[....] Starting enhanced syslogd: rsyslogd[ 14.662498] audit: type=1400 audit(1521781866.630:4): avc: denied { syslog } for pid=3572 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 '10.128.0.9' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 47.607373] kasan: CONFIG_KASAN_INLINE enabled [ 47.612390] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 47.619746] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 47.625947] Dumping ftrace buffer: [ 47.629457] (ftrace buffer empty) [ 47.633137] Modules linked in: [ 47.636429] CPU: 0 PID: 4402 Comm: syzkaller772840 Not tainted 4.9.89-gf361eb3 #62 [ 47.644104] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.653434] task: ffff8801d61a6000 task.stack: ffff8801d71b8000 [ 47.659458] RIP: 0010:[] [] sg_remove_scat.isra.19+0x17b/0x2d0 [ 47.668734] RSP: 0018:ffff8801d71bfad0 EFLAGS: 00010202 [ 47.674152] RAX: 1ffff1003ad1786d RBX: ffff8801d68bc358 RCX: 0000000000000001 [ 47.681394] RDX: 0000000000000008 RSI: 0000000000000000 RDI: ffff8801cfe405f4 [ 47.688635] RBP: ffff8801d71bfb20 R08: 0000000000000000 R09: ffffed003931c1d9 [ 47.695886] R10: 0000000000000005 R11: ffffed003931c1d8 R12: 0000000000000001 [ 47.703126] R13: 0000000000000008 R14: 0000000000000000 R15: dffffc0000000000 [ 47.710367] FS: 00007fe94f38b700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 47.718562] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.724418] CR2: 00007fe94f38ae78 CR3: 00000001da23a000 CR4: 0000000000160670 [ 47.731685] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.738927] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.746167] Stack: [ 47.748286] ffff8801d68bc370 ffffed003ad1786b ffffed003ad1786e ffff8801d68bc368 [ 47.756279] ffff8801cfe405d8 ffff8801d68bc340 0000000000000000 0000000000000000 [ 47.764268] 0000000000000000 ffff8801d68bc438 ffff8801d71bfb60 ffffffff8266a286 [ 47.772249] Call Trace: [ 47.774900] [] sg_finish_rem_req+0x2a6/0x320 [ 47.780925] [] sg_read+0xa22/0x1470 [ 47.786176] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 47.792812] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 47.799795] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 47.806434] [] __vfs_read+0x103/0x670 [ 47.811854] [] ? default_llseek+0x290/0x290 [ 47.817792] [] ? fsnotify+0x86/0xf30 [ 47.823122] [] ? fsnotify+0xf30/0xf30 [ 47.828544] [] ? avc_policy_seqno+0x9/0x20 [ 47.834397] [] ? selinux_file_permission+0x82/0x460 [ 47.841035] [] ? security_file_permission+0x89/0x1e0 [ 47.847759] [] ? rw_verify_area+0xe5/0x2b0 [ 47.853873] [] vfs_read+0x11e/0x380 [ 47.859813] [] SyS_read+0xd9/0x1b0 [ 47.864972] [] ? vfs_copy_file_range+0x740/0x740 [ 47.871350] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 47.878161] [] ? do_syscall_64+0x48/0x490 [ 47.883934] [] ? vfs_copy_file_range+0x740/0x740 [ 47.890308] [] do_syscall_64+0x1a4/0x490 [ 47.896000] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 47.902895] Code: 45 b8 eb 3e e8 17 1c d0 fe 48 8b 45 c8 48 c1 e8 03 42 80 3c 38 00 0f 85 3a 01 00 00 4c 8b 73 10 4b 8d 14 2e 48 89 d1 48 c1 e9 03 <42> 80 3c 39 00 0f 85 0b 01 00 00 48 8b 12 49 83 c5 08 48 85 d2 [ 47.929541] RIP [] sg_remove_scat.isra.19+0x17b/0x2d0 [ 47.936467] RSP [ 47.940518] ---[ end trace 1f8272f0e902cdde ]--- [ 47.945324] Kernel panic - not syncing: Fatal exception [ 47.951054] Dumping ftrace buffer: [ 47.954572] (ftrace buffer empty) [ 47.958250] Kernel Offset: disabled [ 47.961849] Rebooting in 86400 seconds..