[....] Starting enhanced syslogd: rsyslogd[ 10.960126] audit: type=1400 audit(1514729123.261:4): avc: denied { syslog } for pid=3171 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 '10.128.0.35' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 19.369011] kasan: CONFIG_KASAN_INLINE enabled [ 19.369796] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.370766] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.371585] Dumping ftrace buffer: [ 19.372059] (ftrace buffer empty) [ 19.372568] Modules linked in: [ 19.373037] CPU: 0 PID: 3321 Comm: syzkaller845560 Not tainted 4.9.73-gf3f3457 #11 [ 19.374041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.375277] task: ffff8801cb089800 task.stack: ffff8801cbdb8000 [ 19.376070] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.377193] RSP: 0018:ffff8801cbdbfa50 EFLAGS: 00010a07 [ 19.377910] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 19.378859] RDX: 1bd5a9d5a0000003 RSI: 0000000000000020 RDI: dead4ead0000001c [ 19.379809] RBP: ffff8801cbdbfa60 R08: 0000000000000001 R09: 0000000000000000 [ 19.380774] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 19.381724] R13: 0000000000000020 R14: ffff8801c8674200 R15: dffffc0000000000 [ 19.382686] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7789b40 [ 19.383757] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.384545] CR2: 00000000f7789db0 CR3: 00000001cb392000 CR4: 00000000001406f0 [ 19.385496] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.386462] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.387411] Stack: [ 19.387705] ffff8801cb089800 ffff8801c8674358 ffff8801cbdbfac0 ffffffff82664fc1 [ 19.388832] ffff8801c8674370 ffffed00390ce86b ffffed00390ce86e ffff8801c8674368 [ 19.394900] dead4ead00000000 ffff8801c8674340 0000000000000000 0000000000000000 [ 19.402841] Call Trace: [ 19.405394] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.411851] [] sg_finish_rem_req+0x2b5/0x340 [ 19.417872] [] sg_new_read.isra.20+0x39/0x3e0 [ 19.423980] [] ? sg_get_rq_mark+0x142/0x190 [ 19.429914] [] sg_read+0x8bd/0x1440 [ 19.435156] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.441789] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 19.448766] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 19.455742] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.462371] [] __vfs_read+0x103/0x670 [ 19.467784] [] ? default_llseek+0x290/0x290 [ 19.473718] [] ? fsnotify+0x86/0xf30 [ 19.479053] [] ? fsnotify+0xf30/0xf30 [ 19.484472] [] ? avc_policy_seqno+0x9/0x20 [ 19.490321] [] ? selinux_file_permission+0x82/0x460 [ 19.496950] [] ? security_file_permission+0x89/0x1e0 [ 19.503683] [] ? rw_verify_area+0xe5/0x2b0 [ 19.509533] [] vfs_read+0x11e/0x380 [ 19.514773] [] SyS_read+0xd9/0x1b0 [ 19.519925] [] ? vfs_copy_file_range+0x740/0x740 [ 19.526295] [] ? do_fast_syscall_32+0xcf/0x890 [ 19.532488] [] ? vfs_copy_file_range+0x740/0x740 [ 19.538859] [] do_fast_syscall_32+0x2f7/0x890 [ 19.544971] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 19.551603] [] entry_SYSENTER_compat+0x51/0x60 [ 19.557794] 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 [ 19.584073] RIP [] __free_pages+0x21/0x80 [ 19.589949] RSP [ 19.593834] ---[ end trace 8dcd7481cea98b03 ]--- [ 19.598573] Kernel panic - not syncing: Fatal exception [ 19.603948] Dumping ftrace buffer: [ 19.607457] (ftrace buffer empty) [ 19.611132] Kernel Offset: disabled [ 19.614721] Rebooting in 86400 seconds..