[....] Starting enhanced syslogd: rsyslogd[ 14.254442] audit: type=1400 audit(1515452291.220:4): avc: denied { syslog } for pid=3175 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 '10.128.0.6' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 25.036845] kasan: CONFIG_KASAN_INLINE enabled [ 25.041461] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 25.048941] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 25.055162] Dumping ftrace buffer: [ 25.058671] (ftrace buffer empty) [ 25.062347] Modules linked in: [ 25.065623] CPU: 0 PID: 3330 Comm: syzkaller107239 Not tainted 4.9.75-gb54d99a #18 [ 25.073304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.082624] task: ffff8801cc36b000 task.stack: ffff8801ca0f0000 [ 25.088646] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 25.096874] RSP: 0018:ffff8801ca0f7a50 EFLAGS: 00010a07 [ 25.102288] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 25.109537] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 25.116777] RBP: ffff8801ca0f7a60 R08: 0000000000000001 R09: 0000000000000000 [ 25.124020] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 25.131264] R13: 0000000000000020 R14: ffff8801c8768000 R15: dffffc0000000000 [ 25.138502] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000095b4840 [ 25.146704] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 25.152551] CR2: 0000000020000000 CR3: 00000001c9e76000 CR4: 0000000000160670 [ 25.159788] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.167024] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.174258] Stack: [ 25.176373] ffff8801cc36b000 ffff8801c8768158 ffff8801ca0f7ac0 ffffffff82666341 [ 25.184331] ffff8801c8768170 ffffed00390ed02b ffffed00390ed02e ffff8801c8768168 [ 25.192284] dead4ead00000000 ffff8801c8768140 0000000000000000 0000000000000000 [ 25.200232] Call Trace: [ 25.202791] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 25.209262] [] sg_finish_rem_req+0x2b5/0x340 [ 25.215285] [] sg_new_read.isra.20+0x39/0x3e0 [ 25.221405] [] ? sg_get_rq_mark+0x142/0x190 [ 25.227341] [] sg_read+0x8bd/0x1440 [ 25.232590] [] ? save_stack_trace+0x16/0x20 [ 25.238529] [] ? save_stack+0x43/0xd0 [ 25.243952] [] ? kasan_slab_free+0x72/0xc0 [ 25.249802] [] ? kmem_cache_free+0xc7/0x300 [ 25.255737] [] ? putname+0xee/0x130 [ 25.260982] [] ? do_sys_open+0x252/0x4c0 [ 25.266670] [] ? do_fast_syscall_32+0x2f7/0x890 [ 25.272956] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 25.279600] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 25.286416] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 25.293309] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 25.299940] [] __vfs_read+0x103/0x670 [ 25.305355] [] ? default_llseek+0x290/0x290 [ 25.311292] [] ? fsnotify+0x86/0xf30 [ 25.316633] [] ? fsnotify+0xf30/0xf30 [ 25.322064] [] ? avc_policy_seqno+0x9/0x20 [ 25.327934] [] ? selinux_file_permission+0x82/0x460 [ 25.334588] [] ? security_file_permission+0x89/0x1e0 [ 25.341311] [] ? rw_verify_area+0xe5/0x2b0 [ 25.347164] [] vfs_read+0x11e/0x380 [ 25.352407] [] SyS_read+0xd9/0x1b0 [ 25.357582] [] ? vfs_copy_file_range+0x740/0x740 [ 25.363954] [] ? do_fast_syscall_32+0xcf/0x890 [ 25.370151] [] ? vfs_copy_file_range+0x740/0x740 [ 25.376532] [] do_fast_syscall_32+0x2f7/0x890 [ 25.382642] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.389274] [] entry_SYSENTER_compat+0x74/0x83 [ 25.395467] 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 [ 25.421828] RIP [] __free_pages+0x21/0x80 [ 25.427707] RSP [ 25.431550] ---[ end trace ce70ded949d25dac ]--- [ 25.436563] Kernel panic - not syncing: Fatal exception [ 25.442378] Dumping ftrace buffer: [ 25.445887] (ftrace buffer empty) [ 25.449566] Kernel Offset: disabled [ 25.453163] Rebooting in 86400 seconds..