forge/linux-uconsole: Linux kernel for uConsole

Linux kernel for uConsole

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Gabriel Krisman Bertazi a2cf97eaaa dm multipath: use updated MPATHF_QUEUE_IO on mapping for bio-based mpath commit `5686dee34d` upstream. When adding devices that don't have a scsi_dh on a BIO based multipath, I was able to consistently hit the warning below and lock-up the system. The problem is that __map_bio reads the flag before it potentially being modified by choose_pgpath, and ends up using the older value. The WARN_ON below is not trivially linked to the issue. It goes like this: The activate_path delayed_work is not initialized for non-scsi_dh devices, but we always set MPATHF_QUEUE_IO, asking for initialization. That is fine, since MPATHF_QUEUE_IO would be cleared in choose_pgpath. Nevertheless, only for BIO-based mpath, we cache the flag before calling choose_pgpath, and use the older version when deciding if we should initialize the path. Therefore, we end up trying to initialize the paths, and calling the non-initialized activate_path work. [ 82.437100] ------------[ cut here ]------------ [ 82.437659] WARNING: CPU: 3 PID: 602 at kernel/workqueue.c:1624 __queue_delayed_work+0x71/0x90 [ 82.438436] Modules linked in: [ 82.438911] CPU: 3 PID: 602 Comm: systemd-udevd Not tainted 5.6.0-rc6+ #339 [ 82.439680] RIP: 0010:__queue_delayed_work+0x71/0x90 [ 82.440287] Code: c1 48 89 4a 50 81 ff 00 02 00 00 75 2a 4c 89 cf e9 94 d6 07 00 e9 7f e9 ff ff 0f 0b eb c7 0f 0b 48 81 7a 58 40 74 a8 94 74 a7 <0f> 0b 48 83 7a 48 00 74 a5 0f 0b eb a1 89 fe 4c 89 cf e9 c8 c4 07 [ 82.441719] RSP: 0018:ffffb738803977c0 EFLAGS: 00010007 [ 82.442121] RAX: ffffa086389f9740 RBX: 0000000000000002 RCX: 0000000000000000 [ 82.442718] RDX: ffffa086350dd930 RSI: ffffa0863d76f600 RDI: 0000000000000200 [ 82.443484] RBP: 0000000000000200 R08: 0000000000000000 R09: ffffa086350dd970 [ 82.444128] R10: 0000000000000000 R11: 0000000000000000 R12: ffffa086350dd930 [ 82.444773] R13: ffffa0863d76f600 R14: 0000000000000000 R15: ffffa08636738008 [ 82.445427] FS: 00007f6abfe9dd40(0000) GS:ffffa0863dd80000(0000) knlGS:00000 [ 82.446040] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 82.446478] CR2: 0000557d288db4e8 CR3: 0000000078b36000 CR4: 00000000000006e0 [ 82.447104] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 82.447561] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 82.448012] Call Trace: [ 82.448164] queue_delayed_work_on+0x6d/0x80 [ 82.448472] __pg_init_all_paths+0x7b/0xf0 [ 82.448714] pg_init_all_paths+0x26/0x40 [ 82.448980] __multipath_map_bio.isra.0+0x84/0x210 [ 82.449267] __map_bio+0x3c/0x1f0 [ 82.449468] __split_and_process_non_flush+0x14a/0x1b0 [ 82.449775] __split_and_process_bio+0xde/0x340 [ 82.450045] ? dm_get_live_table+0x5/0xb0 [ 82.450278] dm_process_bio+0x98/0x290 [ 82.450518] dm_make_request+0x54/0x120 [ 82.450778] generic_make_request+0xd2/0x3e0 [ 82.451038] ? submit_bio+0x3c/0x150 [ 82.451278] submit_bio+0x3c/0x150 [ 82.451492] mpage_readpages+0x129/0x160 [ 82.451756] ? bdev_evict_inode+0x1d0/0x1d0 [ 82.452033] read_pages+0x72/0x170 [ 82.452260] __do_page_cache_readahead+0x1ba/0x1d0 [ 82.452624] force_page_cache_readahead+0x96/0x110 [ 82.452903] generic_file_read_iter+0x84f/0xae0 [ 82.453192] ? __seccomp_filter+0x7c/0x670 [ 82.453547] new_sync_read+0x10e/0x190 [ 82.453883] vfs_read+0x9d/0x150 [ 82.454172] ksys_read+0x65/0xe0 [ 82.454466] do_syscall_64+0x4e/0x210 [ 82.454828] entry_SYSCALL_64_after_hwframe+0x49/0xbe [...] [ 82.462501] ---[ end trace bb39975e9cf45daa ]--- Cc: stable@vger.kernel.org Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-05-06 08:13:29 +02:00
arch	bpf, x86_32: Fix clobbering of dst for BPF_JSET	2020-05-02 17:26:00 +02:00
block	block, bfq: fix use-after-free in bfq_idle_slice_timer_body	2020-04-17 10:48:42 +02:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	crypto: api - Fix race condition in crypto_spawn_alg	2020-02-11 04:34:05 -08:00
Documentation	arm64: errata: Hide CTR_EL0.DIC on systems affected by Neoverse-N1 #1542419	2020-04-29 16:31:08 +02:00
drivers	dm multipath: use updated MPATHF_QUEUE_IO on mapping for bio-based mpath	2020-05-06 08:13:29 +02:00
firmware	Fix built-in early-load Intel microcode alignment	2020-01-23 08:21:29 +01:00
fs	btrfs: fix block group leak when removing fails	2020-05-06 08:13:27 +02:00
include	qed: Fix use after free in qed_chain_free	2020-05-02 17:26:00 +02:00
init	fork: fix some -Wmissing-prototypes warnings	2019-12-05 09:21:04 +01:00
ipc	ipc/util.c: sysvipc_find_ipc() should increase position index	2020-04-29 16:31:13 +02:00
kernel	PM: hibernate: Freeze kernel threads in software_resume()	2020-05-06 08:13:28 +02:00
lib	lib/raid6: use vdupq_n_u8 to avoid endianness warnings	2020-04-23 10:30:15 +02:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	mm: shmem: disable interrupt when acquiring info->lock in userfaultfd_copy path	2020-05-02 17:25:54 +02:00
net	svcrdma: Fix leak of svc_rdma_recv_ctxt objects	2020-05-02 17:25:52 +02:00
samples	vmalloc: fix remap_vmalloc_range() bounds checks	2020-04-29 16:31:27 +02:00
scripts	kconfig: qconf: Fix a few alignment issues	2020-04-29 16:31:13 +02:00
security	KEYS: Avoid false positive ENOMEM error on key read	2020-04-29 16:31:23 +02:00
sound	ALSA: pcm: oss: Place the plugin buffer overflow checks correctly	2020-05-06 08:13:28 +02:00
tools	objtool: Support Clang non-section symbols in ORC dump	2020-05-02 17:25:57 +02:00
usr	initramfs: restore default compression behavior	2020-04-13 10:44:59 +02:00
virt	x86/kvm: Cache gfn to pfn translation	2020-04-29 16:31:19 +02:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	MAINTAINERS: Update drm/i915 bug filing URL	2020-02-28 16:38:49 +01:00
Makefile	Linux 4.19.120	2020-05-02 17:26:01 +02:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.