[....] Starting enhanced syslogd: rsyslogd[ 10.668258] audit: type=1400 audit(1514740437.080:4): avc: denied { syslog } for pid=3169 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 file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.213' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 31.238303] kasan: CONFIG_KASAN_INLINE enabled [ 31.239022] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 31.240043] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 31.240866] Dumping ftrace buffer: [ 31.241363] (ftrace buffer empty) [ 31.241867] Modules linked in: [ 31.242335] CPU: 0 PID: 3334 Comm: syzkaller120386 Not tainted 4.9.73-gf3f3457 #11 [ 31.243340] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.244563] task: ffff8801c86e4800 task.stack: ffff8801c8898000 [ 31.245374] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 31.246482] RSP: 0018:ffff8801c889f940 EFLAGS: 00010a07 [ 31.247200] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 31.248150] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 31.249155] RBP: ffff8801c889f950 R08: 0000000000000001 R09: 0000000000000000 [ 31.250146] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 31.251141] R13: 0000000000000020 R14: ffff8801c8590000 R15: dffffc0000000000 [ 31.252104] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f77d1b40 [ 31.253191] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.253967] CR2: 0000000020060000 CR3: 00000001cbaa8000 CR4: 00000000001406f0 [ 31.254919] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.255869] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.256822] Stack: [ 31.257132] ffff8801c86e4800 ffff8801c8590158 ffff8801c889f9b0 ffffffff82664fc1 [ 31.258286] ffff8801c8590170 ffffed00390b202b ffffed00390b202e ffff8801c8590168 [ 31.265587] dead4ead00000000 ffff8801c8590140 0000000000000000 0000000000000000 [ 31.273802] Call Trace: [ 31.276360] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 31.282817] [] sg_finish_rem_req+0x2b5/0x340 [ 31.288841] [] sg_new_read.isra.20+0x39/0x3e0 [ 31.294954] [] ? sg_get_rq_mark+0x142/0x190 [ 31.300892] [] sg_read+0x8bd/0x1440 [ 31.306132] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 31.312770] [] ? fsnotify+0xf30/0xf30 [ 31.318186] [] ? avc_policy_seqno+0x9/0x20 [ 31.324043] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 31.331021] [] ? security_file_permission+0x89/0x1e0 [ 31.337741] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 31.344377] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 31.351722] [] compat_do_readv_writev+0x522/0x760 [ 31.358186] [] ? do_pwritev+0x1a0/0x1a0 [ 31.363777] [] ? exit_robust_list+0x230/0x230 [ 31.369893] [] ? check_preemption_disabled+0x3b/0x200 [ 31.376699] [] ? __fget+0x201/0x3a0 [ 31.381939] [] ? __fget+0x228/0x3a0 [ 31.387179] [] ? __fget+0x47/0x3a0 [ 31.392334] [] compat_readv+0xe3/0x150 [ 31.397836] [] do_compat_readv+0xf4/0x1d0 [ 31.403599] [] ? compat_readv+0x150/0x150 [ 31.410750] [] ? compat_SyS_sched_setaffinity+0xb7/0x110 [ 31.417815] [] ? compat_get_bitmap+0x1e0/0x1e0 [ 31.424014] [] compat_SyS_readv+0x26/0x30 [ 31.429778] [] ? SyS_pwritev2+0x80/0x80 [ 31.435373] [] do_fast_syscall_32+0x2f7/0x890 [ 31.441481] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.448117] [] entry_SYSENTER_compat+0x51/0x60 [ 31.454314] 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 [ 31.481000] RIP [] __free_pages+0x21/0x80 [ 31.486881] RSP [ 31.490578] ---[ end trace ed6e5aee92120500 ]--- [ 31.495998] Kernel panic - not syncing: Fatal exception [ 31.501722] Dumping ftrace buffer: [ 31.505231] (ftrace buffer empty) [ 31.508907] Kernel Offset: disabled [ 31.512498] Rebooting in 86400 seconds..