[....] Starting enhanced syslogd: rsyslogd[ 10.280518] audit: type=1400 audit(1514752817.489:4): avc: denied { syslog } for pid=3165 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 '10.128.15.206' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.856258] kasan: CONFIG_KASAN_INLINE enabled [ 19.856955] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.857975] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.858806] Dumping ftrace buffer: [ 19.859278] (ftrace buffer empty) [ 19.859772] Modules linked in: [ 19.860251] CPU: 0 PID: 3318 Comm: syzkaller221741 Not tainted 4.9.73-gf3f3457 #11 [ 19.861287] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.862534] task: ffff8801cb4cc800 task.stack: ffff8801ca708000 [ 19.863345] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 19.864459] RSP: 0018:ffff8801ca70fa50 EFLAGS: 00010a07 [ 19.865208] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b [ 19.866159] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 19.867162] RBP: ffff8801ca70fa60 R08: 0000000000000001 R09: 0000000000000000 [ 19.868112] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 19.869078] R13: 0000000000000020 R14: ffff8801c8a34200 R15: dffffc0000000000 [ 19.870070] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000900a840 [ 19.871147] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.872001] CR2: 0000000020001000 CR3: 00000001c6ca8000 CR4: 00000000001406f0 [ 19.872974] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.873925] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.874895] Stack: [ 19.875205] ffff8801cb4cc800 ffff8801c8a34358 ffff8801ca70fac0 ffffffff82664fc1 [ 19.876379] ffff8801c8a34370 ffffed003914686b ffffed003914686e ffff8801c8a34368 [ 19.884762] dead4ead00000000 ffff8801c8a34340 0000000000000000 0000000000000000 [ 19.892703] Call Trace: [ 19.895254] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 19.901709] [] sg_finish_rem_req+0x2b5/0x340 [ 19.907729] [] sg_new_read.isra.20+0x39/0x3e0 [ 19.913835] [] ? sg_get_rq_mark+0x142/0x190 [ 19.919768] [] sg_read+0x8bd/0x1440 [ 19.925007] [] ? save_stack_trace+0x16/0x20 [ 19.930942] [] ? save_stack+0x43/0xd0 [ 19.936356] [] ? kasan_slab_free+0x72/0xc0 [ 19.942202] [] ? kmem_cache_free+0xc7/0x300 [ 19.948137] [] ? putname+0xee/0x130 [ 19.953376] [] ? do_sys_open+0x252/0x4c0 [ 19.959052] [] ? do_fast_syscall_32+0x2f7/0x890 [ 19.965332] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.971963] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 19.978765] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 19.985652] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 19.992281] [] __vfs_read+0x103/0x670 [ 19.997700] [] ? default_llseek+0x290/0x290 [ 20.003644] [] ? fsnotify+0x86/0xf30 [ 20.008972] [] ? fsnotify+0xf30/0xf30 [ 20.014385] [] ? avc_policy_seqno+0x9/0x20 [ 20.020244] [] ? selinux_file_permission+0x82/0x460 [ 20.026872] [] ? security_file_permission+0x89/0x1e0 [ 20.033588] [] ? rw_verify_area+0xe5/0x2b0 [ 20.039434] [] vfs_read+0x11e/0x380 [ 20.044683] [] SyS_read+0xd9/0x1b0 [ 20.049835] [] ? vfs_copy_file_range+0x740/0x740 [ 20.056207] [] ? do_fast_syscall_32+0xcf/0x890 [ 20.062405] [] ? vfs_copy_file_range+0x740/0x740 [ 20.068774] [] do_fast_syscall_32+0x2f7/0x890 [ 20.074883] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.081514] [] entry_SYSENTER_compat+0x51/0x60 [ 20.087708] 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 [ 20.113988] RIP [] __free_pages+0x21/0x80 [ 20.119864] RSP [ 20.123546] ---[ end trace 5a51858e61efd0ec ]--- [ 20.128277] Kernel panic - not syncing: Fatal exception [ 20.134053] Dumping ftrace buffer: [ 20.137563] (ftrace buffer empty) [ 20.141236] Kernel Offset: disabled [ 20.144827] Rebooting in 86400 seconds..