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From:   Rondreis <linhaoguo86@gmail.com>
Date:   Thu, 22 Sep 2022 19:24:50 +0800
Message-ID: <CAB7eex+TLOB1-dnUZ=ELwNQcj9+QN_JTZVyMmNYNvAUqrJkQZg@mail.gmail.com>
Subject: WARNING in dvb_frontend_get_event
To:     mchehab@kernel.org, kernel@tuxforce.de,
        linux-media@vger.kernel.org, linux-kernel@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
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Hello,

When fuzzing the Linux kernel driver v6.0-rc6, the following crash was
triggered.

HEAD commit: 521a547ced6477c54b4b0cc206000406c221b4d6
git tree: upstream

kernel config: https://pastebin.com/raw/hekxU61F
console output: https://pastebin.com/raw/r045maxd

Sorry for failing to extract the reproducer. But on other versions of
Linux, I also triggered this crash.

I would appreciate it if you have any idea how to solve this bug.

The crash report is as follows:
------------[ cut here ]------------
do not call blocking ops when !TASK_RUNNING; state=1 set at
[<ffffffff815b0c88>] prepare_to_wait_event+0x68/0x680
kernel/sched/wait.c:329
WARNING: CPU: 0 PID: 20443 at kernel/sched/core.c:9815
__might_sleep+0x105/0x150 kernel/sched/core.c:9815
Modules linked in:
CPU: 0 PID: 20443 Comm: syz-executor.2 Not tainted 6.0.0-rc6+ #3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:__might_sleep+0x105/0x150 kernel/sched/core.c:9815
Code: 6f 02 00 48 8d bb c8 16 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00
75 34 48 8b 93 c8 16 00 00 48 c7 c7 60 22 cc 89 e8 ce 04 d5 07 <0f> 0b
e9 75 ff ff ff e8 3f 7d 76 00 e9 26 ff ff ff 89 34 24 e8 42
RSP: 0018:ffffc90003537ac8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888041fcd7c0 RCX: 0000000000000000
RDX: ffffc9000f67a000 RSI: ffff888041fcd7c0 RDI: fffff520006a6f4b
RBP: ffffffff89cc8840 R08: ffffffff816154d8 R09: 0000000000000000
R10: 0000000000000005 R11: ffffed1005984f2d R12: 000000000000003a
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888061936260
FS: 00007ff9a1382700(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbdcc616000 CR3: 0000000052e2c000 CR4: 0000000000350ef0
Call Trace:
<TASK>
down+0x19/0x90 kernel/locking/semaphore.c:58
dvb_frontend_test_event drivers/media/dvb-core/dvb_frontend.c:277 [inline]
dvb_frontend_get_event.isra.0+0x523/0x670
drivers/media/dvb-core/dvb_frontend.c:301
dvb_frontend_handle_ioctl+0x1bf4/0x2f00
drivers/media/dvb-core/dvb_frontend.c:2715
dvb_frontend_do_ioctl+0x1c0/0x2e0 drivers/media/dvb-core/dvb_frontend.c:2089
dvb_usercopy+0xb9/0x270 drivers/media/dvb-core/dvbdev.c:941
dvb_frontend_ioctl+0x55/0x80 drivers/media/dvb-core/dvb_frontend.c:2103
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff9a0ca80fd
Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff9a1381bf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff9a0d9c410 RCX: 00007ff9a0ca80fd
RDX: 00000000200001c0 RSI: 0000000080286f4e RDI: 0000000000000003
RBP: 00007ff9a0d0b606 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc30899fcf R14: 00007ffc3089a170 R15: 00007ff9a1381d80
</TASK>