[info] Using makefile-style concurrent boot in runlevel 2. [ 43.939651][ T26] audit: type=1800 audit(1571162257.796:21): pid=7121 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 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 '10.128.0.35' (ECDSA) to the list of known hosts. 2019/10/15 17:57:49 fuzzer started 2019/10/15 17:57:50 dialing manager at 10.128.0.105:38903 2019/10/15 17:57:50 syscalls: 2523 2019/10/15 17:57:50 code coverage: enabled 2019/10/15 17:57:50 comparison tracing: enabled 2019/10/15 17:57:50 extra coverage: extra coverage is not supported by the kernel 2019/10/15 17:57:50 setuid sandbox: enabled 2019/10/15 17:57:50 namespace sandbox: enabled 2019/10/15 17:57:50 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 17:57:50 fault injection: enabled 2019/10/15 17:57:50 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 17:57:50 net packet injection: enabled 2019/10/15 17:57:50 net device setup: enabled 2019/10/15 17:57:50 concurrency sanitizer: enabled syzkaller login: [ 57.600835][ T7275] ================================================================== [ 57.608960][ T7275] BUG: KCSAN: data-race in __zone_watermark_ok / free_one_page [ 57.616474][ T7275] [ 57.618787][ T7275] read to 0xffff88812fffcf58 of 8 bytes by interrupt on cpu 1: [ 57.626314][ T7275] __zone_watermark_ok+0x106/0x240 [ 57.631407][ T7275] get_page_from_freelist+0x629/0x2300 [ 57.636846][ T7275] __alloc_pages_nodemask+0x255/0x4d0 [ 57.642201][ T7275] alloc_pages_current+0xd1/0x170 [ 57.647212][ T7275] skb_page_frag_refill+0x16f/0x260 [ 57.652393][ T7275] try_fill_recv+0x51f/0xdc0 [ 57.656964][ T7275] virtnet_poll+0x64c/0x7d0 [ 57.661450][ T7275] net_rx_action+0x3ae/0xa50 [ 57.666020][ T7275] __do_softirq+0x115/0x33f [ 57.670502][ T7275] run_ksoftirqd+0x46/0x60 [ 57.674897][ T7275] smpboot_thread_fn+0x37d/0x4a0 [ 57.679816][ T7275] kthread+0x1d4/0x200 [ 57.683864][ T7275] ret_from_fork+0x1f/0x30 [ 57.688253][ T7275] [ 57.690578][ T7275] write to 0xffff88812fffcf58 of 8 bytes by task 7275 on cpu 0: [ 57.698205][ T7275] free_one_page+0x214/0x840 [ 57.702781][ T7275] __free_pages_ok+0x370/0x640 [ 57.707529][ T7275] free_compound_page+0x3d/0x50 [ 57.712362][ T7275] __put_compound_page+0x4e/0x70 [ 57.717278][ T7275] __put_page+0x54/0xd0 [ 57.721434][ T7275] skb_release_data+0x1ba/0x3a0 [ 57.726270][ T7275] skb_release_all+0x44/0x60 [ 57.730843][ T7275] __kfree_skb+0x1f/0x30 [ 57.735072][ T7275] tcp_recvmsg+0xf59/0x1a30 [ 57.739560][ T7275] inet_recvmsg+0xbb/0x250 [ 57.743963][ T7275] sock_recvmsg+0x92/0xb0 [ 57.748275][ T7275] sock_read_iter+0x15f/0x1e0 [ 57.752943][ T7275] new_sync_read+0x389/0x4f0 [ 57.757509][ T7275] [ 57.759816][ T7275] Reported by Kernel Concurrency Sanitizer on: [ 57.765970][ T7275] CPU: 0 PID: 7275 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 57.773058][ T7275] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.783095][ T7275] ================================================================== [ 57.791149][ T7275] Kernel panic - not syncing: panic_on_warn set ... [ 57.797726][ T7275] CPU: 0 PID: 7275 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 57.804815][ T7275] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.814853][ T7275] Call Trace: [ 57.818136][ T7275] dump_stack+0xf5/0x159 [ 57.822371][ T7275] panic+0x209/0x639 [ 57.826255][ T7275] ? tcp_recvmsg+0xf59/0x1a30 [ 57.830920][ T7275] ? vprintk_func+0x8d/0x140 [ 57.835503][ T7275] kcsan_report.cold+0xc/0x1b [ 57.840170][ T7275] __kcsan_setup_watchpoint+0x3ee/0x510 [ 57.845704][ T7275] __tsan_write8+0x32/0x40 [ 57.850130][ T7275] free_one_page+0x214/0x840 [ 57.854714][ T7275] __free_pages_ok+0x370/0x640 [ 57.859473][ T7275] free_compound_page+0x3d/0x50 [ 57.864321][ T7275] __put_compound_page+0x4e/0x70 [ 57.869247][ T7275] __put_page+0x54/0xd0 [ 57.873394][ T7275] skb_release_data+0x1ba/0x3a0 [ 57.878236][ T7275] skb_release_all+0x44/0x60 [ 57.882832][ T7275] __kfree_skb+0x1f/0x30 [ 57.887083][ T7275] tcp_recvmsg+0xf59/0x1a30 [ 57.891586][ T7275] inet_recvmsg+0xbb/0x250 [ 57.895990][ T7275] ? __tsan_read8+0x2c/0x30 [ 57.900512][ T7275] ? inet_sendpage+0x100/0x100 [ 57.905261][ T7275] sock_recvmsg+0x92/0xb0 [ 57.909593][ T7275] sock_read_iter+0x15f/0x1e0 [ 57.914295][ T7275] new_sync_read+0x389/0x4f0 [ 57.918891][ T7275] __vfs_read+0xb1/0xc0 [ 57.923070][ T7275] vfs_read+0x143/0x2c0 [ 57.927310][ T7275] ksys_read+0xd5/0x1b0 [ 57.931895][ T7275] __x64_sys_read+0x4c/0x60 [ 57.936495][ T7275] do_syscall_64+0xcf/0x2f0 [ 57.940989][ T7275] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.946868][ T7275] RIP: 0033:0x47c530 [ 57.950759][ T7275] 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 [ 57.970345][ T7275] RSP: 002b:000000c4203a17d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 57.978745][ T7275] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 57.986708][ T7275] RDX: 0000000000001000 RSI: 000000c4202ae000 RDI: 0000000000000003 [ 57.994663][ T7275] RBP: 000000c4203a1830 R08: 0000000000000000 R09: 0000000000000000 [ 58.002626][ T7275] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 58.010598][ T7275] R13: ffffffffffffffff R14: 0000000000000008 R15: ffffffffffffffff [ 59.145650][ T7275] Shutting down cpus with NMI [ 59.151761][ T7275] Kernel Offset: disabled [ 59.156349][ T7275] Rebooting in 86400 seconds..