[....] Starting enhanced syslogd: rsyslogd[ 13.868990] audit: type=1400 audit(1520551644.090:4): avc: denied { syslog } for pid=3648 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 28.012454] kasan: CONFIG_KASAN_INLINE enabled [ 28.017069] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 28.024410] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.030611] Dumping ftrace buffer: [ 28.034119] (ftrace buffer empty) [ 28.037795] Modules linked in: [ 28.041078] CPU: 1 PID: 3805 Comm: syzkaller138032 Not tainted 4.9.86-g00db063 #52 [ 28.048753] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.058075] task: ffff8801d937c800 task.stack: ffff8801b1aa8000 [ 28.064095] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 28.072327] RSP: 0018:ffff8801b1aafa60 EFLAGS: 00010a07 [ 28.077748] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82668edb [ 28.084996] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 28.092240] RBP: ffff8801b1aafa70 R08: 0000000000000001 R09: 0000000000000001 [ 28.099480] R10: 0000000000000000 R11: ffff8801d937c800 R12: 0000000000000004 [ 28.106719] R13: 0000000000000020 R14: ffff8801d7a48000 R15: dffffc0000000000 [ 28.113960] FS: 0000000002120880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.122157] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.128008] CR2: 000000002012f000 CR3: 00000001c1d4a000 CR4: 0000000000160670 [ 28.135248] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.142487] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.149724] Stack: [ 28.151843] 0000000000000001 ffff8801d7a48158 ffff8801b1aafad0 ffffffff82668f01 [ 28.159804] ffff8801d7a48170 ffffed003af4902b ffffed003af4902e ffff8801d7a48168 [ 28.167771] dead4ead00000000 ffff8801d7a48140 0000000000000000 0000000000000000 [ 28.175726] Call Trace: [ 28.178286] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 28.184743] [] sg_finish_rem_req+0x2b5/0x340 [ 28.190766] [] sg_new_read.isra.20+0x356/0x3e0 [ 28.196962] [] ? sg_get_rq_mark+0xcc/0x190 [ 28.202819] [] sg_read+0x8b7/0x1440 [ 28.208062] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 28.214696] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 28.221768] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 28.228404] [] __vfs_read+0x103/0x670 [ 28.233820] [] ? default_llseek+0x290/0x290 [ 28.239757] [] ? fsnotify+0x86/0xf30 [ 28.245085] [] ? fsnotify+0xf30/0xf30 [ 28.250502] [] ? avc_policy_seqno+0x9/0x20 [ 28.256353] [] ? selinux_file_permission+0x82/0x460 [ 28.262987] [] ? security_file_permission+0x89/0x1e0 [ 28.269704] [] ? rw_verify_area+0xe5/0x2b0 [ 28.275555] [] vfs_read+0x11e/0x380 [ 28.280796] [] SyS_read+0xd9/0x1b0 [ 28.285956] [] ? vfs_copy_file_range+0x740/0x740 [ 28.292330] [] ? do_syscall_64+0x48/0x490 [ 28.298094] [] ? vfs_copy_file_range+0x740/0x740 [ 28.304467] [] do_syscall_64+0x1a4/0x490 [ 28.310144] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.317032] Code: e9 27 fc ff ff 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 3d [ 28.343520] RIP [] __free_pages+0x21/0x80 [ 28.349402] RSP [ 28.353358] ---[ end trace 6c3360638fc41611 ]--- [ 28.358128] Kernel panic - not syncing: Fatal exception [ 28.363843] Dumping ftrace buffer: [ 28.367348] (ftrace buffer empty) [ 28.371025] Kernel Offset: disabled [ 28.374621] Rebooting in 86400 seconds..