[....] Starting enhanced syslogd: rsyslogd[ 10.645289] audit: type=1400 audit(1514450373.282:4): avc: denied { syslog } for pid=3170 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 periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] 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 '10.128.0.20' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.454416] kasan: CONFIG_KASAN_INLINE enabled [ 19.455138] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.456133] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.456954] Dumping ftrace buffer: [ 19.457427] (ftrace buffer empty) [ 19.457937] Modules linked in: [ 19.458433] CPU: 0 PID: 3318 Comm: syzkaller099631 Not tainted 4.9.72-gcb7518e #10 [ 19.459506] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.460921] task: ffff8801cbc13000 task.stack: ffff8801c9298000 [ 19.461718] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.462838] RSP: 0018:ffff8801c929fa50 EFLAGS: 00010a07 [ 19.463567] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 19.464558] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 19.465508] RBP: ffff8801c929fa60 R08: 0000000000000001 R09: 0000000000000000 [ 19.466500] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 19.467512] R13: 0000000000000020 R14: ffff8801c97fa100 R15: dffffc0000000000 [ 19.468475] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000087fa840 [ 19.469605] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.470391] CR2: 0000000020002000 CR3: 00000001c9ede000 CR4: 00000000001406f0 [ 19.471396] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.472384] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.473355] Stack: [ 19.473689] ffff8801cbc13000 ffff8801c97fa258 ffff8801c929fac0 ffffffff82664fc1 [ 19.476745] ffff8801c97fa270 ffffed00392ff44b ffffed00392ff44e ffff8801c97fa268 [ 19.484719] dead4ead00000000 ffff8801c97fa240 0000000000000000 0000000000000000 [ 19.492679] Call Trace: [ 19.495236] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.501691] [] sg_finish_rem_req+0x2b5/0x340 [ 19.507712] [] sg_new_read.isra.20+0x39/0x3e0 [ 19.513823] [] ? sg_get_rq_mark+0x142/0x190 [ 19.519759] [] sg_read+0x8bd/0x1440 [ 19.525001] [] ? save_stack_trace+0x16/0x20 [ 19.530937] [] ? save_stack+0x43/0xd0 [ 19.536352] [] ? kasan_slab_free+0x72/0xc0 [ 19.542202] [] ? kmem_cache_free+0xc7/0x300 [ 19.548138] [] ? putname+0xee/0x130 [ 19.553383] [] ? do_sys_open+0x252/0x4c0 [ 19.559061] [] ? do_fast_syscall_32+0x2f7/0x890 [ 19.565353] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.571986] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 19.578795] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 19.585686] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.592318] [] __vfs_read+0x103/0x670 [ 19.597733] [] ? default_llseek+0x290/0x290 [ 19.603669] [] ? fsnotify+0x86/0xf30 [ 19.608997] [] ? fsnotify+0xf30/0xf30 [ 19.614413] [] ? avc_policy_seqno+0x9/0x20 [ 19.620275] [] ? selinux_file_permission+0x82/0x460 [ 19.626904] [] ? security_file_permission+0x89/0x1e0 [ 19.633624] [] ? rw_verify_area+0xe5/0x2b0 [ 19.639473] [] vfs_read+0x11e/0x380 [ 19.644717] [] SyS_read+0xd9/0x1b0 [ 19.649891] [] ? vfs_copy_file_range+0x740/0x740 [ 19.656267] [] ? do_fast_syscall_32+0xcf/0x890 [ 19.662464] [] ? vfs_copy_file_range+0x740/0x740 [ 19.668842] [] do_fast_syscall_32+0x2f7/0x890 [ 19.674957] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 19.681596] [] entry_SYSENTER_compat+0x51/0x60 [ 19.687789] 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 [ 19.714184] RIP [] __free_pages+0x21/0x80 [ 19.720064] RSP [ 19.724200] ---[ end trace 9bfbb8cc06c5a6e2 ]--- [ 19.728949] Kernel panic - not syncing: Fatal exception [ 19.734773] Dumping ftrace buffer: [ 19.738285] (ftrace buffer empty) [ 19.741960] Kernel Offset: disabled [ 19.745553] Rebooting in 86400 seconds..