[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 36.309289][ T26] audit: type=1800 audit(1571157606.310:25): pid=7089 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 36.329093][ T26] audit: type=1800 audit(1571157606.310:26): pid=7089 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 36.350795][ T26] audit: type=1800 audit(1571157606.310:27): pid=7089 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[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts.
2019/10/15 16:40:16 fuzzer started
2019/10/15 16:40:17 dialing manager at 10.128.0.105:38903
2019/10/15 16:40:17 syscalls: 2523
2019/10/15 16:40:17 code coverage: enabled
2019/10/15 16:40:17 comparison tracing: enabled
2019/10/15 16:40:17 extra coverage: extra coverage is not supported by the kernel
2019/10/15 16:40:17 setuid sandbox: enabled
2019/10/15 16:40:17 namespace sandbox: enabled
2019/10/15 16:40:17 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/15 16:40:17 fault injection: enabled
2019/10/15 16:40:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/15 16:40:17 net packet injection: enabled
2019/10/15 16:40:17 net device setup: enabled
2019/10/15 16:40:17 concurrency sanitizer: enabled
syzkaller login: [ 48.478900][ C0] ==================================================================
[ 48.487193][ C0] BUG: KCSAN: data-race in __zone_watermark_ok / free_one_page
[ 48.494708][ C0]
[ 48.497032][ C0] write to 0xffff88812fffcf58 of 8 bytes by task 7242 on cpu 1:
[ 48.504641][ C0] free_one_page+0x214/0x840
[ 48.509260][ C0] __free_pages_ok+0x370/0x640
[ 48.514004][ C0] free_compound_page+0x3d/0x50
[ 48.518851][ C0] __put_compound_page+0x4e/0x70
[ 48.523781][ C0] __put_page+0x54/0xd0
[ 48.528020][ C0] skb_release_data+0x1ba/0x3a0
[ 48.532850][ C0] skb_release_all+0x44/0x60
[ 48.537422][ C0] __kfree_skb+0x1f/0x30
[ 48.541645][ C0] tcp_recvmsg+0xf59/0x1a30
[ 48.546143][ C0] inet_recvmsg+0xbb/0x250
[ 48.550538][ C0] sock_recvmsg+0x92/0xb0
[ 48.554852][ C0] sock_read_iter+0x15f/0x1e0
[ 48.559512][ C0] new_sync_read+0x389/0x4f0
[ 48.564081][ C0] __vfs_read+0xb1/0xc0
[ 48.568405][ C0]
[ 48.571002][ C0] read to 0xffff88812fffcf58 of 8 bytes by interrupt on cpu 0:
[ 48.578526][ C0] __zone_watermark_ok+0x106/0x240
[ 48.583617][ C0] get_page_from_freelist+0x629/0x2300
[ 48.589090][ C0] __alloc_pages_nodemask+0x255/0x4d0
[ 48.594439][ C0] page_frag_alloc+0x11e/0x2d0
[ 48.599267][ C0] __napi_alloc_skb+0x172/0x210
[ 48.604116][ C0] page_to_skb+0x8d/0x480
[ 48.608433][ C0] receive_buf+0x17c7/0x30b0
[ 48.613010][ C0] virtnet_poll+0x436/0x7d0
[ 48.617501][ C0] net_rx_action+0x3ae/0xa50
[ 48.622111][ C0] __do_softirq+0x115/0x33f
[ 48.626721][ C0] irq_exit+0xbb/0xe0
[ 48.630692][ C0] do_IRQ+0xdf/0x150
[ 48.634571][ C0] ret_from_intr+0x0/0x19
[ 48.638982][ C0]
[ 48.641503][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 48.647845][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[ 48.654585][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 48.664628][ C0] ==================================================================
[ 48.672682][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 48.679262][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0
[ 48.686015][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 48.696062][ C0] Call Trace:
[ 48.699333][ C0]
[ 48.702169][ C0] dump_stack+0xf5/0x159
[ 48.706395][ C0] panic+0x209/0x639
[ 48.710286][ C0] ? net_rx_action+0x3ae/0xa50
[ 48.716257][ C0] ? vprintk_func+0x8d/0x140
[ 48.720937][ C0] kcsan_report.cold+0xc/0x1b
[ 48.725597][ C0] __kcsan_setup_watchpoint+0x3ee/0x510
[ 48.731123][ C0] __tsan_read8+0x2c/0x30
[ 48.735454][ C0] __zone_watermark_ok+0x106/0x240
[ 48.740619][ C0] get_page_from_freelist+0x629/0x2300
[ 48.746084][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 48.751702][ C0] ? __tsan_read8+0x2c/0x30
[ 48.756197][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[ 48.762450][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 48.768081][ C0] __alloc_pages_nodemask+0x255/0x4d0
[ 48.773451][ C0] page_frag_alloc+0x11e/0x2d0
[ 48.778199][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 48.783813][ C0] __napi_alloc_skb+0x172/0x210
[ 48.788669][ C0] page_to_skb+0x8d/0x480
[ 48.793677][ C0] receive_buf+0x17c7/0x30b0
[ 48.798257][ C0] ? __tsan_write8+0x32/0x40
[ 48.803181][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0
[ 48.808619][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 48.814244][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 48.819872][ C0] virtnet_poll+0x436/0x7d0
[ 48.824398][ C0] net_rx_action+0x3ae/0xa50
[ 48.829001][ C0] __do_softirq+0x115/0x33f
[ 48.833502][ C0] irq_exit+0xbb/0xe0
[ 48.837462][ C0] do_IRQ+0xdf/0x150
[ 48.841336][ C0] common_interrupt+0xf/0xf
[ 48.845818][ C0]
[ 48.848753][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 48.854106][ C0] Code: 90 90 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d ac d2 4e 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 9c d2 4e 00 fb f4 90 55 48 89 e5 41 55 41 54 53 e8 a2 78 a7 fc e8 9d 54 b9 fd 0f
[ 48.873691][ C0] RSP: 0018:ffffffff85a03de0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda
[ 48.882081][ C0] RAX: b22d0e560419018e RBX: 0000000000000000 RCX: 0000000000000570
[ 48.890033][ C0] RDX: 00000000005f8cf0 RSI: 020c49ba5e353f7d RDI: ffffffff85a55a28
[ 48.897983][ C0] RBP: ffffffff85a03e18 R08: 0000000000000000 R09: 0000ffff85a55a2f
[ 48.905938][ C0] R10: 00000000aaaaaaab R11: ffffffff86042cc0 R12: ffffffff85a2b780
[ 48.913888][ C0] R13: ffffffff85a2b780 R14: 0000000000000000 R15: 0000000000000000
[ 48.921857][ C0] ? default_idle+0x50/0x230
[ 48.926433][ C0] arch_cpu_idle+0x1f/0x30
[ 48.930842][ C0] default_idle_call+0x1e/0x40
[ 48.935682][ C0] do_idle+0x1ea/0x2c0
[ 48.939830][ C0] ? do_idle+0xe6/0x2c0
[ 48.943988][ C0] cpu_startup_entry+0x1b/0x20
[ 48.948730][ C0] rest_init+0xec/0xf6
[ 48.952780][ C0] ? trace_event_define_fields_vector_free_moved+0xce/0xce
[ 48.959953][ C0] arch_call_rest_init+0x17/0x37
[ 48.964882][ C0] start_kernel+0x83e/0x864
[ 48.969381][ C0] x86_64_start_reservations+0x29/0x2b
[ 48.974836][ C0] x86_64_start_kernel+0x72/0x76
[ 48.979766][ C0] secondary_startup_64+0xa4/0xb0
[ 48.986251][ C0] Kernel Offset: disabled
[ 48.990591][ C0] Rebooting in 86400 seconds..