[....] Starting enhanced syslogd: rsyslogd[ 10.838837] audit: type=1400 audit(1514750243.909:4): avc: denied { syslog } for pid=3177 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[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?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 '10.128.0.50' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.666457] kasan: CONFIG_KASAN_INLINE enabled [ 19.667137] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.668298] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.669131] Dumping ftrace buffer: [ 19.669630] (ftrace buffer empty) [ 19.670136] Modules linked in: [ 19.670600] CPU: 1 PID: 3326 Comm: syzkaller182364 Not tainted 4.9.73-gf3f3457 #11 [ 19.671607] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.672840] task: ffff8801c9bcc800 task.stack: ffff8801c8418000 [ 19.673636] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.674747] RSP: 0018:ffff8801c841fa50 EFLAGS: 00010a07 [ 19.675464] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 19.676439] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 19.677389] RBP: ffff8801c841fa60 R08: 0000000000000001 R09: 0000000000000000 [ 19.678383] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 19.679336] R13: 0000000000000020 R14: ffff8801c8814200 R15: dffffc0000000000 [ 19.680308] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008f07840 [ 19.681382] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.682165] CR2: 0000000020671f39 CR3: 00000001c215b000 CR4: 00000000001406e0 [ 19.683187] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.684140] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.685091] Stack: [ 19.685385] ffff8801c9bcc800 ffff8801c8814358 ffff8801c841fac0 ffffffff82664fc1 [ 19.686509] ffff8801c8814370 ffffed003910286b ffffed003910286e ffff8801c8814368 [ 19.691950] dead4ead00000000 ffff8801c8814340 0000000000000000 0000000000000000 [ 19.699901] Call Trace: [ 19.702454] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.708913] [] sg_finish_rem_req+0x2b5/0x340 [ 19.714936] [] sg_new_read.isra.20+0x39/0x3e0 [ 19.721052] [] ? sg_get_rq_mark+0x142/0x190 [ 19.726994] [] sg_read+0x8bd/0x1440 [ 19.732241] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.738874] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 19.745939] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.752574] [] __vfs_read+0x103/0x670 [ 19.758000] [] ? default_llseek+0x290/0x290 [ 19.763944] [] ? fsnotify+0x86/0xf30 [ 19.769275] [] ? fsnotify+0xf30/0xf30 [ 19.774700] [] ? avc_policy_seqno+0x9/0x20 [ 19.780556] [] ? selinux_file_permission+0x82/0x460 [ 19.787189] [] ? security_file_permission+0x89/0x1e0 [ 19.793919] [] ? rw_verify_area+0xe5/0x2b0 [ 19.799768] [] vfs_read+0x11e/0x380 [ 19.805010] [] SyS_read+0xd9/0x1b0 [ 19.810176] [] ? vfs_copy_file_range+0x740/0x740 [ 19.816546] [] ? do_fast_syscall_32+0xcf/0x890 [ 19.822742] [] ? vfs_copy_file_range+0x740/0x740 [ 19.829112] [] do_fast_syscall_32+0x2f7/0x890 [ 19.835225] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 19.841857] [] entry_SYSENTER_compat+0x51/0x60 [ 19.848052] 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 [ 19.874316] RIP [] __free_pages+0x21/0x80 [ 19.880203] RSP [ 19.884301] ---[ end trace a0c570fc453a1ebf ]--- [ 19.889119] Kernel panic - not syncing: Fatal exception [ 19.894884] Dumping ftrace buffer: [ 19.898391] (ftrace buffer empty) [ 19.902065] Kernel Offset: disabled [ 19.905656] Rebooting in 86400 seconds..