MIME-Version: 1.0
Date:   Sun, 12 Mar 2023 13:41:23 -0700
In-Reply-To: <20230312202027.46brae36wrbypwge@fpc>
Message-ID: <00000000000081589c05f6ba0468@google.com>
Subject: Re: [syzbot] [wireless?] KMSAN: uninit-value in ath9k_hw_init
From:   syzbot <syzbot+df61b36319e045c00a08@syzkaller.appspotmail.com>
To:     glider@google.com, linux-kernel@vger.kernel.org,
        pchelkin@ispras.ru, syzkaller-bugs@googlegroups.com
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in ath9k_hw_init

ath9k_htc 3-1:1.0: ath9k_htc: HTC initialized with 33 credits
=====================================================
BUG: KMSAN: uninit-value in ath9k_hw_read_revisions drivers/net/wireless/ath/ath9k/hw.c:289 [inline]
BUG: KMSAN: uninit-value in __ath9k_hw_init drivers/net/wireless/ath/ath9k/hw.c:572 [inline]
BUG: KMSAN: uninit-value in ath9k_hw_init+0x119e/0x2ba0 drivers/net/wireless/ath/ath9k/hw.c:700
 ath9k_hw_read_revisions drivers/net/wireless/ath/ath9k/hw.c:289 [inline]
 __ath9k_hw_init drivers/net/wireless/ath/ath9k/hw.c:572 [inline]
 ath9k_hw_init+0x119e/0x2ba0 drivers/net/wireless/ath/ath9k/hw.c:700
 ath9k_init_priv drivers/net/wireless/ath/ath9k/htc_drv_init.c:662 [inline]
 ath9k_init_device drivers/net/wireless/ath/ath9k/htc_drv_init.c:839 [inline]
 ath9k_htc_probe_device+0xf48/0x3b60 drivers/net/wireless/ath/ath9k/htc_drv_init.c:963
 ath9k_htc_hw_init+0x4f/0x100 drivers/net/wireless/ath/ath9k/htc_hst.c:523
 ath9k_hif_usb_firmware_cb+0x2eb/0x800 drivers/net/wireless/ath/ath9k/hif_usb.c:1256
 request_firmware_work_func+0x130/0x240 drivers/base/firmware_loader/main.c:1107
 process_one_work+0xb0d/0x1410 kernel/workqueue.c:2390
 worker_thread+0x107e/0x1d60 kernel/workqueue.c:2537
 kthread+0x31f/0x430 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Local variable val created at:
 ath9k_regread+0x62/0x1b0 drivers/net/wireless/ath/ath9k/htc_drv_init.c:239
 ath9k_hw_read_revisions drivers/net/wireless/ath/ath9k/hw.c:287 [inline]
 __ath9k_hw_init drivers/net/wireless/ath/ath9k/hw.c:572 [inline]
 ath9k_hw_init+0x5c4/0x2ba0 drivers/net/wireless/ath/ath9k/hw.c:700

CPU: 0 PID: 5569 Comm: kworker/0:4 Not tainted 6.3.0-rc1-syzkaller-00010-ge61893130d87-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Workqueue: events request_firmware_work_func
=====================================================


Tested on:

commit:         e6189313 kmsan: add test_stackdepot_roundtrip
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=1508f12ac80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ef8f90a9dd9b8eae
dashboard link: https://syzkaller.appspot.com/bug?extid=df61b36319e045c00a08
compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
patch:          https://syzkaller.appspot.com/x/patch.diff?x=10cabf24c80000