syzbot

KMSAN: uninit-value in kcov_openrandom: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: cc1: uninitialized urandom read (8 bytes read)
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BUG: KMSAN: uninit-value in atomic_set include/asm-generic/atomic-instrumented.h:37 [inline]
BUG: KMSAN: uninit-value in kcov_open+0x4a/0xa0 kernel/kcov.c:315
CPU: 0 PID: 4746 Comm: syz-fuzzer Not tainted 4.19.0-rc4+ #55
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x2f6/0x430 lib/dump_stack.c:113
 kmsan_report+0x183/0x2b0 mm/kmsan/kmsan.c:956
 kmsan_internal_check_memory+0x17e/0x1f0 mm/kmsan/kmsan.c:1020
 kmsan_check_memory+0xb/0x10 mm/kmsan/kmsan.c:1027
 atomic_set include/asm-generic/atomic-instrumented.h:37 [inline]
 kcov_open+0x4a/0xa0 kernel/kcov.c:315
 open_proxy_open+0x545/0x5d0 fs/debugfs/file.c:161
 do_dentry_open+0xfb0/0x18b0 fs/open.c:771
 vfs_open+0xaf/0xe0 fs/open.c:880
 do_last fs/namei.c:3418 [inline]
 path_openat+0x1845/0x6e50 fs/namei.c:3534
 do_filp_open+0x259/0x610 fs/namei.c:3564
 do_sys_open+0x630/0x940 fs/open.c:1063
 __do_sys_openat fs/open.c:1090 [inline]
 __se_sys_openat+0xcb/0xe0 fs/open.c:1084
 __x64_sys_openat+0x56/0x70 fs/open.c:1084
 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x47fcba
Code: e8 2b 41 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 4c 8b 54 24 28 4c 8b 44 24 30 4c 8b 4c 24 38 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 40 ff ff ff ff 48 c7 44 24 48
RSP: 002b:000000c420157650 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcba
RDX: 0000000000080000 RSI: 000000c420084380 RDI: ffffffffffffff9c
RBP: 000000c4201576d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000108

Local variable description: ----c.i.i.i.i@generic_permission
Variable was created at:
 generic_permission+0x4f/0xa90 fs/namei.c:335
 do_inode_permission fs/namei.c:393 [inline]
 inode_permission+0x11b/0x940 fs/namei.c:451

Byte 7 of 8 is uninitialized
Memory access starts at ffff8801adcbf810
==================================================================