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Wei Wang 163b00cde7 thermal: Fix deadlock in thermal thermal_zone_device_check `1851799e1d` ("thermal: Fix use-after-free when unregistering thermal zone device") changed cancel_delayed_work to cancel_delayed_work_sync to avoid a use-after-free issue. However, cancel_delayed_work_sync could be called insides the WQ causing deadlock. [54109.642398] c0 1162 kworker/u17:1 D 0 11030 2 0x00000000 [54109.642437] c0 1162 Workqueue: thermal_passive_wq thermal_zone_device_check [54109.642447] c0 1162 Call trace: [54109.642456] c0 1162 __switch_to+0x138/0x158 [54109.642467] c0 1162 __schedule+0xba4/0x1434 [54109.642480] c0 1162 schedule_timeout+0xa0/0xb28 [54109.642492] c0 1162 wait_for_common+0x138/0x2e8 [54109.642511] c0 1162 flush_work+0x348/0x40c [54109.642522] c0 1162 __cancel_work_timer+0x180/0x218 [54109.642544] c0 1162 handle_thermal_trip+0x2c4/0x5a4 [54109.642553] c0 1162 thermal_zone_device_update+0x1b4/0x25c [54109.642563] c0 1162 thermal_zone_device_check+0x18/0x24 [54109.642574] c0 1162 process_one_work+0x3cc/0x69c [54109.642583] c0 1162 worker_thread+0x49c/0x7c0 [54109.642593] c0 1162 kthread+0x17c/0x1b0 [54109.642602] c0 1162 ret_from_fork+0x10/0x18 [54109.643051] c0 1162 kworker/u17:2 D 0 16245 2 0x00000000 [54109.643067] c0 1162 Workqueue: thermal_passive_wq thermal_zone_device_check [54109.643077] c0 1162 Call trace: [54109.643085] c0 1162 __switch_to+0x138/0x158 [54109.643095] c0 1162 __schedule+0xba4/0x1434 [54109.643104] c0 1162 schedule_timeout+0xa0/0xb28 [54109.643114] c0 1162 wait_for_common+0x138/0x2e8 [54109.643122] c0 1162 flush_work+0x348/0x40c [54109.643131] c0 1162 __cancel_work_timer+0x180/0x218 [54109.643141] c0 1162 handle_thermal_trip+0x2c4/0x5a4 [54109.643150] c0 1162 thermal_zone_device_update+0x1b4/0x25c [54109.643159] c0 1162 thermal_zone_device_check+0x18/0x24 [54109.643167] c0 1162 process_one_work+0x3cc/0x69c [54109.643177] c0 1162 worker_thread+0x49c/0x7c0 [54109.643186] c0 1162 kthread+0x17c/0x1b0 [54109.643195] c0 1162 ret_from_fork+0x10/0x18 [54109.644500] c0 1162 cat D 0 7766 1 0x00000001 [54109.644515] c0 1162 Call trace: [54109.644524] c0 1162 __switch_to+0x138/0x158 [54109.644536] c0 1162 __schedule+0xba4/0x1434 [54109.644546] c0 1162 schedule_preempt_disabled+0x80/0xb0 [54109.644555] c0 1162 __mutex_lock+0x3a8/0x7f0 [54109.644563] c0 1162 __mutex_lock_slowpath+0x14/0x20 [54109.644575] c0 1162 thermal_zone_get_temp+0x84/0x360 [54109.644586] c0 1162 temp_show+0x30/0x78 [54109.644609] c0 1162 dev_attr_show+0x5c/0xf0 [54109.644628] c0 1162 sysfs_kf_seq_show+0xcc/0x1a4 [54109.644636] c0 1162 kernfs_seq_show+0x48/0x88 [54109.644656] c0 1162 seq_read+0x1f4/0x73c [54109.644664] c0 1162 kernfs_fop_read+0x84/0x318 [54109.644683] c0 1162 __vfs_read+0x50/0x1bc [54109.644692] c0 1162 vfs_read+0xa4/0x140 [54109.644701] c0 1162 SyS_read+0xbc/0x144 [54109.644708] c0 1162 el0_svc_naked+0x34/0x38 [54109.845800] c0 1162 D 720.000s 1->7766->7766 cat [panic] Fixes: `1851799e1d` ("thermal: Fix use-after-free when unregistering thermal zone device") Cc: stable@vger.kernel.org Signed-off-by: Wei Wang <wvw@google.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>		2019-11-14 22:41:09 +08:00
arch	arm64: defconfig: Enable CONFIG_ENERGY_MODEL	2019-11-07 07:02:40 +01:00
block	iocost: don't nest spin_lock_irq in ioc_weight_write()	2019-10-31 11:40:57 -06:00
certs	PKCS#7: Refactor verify_pkcs7_signature()	2019-08-05 18:40:18 -04:00
crypto	Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2019-09-28 08:14:15 -07:00
Documentation	thermal: Remove netlink support	2019-11-07 07:00:26 +01:00
drivers	thermal: Fix deadlock in thermal thermal_zone_device_check	2019-11-14 22:41:09 +08:00
fs	a small smb3 memleak fix	2019-11-02 14:34:00 -07:00
include	PM / EM: Declare EM data types unconditionally	2019-11-07 07:02:40 +01:00
init	Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2019-09-28 08:14:15 -07:00
ipc	ipc/sem.c: convert to use built-in RCU list checking	2019-09-25 17:51:41 -07:00
kernel	cpufreq: Initialize the governors in core_initcall	2019-11-07 07:00:26 +01:00
lib	lib/vdso: Make clock_getres() POSIX compliant again	2019-10-23 14:48:23 +02:00
LICENSES	LICENSES: Rename other to deprecated	2019-05-03 06:34:32 -06:00
mm	mm/thp: allow dropping THP from page cache	2019-10-19 06:32:33 -04:00
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2019-11-01 17:48:11 -07:00
samples	samples/bpf: Add a workaround for asm_inline	2019-10-03 17:37:11 +02:00
scripts	Modules fixes for v5.4-rc5	2019-10-25 16:11:55 -04:00
security	efi/efi_test: Lock down /dev/efi_test and require CAP_SYS_ADMIN	2019-10-31 09:40:21 +01:00
sound	ALSA: timer: Fix mutex deadlock at releasing card	2019-10-30 22:54:56 +01:00
tools	USB fixes for 5.4-rc6	2019-11-03 08:25:25 -08:00
usr	kbuild: update compile-test header list for v5.4-rc2	2019-10-05 15:29:49 +09:00
virt	kvm: call kvm_arch_destroy_vm if vm creation fails	2019-10-31 12:13:16 +01:00
.clang-format	clang-format: Update with the latest for_each macro list	2019-08-31 10:00:51 +02:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	Modules updates for v5.4	2019-09-22 10:34:46 -07:00
.mailmap	A few MIPS fixes:	2019-10-26 19:43:12 -04:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	MAINTAINERS: Remove Simon as Renesas SoC Co-Maintainer	2019-10-10 08:12:51 -07:00
Kbuild	kbuild: do not descend to ./Kbuild when cleaning	2019-08-21 21:03:58 +09:00
Kconfig	docs: kbuild: convert docs to ReST and rename to *.rst	2019-06-14 14:21:21 -06:00
MAINTAINERS	MAINTAINERS: add entry for Amlogic Thermal driver	2019-11-07 07:00:26 +01:00
Makefile	Linux 5.4-rc6	2019-11-03 14:07:26 -08:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.