[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.378287][ T25] audit: type=1800 audit(1570217565.203:25): pid=7130 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.413805][ T25] audit: type=1800 audit(1570217565.203:26): pid=7130 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.451519][ T25] audit: type=1800 audit(1570217565.213:27): pid=7130 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 '10.128.0.149' (ECDSA) to the list of known hosts. 2019/10/04 19:32:56 fuzzer started 2019/10/04 19:32:58 dialing manager at 10.128.0.105:44881 2019/10/04 19:32:58 syscalls: 2523 2019/10/04 19:32:58 code coverage: enabled 2019/10/04 19:32:58 comparison tracing: enabled 2019/10/04 19:32:58 extra coverage: extra coverage is not supported by the kernel 2019/10/04 19:32:58 setuid sandbox: enabled 2019/10/04 19:32:58 namespace sandbox: enabled 2019/10/04 19:32:58 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/04 19:32:58 fault injection: enabled 2019/10/04 19:32:58 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/04 19:32:58 net packet injection: enabled 2019/10/04 19:32:58 net device setup: enabled 2019/10/04 19:32:58 concurrency sanitizer: enabled syzkaller login: [ 49.310233][ T7289] ================================================================== [ 49.318429][ T7289] BUG: KCSAN: data-race in __zone_watermark_ok / get_page_from_freelist [ 49.326754][ T7289] [ 49.329175][ T7289] read to 0xffff88812fffcf58 of 8 bytes by interrupt on cpu 0: [ 49.336705][ T7289] __zone_watermark_ok+0x106/0x240 [ 49.341820][ T7289] get_page_from_freelist+0x629/0x2300 [ 49.347270][ T7289] __alloc_pages_nodemask+0x255/0x4d0 [ 49.352628][ T7289] page_frag_alloc+0x11e/0x2d0 [ 49.357384][ T7289] __napi_alloc_skb+0x172/0x210 [ 49.362222][ T7289] page_to_skb+0x8d/0x480 [ 49.366548][ T7289] receive_buf+0x17c7/0x30b0 [ 49.371125][ T7289] virtnet_poll+0x436/0x7d0 [ 49.375613][ T7289] net_rx_action+0x3ae/0xa50 [ 49.380717][ T7289] __do_softirq+0x115/0x33f [ 49.385282][ T7289] run_ksoftirqd+0x46/0x60 [ 49.389707][ T7289] smpboot_thread_fn+0x37d/0x4a0 [ 49.394811][ T7289] kthread+0x1d4/0x200 [ 49.398893][ T7289] ret_from_fork+0x1f/0x30 [ 49.403287][ T7289] [ 49.405616][ T7289] write to 0xffff88812fffcf58 of 8 bytes by task 7289 on cpu 1: [ 49.413246][ T7289] get_page_from_freelist+0x1217/0x2300 [ 49.418780][ T7289] __alloc_pages_nodemask+0x255/0x4d0 [ 49.424138][ T7289] alloc_pages_vma+0x15b/0x2b0 [ 49.428974][ T7289] __handle_mm_fault+0x17ac/0x2d00 [ 49.434067][ T7289] handle_mm_fault+0x21b/0x520 [ 49.438848][ T7289] __do_page_fault+0x3fb/0x9e0 [ 49.443614][ T7289] do_page_fault+0x54/0x233 [ 49.448106][ T7289] page_fault+0x34/0x40 [ 49.452240][ T7289] [ 49.454551][ T7289] Reported by Kernel Concurrency Sanitizer on: [ 49.460694][ T7289] CPU: 1 PID: 7289 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.467803][ T7289] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.477842][ T7289] ================================================================== [ 49.485890][ T7289] Kernel panic - not syncing: panic_on_warn set ... [ 49.492662][ T7289] CPU: 1 PID: 7289 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.499759][ T7289] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.509804][ T7289] Call Trace: [ 49.513089][ T7289] dump_stack+0xf5/0x159 [ 49.517325][ T7289] panic+0x209/0x639 [ 49.521210][ T7289] ? vprintk_func+0x8d/0x140 [ 49.525805][ T7289] kcsan_report.cold+0x57/0xeb [ 49.530557][ T7289] __kcsan_setup_watchpoint+0x342/0x500 [ 49.536167][ T7289] __tsan_write8+0x32/0x40 [ 49.540572][ T7289] get_page_from_freelist+0x1217/0x2300 [ 49.546124][ T7289] __alloc_pages_nodemask+0x255/0x4d0 [ 49.551502][ T7289] alloc_pages_vma+0x15b/0x2b0 [ 49.556267][ T7289] __handle_mm_fault+0x17ac/0x2d00 [ 49.561375][ T7289] handle_mm_fault+0x21b/0x520 [ 49.566131][ T7289] __do_page_fault+0x3fb/0x9e0 [ 49.570888][ T7289] do_page_fault+0x54/0x233 [ 49.575387][ T7289] ? prepare_exit_to_usermode+0x154/0x1a0 [ 49.581119][ T7289] page_fault+0x34/0x40 [ 49.585266][ T7289] RIP: 0033:0x45a853 [ 49.589155][ T7289] Code: 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 c5 fd 7f 07 c5 fd 7f 4f 20 fd 7f 57 40 c5 fd 7f 5f 60 48 01 c7 48 29 c3 77 cf 48 01 c3 48 [ 49.608762][ T7289] RSP: 002b:000000c42034db58 EFLAGS: 00010202 [ 49.614812][ T7289] RAX: 0000000000000080 RBX: 0000000000004d63 RCX: 000000c420456000 [ 49.622771][ T7289] RDX: 00000000000ce488 RSI: 000000c42045129d RDI: 000000c420a45fc0 [ 49.630731][ T7289] RBP: 000000c42034db88 R08: 000000c42044e000 R09: 0000000000008000 [ 49.638690][ T7289] R10: 000000c420a42da3 R11: 000000000000001d R12: 0000000000000008 [ 49.646660][ T7289] R13: ffffffffffffffff R14: 0000000000000020 R15: ffffffffffffffff [ 50.789024][ T7289] Shutting down cpus with NMI [ 50.796087][ T7289] Kernel Offset: disabled [ 50.800410][ T7289] Rebooting in 86400 seconds..