[....] Starting enhanced syslogd: rsyslogd[ 12.678719] audit: type=1400 audit(1514953792.762:4): avc: denied { syslog } for pid=3174 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 '10.128.0.59' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 20.276707] kasan: CONFIG_KASAN_INLINE enabled [ 20.281294] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 20.288643] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 20.294848] Dumping ftrace buffer: [ 20.299219] (ftrace buffer empty) [ 20.302892] Modules linked in: [ 20.306158] CPU: 1 PID: 3323 Comm: syzkaller123360 Not tainted 4.9.74-g9e5dd8e #12 [ 20.313826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.323144] task: ffff8801cb3d0000 task.stack: ffff8801c8340000 [ 20.329166] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 20.337389] RSP: 0018:ffff8801c8347aa0 EFLAGS: 00010a07 [ 20.342802] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826649fb [ 20.350038] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 20.357272] RBP: ffff8801c8347ab0 R08: ffffed0039258e04 R09: ffff8801c92c7000 [ 20.364897] R10: 0000000000000005 R11: ffffed0039258e04 R12: 0000000000000004 [ 20.372652] R13: 0000000000000020 R14: ffff8801c7830000 R15: dffffc0000000000 [ 20.379888] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009b54840 [ 20.389991] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 20.397156] CR2: 0000000020ef7fa5 CR3: 00000001cb9e7000 CR4: 00000000001606e0 [ 20.404394] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.411631] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.418866] Stack: [ 20.420985] 0000000000000000 ffff8801c7830158 ffff8801c8347b10 ffffffff82664a21 [ 20.428927] ffff8801c7830170 ffffed0038f0602b ffffed0038f0602e ffff8801c7830168 [ 20.436869] dead4ead00000000 ffff8801c7830140 0000000000000000 0000000000000000 [ 20.444816] Call Trace: [ 20.447370] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 20.453826] [] sg_finish_rem_req+0x2b5/0x340 [ 20.459846] [] sg_read+0xa1c/0x1440 [ 20.465088] [] ? __lock_is_held+0xa1/0xf0 [ 20.470848] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.477481] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.484112] [] __vfs_read+0x103/0x670 [ 20.489524] [] ? default_llseek+0x290/0x290 [ 20.495460] [] ? fsnotify+0x86/0xf30 [ 20.500786] [] ? fsnotify+0xf30/0xf30 [ 20.506199] [] ? avc_policy_seqno+0x9/0x20 [ 20.512048] [] ? selinux_file_permission+0x82/0x460 [ 20.518678] [] ? security_file_permission+0x89/0x1e0 [ 20.525393] [] ? rw_verify_area+0xe5/0x2b0 [ 20.531239] [] vfs_read+0x11e/0x380 [ 20.536484] [] SyS_read+0xd9/0x1b0 [ 20.541637] [] ? vfs_copy_file_range+0x740/0x740 [ 20.548006] [] ? do_fast_syscall_32+0xcf/0x890 [ 20.554200] [] ? vfs_copy_file_range+0x740/0x740 [ 20.560571] [] do_fast_syscall_32+0x2f7/0x890 [ 20.566678] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.573315] [] entry_SYSENTER_compat+0x51/0x60 [ 20.579507] 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 [ 20.605751] RIP [] __free_pages+0x21/0x80 [ 20.611623] RSP [ 20.615421] ---[ end trace 9e92fd83e16c4b78 ]--- [ 20.620151] Kernel panic - not syncing: Fatal exception [ 20.626457] Dumping ftrace buffer: [ 20.630310] (ftrace buffer empty) [ 20.633986] Kernel Offset: disabled [ 20.637577] Rebooting in 86400 seconds..