. [ 32.279405] audit: type=1800 audit(1562193863.254:34): pid=6880 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 36.136449] random: sshd: uninitialized urandom read (32 bytes read) [ 36.503406] audit: type=1400 audit(1562193867.504:35): avc: denied { map } for pid=7052 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 36.554601] random: sshd: uninitialized urandom read (32 bytes read) [ 37.100405] random: sshd: uninitialized urandom read (32 bytes read) [ 46.058101] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.1.46' (ECDSA) to the list of known hosts. [ 51.616117] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 51.745653] audit: type=1400 audit(1562193882.744:36): avc: denied { map } for pid=7064 comm="syz-executor539" path="/root/syz-executor539991880" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 51.755924] ------------[ cut here ]------------ [ 51.777448] WARNING: CPU: 0 PID: 7064 at fs/overlayfs/dir.c:523 ovl_create_or_link+0x6c9/0x11e0 [ 51.780647] audit: type=1804 audit(1562193882.744:37): pid=7064 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor539" name="/root/file0/file0" dev="sda1" ino=16487 res=1 [ 51.786340] Kernel panic - not syncing: panic_on_warn set ... [ 51.786340] [ 51.817677] CPU: 0 PID: 7064 Comm: syz-executor539 Not tainted 4.14.132 #26 [ 51.824783] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.834150] Call Trace: [ 51.836969] dump_stack+0x138/0x19c [ 51.840689] panic+0x1f2/0x426 [ 51.843899] ? add_taint.cold+0x16/0x16 [ 51.848218] ? ovl_create_or_link+0x6c9/0x11e0 [ 51.852791] ? ovl_create_or_link+0x6c9/0x11e0 [ 51.857536] __warn.cold+0x2f/0x36 [ 51.861078] ? ist_end_non_atomic+0x10/0x10 [ 51.865414] ? ovl_create_or_link+0x6c9/0x11e0 [ 51.870050] report_bug+0x216/0x254 [ 51.873944] do_error_trap+0x1bb/0x310 [ 51.877851] ? math_error+0x360/0x360 [ 51.881705] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.886581] do_invalid_op+0x1b/0x20 [ 51.890391] invalid_op+0x1b/0x40 [ 51.894030] RIP: 0010:ovl_create_or_link+0x6c9/0x11e0 [ 51.899307] RSP: 0018:ffff8880853ffbc0 EFLAGS: 00010297 [ 51.904926] RAX: ffff8880966be2c0 RBX: ffff88809a2ec530 RCX: 1ffff110134610ef [ 51.912479] RDX: 0000000000000000 RSI: ffff88809a311544 RDI: ffff88809a2ec538 [ 51.919758] RBP: ffff8880853ffd30 R08: ffff8880966be2c0 R09: ffff8880966bec00 [ 51.927177] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 51.934659] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88809a311540 [ 51.942195] ? ovl_unlink+0x20/0x20 [ 51.945822] ? selinux_is_enabled+0x9/0x50 [ 51.950045] ? creds_are_invalid+0x48/0x110 [ 51.954524] ? selinux_is_enabled+0x9/0x50 [ 51.958860] ? creds_are_invalid+0x48/0x110 [ 51.963683] ? mutex_lock_interruptible_nested+0x16/0x20 [ 51.969137] ? mutex_lock_interruptible_nested+0x16/0x20 [ 51.974614] ? ovl_nlink_start+0x2c3/0x470 [ 51.978866] ovl_link+0x157/0x1a1 [ 51.982325] ? ovl_create+0x30/0x30 [ 51.985972] vfs_link+0x6bd/0xa50 [ 51.989421] SyS_link+0x329/0x500 [ 51.993049] ? SyS_linkat+0x5b0/0x5b0 [ 51.996873] ? do_syscall_64+0x53/0x640 [ 52.000872] ? SyS_linkat+0x5b0/0x5b0 [ 52.004910] do_syscall_64+0x1e8/0x640 [ 52.008804] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.013699] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 52.019006] RIP: 0033:0x440309 [ 52.022420] RSP: 002b:00007ffcf378b268 EFLAGS: 00000246 ORIG_RAX: 0000000000000056 [ 52.030271] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440309 [ 52.037905] RDX: 0000000000440309 RSI: 0000000020000040 RDI: 0000000020000140 [ 52.045726] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 52.053450] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401b90 [ 52.060745] R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000 [ 52.069792] Kernel Offset: disabled [ 52.073648] Rebooting in 86400 seconds..