[....] Starting enhanced syslogd: rsyslogd[ 10.223379] audit: type=1400 audit(1514771923.124:4): 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 '10.128.0.21' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 29.838033] kasan: CONFIG_KASAN_INLINE enabled [ 29.838740] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 29.839773] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.840595] Dumping ftrace buffer: [ 29.841106] (ftrace buffer empty) [ 29.841627] Modules linked in: [ 29.842098] CPU: 1 PID: 3334 Comm: syzkaller956369 Not tainted 4.9.73-gf3f3457 #11 [ 29.843125] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.844402] task: ffff8801cc19b000 task.stack: ffff8801c96b0000 [ 29.845216] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 29.846340] RSP: 0018:ffff8801c96b7a50 EFLAGS: 00010a07 [ 29.847057] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 29.848026] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 29.848977] RBP: ffff8801c96b7a60 R08: 0000000000000001 R09: 0000000000000000 [ 29.849929] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 29.850907] R13: 0000000000000020 R14: ffff8801c85a2100 R15: dffffc0000000000 [ 29.851875] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:000000000918f840 [ 29.852962] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.853746] CR2: 0000000020001000 CR3: 00000001c06a8000 CR4: 00000000001406e0 [ 29.854718] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.855670] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.856619] Stack: [ 29.856914] ffff8801cc19b000 ffff8801c85a2258 ffff8801c96b7ac0 ffffffff82664fc1 [ 29.858040] ffff8801c85a2270 ffffed00390b444b ffffed00390b444e ffff8801c85a2268 [ 29.863486] dead4ead00000000 ffff8801c85a2240 0000000000000000 0000000000000000 [ 29.871437] Call Trace: [ 29.873991] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 29.880449] [] sg_finish_rem_req+0x2b5/0x340 [ 29.886472] [] sg_new_read.isra.20+0x39/0x3e0 [ 29.892582] [] ? sg_get_rq_mark+0x142/0x190 [ 29.898518] [] sg_read+0x8bd/0x1440 [ 29.903761] [] ? save_stack_trace+0x16/0x20 [ 29.909698] [] ? save_stack+0x43/0xd0 [ 29.915115] [] ? kasan_slab_free+0x72/0xc0 [ 29.920974] [] ? kmem_cache_free+0xc7/0x300 [ 29.926926] [] ? putname+0xee/0x130 [ 29.932167] [] ? do_sys_open+0x252/0x4c0 [ 29.937846] [] ? do_fast_syscall_32+0x2f7/0x890 [ 29.944136] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 29.950770] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 29.957584] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 29.964490] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 29.971124] [] __vfs_read+0x103/0x670 [ 29.976541] [] ? default_llseek+0x290/0x290 [ 29.982478] [] ? fsnotify+0x86/0xf30 [ 29.987815] [] ? fsnotify+0xf30/0xf30 [ 29.993236] [] ? avc_policy_seqno+0x9/0x20 [ 29.999089] [] ? selinux_file_permission+0x82/0x460 [ 30.006110] [] ? security_file_permission+0x89/0x1e0 [ 30.012833] [] ? rw_verify_area+0xe5/0x2b0 [ 30.018685] [] vfs_read+0x11e/0x380 [ 30.023929] [] SyS_read+0xd9/0x1b0 [ 30.029086] [] ? vfs_copy_file_range+0x740/0x740 [ 30.035458] [] ? do_fast_syscall_32+0xcf/0x890 [ 30.041654] [] ? vfs_copy_file_range+0x740/0x740 [ 30.048025] [] do_fast_syscall_32+0x2f7/0x890 [ 30.054135] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.060767] [] entry_SYSENTER_compat+0x51/0x60 [ 30.066963] 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 [ 30.093397] RIP [] __free_pages+0x21/0x80 [ 30.099277] RSP [ 30.103233] ---[ end trace 74d267df828ee4d6 ]--- [ 30.107966] Kernel panic - not syncing: Fatal exception [ 30.113756] Dumping ftrace buffer: [ 30.117264] (ftrace buffer empty) [ 30.120942] Kernel Offset: disabled [ 30.124535] Rebooting in 86400 seconds..