[ 34.390525][ T26] audit: type=1800 audit(1571729244.013:25): pid=7083 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.417842][ T26] audit: type=1800 audit(1571729244.013:26): pid=7083 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.438338][ T26] audit: type=1800 audit(1571729244.013:27): pid=7083 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. [ 34.937628][ T7148] sshd (7148) 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 '10.128.0.158' (ECDSA) to the list of known hosts. 2019/10/22 07:27:35 fuzzer started 2019/10/22 07:27:37 dialing manager at 10.128.0.105:37053 2019/10/22 07:27:37 syscalls: 2524 2019/10/22 07:27:37 code coverage: enabled 2019/10/22 07:27:37 comparison tracing: enabled 2019/10/22 07:27:37 extra coverage: extra coverage is not supported by the kernel 2019/10/22 07:27:37 setuid sandbox: enabled 2019/10/22 07:27:37 namespace sandbox: enabled 2019/10/22 07:27:37 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 07:27:37 fault injection: enabled 2019/10/22 07:27:37 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 07:27:37 net packet injection: enabled 2019/10/22 07:27:37 net device setup: enabled 2019/10/22 07:27:37 concurrency sanitizer: enabled syzkaller login: [ 47.753441][ T7237] ================================================================== [ 47.761691][ T7237] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 47.768093][ T7237] [ 47.770420][ T7237] read to 0xffff88812682f77c of 4 bytes by task 7234 on cpu 0: [ 47.777956][ T7237] tcp_poll+0x1cc/0x6b0 [ 47.782107][ T7237] sock_poll+0xed/0x250 [ 47.786252][ T7237] ep_item_poll.isra.0+0x90/0x190 [ 47.791262][ T7237] ep_send_events_proc+0x113/0x590 [ 47.796453][ T7237] ep_scan_ready_list.constprop.0+0x189/0x500 [ 47.802502][ T7237] ep_poll+0xe3/0x900 [ 47.806479][ T7237] do_epoll_wait+0x162/0x180 [ 47.811061][ T7237] __x64_sys_epoll_pwait+0xcd/0x180 [ 47.816257][ T7237] do_syscall_64+0xcc/0x370 [ 47.820758][ T7237] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.826633][ T7237] [ 47.828963][ T7237] write to 0xffff88812682f77c of 4 bytes by task 7237 on cpu 1: [ 47.836578][ T7237] tcp_recvmsg+0xd86/0x1a30 [ 47.841074][ T7237] inet_recvmsg+0xbb/0x250 [ 47.845474][ T7237] sock_recvmsg+0x92/0xb0 [ 47.849792][ T7237] sock_read_iter+0x15f/0x1e0 [ 47.854462][ T7237] new_sync_read+0x389/0x4f0 [ 47.859056][ T7237] __vfs_read+0xb1/0xc0 [ 47.863200][ T7237] vfs_read+0x143/0x2c0 [ 47.867347][ T7237] ksys_read+0xd5/0x1b0 [ 47.871495][ T7237] __x64_sys_read+0x4c/0x60 [ 47.875991][ T7237] do_syscall_64+0xcc/0x370 [ 47.880477][ T7237] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.886358][ T7237] [ 47.888666][ T7237] Reported by Kernel Concurrency Sanitizer on: [ 47.894823][ T7237] CPU: 1 PID: 7237 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 47.902266][ T7237] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.912370][ T7237] ================================================================== [ 47.920420][ T7237] Kernel panic - not syncing: panic_on_warn set ... [ 47.927098][ T7237] CPU: 1 PID: 7237 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 47.934632][ T7237] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.944679][ T7237] Call Trace: [ 47.947966][ T7237] dump_stack+0xf5/0x159 [ 47.952689][ T7237] panic+0x210/0x640 [ 47.956622][ T7237] ? __x64_sys_read+0x4c/0x60 [ 47.961302][ T7237] ? vprintk_func+0x8d/0x140 [ 47.965889][ T7237] kcsan_report.cold+0xc/0x10 [ 47.970558][ T7237] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 47.976109][ T7237] __tsan_write4+0x32/0x40 [ 47.980528][ T7237] tcp_recvmsg+0xd86/0x1a30 [ 47.985031][ T7237] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 47.990659][ T7237] inet_recvmsg+0xbb/0x250 [ 47.995063][ T7237] ? __tsan_read8+0x2c/0x30 [ 47.999559][ T7237] ? inet_sendpage+0x100/0x100 [ 48.004312][ T7237] sock_recvmsg+0x92/0xb0 [ 48.008629][ T7237] sock_read_iter+0x15f/0x1e0 [ 48.013308][ T7237] new_sync_read+0x389/0x4f0 [ 48.017899][ T7237] __vfs_read+0xb1/0xc0 [ 48.022047][ T7237] vfs_read+0x143/0x2c0 [ 48.026200][ T7237] ksys_read+0xd5/0x1b0 [ 48.030340][ T7237] __x64_sys_read+0x4c/0x60 [ 48.034844][ T7237] do_syscall_64+0xcc/0x370 [ 48.039342][ T7237] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.045222][ T7237] RIP: 0033:0x47c530 [ 48.049114][ T7237] 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 [ 48.068699][ T7237] RSP: 002b:000000c420310810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 48.077111][ T7237] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 48.085080][ T7237] RDX: 0000000000001000 RSI: 000000c420148000 RDI: 0000000000000003 [ 48.093045][ T7237] RBP: 000000c420310868 R08: 0000000000000000 R09: 0000000000000000 [ 48.101014][ T7237] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000001585fb [ 48.109127][ T7237] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 48.118290][ T7237] Kernel Offset: disabled [ 48.122628][ T7237] Rebooting in 86400 seconds..