[....] Starting enhanced syslogd: rsyslogd[ 10.182314] audit: type=1400 audit(1515341063.993:4): avc: denied { syslog } for pid=3178 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] 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 '10.128.15.215' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 49.997164] kasan: CONFIG_KASAN_INLINE enabled [ 49.997917] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 49.998897] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 49.999718] Dumping ftrace buffer: [ 50.000210] (ftrace buffer empty) [ 50.000709] Modules linked in: [ 50.001178] CPU: 1 PID: 3350 Comm: syzkaller775761 Not tainted 4.9.75-g5f5e5d4 #7 [ 50.002228] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.003461] task: ffff8801c91cc800 task.stack: ffff8801c7f60000 [ 50.004256] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 50.005373] RSP: 0018:ffff8801c7f679b0 EFLAGS: 00010a07 [ 50.006092] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 50.007042] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 50.007992] RBP: ffff8801c7f679c0 R08: 0000000000000001 R09: 0000000000000001 [ 50.008976] R10: 0000000000000000 R11: ffff8801c91cc800 R12: 0000000000000004 [ 50.009956] R13: 0000000000000020 R14: ffff8801c1444200 R15: dffffc0000000000 [ 50.010907] FS: 0000000001d74880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 50.011980] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.012792] CR2: 000000000043e5b0 CR3: 00000001cbe4a000 CR4: 0000000000160670 [ 50.013779] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.014731] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.015691] Stack: [ 50.015986] 0000000000000001 ffff8801c1444358 ffff8801c7f67a20 ffffffff82666341 [ 50.017146] ffff8801c1444370 ffffed003828886b ffffed003828886e ffff8801c1444368 [ 50.024429] dead4ead00000000 ffff8801c1444340 0000000000000000 0000000000000000 [ 50.032377] Call Trace: [ 50.034933] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 50.041398] [] sg_finish_rem_req+0x2b5/0x340 [ 50.047422] [] sg_new_read.isra.20+0x356/0x3e0 [ 50.053619] [] ? sg_get_rq_mark+0x112/0x190 [ 50.059566] [] sg_read+0x8bd/0x1440 [ 50.064815] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 50.071446] [] ? fsnotify+0xf30/0xf30 [ 50.076863] [] ? avc_policy_seqno+0x9/0x20 [ 50.082714] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 50.089691] [] ? security_file_permission+0x89/0x1e0 [ 50.096410] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 50.103041] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 50.109672] [] do_readv_writev+0x520/0x750 [ 50.115521] [] ? vfs_write+0x530/0x530 [ 50.121022] [] ? sg_ioctl+0x2c30/0x2c30 [ 50.126621] [] ? __vfs_write+0x10b/0x680 [ 50.132304] [] ? do_iter_readv_writev+0x400/0x400 [ 50.138763] [] ? __might_sleep+0x95/0x1a0 [ 50.144529] [] ? __inode_security_revalidate+0xd9/0x130 [ 50.151517] [] ? __fsnotify_parent+0xbc/0x340 [ 50.157634] [] ? avc_policy_seqno+0x9/0x20 [ 50.163485] [] ? fsnotify+0x86/0xf30 [ 50.168819] [] ? fsnotify+0xf30/0xf30 [ 50.174236] [] vfs_readv+0x84/0xc0 [ 50.179392] [] do_readv+0xe6/0x250 [ 50.184552] [] ? vfs_readv+0xc0/0xc0 [ 50.189881] [] ? entry_SYSCALL_64_fastpath+0x5/0xe2 [ 50.196520] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 50.203325] [] SyS_readv+0x27/0x30 [ 50.208486] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 50.215043] 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 [ 50.241307] RIP [] __free_pages+0x21/0x80 [ 50.247187] RSP [ 50.251068] ---[ end trace a172999c3acf1ea2 ]--- [ 50.255880] Kernel panic - not syncing: Fatal exception [ 50.261598] Dumping ftrace buffer: [ 50.265105] (ftrace buffer empty) [ 50.268781] Kernel Offset: disabled [ 50.272382] Rebooting in 86400 seconds..