[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 38.711720][ T25] audit: type=1800 audit(1570245996.675:25): pid=6978 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 38.768758][ T25] audit: type=1800 audit(1570245996.685:26): pid=6978 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 38.790413][ T25] audit: type=1800 audit(1570245996.685:27): pid=6978 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. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.17' (ECDSA) to the list of known hosts. 2019/10/05 03:26:46 fuzzer started 2019/10/05 03:26:47 dialing manager at 10.128.0.105:35709 2019/10/05 03:26:47 syscalls: 2523 2019/10/05 03:26:47 code coverage: enabled 2019/10/05 03:26:47 comparison tracing: enabled 2019/10/05 03:26:47 extra coverage: extra coverage is not supported by the kernel 2019/10/05 03:26:47 setuid sandbox: enabled 2019/10/05 03:26:47 namespace sandbox: enabled 2019/10/05 03:26:47 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/05 03:26:47 fault injection: enabled 2019/10/05 03:26:47 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/05 03:26:47 net packet injection: enabled 2019/10/05 03:26:47 net device setup: enabled 2019/10/05 03:26:47 concurrency sanitizer: enabled syzkaller login: [ 50.153318][ T7131] ================================================================== [ 50.161514][ T7131] BUG: KCSAN: data-race in __zone_watermark_ok / get_page_from_freelist [ 50.169810][ T7131] [ 50.172132][ T7131] read to 0xffff88812fffcf58 of 8 bytes by interrupt on cpu 0: [ 50.179656][ T7131] __zone_watermark_ok+0x106/0x240 [ 50.184748][ T7131] get_page_from_freelist+0x629/0x2300 [ 50.190186][ T7131] __alloc_pages_nodemask+0x255/0x4d0 [ 50.195539][ T7131] alloc_pages_current+0xd1/0x170 [ 50.200552][ T7131] skb_page_frag_refill+0x16f/0x260 [ 50.205732][ T7131] try_fill_recv+0x51f/0xdc0 [ 50.210305][ T7131] virtnet_poll+0x64c/0x7d0 [ 50.214788][ T7131] net_rx_action+0x3ae/0xa50 [ 50.219359][ T7131] __do_softirq+0x115/0x33f [ 50.223841][ T7131] run_ksoftirqd+0x46/0x60 [ 50.228240][ T7131] smpboot_thread_fn+0x37d/0x4a0 [ 50.233159][ T7131] kthread+0x1d4/0x200 [ 50.237228][ T7131] ret_from_fork+0x1f/0x30 [ 50.241616][ T7131] [ 50.244031][ T7131] write to 0xffff88812fffcf58 of 8 bytes by task 7131 on cpu 1: [ 50.251647][ T7131] get_page_from_freelist+0x131e/0x2300 [ 50.257176][ T7131] __alloc_pages_nodemask+0x255/0x4d0 [ 50.262527][ T7131] alloc_pages_vma+0x15b/0x2b0 [ 50.267279][ T7131] __handle_mm_fault+0x17ac/0x2d00 [ 50.272370][ T7131] handle_mm_fault+0x21b/0x520 [ 50.277118][ T7131] __do_page_fault+0x3fb/0x9e0 [ 50.281865][ T7131] do_page_fault+0x54/0x233 [ 50.286350][ T7131] page_fault+0x34/0x40 [ 50.290475][ T7131] [ 50.292780][ T7131] Reported by Kernel Concurrency Sanitizer on: [ 50.298913][ T7131] CPU: 1 PID: 7131 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.305994][ T7131] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.316372][ T7131] ================================================================== [ 50.324412][ T7131] Kernel panic - not syncing: panic_on_warn set ... [ 50.330983][ T7131] CPU: 1 PID: 7131 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 50.338069][ T7131] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.348100][ T7131] Call Trace: [ 50.351382][ T7131] dump_stack+0xf5/0x159 [ 50.355609][ T7131] panic+0x209/0x639 [ 50.359503][ T7131] ? vprintk_func+0x8d/0x140 [ 50.364081][ T7131] kcsan_report.cold+0x57/0xeb [ 50.368829][ T7131] __kcsan_setup_watchpoint+0x342/0x500 [ 50.374362][ T7131] __tsan_write8+0x32/0x40 [ 50.378773][ T7131] get_page_from_freelist+0x131e/0x2300 [ 50.384317][ T7131] __alloc_pages_nodemask+0x255/0x4d0 [ 50.389696][ T7131] alloc_pages_vma+0x15b/0x2b0 [ 50.394476][ T7131] __handle_mm_fault+0x17ac/0x2d00 [ 50.399585][ T7131] handle_mm_fault+0x21b/0x520 [ 50.404346][ T7131] __do_page_fault+0x3fb/0x9e0 [ 50.409105][ T7131] do_page_fault+0x54/0x233 [ 50.413594][ T7131] ? do_syscall_64+0x273/0x2f0 [ 50.418345][ T7131] page_fault+0x34/0x40 [ 50.422484][ T7131] RIP: 0033:0x45a84a [ 50.426367][ T7131] Code: 0f 6f 59 e0 f3 44 0f 6f 61 f0 c5 fe 6f 26 4c 01 de 48 29 c3 c5 fe 6f 06 c5 fe 6f 4e 20 c5 fe 6f 56 40 c5 fe 6f 5e 60 48 01 c6 fd 7f 07 c5 fd 7f 4f 20 c5 fd 7f 57 40 c5 fd 7f 5f 60 48 01 c7 [ 50.445989][ T7131] RSP: 002b:000000c4204f1b58 EFLAGS: 00010202 [ 50.452128][ T7131] RAX: 0000000000000080 RBX: 000000000000797a RCX: 000000c4204c2000 [ 50.460090][ T7131] RDX: 00000000000243d7 RSI: 000000c4204ba686 RDI: 000000c4208e0000 [ 50.468043][ T7131] RBP: 000000c4204f1b88 R08: 000000c4204ba000 R09: 0000000000008000 [ 50.475995][ T7131] R10: 000000c4208df9fa R11: 0000000000000006 R12: 0000000000000200 [ 50.483947][ T7131] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 51.628048][ T7131] Shutting down cpus with NMI [ 51.633920][ T7131] Kernel Offset: disabled [ 51.638248][ T7131] Rebooting in 86400 seconds..