[....] Starting enhanced syslogd: rsyslogd[ 13.409675] audit: type=1400 audit(1519495371.638:4): avc: denied { syslog } for pid=3644 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 '10.128.0.35' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.407854] kasan: CONFIG_KASAN_INLINE enabled [ 27.412464] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.419794] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.426008] Dumping ftrace buffer: [ 27.429514] (ftrace buffer empty) [ 27.433193] Modules linked in: [ 27.436476] CPU: 0 PID: 3802 Comm: syzkaller291327 Not tainted 4.9.83-ga92bb8d #43 [ 27.444148] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.453475] task: ffff8801d8311800 task.stack: ffff8801d8338000 [ 27.459496] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 27.467727] RSP: 0018:ffff8801d833fa60 EFLAGS: 00010a07 [ 27.473144] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826687fb [ 27.480383] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.487622] RBP: ffff8801d833fa70 R08: 0000000000000001 R09: 0000000000000001 [ 27.494870] R10: 0000000000000000 R11: ffff8801d8311800 R12: 0000000000000004 [ 27.502110] R13: 0000000000000020 R14: ffff8801d7dd0000 R15: dffffc0000000000 [ 27.509351] FS: 00000000013b5880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.517543] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.523399] CR2: 00000000205c5fc7 CR3: 00000001da3fc000 CR4: 0000000000160670 [ 27.530641] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.537879] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.545115] Stack: [ 27.547235] ffffffff838b57e9 ffff8801d7dd0158 ffff8801d833fad0 ffffffff82668821 [ 27.555217] ffff8801d7dd0170 ffffed003afba02b ffffed003afba02e ffff8801d7dd0168 [ 27.563190] dead4ead00000000 ffff8801d7dd0140 0000000000000000 0000000000000000 [ 27.571165] Call Trace: [ 27.573720] [] ? retint_kernel+0x2d/0x2d [ 27.579402] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.585860] [] sg_finish_rem_req+0x2b5/0x340 [ 27.591886] [] sg_new_read.isra.20+0x356/0x3e0 [ 27.598086] [] ? sg_get_rq_mark+0x17d/0x190 [ 27.604025] [] sg_read+0x8b7/0x1440 [ 27.609271] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.615911] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 27.622978] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.629611] [] __vfs_read+0x103/0x670 [ 27.635028] [] ? default_llseek+0x290/0x290 [ 27.640967] [] ? fsnotify+0x86/0xf30 [ 27.646297] [] ? fsnotify+0xf30/0xf30 [ 27.651717] [] ? avc_policy_seqno+0x9/0x20 [ 27.657567] [] ? selinux_file_permission+0x82/0x460 [ 27.664202] [] ? security_file_permission+0x89/0x1e0 [ 27.670926] [] ? rw_verify_area+0xe5/0x2b0 [ 27.676781] [] vfs_read+0x11e/0x380 [ 27.682027] [] SyS_read+0xd9/0x1b0 [ 27.687185] [] ? vfs_copy_file_range+0x740/0x740 [ 27.693566] [] ? do_syscall_64+0x48/0x490 [ 27.699332] [] ? vfs_copy_file_range+0x740/0x740 [ 27.705719] [] do_syscall_64+0x1a4/0x490 [ 27.711401] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 27.718292] 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 [ 27.744895] RIP [] __free_pages+0x21/0x80 [ 27.750778] RSP [ 27.754849] ---[ end trace 4616c84f1da8ad83 ]--- [ 27.759600] Kernel panic - not syncing: Fatal exception [ 27.765389] Dumping ftrace buffer: [ 27.768899] (ftrace buffer empty) [ 27.772577] Kernel Offset: disabled [ 27.776173] Rebooting in 86400 seconds..