[....] Starting enhanced syslogd: rsyslogd[ 11.985988] audit: type=1400 audit(1514933049.852:4): avc: denied { syslog } for pid=3156 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 '10.128.15.237' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 24.318070] kasan: CONFIG_KASAN_INLINE enabled [ 24.322661] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 24.330076] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 24.336272] Dumping ftrace buffer: [ 24.339773] (ftrace buffer empty) [ 24.343448] Modules linked in: [ 24.346714] CPU: 1 PID: 3314 Comm: syzkaller798733 Not tainted 4.9.74-g9e5dd8e #12 [ 24.354383] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.363700] task: ffff8801ce7c6000 task.stack: ffff8801c8670000 [ 24.369718] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 24.377939] RSP: 0018:ffff8801c8677940 EFLAGS: 00010a07 [ 24.383352] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826649fb [ 24.390587] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 24.397820] RBP: ffff8801c8677950 R08: 0000000000000001 R09: 0000000000000000 [ 24.405403] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 24.412637] R13: 0000000000000020 R14: ffff8801c8a72100 R15: dffffc0000000000 [ 24.419871] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000008705840 [ 24.428058] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 24.433902] CR2: 0000000020ef0fe0 CR3: 00000001c771e000 CR4: 00000000001606e0 [ 24.441138] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.448370] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.455603] Stack: [ 24.457716] ffff8801ce7c6000 ffff8801c8a72258 ffff8801c86779b0 ffffffff82664a21 [ 24.465664] ffff8801c8a72270 ffffed003914e44b ffffed003914e44e ffff8801c8a72268 [ 24.473605] dead4ead00000000 ffff8801c8a72240 0000000000000000 0000000000000000 [ 24.481551] Call Trace: [ 24.484111] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 24.490566] [] sg_finish_rem_req+0x2b5/0x340 [ 24.496586] [] sg_new_read.isra.20+0x39/0x3e0 [ 24.502692] [] ? sg_get_rq_mark+0x142/0x190 [ 24.508635] [] sg_read+0x8bd/0x1440 [ 24.513877] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.520506] [] ? fsnotify+0xf30/0xf30 [ 24.525923] [] ? avc_policy_seqno+0x9/0x20 [ 24.531775] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 24.538754] [] ? security_file_permission+0x89/0x1e0 [ 24.545473] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.552106] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 24.558739] [] compat_do_readv_writev+0x522/0x760 [ 24.565195] [] ? do_pwritev+0x1a0/0x1a0 [ 24.570784] [] ? __lru_cache_add+0x187/0x250 [ 24.576807] [] ? _raw_spin_unlock+0x2c/0x50 [ 24.582746] [] ? handle_mm_fault+0x6ee/0x2530 [ 24.588856] [] ? __pmd_alloc+0x410/0x410 [ 24.594530] [] compat_readv+0xe3/0x150 [ 24.600029] [] do_compat_readv+0xf4/0x1d0 [ 24.605788] [] ? compat_readv+0x150/0x150 [ 24.611550] [] compat_SyS_readv+0x26/0x30 [ 24.617313] [] ? SyS_pwritev2+0x80/0x80 [ 24.622899] [] do_fast_syscall_32+0x2f7/0x890 [ 24.629005] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.635634] [] entry_SYSENTER_compat+0x51/0x60 [ 24.641826] 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 [ 24.668063] RIP [] __free_pages+0x21/0x80 [ 24.673938] RSP [ 24.678600] ---[ end trace bd929e4ff98d6ada ]--- [ 24.683695] Kernel panic - not syncing: Fatal exception [ 24.689394] Dumping ftrace buffer: [ 24.692922] (ftrace buffer empty) [ 24.696598] Kernel Offset: disabled [ 24.700192] Rebooting in 86400 seconds..