[....] Starting enhanced syslogd: rsyslogd[ 13.147678] audit: type=1400 audit(1519837542.855:4): 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.50' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 40.025050] kasan: CONFIG_KASAN_INLINE enabled [ 40.029671] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 40.037059] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 40.043270] Dumping ftrace buffer: [ 40.046784] (ftrace buffer empty) [ 40.050489] Modules linked in: [ 40.053777] CPU: 1 PID: 3815 Comm: syzkaller663147 Not tainted 4.9.85-g6e463bb #46 [ 40.061455] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.070787] task: ffff8801d7733000 task.stack: ffff8801d77e8000 [ 40.076814] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 40.085056] RSP: 0018:ffff8801d77ef950 EFLAGS: 00010a07 [ 40.090477] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82668d9b [ 40.097720] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 40.104960] RBP: ffff8801d77ef960 R08: 0000000000000001 R09: 0000000000000001 [ 40.112213] R10: 0000000000000000 R11: ffff8801d7733000 R12: 0000000000000004 [ 40.119466] R13: 0000000000000020 R14: ffff8801b1b7a100 R15: dffffc0000000000 [ 40.126709] FS: 0000000001eab880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 40.134907] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.140771] CR2: 000000000043e610 CR3: 00000001d9800000 CR4: 0000000000160670 [ 40.148027] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.155271] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.162510] Stack: [ 40.164633] 0000000000000001 ffff8801b1b7a258 ffff8801d77ef9c0 ffffffff82668dc1 [ 40.173059] ffff8801b1b7a270 ffffed003636f44b ffffed003636f44e ffff8801b1b7a268 [ 40.181036] dead4ead00000000 ffff8801b1b7a240 0000000000000000 0000000000000000 [ 40.189017] Call Trace: [ 40.191581] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 40.198044] [] sg_finish_rem_req+0x2b5/0x340 [ 40.204074] [] sg_new_read.isra.20+0x356/0x3e0 [ 40.210278] [] ? sg_get_rq_mark+0x130/0x190 [ 40.216219] [] sg_read+0x8b7/0x1440 [ 40.221468] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 40.228104] [] ? fsnotify+0xf30/0xf30 [ 40.233539] [] ? avc_policy_seqno+0x9/0x20 [ 40.239398] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 40.246383] [] ? security_file_permission+0x89/0x1e0 [ 40.253107] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 40.259744] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 40.266382] [] do_readv_writev+0x520/0x750 [ 40.272240] [] ? vfs_write+0x530/0x530 [ 40.277749] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 40.284649] [] ? sg_ioctl+0x2a00/0x2a00 [ 40.290247] [] ? do_iter_readv_writev+0x400/0x400 [ 40.296711] [] ? __might_sleep+0x95/0x1a0 [ 40.302480] [] ? __fsnotify_parent+0xbc/0x340 [ 40.308598] [] ? avc_policy_seqno+0x9/0x20 [ 40.314453] [] ? fsnotify+0x86/0xf30 [ 40.319880] [] ? fsnotify+0xf30/0xf30 [ 40.325300] [] vfs_readv+0x84/0xc0 [ 40.330469] [] do_readv+0xe6/0x250 [ 40.335632] [] ? vfs_readv+0xc0/0xc0 [ 40.340966] [] ? SyS_read+0x1b0/0x1b0 [ 40.346386] [] SyS_readv+0x27/0x30 [ 40.351546] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 40.358109] [] do_syscall_64+0x1a4/0x490 [ 40.363791] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 40.370684] 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 [ 40.397419] RIP [] __free_pages+0x21/0x80 [ 40.403311] RSP [ 40.407154] ---[ end trace f7fb02660242ecc3 ]--- [ 40.411894] Kernel panic - not syncing: Fatal exception [ 40.417644] Dumping ftrace buffer: [ 40.421265] (ftrace buffer empty) [ 40.424953] Kernel Offset: disabled [ 40.428559] Rebooting in 86400 seconds..