From: Kent Gibson <warthog618@gmail.com>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Bartosz Golaszewski <brgl@bgdev.pl>
Subject: linux 5.15-rc4: refcount underflow when unloading gpio-mockup
Date: Mon, 4 Oct 2021 17:34:16 +0800 [thread overview]
Message-ID: <20211004093416.GA2513199@sol> (raw)
Hi,
I'm seeing a refcount underflow when I unload the gpio-mockup module on
Linux v5.15-rc4 (and going back to v5.15-rc1):
# modprobe gpio-mockup gpio_mockup_ranges=-1,4,-1,10
# rmmod gpio-mockup
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 103 at lib/refcount.c:28 refcount_warn_saturate+0xd1/0x120
Modules linked in: gpio_mockup(-)
CPU: 0 PID: 103 Comm: rmmod Not tainted 5.15.0-rc4 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
EIP: refcount_warn_saturate+0xd1/0x120
Code: e8 a2 b0 3b 00 0f 0b eb 83 80 3d db 2a 8c c1 00 0f 85 76 ff ff ff c7 04 24 88 85 78 c1 b1 01 88 0d db 2a 8c c1 e8 7d b0 3b 00 <0f> 0b e9 5b ff ff ff 80 3d d9 2a 8c c1 00 0f 85 4e ff ff ff c7 04
EAX: 00000026 EBX: c250b100 ECX: f5fe8c28 EDX: 00000000
ESI: c244860c EDI: c250b100 EBP: c245be84 ESP: c245be80
DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 EFLAGS: 00000296
CR0: 80050033 CR2: b7e3c3e1 CR3: 024ba000 CR4: 00000690
Call Trace:
kobject_put+0xdc/0xf0
software_node_notify_remove+0xa8/0xc0
device_del+0x15a/0x3e0
? kfree_const+0xf/0x30
? kobject_put+0xa6/0xf0
? module_remove_driver+0x73/0xa0
platform_device_del.part.0+0xf/0x80
platform_device_unregister+0x19/0x40
gpio_mockup_unregister_pdevs+0x13/0x1b [gpio_mockup]
gpio_mockup_exit+0x1c/0x68c [gpio_mockup]
__ia32_sys_delete_module+0x137/0x1e0
? task_work_run+0x61/0x90
? exit_to_user_mode_prepare+0x1b5/0x1c0
__do_fast_syscall_32+0x50/0xc0
do_fast_syscall_32+0x32/0x70
do_SYSENTER_32+0x15/0x20
entry_SYSENTER_32+0x98/0xe7
EIP: 0xb7eda549
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d 76 00 58 b8 77 00 00 00 cd 80 90 8d 76
EAX: ffffffda EBX: 0045a19c ECX: 00000800 EDX: 0045a160
ESI: fffffffe EDI: 0045a160 EBP: bff19d08 ESP: bff19cc8
DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00000202
---[ end trace 3d71387f54bc2d06 ]---
I suspect this is related to the recent changes to swnode.c or
platform.c, as gpio-mockup hasn't changed, but haven't had the
chance to debug further.
Cheers,
Kent.
next reply other threads:[~2021-10-04 9:34 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-04 9:34 Kent Gibson [this message]
2021-10-04 9:44 ` linux 5.15-rc4: refcount underflow when unloading gpio-mockup Greg Kroah-Hartman
2021-10-04 9:58 ` Kent Gibson
2021-10-04 12:19 ` Kent Gibson
2021-10-04 12:30 ` Heikki Krogerus
2021-10-04 12:47 ` Kent Gibson
2021-10-04 13:20 ` Heikki Krogerus
2021-10-04 14:17 ` Kent Gibson
2021-10-04 15:28 ` Kent Gibson
2021-10-04 19:56 ` Andy Shevchenko
2021-10-05 0:40 ` Kent Gibson
2021-10-05 8:21 ` Andy Shevchenko
2021-10-05 9:50 ` Heikki Krogerus
2021-10-05 9:53 ` Andy Shevchenko
2021-10-05 9:57 ` Heikki Krogerus
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