random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
------------[ cut here ]------------
kernel BUG at fs/userfaultfd.c:883!
invalid opcode: 0000 [#1] SMP PTI
CPU: 1 PID: 4550 Comm: syz-executor521 Not tainted 4.18.0-rc5+ #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:userfaultfd_release+0x8a7/0xc30 fs/userfaultfd.c:880
Code: ff 89 c0 48 89 c1 48 c1 e1 20 48 09 c1 49 89 0c 24 e9 9d fe ff ff 8b 7d a8 e8 65 24 d2 ff e9 af fe ff ff e8 db 6f 76 ff eb 27 <0f> 0b 0f 1f 80 00 00 00 00 eb fe 49 89 f5 44 89 ff e8 43 24 d2 ff 
RSP: 0018:ffff8801bbb7fab8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8801ac62b300 RCX: 0000000000000000
RDX: 00000000ffffff00 RSI: 0000000000000000 RDI: ffffea0009769b60
RBP: ffff8801bbb7fbe0 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff81f1ac80 R12: 0000000000100273
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000001430880(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1f7cc5ce78 CR3: 00000001a815e000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __fput+0x458/0xa30 fs/file_table.c:209
 ____fput+0x37/0x40 fs/file_table.c:243
 task_work_run+0x22e/0x2b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:192 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:166 [inline]
 prepare_exit_to_usermode+0x35d/0x430 arch/x86/entry/common.c:197
 syscall_return_slowpath+0x108/0x800 arch/x86/entry/common.c:268
 do_syscall_64+0x1ad/0x230 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x405471
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 54 17 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 
RSP: 002b:00007ffd968decc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000405471
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffd968decd0 R11: 0000000000000293 R12: 00000000006dbc3c
R13: 00000000006dbda0 R14: 0000000000000008 R15: 0000000000000001
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 6d110da0ecb68d29 ]---
RIP: 0010:userfaultfd_release+0x8a7/0xc30 fs/userfaultfd.c:880
Code: ff 89 c0 48 89 c1 48 c1 e1 20 48 09 c1 49 89 0c 24 e9 9d fe ff ff 8b 7d a8 e8 65 24 d2 ff e9 af fe ff ff e8 db 6f 76 ff eb 27 <0f> 0b 0f 1f 80 00 00 00 00 eb fe 49 89 f5 44 89 ff e8 43 24 d2 ff 
RSP: 0018:ffff8801bbb7fab8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8801ac62b300 RCX: 0000000000000000
RDX: 00000000ffffff00 RSI: 0000000000000000 RDI: ffffea0009769b60
RBP: ffff8801bbb7fbe0 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff81f1ac80 R12: 0000000000100273
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000001430880(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1f7cc5ce78 CR3: 00000001a815e000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400