[ 33.886718][ T26] audit: type=1800 audit(1571626403.351:25): pid=7000 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 33.906500][ T26] audit: type=1800 audit(1571626403.351:26): pid=7000 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 33.928290][ T26] audit: type=1800 audit(1571626403.351:27): pid=7000 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. [ 34.223361][ T7064] sshd (7064) 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 '10.128.0.21' (ECDSA) to the list of known hosts. 2019/10/21 02:53:33 fuzzer started 2019/10/21 02:53:34 dialing manager at 10.128.0.105:43535 2019/10/21 02:53:34 syscalls: 2524 2019/10/21 02:53:34 code coverage: enabled 2019/10/21 02:53:34 comparison tracing: enabled 2019/10/21 02:53:34 extra coverage: extra coverage is not supported by the kernel 2019/10/21 02:53:34 setuid sandbox: enabled 2019/10/21 02:53:34 namespace sandbox: enabled 2019/10/21 02:53:34 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 02:53:34 fault injection: enabled 2019/10/21 02:53:34 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 02:53:34 net packet injection: enabled 2019/10/21 02:53:34 net device setup: enabled 2019/10/21 02:53:34 concurrency sanitizer: enabled syzkaller login: [ 45.650544][ T7155] ================================================================== [ 45.658673][ T7155] BUG: KCSAN: data-race in tcp_poll / tcp_recvmsg [ 45.665067][ T7155] [ 45.667416][ T7155] read to 0xffff88812182e5fc of 4 bytes by task 7152 on cpu 0: [ 45.674940][ T7155] tcp_poll+0x1cc/0x6b0 [ 45.679135][ T7155] sock_poll+0xed/0x250 [ 45.683307][ T7155] ep_item_poll.isra.0+0x90/0x190 [ 45.688308][ T7155] ep_send_events_proc+0x113/0x590 [ 45.693436][ T7155] ep_scan_ready_list.constprop.0+0x189/0x500 [ 45.699476][ T7155] ep_poll+0xe3/0x900 [ 45.703782][ T7155] do_epoll_wait+0x162/0x180 [ 45.708347][ T7155] __x64_sys_epoll_pwait+0xcd/0x180 [ 45.713533][ T7155] do_syscall_64+0xcc/0x370 [ 45.718042][ T7155] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.723995][ T7155] [ 45.726308][ T7155] write to 0xffff88812182e5fc of 4 bytes by task 7155 on cpu 1: [ 45.733915][ T7155] tcp_recvmsg+0xd86/0x1a30 [ 45.738397][ T7155] inet_recvmsg+0xbb/0x250 [ 45.742797][ T7155] sock_recvmsg+0x92/0xb0 [ 45.747115][ T7155] sock_read_iter+0x15f/0x1e0 [ 45.751766][ T7155] new_sync_read+0x389/0x4f0 [ 45.756328][ T7155] __vfs_read+0xb1/0xc0 [ 45.760458][ T7155] vfs_read+0x143/0x2c0 [ 45.764599][ T7155] ksys_read+0xd5/0x1b0 [ 45.768731][ T7155] __x64_sys_read+0x4c/0x60 [ 45.773221][ T7155] do_syscall_64+0xcc/0x370 [ 45.777717][ T7155] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.783592][ T7155] [ 45.785893][ T7155] Reported by Kernel Concurrency Sanitizer on: [ 45.792026][ T7155] CPU: 1 PID: 7155 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.799636][ T7155] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.809672][ T7155] ================================================================== [ 45.817714][ T7155] Kernel panic - not syncing: panic_on_warn set ... [ 45.824333][ T7155] CPU: 1 PID: 7155 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.831763][ T7155] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.841800][ T7155] Call Trace: [ 45.845095][ T7155] dump_stack+0xf5/0x159 [ 45.849317][ T7155] panic+0x210/0x640 [ 45.853194][ T7155] ? __x64_sys_read+0x4c/0x60 [ 45.857854][ T7155] ? vprintk_func+0x8d/0x140 [ 45.862424][ T7155] kcsan_report.cold+0xc/0x10 [ 45.867101][ T7155] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 45.872632][ T7155] __tsan_write4+0x32/0x40 [ 45.877028][ T7155] tcp_recvmsg+0xd86/0x1a30 [ 45.881511][ T7155] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 45.887123][ T7155] inet_recvmsg+0xbb/0x250 [ 45.891526][ T7155] ? __tsan_read8+0x2c/0x30 [ 45.896026][ T7155] ? inet_sendpage+0x100/0x100 [ 45.900810][ T7155] sock_recvmsg+0x92/0xb0 [ 45.905132][ T7155] sock_read_iter+0x15f/0x1e0 [ 45.909806][ T7155] new_sync_read+0x389/0x4f0 [ 45.914381][ T7155] __vfs_read+0xb1/0xc0 [ 45.918514][ T7155] vfs_read+0x143/0x2c0 [ 45.922657][ T7155] ksys_read+0xd5/0x1b0 [ 45.926798][ T7155] __x64_sys_read+0x4c/0x60 [ 45.931291][ T7155] do_syscall_64+0xcc/0x370 [ 45.935776][ T7155] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.941644][ T7155] RIP: 0033:0x47c530 [ 45.945518][ T7155] 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 [ 45.965096][ T7155] RSP: 002b:000000c4202e77d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 45.973657][ T7155] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 45.981617][ T7155] RDX: 0000000000001000 RSI: 000000c4203d6000 RDI: 0000000000000003 [ 45.989563][ T7155] RBP: 000000c4202e7830 R08: 0000000000000000 R09: 0000000000000000 [ 45.997531][ T7155] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 46.005493][ T7155] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 46.014614][ T7155] Kernel Offset: disabled [ 46.018940][ T7155] Rebooting in 86400 seconds..