[....] Starting enhanced syslogd: rsyslogd[ 13.014322] audit: type=1400 audit(1519753050.701:4): 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 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 '10.128.0.61' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.050910] kasan: CONFIG_KASAN_INLINE enabled [ 26.055556] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.062899] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.069124] Dumping ftrace buffer: [ 26.072635] (ftrace buffer empty) [ 26.076320] Modules linked in: [ 26.079601] CPU: 1 PID: 3807 Comm: syzkaller535248 Not tainted 4.9.84-ge7f51a5 #45 [ 26.087272] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.096598] task: ffff8801b464e000 task.stack: ffff8801afd90000 [ 26.102622] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 26.110856] RSP: 0018:ffff8801afd97a60 EFLAGS: 00010a07 [ 26.116277] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82668dfb [ 26.123530] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 26.130771] RBP: ffff8801afd97a70 R08: 0000000000000001 R09: 0000000000000001 [ 26.138483] R10: 0000000000000000 R11: ffff8801b464e000 R12: 0000000000000004 [ 26.145727] R13: 0000000000000020 R14: ffff8801d99e4200 R15: dffffc0000000000 [ 26.152971] FS: 000000000265b880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.161169] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.167020] CR2: 0000000020000080 CR3: 00000001da368000 CR4: 0000000000160670 [ 26.174264] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.181507] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.188746] Stack: [ 26.190867] ffffffff838b5d69 ffff8801d99e4358 ffff8801afd97ad0 ffffffff82668e21 [ 26.198836] ffff8801d99e4370 ffffed003b33c86b ffffed003b33c86e ffff8801d99e4368 [ 26.206808] dead4ead00000000 ffff8801d99e4340 0000000000000000 0000000000000000 [ 26.214774] Call Trace: [ 26.217334] [] ? retint_kernel+0x2d/0x2d [ 26.223029] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 26.229499] [] sg_finish_rem_req+0x2b5/0x340 [ 26.235526] [] sg_new_read.isra.20+0x356/0x3e0 [ 26.241725] [] ? sg_get_rq_mark+0x182/0x190 [ 26.247665] [] sg_read+0x8b7/0x1440 [ 26.252911] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 26.259560] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 26.266632] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 26.273268] [] __vfs_read+0x103/0x670 [ 26.278686] [] ? default_llseek+0x290/0x290 [ 26.284627] [] ? fsnotify+0x86/0xf30 [ 26.289961] [] ? fsnotify+0xf30/0xf30 [ 26.295383] [] ? avc_policy_seqno+0x9/0x20 [ 26.301238] [] ? selinux_file_permission+0x82/0x460 [ 26.307873] [] ? security_file_permission+0x89/0x1e0 [ 26.314593] [] ? rw_verify_area+0xe5/0x2b0 [ 26.320449] [] vfs_read+0x11e/0x380 [ 26.325700] [] SyS_read+0xd9/0x1b0 [ 26.330860] [] ? vfs_copy_file_range+0x740/0x740 [ 26.337237] [] ? do_syscall_64+0x48/0x490 [ 26.343005] [] ? vfs_copy_file_range+0x740/0x740 [ 26.349379] [] do_syscall_64+0x1a4/0x490 [ 26.355063] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 26.361954] 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 [ 26.388551] RIP [] __free_pages+0x21/0x80 [ 26.394442] RSP [ 26.398423] ---[ end trace f2ba1624e9bf4437 ]--- [ 26.403161] Kernel panic - not syncing: Fatal exception [ 26.408862] Dumping ftrace buffer: [ 26.412381] (ftrace buffer empty) [ 26.416061] Kernel Offset: disabled [ 26.419660] Rebooting in 86400 seconds..