[....] Starting enhanced syslogd: rsyslogd[ 12.501534] audit: type=1400 audit(1518667889.094:4): 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[ 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 '10.128.0.39' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 30.421136] kasan: CONFIG_KASAN_INLINE enabled [ 30.425897] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 30.433267] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.439477] Dumping ftrace buffer: [ 30.442990] (ftrace buffer empty) [ 30.446682] Modules linked in: [ 30.449963] CPU: 0 PID: 3809 Comm: syzkaller696193 Not tainted 4.9.81-gd2c57b6 #34 [ 30.457638] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.466964] task: ffff8801d84fb000 task.stack: ffff8801d8620000 [ 30.472988] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 30.481223] RSP: 0018:ffff8801d86279a0 EFLAGS: 00010a07 [ 30.486641] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266840b [ 30.493881] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 30.501123] RBP: ffff8801d86279b0 R08: 0000000000000000 R09: ffffed003a0a8a11 [ 30.508364] R10: 0000000000000005 R11: ffffed003a0a8a10 R12: 0000000000000004 [ 30.515603] R13: 0000000000000020 R14: ffff8801d8e3a100 R15: dffffc0000000000 [ 30.522846] FS: 0000000000924880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.531041] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.536893] CR2: 0000000020adff12 CR3: 00000001d927e000 CR4: 0000000000160670 [ 30.544133] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.551373] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.558612] Stack: [ 30.560731] ffffffff838b4729 ffff8801d8e3a258 ffff8801d8627a10 ffffffff82668431 [ 30.568711] ffff8801d8e3a270 ffffed003b1c744b ffffed003b1c744e ffff8801d8e3a268 [ 30.576688] dead4ead00000000 ffff8801d8e3a240 0000000000000000 0000000000000000 [ 30.584660] Call Trace: [ 30.587219] [] ? retint_kernel+0x2d/0x2d [ 30.592902] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 30.599362] [] sg_finish_rem_req+0x2b5/0x340 [ 30.605387] [] sg_read+0xa16/0x1440 [ 30.610633] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 30.617270] [] ? fsnotify+0xf30/0xf30 [ 30.622691] [] ? avc_policy_seqno+0x9/0x20 [ 30.628550] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 30.635530] [] ? security_file_permission+0x89/0x1e0 [ 30.642250] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 30.648884] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 30.655516] [] do_readv_writev+0x520/0x750 [ 30.661369] [] ? vfs_write+0x530/0x530 [ 30.666885] [] ? sg_ioctl+0x2a00/0x2a00 [ 30.672480] [] ? do_iter_readv_writev+0x400/0x400 [ 30.678946] [] ? __might_sleep+0x95/0x1a0 [ 30.684711] [] ? __inode_security_revalidate+0xd9/0x130 [ 30.691701] [] ? __fsnotify_parent+0xbc/0x340 [ 30.697813] [] ? avc_policy_seqno+0x9/0x20 [ 30.703665] [] ? fsnotify+0x86/0xf30 [ 30.708997] [] ? fsnotify+0xf30/0xf30 [ 30.714417] [] vfs_readv+0x84/0xc0 [ 30.719577] [] do_readv+0xe6/0x250 [ 30.724735] [] ? vfs_readv+0xc0/0xc0 [ 30.730070] [] ? SyS_read+0x1b0/0x1b0 [ 30.735488] [] SyS_readv+0x27/0x30 [ 30.740646] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 30.747195] [] do_syscall_64+0x1a5/0x490 [ 30.752876] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 30.759775] 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 [ 30.786453] RIP [] __free_pages+0x21/0x80 [ 30.792338] RSP [ 30.796217] ---[ end trace 1411c44e622e36d6 ]--- [ 30.800955] Kernel panic - not syncing: Fatal exception [ 30.806647] Dumping ftrace buffer: [ 30.810163] (ftrace buffer empty) [ 30.813859] Kernel Offset: disabled [ 30.817457] Rebooting in 86400 seconds..