[....] Starting enhanced syslogd: rsyslogd[ 15.342615] audit: type=1400 audit(1519926696.687:4): avc: denied { syslog } for pid=3652 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 '10.128.10.2' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.158783] kasan: CONFIG_KASAN_INLINE enabled [ 27.163378] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.170758] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.176963] Dumping ftrace buffer: [ 27.180495] (ftrace buffer empty) [ 27.184177] Modules linked in: [ 27.187458] CPU: 0 PID: 3808 Comm: syzkaller698992 Not tainted 4.9.85-g6e463bb #46 [ 27.195133] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.204471] task: ffff8801d8798000 task.stack: ffff8801d7d88000 [ 27.210497] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 27.218731] RSP: 0018:ffff8801d7d8f950 EFLAGS: 00010a07 [ 27.224147] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82668d9b [ 27.231388] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.238638] RBP: ffff8801d7d8f960 R08: 0000000000000001 R09: 0000000000000001 [ 27.245880] R10: 0000000000000000 R11: ffff8801d8798000 R12: 0000000000000004 [ 27.253121] R13: 0000000000000020 R14: ffff8801b21ea100 R15: dffffc0000000000 [ 27.260373] FS: 000000000070d880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.268572] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.274423] CR2: 000000000043e5b0 CR3: 00000001da2dc000 CR4: 0000000000160670 [ 27.281676] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.288916] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.296173] Stack: [ 27.298304] 0000000000000001 ffff8801b21ea258 ffff8801d7d8f9c0 ffffffff82668dc1 [ 27.306291] ffff8801b21ea270 ffffed003643d44b ffffed003643d44e ffff8801b21ea268 [ 27.314257] dead4ead00000000 ffff8801b21ea240 0000000000000000 0000000000000000 [ 27.322225] Call Trace: [ 27.324786] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.331249] [] sg_finish_rem_req+0x2b5/0x340 [ 27.337279] [] sg_new_read.isra.20+0x356/0x3e0 [ 27.343482] [] ? sg_get_rq_mark+0x121/0x190 [ 27.349443] [] sg_read+0x8b7/0x1440 [ 27.354694] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.361328] [] ? fsnotify+0xf30/0xf30 [ 27.366838] [] ? avc_policy_seqno+0x9/0x20 [ 27.372693] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 27.379676] [] ? security_file_permission+0x89/0x1e0 [ 27.386397] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.393035] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.399672] [] do_readv_writev+0x520/0x750 [ 27.405526] [] ? vfs_write+0x530/0x530 [ 27.411043] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.417939] [] ? sg_ioctl+0x2a00/0x2a00 [ 27.423535] [] ? do_iter_readv_writev+0x400/0x400 [ 27.430001] [] ? __might_sleep+0x95/0x1a0 [ 27.435772] [] ? __inode_security_revalidate+0xd9/0x130 [ 27.442757] [] ? __fsnotify_parent+0xbc/0x340 [ 27.448873] [] ? avc_policy_seqno+0x9/0x20 [ 27.454725] [] ? fsnotify+0x86/0xf30 [ 27.460058] [] ? fsnotify+0xf30/0xf30 [ 27.465477] [] vfs_readv+0x84/0xc0 [ 27.470638] [] do_readv+0xe6/0x250 [ 27.475796] [] ? vfs_readv+0xc0/0xc0 [ 27.481131] [] ? SyS_read+0x1b0/0x1b0 [ 27.486555] [] SyS_readv+0x27/0x30 [ 27.491727] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 27.498287] [] do_syscall_64+0x1a4/0x490 [ 27.503971] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.510862] 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 [ 27.537443] RIP [] __free_pages+0x21/0x80 [ 27.543330] RSP [ 27.547247] ---[ end trace 9189b6f72173b7fc ]--- [ 27.552004] Kernel panic - not syncing: Fatal exception [ 27.557710] Dumping ftrace buffer: [ 27.561221] (ftrace buffer empty) [ 27.564906] Kernel Offset: disabled [ 27.568507] Rebooting in 86400 seconds..