[....] Starting enhanced syslogd: rsyslogd[ 14.797886] audit: type=1400 audit(1520391712.134:4): avc: denied { syslog } for pid=3647 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 '10.128.10.2' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.921480] kasan: CONFIG_KASAN_INLINE enabled [ 26.926179] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.933533] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.939743] Dumping ftrace buffer: [ 26.943250] (ftrace buffer empty) [ 26.946929] Modules linked in: [ 26.950207] CPU: 0 PID: 3805 Comm: syzkaller323989 Not tainted 4.9.86-gb324a70 #50 [ 26.957880] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.967202] task: ffff8801d8e88000 task.stack: ffff8801b18a8000 [ 26.973224] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 26.981452] RSP: 0018:ffff8801b18af940 EFLAGS: 00010a07 [ 26.986869] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82668edb [ 26.994107] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 27.001344] RBP: ffff8801b18af950 R08: 0000000048000000 R09: 0000000000001e30 [ 27.008587] R10: 0000000000002100 R11: ffff8801d8e88000 R12: 0000000000000004 [ 27.015827] R13: 0000000000000020 R14: ffff8801d7b28000 R15: dffffc0000000000 [ 27.023065] FS: 00007f0228725700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.031256] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.037121] CR2: 0000000020e94000 CR3: 00000001da322000 CR4: 0000000000160670 [ 27.044362] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.051599] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.058842] Stack: [ 27.060962] 0000000000000001 ffff8801d7b28158 ffff8801b18af9b0 ffffffff82668f01 [ 27.068934] ffff8801d7b28170 ffffed003af6502b ffffed003af6502e ffff8801d7b28168 [ 27.076893] dead4ead00000000 ffff8801d7b28140 0000000000000000 0000000000000000 [ 27.084850] Call Trace: [ 27.087409] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 27.093876] [] sg_finish_rem_req+0x2b5/0x340 [ 27.099901] [] sg_new_read.isra.20+0x18d/0x3e0 [ 27.106101] [] sg_read+0x8b7/0x1440 [ 27.111343] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 27.117982] [] ? fsnotify+0x86/0xf30 [ 27.123312] [] ? fsnotify+0xf30/0xf30 [ 27.128730] [] ? avc_policy_seqno+0x9/0x20 [ 27.134585] [] do_loop_readv_writev.part.17+0xc8/0x2b0 [ 27.141478] [] do_readv_writev+0x5fd/0x740 [ 27.147328] [] ? vfs_write+0x530/0x530 [ 27.152834] [] ? check_preemption_disabled+0x3b/0x200 [ 27.159639] [] ? __fget+0x20a/0x3b0 [ 27.164880] [] ? __fget+0x231/0x3b0 [ 27.170127] [] ? __fget+0x47/0x3b0 [ 27.175287] [] vfs_readv+0x84/0xc0 [ 27.180443] [] do_readv+0xe6/0x250 [ 27.185601] [] ? vfs_readv+0xc0/0xc0 [ 27.190936] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 27.197230] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.204044] [] SyS_readv+0x27/0x30 [ 27.209556] [] ? rw_copy_check_uvector+0x2c0/0x2c0 [ 27.216106] [] do_syscall_64+0x1a4/0x490 [ 27.221793] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.228685] 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 [ 27.255185] RIP [] __free_pages+0x21/0x80 [ 27.261084] RSP [ 27.264977] ---[ end trace 799d3ef7bba4f109 ]--- [ 27.269720] Kernel panic - not syncing: Fatal exception [ 27.275462] Dumping ftrace buffer: [ 27.278985] (ftrace buffer empty) [ 27.282663] Kernel Offset: disabled [ 27.286255] Rebooting in 86400 seconds..