[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.195756][ T26] audit: type=1800 audit(1571074599.245:25): pid=7092 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.223993][ T26] audit: type=1800 audit(1571074599.245:26): pid=7092 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.246739][ T26] audit: type=1800 audit(1571074599.245:27): pid=7092 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 '10.128.15.226' (ECDSA) to the list of known hosts. 2019/10/14 17:36:46 fuzzer started 2019/10/14 17:36:47 dialing manager at 10.128.0.105:43961 2019/10/14 17:36:47 syscalls: 2523 2019/10/14 17:36:47 code coverage: enabled 2019/10/14 17:36:47 comparison tracing: enabled 2019/10/14 17:36:47 extra coverage: extra coverage is not supported by the kernel 2019/10/14 17:36:47 setuid sandbox: enabled 2019/10/14 17:36:47 namespace sandbox: enabled 2019/10/14 17:36:47 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 17:36:47 fault injection: enabled 2019/10/14 17:36:47 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 17:36:47 net packet injection: enabled 2019/10/14 17:36:47 net device setup: enabled 2019/10/14 17:36:47 concurrency sanitizer: enabled syzkaller login: [ 43.886252][ T7243] ================================================================== [ 43.894404][ T7243] BUG: KCSAN: data-race in __zone_watermark_ok / get_page_from_freelist [ 43.902794][ T7243] [ 43.905113][ T7243] read to 0xffff88812fffcf58 of 8 bytes by interrupt on cpu 0: [ 43.912647][ T7243] __zone_watermark_ok+0x106/0x240 [ 43.917746][ T7243] get_page_from_freelist+0x629/0x2300 [ 43.923206][ T7243] __alloc_pages_nodemask+0x255/0x4d0 [ 43.928565][ T7243] alloc_pages_current+0xd1/0x170 [ 43.933580][ T7243] skb_page_frag_refill+0x16f/0x260 [ 43.938773][ T7243] try_fill_recv+0x51f/0xdc0 [ 43.943363][ T7243] virtnet_poll+0x64c/0x7d0 [ 43.947850][ T7243] net_rx_action+0x3ae/0xa50 [ 43.952447][ T7243] __do_softirq+0x115/0x33f [ 43.956937][ T7243] run_ksoftirqd+0x46/0x60 [ 43.961352][ T7243] smpboot_thread_fn+0x37d/0x4a0 [ 43.966276][ T7243] kthread+0x1d4/0x200 [ 43.970332][ T7243] ret_from_fork+0x1f/0x30 [ 43.974725][ T7243] [ 43.977056][ T7243] write to 0xffff88812fffcf58 of 8 bytes by task 7243 on cpu 1: [ 43.984684][ T7243] get_page_from_freelist+0x1217/0x2300 [ 43.990215][ T7243] __alloc_pages_nodemask+0x255/0x4d0 [ 43.995571][ T7243] alloc_pages_vma+0x15b/0x2b0 [ 44.000317][ T7243] __handle_mm_fault+0x17ac/0x2d00 [ 44.005411][ T7243] handle_mm_fault+0x21b/0x520 [ 44.010184][ T7243] __do_page_fault+0x3fb/0x9e0 [ 44.015028][ T7243] do_page_fault+0x54/0x233 [ 44.019515][ T7243] page_fault+0x34/0x40 [ 44.023648][ T7243] [ 44.025959][ T7243] Reported by Kernel Concurrency Sanitizer on: [ 44.032098][ T7243] CPU: 1 PID: 7243 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 44.039196][ T7243] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.049333][ T7243] ================================================================== [ 44.057377][ T7243] Kernel panic - not syncing: panic_on_warn set ... [ 44.063949][ T7243] CPU: 1 PID: 7243 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 44.071036][ T7243] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.081072][ T7243] Call Trace: [ 44.084367][ T7243] dump_stack+0xf5/0x159 [ 44.088599][ T7243] panic+0x209/0x639 [ 44.092482][ T7243] ? vprintk_func+0x8d/0x140 [ 44.097064][ T7243] kcsan_report.cold+0xc/0x1b [ 44.101759][ T7243] __kcsan_setup_watchpoint+0x3ee/0x510 [ 44.107298][ T7243] __tsan_write8+0x32/0x40 [ 44.111707][ T7243] get_page_from_freelist+0x1217/0x2300 [ 44.117257][ T7243] __alloc_pages_nodemask+0x255/0x4d0 [ 44.122625][ T7243] alloc_pages_vma+0x15b/0x2b0 [ 44.127381][ T7243] __handle_mm_fault+0x17ac/0x2d00 [ 44.132489][ T7243] handle_mm_fault+0x21b/0x520 [ 44.137244][ T7243] __do_page_fault+0x3fb/0x9e0 [ 44.142007][ T7243] do_page_fault+0x54/0x233 [ 44.146615][ T7243] ? do_syscall_64+0x273/0x2f0 [ 44.151370][ T7243] page_fault+0x34/0x40 [ 44.155510][ T7243] RIP: 0033:0x45a858 [ 44.159419][ T7243] Code: 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 c5 fd 7f 07 c5 fd 7f 4f 20 c5 fd 7f 57 40 fd 7f 5f 60 48 01 c7 48 29 c3 77 cf 48 01 c3 48 01 fb c4 c1 7e [ 44.179014][ T7243] RSP: 002b:000000c420393b58 EFLAGS: 00010206 [ 44.185067][ T7243] RAX: 0000000000000080 RBX: 0000000000007660 RCX: 000000c4204d0000 [ 44.193980][ T7243] RDX: 000000000000be9a RSI: 000000c4204c89a0 RDI: 000000c420b85fa0 [ 44.201935][ T7243] RBP: 000000c420393b88 R08: 000000c4204c8000 R09: 0000000000008000 [ 44.209893][ T7243] R10: 000000c420b85680 R11: 0000000000000020 R12: 0000000000000080 [ 44.217853][ T7243] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 45.356887][ T7243] Shutting down cpus with NMI [ 45.363246][ T7243] Kernel Offset: disabled [ 45.367618][ T7243] Rebooting in 86400 seconds..