[....] Starting enhanced syslogd: rsyslogd[ 13.362956] audit: type=1400 audit(1521453034.524:4): 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[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 '10.128.0.47' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.709486] kasan: CONFIG_KASAN_INLINE enabled [ 26.714091] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.721602] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.727820] Dumping ftrace buffer: [ 26.731326] (ftrace buffer empty) [ 26.735013] Modules linked in: [ 26.738294] CPU: 1 PID: 3805 Comm: syzkaller637875 Not tainted 4.9.88-gbb52bba #59 [ 26.745967] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.755294] task: ffff8801d7e11800 task.stack: ffff8801b1738000 [ 26.761316] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 26.769544] RSP: 0018:ffff8801b173fa60 EFLAGS: 00010a07 [ 26.774959] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82669b0b [ 26.782198] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.789435] RBP: ffff8801b173fa70 R08: 0000000000000001 R09: 0000000000000001 [ 26.796675] R10: 0000000000000000 R11: ffff8801d7e11800 R12: 0000000000000004 [ 26.803913] R13: 0000000000000020 R14: ffff8801d81a2100 R15: dffffc0000000000 [ 26.811152] FS: 0000000001674880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.819346] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.825194] CR2: 0000000000000000 CR3: 00000001d8c7e000 CR4: 0000000000160670 [ 26.832435] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.839672] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.846910] Stack: [ 26.849028] 0000000000000001 ffff8801d81a2258 ffff8801b173fad0 ffffffff82669b31 [ 26.856993] ffff8801d81a2270 ffffed003b03444b ffffed003b03444e ffff8801d81a2268 [ 26.864954] dead4ead00000000 ffff8801d81a2240 0000000000000000 0000000000000000 [ 26.872918] Call Trace: [ 26.875477] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 26.881936] [] sg_finish_rem_req+0x2b5/0x340 [ 26.887963] [] sg_new_read.isra.20+0x356/0x3e0 [ 26.894163] [] ? sg_get_rq_mark+0xf6/0x190 [ 26.900016] [] sg_read+0x8b7/0x1440 [ 26.905260] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 26.911898] [] ? do_readv_writev+0x1f9/0x740 [ 26.917925] [] ? vfs_write+0x530/0x530 [ 26.923432] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 26.930327] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 26.936961] [] __vfs_read+0x103/0x670 [ 26.942380] [] ? default_llseek+0x290/0x290 [ 26.948318] [] ? fsnotify+0x86/0xf30 [ 26.953647] [] ? fsnotify+0xf30/0xf30 [ 26.959067] [] ? avc_policy_seqno+0x9/0x20 [ 26.964925] [] ? selinux_file_permission+0x82/0x460 [ 26.971559] [] ? security_file_permission+0x89/0x1e0 [ 26.978281] [] ? rw_verify_area+0xe5/0x2b0 [ 26.984133] [] vfs_read+0x11e/0x380 [ 26.989378] [] SyS_read+0xd9/0x1b0 [ 26.994535] [] ? vfs_copy_file_range+0x740/0x740 [ 27.000912] [] ? do_vfs_ioctl+0x1140/0x1140 [ 27.006852] [] ? do_syscall_64+0x48/0x490 [ 27.012618] [] ? vfs_copy_file_range+0x740/0x740 [ 27.018990] [] do_syscall_64+0x1a4/0x490 [ 27.024667] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.031557] 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 [ 27.058547] RIP [] __free_pages+0x21/0x80 [ 27.064428] RSP [ 27.068478] ---[ end trace ed065db7950cb3e3 ]--- [ 27.073235] Kernel panic - not syncing: Fatal exception [ 27.079021] Dumping ftrace buffer: [ 27.082532] (ftrace buffer empty) [ 27.086210] Kernel Offset: disabled [ 27.089806] Rebooting in 86400 seconds..