KMSAN: uninit-value in p9_client

KMSAN: uninit-value in p9_client_rpc
Status: upstream: reported C repro on 2018/07/10 18:41
Reported-by: syzbot+4de40388f584432bf004@syzkaller.appspotmail.com
First crash: 970d, last: 968d

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2020/10/31 23:50	15m	anant.thazhemadam@gmail.com		https://github.com/google/kmsan.git master	log
2020/09/20 16:35	14m	anant.thazhemadam@gmail.com		https://github.com/google/kmsan.git master	report log

Sample crash report:

FS-Cache: O-key=[10] '34323934373135343132'
FS-Cache: N-cookie c=(____ptrval____) [p=(____ptrval____) fl=2 nc=0 na=1]
FS-Cache: N-cookie d=(____ptrval____) n=(____ptrval____)
FS-Cache: N-key=[10] '34323934373135343132'
==================================================================
BUG: KMSAN: uninit-value in p9_client_rpc+0x194c/0x1dc0 net/9p/client.c:818
CPU: 1 PID: 4620 Comm: syz-executor262 Not tainted 4.18.0-rc4+ #24
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+0x185/0x1e0 lib/dump_stack.c:113
 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:1092
 __msan_warning_32+0x7d/0xe0 mm/kmsan/kmsan_instr.c:640
 p9_client_rpc+0x194c/0x1dc0 net/9p/client.c:818
 p9_client_attach+0x35b/0xc30 net/9p/client.c:1147
 v9fs_session_init+0x24b9/0x2970 fs/9p/v9fs.c:449
 v9fs_mount+0x107/0x11b0 fs/9p/vfs_super.c:135
 mount_fs+0x29b/0x780 fs/super.c:1277
 vfs_kern_mount+0x222/0x990 fs/namespace.c:1037
 do_new_mount fs/namespace.c:2518 [inline]
 do_mount+0xd30/0x5310 fs/namespace.c:2848
 ksys_mount+0x32e/0x3d0 fs/namespace.c:3064
 __do_sys_mount fs/namespace.c:3078 [inline]
 __se_sys_mount fs/namespace.c:3075 [inline]
 __x64_sys_mount+0x157/0x1c0 fs/namespace.c:3075
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x445f79
Code: e8 cc e6 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b 0d fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007ffb83104da8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000006dbc3c RCX: 0000000000445f79
RDX: 0000000020000180 RSI: 00000000200000c0 RDI: 0000000000000000
RBP: 00000000006dbc38 R08: 00000000200001c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0030656c69662f2e
R13: 64663d736e617274 R14: 7974697275636573 R15: 0000000000000001

Local variable description: ----ecode.i@p9_client_rpc
Variable was created at:
 p9_client_rpc+0x183/0x1dc0 net/9p/client.c:750
 p9_client_attach+0x35b/0xc30 net/9p/client.c:1147
==================================================================

Crashes (5):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-kmsan-gce	2018/07/12 09:23	https://github.com/google/kmsan.git master	b64f7ec0	2e0e3130	.config	log	report	syz	C
ci-upstream-kmsan-gce	2018/07/12 02:16	https://github.com/google/kmsan.git master	b64f7ec0	2e0e3130	.config	log	report
ci-upstream-kmsan-gce	2018/07/11 09:12	https://github.com/google/kmsan.git master	b64f7ec0	2e0e3130	.config	log	report
ci-upstream-kmsan-gce	2018/07/10 15:58	https://github.com/google/kmsan.git master	b64f7ec0	9fa03fa5	.config	log	report
ci-upstream-kmsan-gce	2018/07/10 14:53	https://github.com/google/kmsan.git master	b64f7ec0	9fa03fa5	.config	log	report