[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.649885][ T25] audit: type=1800 audit(1570663924.492:25): pid=7042 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.679839][ T25] audit: type=1800 audit(1570663924.492:26): pid=7042 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.718171][ T25] audit: type=1800 audit(1570663924.492:27): pid=7042 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 '10.128.0.166' (ECDSA) to the list of known hosts. 2019/10/09 23:32:15 fuzzer started 2019/10/09 23:32:17 dialing manager at 10.128.0.105:43471 2019/10/09 23:32:17 syscalls: 2523 2019/10/09 23:32:17 code coverage: enabled 2019/10/09 23:32:17 comparison tracing: enabled 2019/10/09 23:32:17 extra coverage: extra coverage is not supported by the kernel 2019/10/09 23:32:17 setuid sandbox: enabled 2019/10/09 23:32:17 namespace sandbox: enabled 2019/10/09 23:32:17 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/09 23:32:17 fault injection: enabled 2019/10/09 23:32:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/09 23:32:17 net packet injection: enabled 2019/10/09 23:32:17 net device setup: enabled 2019/10/09 23:32:17 concurrency sanitizer: enabled syzkaller login: [ 47.697322][ T7195] ================================================================== [ 47.706019][ T7195] BUG: KCSAN: data-race in __zone_watermark_ok / get_page_from_freelist [ 47.714322][ T7195] [ 47.716638][ T7195] read to 0xffff88812fffcf58 of 8 bytes by interrupt on cpu 0: [ 47.724169][ T7195] __zone_watermark_ok+0x106/0x240 [ 47.729268][ T7195] get_page_from_freelist+0x629/0x2300 [ 47.734711][ T7195] __alloc_pages_nodemask+0x255/0x4d0 [ 47.740068][ T7195] alloc_pages_current+0xd1/0x170 [ 47.745080][ T7195] skb_page_frag_refill+0x16f/0x260 [ 47.750263][ T7195] try_fill_recv+0x51f/0xdc0 [ 47.754839][ T7195] virtnet_poll+0x64c/0x7d0 [ 47.759329][ T7195] net_rx_action+0x3ae/0xa50 [ 47.763903][ T7195] __do_softirq+0x115/0x33f [ 47.768392][ T7195] irq_exit+0xbb/0xe0 [ 47.772372][ T7195] do_IRQ+0xdf/0x150 [ 47.776247][ T7195] ret_from_intr+0x0/0x19 [ 47.780571][ T7195] native_safe_halt+0xe/0x10 [ 47.785155][ T7195] arch_cpu_idle+0x1f/0x30 [ 47.789546][ T7195] [ 47.791866][ T7195] write to 0xffff88812fffcf58 of 8 bytes by task 7195 on cpu 1: [ 47.799488][ T7195] get_page_from_freelist+0x131e/0x2300 [ 47.805555][ T7195] __alloc_pages_nodemask+0x255/0x4d0 [ 47.810908][ T7195] alloc_pages_vma+0x15b/0x2b0 [ 47.815658][ T7195] __handle_mm_fault+0x17ac/0x2d00 [ 47.820753][ T7195] handle_mm_fault+0x21b/0x520 [ 47.825502][ T7195] __do_page_fault+0x3fb/0x9e0 [ 47.830247][ T7195] do_page_fault+0x54/0x233 [ 47.834744][ T7195] page_fault+0x34/0x40 [ 47.838872][ T7195] [ 47.841181][ T7195] Reported by Kernel Concurrency Sanitizer on: [ 47.847318][ T7195] CPU: 1 PID: 7195 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.854411][ T7195] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.864456][ T7195] ================================================================== [ 47.872500][ T7195] Kernel panic - not syncing: panic_on_warn set ... [ 47.879084][ T7195] CPU: 1 PID: 7195 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.886171][ T7195] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.896208][ T7195] Call Trace: [ 47.899493][ T7195] dump_stack+0xf5/0x159 [ 47.903728][ T7195] panic+0x209/0x639 [ 47.907614][ T7195] ? vprintk_func+0x8d/0x140 [ 47.912192][ T7195] kcsan_report.cold+0xc/0x1b [ 47.916860][ T7195] __kcsan_setup_watchpoint+0x3ee/0x510 [ 47.922392][ T7195] __tsan_write8+0x32/0x40 [ 47.926796][ T7195] get_page_from_freelist+0x131e/0x2300 [ 47.932344][ T7195] __alloc_pages_nodemask+0x255/0x4d0 [ 47.937707][ T7195] alloc_pages_vma+0x15b/0x2b0 [ 47.942458][ T7195] __handle_mm_fault+0x17ac/0x2d00 [ 47.947566][ T7195] handle_mm_fault+0x21b/0x520 [ 47.952320][ T7195] __do_page_fault+0x3fb/0x9e0 [ 47.957073][ T7195] do_page_fault+0x54/0x233 [ 47.961561][ T7195] ? prepare_exit_to_usermode+0x154/0x1a0 [ 47.967275][ T7195] page_fault+0x34/0x40 [ 47.971419][ T7195] RIP: 0033:0x45a2a3 [ 47.975303][ T7195] Code: 00 48 81 eb 00 01 00 00 48 81 c7 00 01 00 00 48 81 fb 00 01 00 00 73 82 e9 07 ff ff ff c5 fd ef c0 48 81 fb 00 00 00 02 73 46 fe 7f 07 c5 fe 7f 47 20 c5 fe 7f 47 40 c5 fe 7f 47 60 48 81 eb [ 47.994985][ T7195] RSP: 002b:000000c42007ff08 EFLAGS: 00010202 [ 48.001035][ T7195] RAX: 0000000000000000 RBX: 0000000000029000 RCX: 00000000000c2000 [ 48.008990][ T7195] RDX: 0000000000000000 RSI: 0000000000000061 RDI: 000000c42088b000 [ 48.016944][ T7195] RBP: 000000c42007ff50 R08: 000000c000000000 R09: 0000000000000459 [ 48.024906][ T7195] R10: 000000c42007fd98 R11: 000000c42007fd90 R12: 000000000000010e [ 48.033042][ T7195] R13: 000000000000010d R14: 0000000000000200 R15: ffffffffffffffff [ 49.190528][ T7195] Shutting down cpus with NMI [ 49.196644][ T7195] Kernel Offset: disabled [ 49.200966][ T7195] Rebooting in 86400 seconds..