[ 44.274687][ T26] audit: type=1800 audit(1570879844.815:21): pid=7157 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 44.323089][ T26] audit: type=1800 audit(1570879844.815:22): pid=7157 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 44.353129][ T26] audit: type=1800 audit(1570879844.825:23): pid=7157 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 '10.128.0.134' (ECDSA) to the list of known hosts. 2019/10/12 11:30:55 fuzzer started 2019/10/12 11:30:56 dialing manager at 10.128.0.105:43913 2019/10/12 11:30:56 syscalls: 2523 2019/10/12 11:30:56 code coverage: enabled 2019/10/12 11:30:56 comparison tracing: enabled 2019/10/12 11:30:56 extra coverage: extra coverage is not supported by the kernel 2019/10/12 11:30:56 setuid sandbox: enabled 2019/10/12 11:30:56 namespace sandbox: enabled 2019/10/12 11:30:56 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 11:30:56 fault injection: enabled 2019/10/12 11:30:56 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 11:30:56 net packet injection: enabled 2019/10/12 11:30:56 net device setup: enabled 2019/10/12 11:30:56 concurrency sanitizer: enabled syzkaller login: [ 56.315172][ T7311] ================================================================== [ 56.323382][ T7311] BUG: KCSAN: data-race in __zone_watermark_ok / free_one_page [ 56.330920][ T7311] [ 56.333236][ T7311] read to 0xffff88812fffcf58 of 8 bytes by interrupt on cpu 1: [ 56.341198][ T7311] __zone_watermark_ok+0x106/0x240 [ 56.346318][ T7311] get_page_from_freelist+0x629/0x2300 [ 56.351871][ T7311] __alloc_pages_nodemask+0x255/0x4d0 [ 56.357237][ T7311] alloc_pages_current+0xd1/0x170 [ 56.362249][ T7311] skb_page_frag_refill+0x16f/0x260 [ 56.367431][ T7311] try_fill_recv+0x51f/0xdc0 [ 56.372005][ T7311] virtnet_poll+0x64c/0x7d0 [ 56.376494][ T7311] net_rx_action+0x3ae/0xa50 [ 56.381080][ T7311] __do_softirq+0x115/0x33f [ 56.385571][ T7311] irq_exit+0xbb/0xe0 [ 56.389540][ T7311] do_IRQ+0xdf/0x150 [ 56.393430][ T7311] ret_from_intr+0x0/0x19 [ 56.397746][ T7311] native_safe_halt+0xe/0x10 [ 56.402325][ T7311] arch_cpu_idle+0x1f/0x30 [ 56.406717][ T7311] [ 56.409034][ T7311] write to 0xffff88812fffcf58 of 8 bytes by task 7311 on cpu 0: [ 56.417090][ T7311] free_one_page+0x214/0x840 [ 56.421687][ T7311] __free_pages_ok+0x370/0x640 [ 56.426435][ T7311] free_compound_page+0x3d/0x50 [ 56.431268][ T7311] __put_compound_page+0x4e/0x70 [ 56.436190][ T7311] __put_page+0x54/0xd0 [ 56.440327][ T7311] skb_release_data+0x1ba/0x3a0 [ 56.445161][ T7311] skb_release_all+0x44/0x60 [ 56.449753][ T7311] __kfree_skb+0x1f/0x30 [ 56.453981][ T7311] tcp_recvmsg+0xf59/0x1a30 [ 56.458467][ T7311] inet_recvmsg+0xbb/0x250 [ 56.462865][ T7311] sock_recvmsg+0x92/0xb0 [ 56.467186][ T7311] sock_read_iter+0x15f/0x1e0 [ 56.471848][ T7311] new_sync_read+0x389/0x4f0 [ 56.476426][ T7311] [ 56.478735][ T7311] Reported by Kernel Concurrency Sanitizer on: [ 56.484875][ T7311] CPU: 0 PID: 7311 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 56.491962][ T7311] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.502000][ T7311] ================================================================== [ 56.510041][ T7311] Kernel panic - not syncing: panic_on_warn set ... [ 56.516612][ T7311] CPU: 0 PID: 7311 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 56.523695][ T7311] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.534252][ T7311] Call Trace: [ 56.537537][ T7311] dump_stack+0xf5/0x159 [ 56.541767][ T7311] panic+0x209/0x639 [ 56.545657][ T7311] ? tcp_recvmsg+0xf59/0x1a30 [ 56.550333][ T7311] ? vprintk_func+0x8d/0x140 [ 56.554921][ T7311] kcsan_report.cold+0xc/0x1b [ 56.559600][ T7311] __kcsan_setup_watchpoint+0x3ee/0x510 [ 56.565132][ T7311] __tsan_write8+0x32/0x40 [ 56.570105][ T7311] free_one_page+0x214/0x840 [ 56.574693][ T7311] __free_pages_ok+0x370/0x640 [ 56.579447][ T7311] free_compound_page+0x3d/0x50 [ 56.584287][ T7311] __put_compound_page+0x4e/0x70 [ 56.589210][ T7311] __put_page+0x54/0xd0 [ 56.593353][ T7311] skb_release_data+0x1ba/0x3a0 [ 56.598209][ T7311] skb_release_all+0x44/0x60 [ 56.602793][ T7311] __kfree_skb+0x1f/0x30 [ 56.607023][ T7311] tcp_recvmsg+0xf59/0x1a30 [ 56.611609][ T7311] inet_recvmsg+0xbb/0x250 [ 56.616009][ T7311] ? __tsan_read8+0x2c/0x30 [ 56.620499][ T7311] ? inet_sendpage+0x100/0x100 [ 56.625254][ T7311] sock_recvmsg+0x92/0xb0 [ 56.629577][ T7311] sock_read_iter+0x15f/0x1e0 [ 56.634254][ T7311] new_sync_read+0x389/0x4f0 [ 56.638843][ T7311] __vfs_read+0xb1/0xc0 [ 56.642986][ T7311] vfs_read+0x143/0x2c0 [ 56.647129][ T7311] ksys_read+0xd5/0x1b0 [ 56.651276][ T7311] __x64_sys_read+0x4c/0x60 [ 56.655776][ T7311] do_syscall_64+0xcf/0x2f0 [ 56.660276][ T7311] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.666274][ T7311] RIP: 0033:0x47c530 [ 56.670253][ T7311] 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 [ 56.689863][ T7311] RSP: 002b:000000c42033b810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 56.698260][ T7311] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 56.706229][ T7311] RDX: 0000000000001000 RSI: 000000c42015e000 RDI: 0000000000000003 [ 56.714186][ T7311] RBP: 000000c42033b868 R08: 0000000000000000 R09: 0000000000000000 [ 56.722142][ T7311] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000010 [ 56.730098][ T7311] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 57.868464][ T7311] Shutting down cpus with NMI [ 57.874488][ T7311] Kernel Offset: disabled [ 57.878812][ T7311] Rebooting in 86400 seconds..