[ 41.047921][ T25] audit: type=1800 audit(1571137552.290:21): pid=7188 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 41.095417][ T25] audit: type=1800 audit(1571137552.290:22): pid=7188 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 41.122636][ T25] audit: type=1800 audit(1571137552.290:23): pid=7188 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.115' (ECDSA) to the list of known hosts. 2019/10/15 11:06:03 fuzzer started 2019/10/15 11:06:05 dialing manager at 10.128.0.105:38903 2019/10/15 11:06:05 syscalls: 2523 2019/10/15 11:06:05 code coverage: enabled 2019/10/15 11:06:05 comparison tracing: enabled 2019/10/15 11:06:05 extra coverage: extra coverage is not supported by the kernel 2019/10/15 11:06:05 setuid sandbox: enabled 2019/10/15 11:06:05 namespace sandbox: enabled 2019/10/15 11:06:05 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 11:06:05 fault injection: enabled 2019/10/15 11:06:05 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 11:06:05 net packet injection: enabled 2019/10/15 11:06:05 net device setup: enabled 2019/10/15 11:06:05 concurrency sanitizer: enabled syzkaller login: [ 54.745180][ T7340] ================================================================== [ 54.753301][ T7340] BUG: KCSAN: data-race in __zone_watermark_ok / get_page_from_freelist [ 54.762218][ T7340] [ 54.764539][ T7340] read to 0xffff88812fffcf58 of 8 bytes by interrupt on cpu 0: [ 54.772070][ T7340] __zone_watermark_ok+0x106/0x240 [ 54.777202][ T7340] get_page_from_freelist+0x629/0x2300 [ 54.782648][ T7340] __alloc_pages_nodemask+0x255/0x4d0 [ 54.788005][ T7340] page_frag_alloc+0x11e/0x2d0 [ 54.792756][ T7340] __napi_alloc_skb+0x172/0x210 [ 54.797606][ T7340] page_to_skb+0x8d/0x480 [ 54.801921][ T7340] receive_buf+0x17c7/0x30b0 [ 54.806509][ T7340] virtnet_poll+0x436/0x7d0 [ 54.810996][ T7340] net_rx_action+0x3ae/0xa50 [ 54.815584][ T7340] __do_softirq+0x115/0x33f [ 54.820094][ T7340] irq_exit+0xbb/0xe0 [ 54.824059][ T7340] do_IRQ+0xdf/0x150 [ 54.827937][ T7340] ret_from_intr+0x0/0x19 [ 54.832251][ T7340] native_safe_halt+0xe/0x10 [ 54.836818][ T7340] [ 54.839135][ T7340] write to 0xffff88812fffcf58 of 8 bytes by task 7340 on cpu 1: [ 54.846749][ T7340] get_page_from_freelist+0x1217/0x2300 [ 54.852296][ T7340] __alloc_pages_nodemask+0x255/0x4d0 [ 54.857653][ T7340] alloc_pages_vma+0x15b/0x2b0 [ 54.862403][ T7340] __handle_mm_fault+0x17ac/0x2d00 [ 54.867500][ T7340] handle_mm_fault+0x21b/0x520 [ 54.872249][ T7340] __do_page_fault+0x3fb/0x9e0 [ 54.877013][ T7340] do_page_fault+0x54/0x233 [ 54.881498][ T7340] page_fault+0x34/0x40 [ 54.885631][ T7340] [ 54.887940][ T7340] Reported by Kernel Concurrency Sanitizer on: [ 54.894080][ T7340] CPU: 1 PID: 7340 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 54.901166][ T7340] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.911200][ T7340] ================================================================== [ 54.919244][ T7340] Kernel panic - not syncing: panic_on_warn set ... [ 54.925818][ T7340] CPU: 1 PID: 7340 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 54.932925][ T7340] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.942961][ T7340] Call Trace: [ 54.946242][ T7340] dump_stack+0xf5/0x159 [ 54.950496][ T7340] panic+0x209/0x639 [ 54.954402][ T7340] ? vprintk_func+0x8d/0x140 [ 54.958986][ T7340] kcsan_report.cold+0xc/0x1b [ 54.963657][ T7340] __kcsan_setup_watchpoint+0x3ee/0x510 [ 54.969210][ T7340] __tsan_write8+0x32/0x40 [ 54.973622][ T7340] get_page_from_freelist+0x1217/0x2300 [ 54.979181][ T7340] __alloc_pages_nodemask+0x255/0x4d0 [ 54.984559][ T7340] alloc_pages_vma+0x15b/0x2b0 [ 54.989313][ T7340] __handle_mm_fault+0x17ac/0x2d00 [ 54.994424][ T7340] handle_mm_fault+0x21b/0x520 [ 54.999183][ T7340] __do_page_fault+0x3fb/0x9e0 [ 55.003940][ T7340] do_page_fault+0x54/0x233 [ 55.008433][ T7340] ? prepare_exit_to_usermode+0x154/0x1a0 [ 55.014156][ T7340] page_fault+0x34/0x40 [ 55.018298][ T7340] RIP: 0033:0x45a2a3 [ 55.022183][ T7340] 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 [ 55.041768][ T7340] RSP: 002b:00007ffdd9070b38 EFLAGS: 00010202 [ 55.047815][ T7340] RAX: 0000000000000000 RBX: 000000000007e000 RCX: 00000000000e2000 [ 55.055770][ T7340] RDX: 0000000000000000 RSI: 0000000000000071 RDI: 000000c42083c000 [ 55.063725][ T7340] RBP: 00007ffdd9070b80 R08: 000000c000000000 R09: 000000000000045c [ 55.071678][ T7340] R10: 00007ffdd90709c8 R11: 00007ffdd90709c0 R12: 00000000000000b7 [ 55.079633][ T7340] R13: 00000000000000b6 R14: 0000000000000200 R15: ffffffffffffffff [ 56.211526][ T7340] Shutting down cpus with NMI [ 56.217500][ T7340] Kernel Offset: disabled [ 56.221826][ T7340] Rebooting in 86400 seconds..