[ 34.265657][ T23] audit: type=1800 audit(1571788002.103:25): pid=7033 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.292862][ T23] audit: type=1800 audit(1571788002.103:26): pid=7033 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.333476][ T23] audit: type=1800 audit(1571788002.103:27): pid=7033 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. [ 34.981704][ T7098] sshd (7098) 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 '10.128.10.49' (ECDSA) to the list of known hosts. 2019/10/22 23:46:54 fuzzer started 2019/10/22 23:46:55 dialing manager at 10.128.0.105:33369 2019/10/22 23:46:55 syscalls: 2524 2019/10/22 23:46:55 code coverage: enabled 2019/10/22 23:46:55 comparison tracing: enabled 2019/10/22 23:46:55 extra coverage: extra coverage is not supported by the kernel 2019/10/22 23:46:55 setuid sandbox: enabled 2019/10/22 23:46:55 namespace sandbox: enabled 2019/10/22 23:46:55 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 23:46:55 fault injection: enabled 2019/10/22 23:46:55 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 23:46:55 net packet injection: enabled 2019/10/22 23:46:55 net device setup: enabled 2019/10/22 23:46:55 concurrency sanitizer: enabled syzkaller login: [ 48.442659][ T7195] ================================================================== [ 48.450782][ T7195] BUG: KCSAN: data-race in __tcp_select_window / tcp_add_backlog [ 48.458619][ T7195] [ 48.460931][ T7195] write to 0xffff8881268012ec of 4 bytes by interrupt on cpu 1: [ 48.468542][ T7195] tcp_add_backlog+0x4a0/0xcc0 [ 48.473329][ T7195] tcp_v4_rcv+0x1a60/0x1bb0 [ 48.477809][ T7195] ip_protocol_deliver_rcu+0x4d/0x420 [ 48.483160][ T7195] ip_local_deliver_finish+0x110/0x140 [ 48.488641][ T7195] ip_local_deliver+0x133/0x210 [ 48.493466][ T7195] ip_rcv_finish+0x121/0x160 [ 48.498029][ T7195] ip_rcv+0x18f/0x1a0 [ 48.501991][ T7195] __netif_receive_skb_one_core+0xa7/0xe0 [ 48.507685][ T7195] __netif_receive_skb+0x37/0xf0 [ 48.513465][ T7195] netif_receive_skb_internal+0x59/0x190 [ 48.519333][ T7195] napi_gro_receive+0x28f/0x330 [ 48.524161][ T7195] receive_buf+0x284/0x30b0 [ 48.528642][ T7195] virtnet_poll+0x436/0x7d0 [ 48.533160][ T7195] net_rx_action+0x3ae/0xa90 [ 48.537718][ T7195] [ 48.540025][ T7195] read to 0xffff8881268012ec of 4 bytes by task 7195 on cpu 0: [ 48.547544][ T7195] __tcp_select_window+0x6b/0x4d0 [ 48.552545][ T7195] __tcp_transmit_skb+0x700/0x1d60 [ 48.558153][ T7195] __tcp_send_ack+0x246/0x300 [ 48.562854][ T7195] tcp_send_ack+0x34/0x40 [ 48.567159][ T7195] tcp_cleanup_rbuf+0x130/0x360 [ 48.571984][ T7195] tcp_recvmsg+0x633/0x1a30 [ 48.576586][ T7195] inet_recvmsg+0xbb/0x250 [ 48.580998][ T7195] sock_recvmsg+0x92/0xb0 [ 48.585306][ T7195] sock_read_iter+0x15f/0x1e0 [ 48.589972][ T7195] new_sync_read+0x389/0x4f0 [ 48.594535][ T7195] __vfs_read+0xb1/0xc0 [ 48.598672][ T7195] vfs_read+0x143/0x2c0 [ 48.602817][ T7195] ksys_read+0xd5/0x1b0 [ 48.606953][ T7195] [ 48.609254][ T7195] Reported by Kernel Concurrency Sanitizer on: [ 48.615990][ T7195] CPU: 0 PID: 7195 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.623515][ T7195] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.633545][ T7195] ================================================================== [ 48.641579][ T7195] Kernel panic - not syncing: panic_on_warn set ... [ 48.648144][ T7195] CPU: 0 PID: 7195 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.655568][ T7195] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.665599][ T7195] Call Trace: [ 48.668871][ T7195] dump_stack+0xf5/0x159 [ 48.673090][ T7195] panic+0x210/0x640 [ 48.676966][ T7195] ? sock_read_iter+0x15f/0x1e0 [ 48.681793][ T7195] ? vprintk_func+0x8d/0x140 [ 48.686391][ T7195] kcsan_report.cold+0xc/0x10 [ 48.691060][ T7195] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 48.696581][ T7195] __tsan_read4+0x2c/0x30 [ 48.700891][ T7195] __tcp_select_window+0x6b/0x4d0 [ 48.705896][ T7195] __tcp_transmit_skb+0x700/0x1d60 [ 48.711004][ T7195] __tcp_send_ack+0x246/0x300 [ 48.715661][ T7195] tcp_send_ack+0x34/0x40 [ 48.719978][ T7195] tcp_cleanup_rbuf+0x130/0x360 [ 48.724807][ T7195] tcp_recvmsg+0x633/0x1a30 [ 48.729383][ T7195] inet_recvmsg+0xbb/0x250 [ 48.733774][ T7195] ? __tsan_read8+0x2c/0x30 [ 48.738253][ T7195] ? inet_sendpage+0x100/0x100 [ 48.743005][ T7195] sock_recvmsg+0x92/0xb0 [ 48.747326][ T7195] sock_read_iter+0x15f/0x1e0 [ 48.751982][ T7195] new_sync_read+0x389/0x4f0 [ 48.756553][ T7195] __vfs_read+0xb1/0xc0 [ 48.760688][ T7195] vfs_read+0x143/0x2c0 [ 48.764820][ T7195] ksys_read+0xd5/0x1b0 [ 48.768954][ T7195] __x64_sys_read+0x4c/0x60 [ 48.773456][ T7195] do_syscall_64+0xcc/0x370 [ 48.777955][ T7195] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.783819][ T7195] RIP: 0033:0x47c530 [ 48.787693][ T7195] 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 [ 48.810221][ T7195] RSP: 002b:000000c42014b810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 48.818608][ T7195] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 48.826554][ T7195] RDX: 0000000000001000 RSI: 000000c420134000 RDI: 0000000000000003 [ 48.834505][ T7195] RBP: 000000c42014b868 R08: 0000000000000000 R09: 0000000000000000 [ 48.842471][ T7195] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000040 [ 48.851114][ T7195] R13: ffffffffffffffff R14: 0000000000000010 R15: ffffffffffffffff [ 48.860461][ T7195] Kernel Offset: disabled [ 48.864794][ T7195] Rebooting in 86400 seconds..