[....] Starting enhanced syslogd: rsyslogd[ 13.551796] audit: type=1400 audit(1519246543.548:4): avc: denied { syslog } for pid=3649 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 '10.128.15.214' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.145323] kasan: CONFIG_KASAN_INLINE enabled [ 26.150002] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.157369] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.163582] Dumping ftrace buffer: [ 26.167091] (ftrace buffer empty) [ 26.170771] Modules linked in: [ 26.174053] CPU: 1 PID: 3805 Comm: syzkaller597039 Not tainted 4.9.82-g7ec482b #38 [ 26.181726] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.191055] task: ffff8801b35b8000 task.stack: ffff8801d7e00000 [ 26.197083] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 26.205329] RSP: 0018:ffff8801d7e07a60 EFLAGS: 00010a07 [ 26.210745] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266867b [ 26.217986] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.225224] RBP: ffff8801d7e07a70 R08: 0000000000000001 R09: 0000000000000001 [ 26.232469] R10: 0000000000000000 R11: ffff8801b35b8000 R12: 0000000000000004 [ 26.239714] R13: 0000000000000020 R14: ffff8801b1974200 R15: dffffc0000000000 [ 26.246964] FS: 000000000175a880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.255159] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.261011] CR2: 00000000205c5fc7 CR3: 00000001d84d0000 CR4: 0000000000160670 [ 26.268263] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.275504] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.282744] Stack: [ 26.284862] ffffffff838b57e9 ffff8801b1974358 ffff8801d7e07ad0 ffffffff826686a1 [ 26.292830] ffff8801b1974370 ffffed003632e86b ffffed003632e86e ffff8801b1974368 [ 26.300786] dead4ead00000000 ffff8801b1974340 0000000000000000 0000000000000000 [ 26.308760] Call Trace: [ 26.311318] [] ? retint_kernel+0x2d/0x2d [ 26.317031] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 26.323514] [] sg_finish_rem_req+0x2b5/0x340 [ 26.329552] [] sg_new_read.isra.20+0x356/0x3e0 [ 26.335768] [] ? sg_idr_max_id+0xb/0x60 [ 26.341360] [] sg_read+0x8b7/0x1440 [ 26.346608] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 26.353244] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 26.360313] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 26.366946] [] __vfs_read+0x103/0x670 [ 26.372364] [] ? default_llseek+0x290/0x290 [ 26.378305] [] ? fsnotify+0x86/0xf30 [ 26.383634] [] ? fsnotify+0xf30/0xf30 [ 26.389072] [] ? avc_policy_seqno+0x9/0x20 [ 26.394936] [] ? selinux_file_permission+0x82/0x460 [ 26.401581] [] ? security_file_permission+0x89/0x1e0 [ 26.408317] [] ? rw_verify_area+0xe5/0x2b0 [ 26.414184] [] vfs_read+0x11e/0x380 [ 26.419457] [] SyS_read+0xd9/0x1b0 [ 26.424619] [] ? vfs_copy_file_range+0x740/0x740 [ 26.430992] [] ? do_syscall_64+0x48/0x490 [ 26.436761] [] ? vfs_copy_file_range+0x740/0x740 [ 26.443143] [] do_syscall_64+0x1a5/0x490 [ 26.448832] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 26.455736] 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 [ 26.482399] RIP [] __free_pages+0x21/0x80 [ 26.488283] RSP [ 26.492165] ---[ end trace 4775c591d1ecac5b ]--- [ 26.497095] Kernel panic - not syncing: Fatal exception [ 26.502863] Dumping ftrace buffer: [ 26.506385] (ftrace buffer empty) [ 26.510066] Kernel Offset: disabled [ 26.513673] Rebooting in 86400 seconds..