[....] Starting enhanced syslogd: rsyslogd[ 13.751385] audit: type=1400 audit(1519647945.861:4): avc: denied { syslog } for pid=3651 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] 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 '10.128.0.25' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 29.032360] kasan: CONFIG_KASAN_INLINE enabled [ 29.037079] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 29.044419] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.050620] Dumping ftrace buffer: [ 29.054137] (ftrace buffer empty) [ 29.057817] Modules linked in: [ 29.061100] CPU: 0 PID: 3809 Comm: syzkaller391239 Not tainted 4.9.84-ga9d0273 #44 [ 29.068774] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.078113] task: ffff8801d82d8000 task.stack: ffff8801da1b0000 [ 29.084138] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 29.092374] RSP: 0018:ffff8801da1b7950 EFLAGS: 00010a07 [ 29.097794] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82668dfb [ 29.105036] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 29.112279] RBP: ffff8801da1b7960 R08: 0000000000000001 R09: 0000000000000000 [ 29.119520] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 29.126769] R13: 0000000000000020 R14: ffff8801d7de8000 R15: dffffc0000000000 [ 29.134012] FS: 000000000121c880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.142211] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.148063] CR2: 0000000020ef0fe0 CR3: 00000001b4830000 CR4: 0000000000160670 [ 29.155305] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.162553] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.169792] Stack: [ 29.171916] ffff8801d82d8000 ffff8801d7de8158 ffff8801da1b79c0 ffffffff82668e21 [ 29.179993] ffff8801d7de8170 ffffed003afbd02b ffffed003afbd02e ffff8801d7de8168 [ 29.187973] dead4ead00000000 ffff8801d7de8140 0000000000000000 0000000000000000 [ 29.195950] Call Trace: [ 29.198512] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 29.204977] [] sg_finish_rem_req+0x2b5/0x340 [ 29.211010] [] sg_new_read.isra.20+0x39/0x3e0 [ 29.217125] [] ? sg_get_rq_mark+0x142/0x190 [ 29.223069] [] sg_read+0x8b7/0x1440 [ 29.228315] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 29.234955] [] ? fsnotify+0xf30/0xf30 [ 29.240379] [] ? avc_policy_seqno+0x9/0x20 [ 29.246247] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 29.253229] [] ? security_file_permission+0x89/0x1e0 [ 29.259952] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 29.266591] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 29.273229] [] do_readv_writev+0x520/0x750 [ 29.279086] [] ? vfs_write+0x530/0x530 [ 29.284597] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 29.291499] [] ? sg_ioctl+0x2a00/0x2a00 [ 29.297095] [] ? do_iter_readv_writev+0x400/0x400 [ 29.303559] [] ? __might_sleep+0x95/0x1a0 [ 29.309343] [] ? __inode_security_revalidate+0xd9/0x130 [ 29.316328] [] ? __fsnotify_parent+0xbc/0x340 [ 29.322447] [] ? avc_policy_seqno+0x9/0x20 [ 29.328312] [] ? fsnotify+0x86/0xf30 [ 29.333648] [] ? fsnotify+0xf30/0xf30 [ 29.339073] [] vfs_readv+0x84/0xc0 [ 29.344236] [] do_readv+0xe6/0x250 [ 29.349399] [] ? vfs_readv+0xc0/0xc0 [ 29.354737] [] ? SyS_read+0x1b0/0x1b0 [ 29.360173] [] SyS_readv+0x27/0x30 [ 29.365335] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 29.371888] [] do_syscall_64+0x1a4/0x490 [ 29.377571] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 29.384466] 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 [ 29.411133] RIP [] __free_pages+0x21/0x80 [ 29.417023] RSP [ 29.420919] ---[ end trace a9f8b24e6c589c9b ]--- [ 29.425947] Kernel panic - not syncing: Fatal exception [ 29.431721] Dumping ftrace buffer: [ 29.435236] (ftrace buffer empty) [ 29.438918] Kernel Offset: disabled [ 29.442519] Rebooting in 86400 seconds..