6b40bec3b1
Don't call quiesce(1) and quiesce(0) if array is already suspended, otherwise in level_store, the array is writable after mddev_detach in below part though the intention is to make array writable after resume. mddev_suspend(mddev); mddev_detach(mddev); ... mddev_resume(mddev); And it also causes calltrace as follows in [1]. [48005.653834] WARNING: CPU: 1 PID: 45380 at kernel/kthread.c:510 kthread_park+0x77/0x90 [...] [48005.653976] CPU: 1 PID: 45380 Comm: mdadm Tainted: G OE 5.4.10-arch1-1 #1 [48005.653979] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./J4105-ITX, BIOS P1.40 08/06/2018 [48005.653984] RIP: 0010:kthread_park+0x77/0x90 [48005.654015] Call Trace: [48005.654039] r5l_quiesce+0x3c/0x70 [raid456] [48005.654052] raid5_quiesce+0x228/0x2e0 [raid456] [48005.654073] mddev_detach+0x30/0x70 [md_mod] [48005.654090] level_store+0x202/0x670 [md_mod] [48005.654099] ? security_capable+0x40/0x60 [48005.654114] md_attr_store+0x7b/0xc0 [md_mod] [48005.654123] kernfs_fop_write+0xce/0x1b0 [48005.654132] vfs_write+0xb6/0x1a0 [48005.654138] ksys_write+0x67/0xe0 [48005.654146] do_syscall_64+0x4e/0x140 [48005.654155] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [48005.654161] RIP: 0033:0x7fa0c8737497 [1]: https://bugzilla.kernel.org/show_bug.cgi?id=206161 Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com> Signed-off-by: Song Liu <songliubraving@fb.com>
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.