[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.410123][ T23] audit: type=1800 audit(1570619662.266:25): pid=7115 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.438205][ T23] audit: type=1800 audit(1570619662.266:26): pid=7115 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.474643][ T23] audit: type=1800 audit(1570619662.266:27): pid=7115 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 '10.128.0.45' (ECDSA) to the list of known hosts. 2019/10/09 11:14:32 fuzzer started 2019/10/09 11:14:34 dialing manager at 10.128.0.105:43333 2019/10/09 11:14:34 syscalls: 2523 2019/10/09 11:14:34 code coverage: enabled 2019/10/09 11:14:34 comparison tracing: enabled 2019/10/09 11:14:34 extra coverage: extra coverage is not supported by the kernel 2019/10/09 11:14:34 setuid sandbox: enabled 2019/10/09 11:14:34 namespace sandbox: enabled 2019/10/09 11:14:34 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/09 11:14:34 fault injection: enabled 2019/10/09 11:14:34 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/09 11:14:34 net packet injection: enabled 2019/10/09 11:14:34 net device setup: enabled 2019/10/09 11:14:34 concurrency sanitizer: enabled syzkaller login: [ 48.062416][ T7284] ================================================================== [ 48.070566][ T7284] BUG: KCSAN: data-race in __zone_watermark_ok / get_page_from_freelist [ 48.078870][ T7284] [ 48.081187][ T7284] read to 0xffff88812fffcf58 of 8 bytes by interrupt on cpu 0: [ 48.088717][ T7284] __zone_watermark_ok+0x106/0x240 [ 48.093819][ T7284] get_page_from_freelist+0x629/0x2300 [ 48.099263][ T7284] __alloc_pages_nodemask+0x255/0x4d0 [ 48.104618][ T7284] alloc_pages_current+0xd1/0x170 [ 48.109650][ T7284] skb_page_frag_refill+0x16f/0x260 [ 48.114849][ T7284] try_fill_recv+0x51f/0xdc0 [ 48.119427][ T7284] virtnet_poll+0x64c/0x7d0 [ 48.123915][ T7284] net_rx_action+0x3ae/0xa50 [ 48.128494][ T7284] __do_softirq+0x115/0x33f [ 48.132982][ T7284] run_ksoftirqd+0x46/0x60 [ 48.137396][ T7284] smpboot_thread_fn+0x37d/0x4a0 [ 48.142335][ T7284] kthread+0x1d4/0x200 [ 48.146389][ T7284] ret_from_fork+0x1f/0x30 [ 48.150781][ T7284] [ 48.153108][ T7284] write to 0xffff88812fffcf58 of 8 bytes by task 7284 on cpu 1: [ 48.160756][ T7284] get_page_from_freelist+0x131e/0x2300 [ 48.166297][ T7284] __alloc_pages_nodemask+0x255/0x4d0 [ 48.171661][ T7284] alloc_pages_vma+0x15b/0x2b0 [ 48.176412][ T7284] __handle_mm_fault+0x17ac/0x2d00 [ 48.181507][ T7284] handle_mm_fault+0x21b/0x520 [ 48.186260][ T7284] __do_page_fault+0x3fb/0x9e0 [ 48.191268][ T7284] do_page_fault+0x54/0x233 [ 48.195755][ T7284] page_fault+0x34/0x40 [ 48.199887][ T7284] [ 48.202197][ T7284] Reported by Kernel Concurrency Sanitizer on: [ 48.208424][ T7284] CPU: 1 PID: 7284 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.215510][ T7284] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.225547][ T7284] ================================================================== [ 48.233591][ T7284] Kernel panic - not syncing: panic_on_warn set ... [ 48.240163][ T7284] CPU: 1 PID: 7284 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.247252][ T7284] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.257304][ T7284] Call Trace: [ 48.260595][ T7284] dump_stack+0xf5/0x159 [ 48.264831][ T7284] panic+0x209/0x639 [ 48.268719][ T7284] ? vprintk_func+0x8d/0x140 [ 48.273301][ T7284] kcsan_report.cold+0xc/0x1b [ 48.277985][ T7284] __kcsan_setup_watchpoint+0x3ee/0x510 [ 48.283525][ T7284] __tsan_write8+0x32/0x40 [ 48.287950][ T7284] get_page_from_freelist+0x131e/0x2300 [ 48.293509][ T7284] __alloc_pages_nodemask+0x255/0x4d0 [ 48.299576][ T7284] alloc_pages_vma+0x15b/0x2b0 [ 48.304332][ T7284] __handle_mm_fault+0x17ac/0x2d00 [ 48.309441][ T7284] handle_mm_fault+0x21b/0x520 [ 48.314201][ T7284] __do_page_fault+0x3fb/0x9e0 [ 48.318973][ T7284] do_page_fault+0x54/0x233 [ 48.323480][ T7284] ? prepare_exit_to_usermode+0x154/0x1a0 [ 48.329189][ T7284] page_fault+0x34/0x40 [ 48.333342][ T7284] RIP: 0033:0x45a2a3 [ 48.337231][ T7284] 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 [ 48.357433][ T7284] RSP: 002b:000000c420149f08 EFLAGS: 00010202 [ 48.363587][ T7284] RAX: 0000000000000000 RBX: 0000000000033000 RCX: 00000000000f8000 [ 48.371547][ T7284] RDX: 0000000000000000 RSI: 000000000000007c RDI: 000000c420bcd000 [ 48.379526][ T7284] RBP: 000000c420149f50 R08: 000000c000000000 R09: 00000000000005ff [ 48.387502][ T7284] R10: 000000000000000b R11: 0000000000000000 R12: 0000000000000173 [ 48.395461][ T7284] R13: 0000000000000172 R14: 0000000000000200 R15: ffffffffffffffff [ 49.536180][ T7284] Shutting down cpus with NMI [ 49.542217][ T7284] Kernel Offset: disabled [ 49.546594][ T7284] Rebooting in 86400 seconds..