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KMSAN: uninit-value in p9_client_rpc

Status: auto-obsoleted due to no activity on 2023/03/29 15:29
Labels: 9p net (incorrect?)
Reported-by: syzbot+4de40388f584432bf004@syzkaller.appspotmail.com
First crash: 1787d, last: 184d
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
Reminder: 18 open syzbot bugs in "fs/9p" subsystem 1 (1) 2019/07/24 01:46
Reminder: 18 open syzbot bugs in "fs/9p" subsystem 1 (1) 2019/07/02 06:29
KMSAN: uninit-value in p9_client_rpc 1 (3) 2018/07/12 13:36
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2023/03/09 15:32 23m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci OK log
2023/03/09 15:32 24m retest repro https://github.com/google/kmsan.git master OK log
2022/09/21 00:29 20m retest repro https://github.com/google/kmsan.git master report log
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 (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Manager Title
2018/07/12 09:23 https://github.com/google/kmsan.git master b64f7ec04e12 2e0e3130 .config console log report syz C ci-upstream-kmsan-gce
2022/11/29 15:29 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 6d464646530f 05dc7993 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel NULL pointer dereference in p9_client_rpc
2021/08/24 09:39 https://github.com/google/kmsan.git master 40b1d724c752 b599f2fc .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in p9_client_rpc
2021/07/10 20:25 https://github.com/google/kmsan.git master 57b5797c8013 8f5a7b8c .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in p9_client_rpc
2021/07/04 07:32 https://github.com/google/kmsan.git master 57b5797c8013 55aa55c2 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in p9_client_rpc
2021/05/09 10:59 https://github.com/google/kmsan.git master 4ebaab5fb428 bc5434be .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in p9_client_rpc
2021/05/07 18:06 https://github.com/google/kmsan.git master 4ebaab5fb428 f6da8120 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in p9_client_rpc
2018/07/12 02:16 https://github.com/google/kmsan.git master b64f7ec04e12 2e0e3130 .config console log report ci-upstream-kmsan-gce
2018/07/11 09:12 https://github.com/google/kmsan.git master b64f7ec04e12 2e0e3130 .config console log report ci-upstream-kmsan-gce
2018/07/10 15:58 https://github.com/google/kmsan.git master b64f7ec04e12 9fa03fa5 .config console log report ci-upstream-kmsan-gce
2018/07/10 14:53 https://github.com/google/kmsan.git master b64f7ec04e12 9fa03fa5 .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.