[....] Starting enhanced syslogd: rsyslogd[ 9.522520] audit: type=1400 audit(1517053465.990:4): avc: denied { syslog } for pid=3169 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 32.626229] kasan: CONFIG_KASAN_INLINE enabled [ 32.626983] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 32.628018] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.628878] Dumping ftrace buffer: [ 32.631707] (ftrace buffer empty) [ 32.632208] Modules linked in: [ 32.632707] CPU: 1 PID: 3339 Comm: syzkaller667922 Not tainted 4.9.78-g68d447c #23 [ 32.633719] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.635085] task: ffff8801cae98000 task.stack: ffff8801c80b0000 [ 32.635951] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 32.637087] RSP: 0018:ffff8801c80b7ab0 EFLAGS: 00010a07 [ 32.637828] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826676fb [ 32.638833] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 32.639818] RBP: ffff8801c80b7ac0 R08: 0000000000000001 R09: 0000000000000001 [ 32.640775] R10: 0000000000000000 R11: ffff8801cae98000 R12: 0000000000000004 [ 32.641770] R13: 0000000000000020 R14: ffff8801c8d82100 R15: dffffc0000000000 [ 32.642769] FS: 000000000101e880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.643847] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.644624] CR2: 0000000020a2f000 CR3: 00000001c95c4000 CR4: 0000000000160670 [ 32.645580] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.647709] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.654952] Stack: [ 32.657074] 0000000000000001 ffff8801c8d82258 ffff8801c80b7b20 ffffffff82667721 [ 32.665038] ffff8801c8d82270 ffffed00391b044b ffffed00391b044e ffff8801c8d82268 [ 32.673102] dead4ead00000000 ffff8801c8d82240 0000000000000000 0000000000000000 [ 32.681068] Call Trace: [ 32.683628] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 32.690089] [] sg_finish_rem_req+0x2b5/0x340 [ 32.696114] [] sg_new_read.isra.20+0x356/0x3e0 [ 32.702323] [] ? sg_get_rq_mark+0x170/0x190 [ 32.708283] [] sg_read+0x8b7/0x1440 [ 32.713534] [] ? __lru_cache_add+0x187/0x250 [ 32.719566] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 32.726204] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.732157] [] ? do_huge_pmd_anonymous_page+0x2d4/0x10d0 [ 32.739226] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 32.745866] [] __vfs_read+0x103/0x670 [ 32.751289] [] ? default_llseek+0x290/0x290 [ 32.757230] [] ? fsnotify+0x86/0xf30 [ 32.762579] [] ? fsnotify+0xf30/0xf30 [ 32.768003] [] ? avc_policy_seqno+0x9/0x20 [ 32.773872] [] ? selinux_file_permission+0x82/0x460 [ 32.780516] [] ? security_file_permission+0x89/0x1e0 [ 32.787244] [] ? rw_verify_area+0xe5/0x2b0 [ 32.793099] [] vfs_read+0x11e/0x380 [ 32.798348] [] SyS_read+0xd9/0x1b0 [ 32.803509] [] ? vfs_copy_file_range+0x740/0x740 [ 32.809885] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 32.816698] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.823249] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 32.829796] 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 [ 32.856337] RIP [] __free_pages+0x21/0x80 [ 32.862226] RSP [ 32.866149] ---[ end trace d3ee3c28e5ad5326 ]--- [ 32.870926] Kernel panic - not syncing: Fatal exception [ 32.876673] Dumping ftrace buffer: [ 32.880186] (ftrace buffer empty) [ 32.883868] Kernel Offset: disabled [ 32.887476] Rebooting in 86400 seconds..