[....] Starting enhanced syslogd: rsyslogd[ 11.617480] audit: type=1400 audit(1521902515.238:4): avc: denied { syslog } for pid=3517 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 '10.128.0.19' (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 syzkaller login: [ 25.742568] kasan: CONFIG_KASAN_INLINE enabled [ 25.743385] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 25.744393] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 25.745318] Dumping ftrace buffer: [ 25.745989] (ftrace buffer empty) [ 25.746580] Modules linked in: [ 25.747104] CPU: 1 PID: 3678 Comm: syzkaller403266 Not tainted 4.9.89-ge34e318 #64 [ 25.748133] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.749408] task: ffff8801c2361800 task.stack: ffff8801bed48000 [ 25.750224] RIP: 0010:[] [] sg_remove_scat.isra.19+0x17b/0x2d0 [ 25.751488] RSP: 0018:ffff8801bed4fad0 EFLAGS: 00010202 [ 25.752249] RAX: 1ffff1003a82f44d RBX: ffff8801d417a258 RCX: 0000000000000002 [ 25.753351] RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff8801d417801c [ 25.754340] RBP: ffff8801bed4fb20 R08: 0000000000000000 R09: ffffed003a798191 [ 25.755348] R10: 0000000000000005 R11: ffffed003a798190 R12: 0000000000000002 [ 25.756354] R13: 0000000000000010 R14: 0000000000000000 R15: dffffc0000000000 [ 25.757402] FS: 00007f5bf8beb700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 25.758605] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.759502] CR2: 0000561771903460 CR3: 00000001c55ac000 CR4: 0000000000160670 [ 25.760482] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.761540] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.762623] Stack: [ 25.764639] ffff8801d417a270 ffffed003a82f44b ffffed003a82f44e ffff8801d417a268 [ 25.772605] ffff8801d4178000 ffff8801d417a240 0000000000000000 0000000000000000 [ 25.780578] 0000000000000000 ffff8801d417a338 ffff8801bed4fb60 ffffffff826678a6 [ 25.788548] Call Trace: [ 25.791115] [] sg_finish_rem_req+0x2a6/0x320 [ 25.797162] [] sg_read+0xa22/0x1470 [ 25.802409] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 25.809044] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 25.816434] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 25.823074] [] __vfs_read+0x103/0x670 [ 25.828493] [] ? default_llseek+0x290/0x290 [ 25.834432] [] ? fsnotify+0x86/0xf30 [ 25.839762] [] ? fsnotify+0xf30/0xf30 [ 25.845182] [] ? avc_policy_seqno+0x9/0x20 [ 25.851055] [] ? selinux_file_permission+0x82/0x460 [ 25.857706] [] ? security_file_permission+0x89/0x1e0 [ 25.864433] [] ? rw_verify_area+0xe5/0x2b0 [ 25.870291] [] vfs_read+0x11e/0x380 [ 25.875550] [] SyS_read+0xd9/0x1b0 [ 25.880712] [] ? vfs_copy_file_range+0x740/0x740 [ 25.887095] [] ? do_syscall_64+0x48/0x490 [ 25.892865] [] ? vfs_copy_file_range+0x740/0x740 [ 25.899253] [] do_syscall_64+0x1a4/0x490 [ 25.904942] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.911842] Code: 45 b8 eb 3e e8 97 1b 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 [ 25.938470] RIP [] sg_remove_scat.isra.19+0x17b/0x2d0 [ 25.945395] RSP [ 25.951355] ---[ end trace 80749ec2701d6a4d ]--- [ 25.956113] Kernel panic - not syncing: Fatal exception [ 25.961884] Dumping ftrace buffer: [ 25.965394] (ftrace buffer empty) [ 25.969076] Kernel Offset: disabled [ 25.972674] Rebooting in 86400 seconds..