[....] Starting enhanced syslogd: rsyslogd[ 13.204308] audit: type=1400 audit(1515578774.384:4): avc: denied { syslog } for pid=3179 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 '10.128.15.205' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.804604] kasan: CONFIG_KASAN_INLINE enabled [ 27.809221] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.816599] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.822816] Dumping ftrace buffer: [ 27.826322] (ftrace buffer empty) [ 27.829995] Modules linked in: [ 27.833267] CPU: 0 PID: 3337 Comm: syzkaller384383 Not tainted 4.9.76-g9154940 #20 [ 27.840934] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.850272] task: ffff8801c992b000 task.stack: ffff8801c7348000 [ 27.856293] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 27.864517] RSP: 0018:ffff8801c734f940 EFLAGS: 00010a07 [ 27.869939] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266640b [ 27.877184] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.884428] RBP: ffff8801c734f950 R08: 0000000000000001 R09: 0000000000000000 [ 27.891679] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.898940] R13: 0000000000000020 R14: ffff8801c7400000 R15: dffffc0000000000 [ 27.906178] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000008ed1840 [ 27.914370] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.920216] CR2: 0000000020ef0fe0 CR3: 00000001c7430000 CR4: 0000000000160670 [ 27.927541] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.934777] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.942019] Stack: [ 27.944134] ffff8801c992b000 ffff8801c7400158 ffff8801c734f9b0 ffffffff82666431 [ 27.952105] ffff8801c7400170 ffffed0038e8002b ffffed0038e8002e ffff8801c7400168 [ 27.960059] dead4ead00000000 ffff8801c7400140 0000000000000000 0000000000000000 [ 27.968010] Call Trace: [ 27.970567] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.977024] [] sg_finish_rem_req+0x2b5/0x340 [ 27.983068] [] sg_new_read.isra.20+0x39/0x3e0 [ 27.989179] [] ? sg_get_rq_mark+0x142/0x190 [ 27.995115] [] sg_read+0x8bd/0x1440 [ 28.000356] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.007421] [] ? fsnotify+0xf30/0xf30 [ 28.012840] [] ? avc_policy_seqno+0x9/0x20 [ 28.018690] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 28.025682] [] ? security_file_permission+0x89/0x1e0 [ 28.032406] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.039049] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.045681] [] compat_do_readv_writev+0x522/0x760 [ 28.052141] [] ? do_pwritev+0x1a0/0x1a0 [ 28.057739] [] ? __lru_cache_add+0x187/0x250 [ 28.063766] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.069710] [] ? handle_mm_fault+0x6ee/0x2530 [ 28.075820] [] ? __pmd_alloc+0x410/0x410 [ 28.081495] [] compat_readv+0xe3/0x150 [ 28.087010] [] do_compat_readv+0xf4/0x1d0 [ 28.092775] [] ? compat_readv+0x150/0x150 [ 28.098539] [] compat_SyS_readv+0x26/0x30 [ 28.104306] [] ? SyS_pwritev2+0x80/0x80 [ 28.109904] [] do_fast_syscall_32+0x2f7/0x890 [ 28.116015] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.122648] [] entry_SYSENTER_compat+0x74/0x83 [ 28.128842] 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 [ 28.155176] RIP [] __free_pages+0x21/0x80 [ 28.161060] RSP [ 28.165063] ---[ end trace 685112fa8a916518 ]--- [ 28.169806] Kernel panic - not syncing: Fatal exception [ 28.175572] Dumping ftrace buffer: [ 28.179082] (ftrace buffer empty) [ 28.182757] Kernel Offset: disabled [ 28.186350] Rebooting in 86400 seconds..