[....] Starting enhanced syslogd: rsyslogd[ 12.411996] audit: type=1400 audit(1515247580.927:4): avc: denied { syslog } for pid=3170 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 '10.128.0.4' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 25.542863] kasan: CONFIG_KASAN_INLINE enabled [ 25.547506] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 25.554888] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 25.561105] Dumping ftrace buffer: [ 25.564611] (ftrace buffer empty) [ 25.568287] Modules linked in: [ 25.571556] CPU: 0 PID: 3328 Comm: syzkaller174719 Not tainted 4.9.75-g06fe41f #6 [ 25.579139] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.588460] task: ffff8801c9ed9800 task.stack: ffff8801c8fc0000 [ 25.594480] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 25.602713] RSP: 0018:ffff8801c8fc79b0 EFLAGS: 00010a07 [ 25.608130] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 25.615390] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 25.622629] RBP: ffff8801c8fc79c0 R08: 0000000000000001 R09: 0000000000000000 [ 25.629874] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 25.637111] R13: 0000000000000020 R14: ffff8801c8f04200 R15: dffffc0000000000 [ 25.644349] FS: 0000000000c21880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 25.652542] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.658390] CR2: 0000000020ef0fe0 CR3: 00000001cd4c6000 CR4: 0000000000160670 [ 25.665626] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.672870] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.680106] Stack: [ 25.682224] ffff8801c9ed9800 ffff8801c8f04358 ffff8801c8fc7a20 ffffffff82666341 [ 25.690175] ffff8801c8f04370 ffffed00391e086b ffffed00391e086e ffff8801c8f04368 [ 25.698120] dead4ead00000000 ffff8801c8f04340 0000000000000000 0000000000000000 [ 25.706066] Call Trace: [ 25.708621] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 25.715077] [] sg_finish_rem_req+0x2b5/0x340 [ 25.721099] [] sg_new_read.isra.20+0x39/0x3e0 [ 25.727209] [] ? sg_get_rq_mark+0x142/0x190 [ 25.733145] [] sg_read+0x8bd/0x1440 [ 25.738392] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 25.745021] [] ? fsnotify+0xf30/0xf30 [ 25.750449] [] ? avc_policy_seqno+0x9/0x20 [ 25.756301] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 25.763367] [] ? security_file_permission+0x89/0x1e0 [ 25.770086] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 25.776720] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 25.783350] [] do_readv_writev+0x520/0x750 [ 25.789202] [] ? vfs_write+0x530/0x530 [ 25.794705] [] ? _raw_spin_unlock+0x2c/0x50 [ 25.800642] [] ? __pmd_alloc+0x410/0x410 [ 25.806322] [] ? __do_page_fault+0x5ec/0xd40 [ 25.812354] [] vfs_readv+0x84/0xc0 [ 25.817510] [] do_readv+0xe6/0x250 [ 25.822665] [] ? vfs_readv+0xc0/0xc0 [ 25.827997] [] ? entry_SYSCALL_64_fastpath+0x5/0xe2 [ 25.834631] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 25.841435] [] SyS_readv+0x27/0x30 [ 25.846591] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 25.853130] 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 [ 25.879499] RIP [] __free_pages+0x21/0x80 [ 25.885382] RSP [ 25.889149] ---[ end trace c6acae5541d81926 ]--- [ 25.893888] Kernel panic - not syncing: Fatal exception [ 25.899603] Dumping ftrace buffer: [ 25.903115] (ftrace buffer empty) [ 25.906789] Kernel Offset: disabled [ 25.910389] Rebooting in 86400 seconds..