[ 43.096693][ T26] audit: type=1800 audit(1571040042.024:21): pid=7273 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 43.145156][ T26] audit: type=1800 audit(1571040042.024:22): pid=7273 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 43.166710][ T26] audit: type=1800 audit(1571040042.024:23): pid=7273 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 '10.128.0.210' (ECDSA) to the list of known hosts. 2019/10/14 08:00:53 fuzzer started 2019/10/14 08:00:55 dialing manager at 10.128.0.105:40973 2019/10/14 08:00:55 syscalls: 2523 2019/10/14 08:00:55 code coverage: enabled 2019/10/14 08:00:55 comparison tracing: enabled 2019/10/14 08:00:55 extra coverage: extra coverage is not supported by the kernel 2019/10/14 08:00:55 setuid sandbox: enabled 2019/10/14 08:00:55 namespace sandbox: enabled 2019/10/14 08:00:55 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 08:00:55 fault injection: enabled 2019/10/14 08:00:55 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 08:00:55 net packet injection: enabled 2019/10/14 08:00:55 net device setup: enabled 2019/10/14 08:00:55 concurrency sanitizer: enabled syzkaller login: [ 56.317586][ T7427] ================================================================== [ 56.325744][ T7427] BUG: KCSAN: data-race in __zone_watermark_ok / free_one_page [ 56.333271][ T7427] [ 56.335592][ T7427] read to 0xffff88812fffcf58 of 8 bytes by interrupt on cpu 1: [ 56.343150][ T7427] __zone_watermark_ok+0x106/0x240 [ 56.348882][ T7427] get_page_from_freelist+0x629/0x2300 [ 56.354354][ T7427] __alloc_pages_nodemask+0x255/0x4d0 [ 56.359724][ T7427] alloc_pages_current+0xd1/0x170 [ 56.364756][ T7427] skb_page_frag_refill+0x16f/0x260 [ 56.369955][ T7427] try_fill_recv+0x51f/0xdc0 [ 56.374541][ T7427] virtnet_poll+0x64c/0x7d0 [ 56.379038][ T7427] net_rx_action+0x3ae/0xa50 [ 56.383711][ T7427] __do_softirq+0x115/0x33f [ 56.388208][ T7427] irq_exit+0xbb/0xe0 [ 56.392196][ T7427] do_IRQ+0xdf/0x150 [ 56.396168][ T7427] ret_from_intr+0x0/0x19 [ 56.400491][ T7427] native_safe_halt+0xe/0x10 [ 56.405075][ T7427] arch_cpu_idle+0x1f/0x30 [ 56.409472][ T7427] [ 56.411804][ T7427] write to 0xffff88812fffcf58 of 8 bytes by task 7427 on cpu 0: [ 56.419428][ T7427] free_one_page+0x783/0x840 [ 56.424019][ T7427] __free_pages_ok+0x370/0x640 [ 56.428863][ T7427] free_compound_page+0x3d/0x50 [ 56.433735][ T7427] __put_compound_page+0x4e/0x70 [ 56.438663][ T7427] __put_page+0x54/0xd0 [ 56.442810][ T7427] skb_release_data+0x1ba/0x3a0 [ 56.447659][ T7427] skb_release_all+0x44/0x60 [ 56.452241][ T7427] __kfree_skb+0x1f/0x30 [ 56.456476][ T7427] tcp_recvmsg+0xf59/0x1a30 [ 56.460975][ T7427] inet_recvmsg+0xbb/0x250 [ 56.465395][ T7427] sock_recvmsg+0x92/0xb0 [ 56.469774][ T7427] sock_read_iter+0x15f/0x1e0 [ 56.474528][ T7427] new_sync_read+0x389/0x4f0 [ 56.479098][ T7427] [ 56.481422][ T7427] Reported by Kernel Concurrency Sanitizer on: [ 56.487572][ T7427] CPU: 0 PID: 7427 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 56.494670][ T7427] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.505691][ T7427] ================================================================== [ 56.513748][ T7427] Kernel panic - not syncing: panic_on_warn set ... [ 56.520330][ T7427] CPU: 0 PID: 7427 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 56.527425][ T7427] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.537482][ T7427] Call Trace: [ 56.540786][ T7427] dump_stack+0xf5/0x159 [ 56.545042][ T7427] panic+0x209/0x639 [ 56.548950][ T7427] ? tcp_recvmsg+0xf59/0x1a30 [ 56.553621][ T7427] ? vprintk_func+0x8d/0x140 [ 56.558296][ T7427] kcsan_report.cold+0xc/0x1b [ 56.562984][ T7427] __kcsan_setup_watchpoint+0x3ee/0x510 [ 56.568534][ T7427] __tsan_write8+0x32/0x40 [ 56.572956][ T7427] free_one_page+0x783/0x840 [ 56.577553][ T7427] __free_pages_ok+0x370/0x640 [ 56.582413][ T7427] free_compound_page+0x3d/0x50 [ 56.587283][ T7427] __put_compound_page+0x4e/0x70 [ 56.592220][ T7427] __put_page+0x54/0xd0 [ 56.596393][ T7427] skb_release_data+0x1ba/0x3a0 [ 56.601265][ T7427] skb_release_all+0x44/0x60 [ 56.606115][ T7427] __kfree_skb+0x1f/0x30 [ 56.610356][ T7427] tcp_recvmsg+0xf59/0x1a30 [ 56.614887][ T7427] inet_recvmsg+0xbb/0x250 [ 56.619410][ T7427] ? __tsan_read8+0x2c/0x30 [ 56.623912][ T7427] ? inet_sendpage+0x100/0x100 [ 56.629018][ T7427] sock_recvmsg+0x92/0xb0 [ 56.633340][ T7427] sock_read_iter+0x15f/0x1e0 [ 56.638026][ T7427] new_sync_read+0x389/0x4f0 [ 56.642617][ T7427] __vfs_read+0xb1/0xc0 [ 56.646786][ T7427] vfs_read+0x143/0x2c0 [ 56.651040][ T7427] ksys_read+0xd5/0x1b0 [ 56.655196][ T7427] __x64_sys_read+0x4c/0x60 [ 56.659700][ T7427] do_syscall_64+0xcf/0x2f0 [ 56.664208][ T7427] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.670092][ T7427] RIP: 0033:0x47c530 [ 56.673996][ T7427] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 56.693601][ T7427] RSP: 002b:000000c4202ed810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 56.702012][ T7427] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 56.709994][ T7427] RDX: 0000000000001000 RSI: 000000c4203b6000 RDI: 0000000000000003 [ 56.717959][ T7427] RBP: 000000c4202ed868 R08: 0000000000000000 R09: 0000000000000000 [ 56.726058][ T7427] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000100 [ 56.734636][ T7427] R13: ffffffffffffffff R14: 0000000000000008 R15: ffffffffffffffff [ 57.880108][ T7427] Shutting down cpus with NMI [ 57.886618][ T7427] Kernel Offset: disabled [ 57.891111][ T7427] Rebooting in 86400 seconds..