_deliver_finish+0x110/0x140 [ 67.697166][ T7345] ip_local_deliver+0x133/0x210 [ 67.702181][ T7345] ip_rcv_finish+0x121/0x160 [ 67.706932][ T7345] ip_rcv+0x18f/0x1a0 [ 67.711147][ T7345] __netif_receive_skb_one_core+0xa7/0xe0 [ 67.717372][ T7345] __netif_receive_skb+0x37/0xf0 [ 67.722472][ T7345] netif_receive_skb_internal+0x59/0x190 [ 67.728300][ T7345] napi_gro_receive+0x28f/0x330 [ 67.733276][ T7345] receive_buf+0x284/0x30b0 [ 67.738079][ T7345] virtnet_poll+0x436/0x7d0 [ 67.742865][ T7345] net_rx_action+0x3ae/0xa90 [ 67.747644][ T7345] [ 67.749966][ T7345] read to 0xffff88811d1fc12c of 4 bytes by task 7345 on cpu 0: [ 67.757659][ T7345] __tcp_select_window+0x6b/0x4d0 [ 67.763097][ T7345] __tcp_transmit_skb+0x700/0x1d60 [ 67.768200][ T7345] __tcp_send_ack+0x246/0x300 [ 67.772985][ T7345] tcp_send_ack+0x34/0x40 [ 67.777548][ T7345] tcp_cleanup_rbuf+0x130/0x360 [ 67.783087][ T7345] tcp_recvmsg+0x633/0x1a30 [ 67.787783][ T7345] inet_recvmsg+0xbb/0x250 [ 67.793388][ T7345] sock_recvmsg+0x92/0xb0 [ 67.797958][ T7345] sock_read_iter+0x15f/0x1e0 [ 67.803341][ T7345] new_sync_read+0x389/0x4f0 [ 67.808466][ T7345] __vfs_read+0xb1/0xc0 [ 67.812613][ T7345] vfs_read+0x143/0x2c0 [ 67.817167][ T7345] ksys_read+0xd5/0x1b0 [ 67.821641][ T7345] [ 67.824222][ T7345] Reported by Kernel Concurrency Sanitizer on: [ 67.830552][ T7345] CPU: 0 PID: 7345 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 67.838384][ T7345] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.849599][ T7345] ================================================================== [ 67.858126][ T7345] Kernel panic - not syncing: panic_on_warn set ... [ 67.864917][ T7345] CPU: 0 PID: 7345 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 67.872450][ T7345] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.883703][ T7345] Call Trace: [ 67.887474][ T7345] dump_stack+0xf5/0x159 [ 67.892072][ T7345] panic+0x210/0x640 [ 67.896260][ T7345] ? sock_read_iter+0x15f/0x1e0 [ 67.901248][ T7345] ? vprintk_func+0x8d/0x140 [ 67.906276][ T7345] kcsan_report.cold+0xc/0x10 [ 67.911205][ T7345] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 67.917500][ T7345] __tsan_read4+0x2c/0x30 [ 67.921985][ T7345] __tcp_select_window+0x6b/0x4d0 [ 67.926999][ T7345] __tcp_transmit_skb+0x700/0x1d60 [ 67.932491][ T7345] __tcp_send_ack+0x246/0x300 [ 67.937788][ T7345] tcp_send_ack+0x34/0x40 [ 67.942569][ T7345] tcp_cleanup_rbuf+0x130/0x360 [ 67.947524][ T7345] tcp_recvmsg+0x633/0x1a30 [ 67.952052][ T7345] inet_recvmsg+0xbb/0x250 [ 67.956677][ T7345] ? __tsan_read8+0x2c/0x30 [ 67.961870][ T7345] ? inet_sendpage+0x100/0x100 [ 67.966637][ T7345] sock_recvmsg+0x92/0xb0 [ 67.971488][ T7345] sock_read_iter+0x15f/0x1e0 [ 67.976429][ T7345] new_sync_read+0x389/0x4f0 [ 67.981199][ T7345] __vfs_read+0xb1/0xc0 [ 67.985541][ T7345] vfs_read+0x143/0x2c0 [ 67.989776][ T7345] ksys_read+0xd5/0x1b0 [ 67.994007][ T7345] __x64_sys_read+0x4c/0x60 [ 67.999612][ T7345] do_syscall_64+0xcc/0x370 [ 68.004478][ T7345] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 68.011236][ T7345] RIP: 0033:0x47c530 [ 68.015266][ T7345] 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 [ 68.036723][ T7345] RSP: 002b:000000c4204db7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 68.045425][ T7345] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 68.053784][ T7345] RDX: 0000000000001000 RSI: 000000c4203ae000 RDI: 0000000000000003 [ 68.061925][ T7345] RBP: 000000c4204db830 R08: 0000000000000000 R09: 0000000000000000 [ 68.070577][ T7345] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000040 [ 68.079827][ T7345] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 68.090062][ T7345] Kernel Offset: disabled [ 68.094507][ T7345] Rebooting in 86400 seconds..