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Johannes Weiner 4d6c334dea mm: zswap: fix writeback shinker GFP_NOIO/GFP_NOFS recursion commit `30fb6a8d9e` upstream. Kent forwards this bug report of zswap re-entering the block layer from an IO request allocation and locking up: [10264.128242] sysrq: Show Blocked State [10264.128268] task:kworker/20:0H state:D stack:0 pid:143 tgid:143 ppid:2 flags:0x00004000 [10264.128271] Workqueue: bcachefs_io btree_write_submit [bcachefs] [10264.128295] Call Trace: [10264.128295] <TASK> [10264.128297] __schedule+0x3e6/0x1520 [10264.128303] schedule+0x32/0xd0 [10264.128304] schedule_timeout+0x98/0x160 [10264.128308] io_schedule_timeout+0x50/0x80 [10264.128309] wait_for_completion_io_timeout+0x7f/0x180 [10264.128310] submit_bio_wait+0x78/0xb0 [10264.128313] swap_writepage_bdev_sync+0xf6/0x150 [10264.128317] zswap_writeback_entry+0xf2/0x180 [10264.128319] shrink_memcg_cb+0xe7/0x2f0 [10264.128322] __list_lru_walk_one+0xb9/0x1d0 [10264.128325] list_lru_walk_one+0x5d/0x90 [10264.128326] zswap_shrinker_scan+0xc4/0x130 [10264.128327] do_shrink_slab+0x13f/0x360 [10264.128328] shrink_slab+0x28e/0x3c0 [10264.128329] shrink_one+0x123/0x1b0 [10264.128331] shrink_node+0x97e/0xbc0 [10264.128332] do_try_to_free_pages+0xe7/0x5b0 [10264.128333] try_to_free_pages+0xe1/0x200 [10264.128334] __alloc_pages_slowpath.constprop.0+0x343/0xde0 [10264.128337] __alloc_pages+0x32d/0x350 [10264.128338] allocate_slab+0x400/0x460 [10264.128339] ___slab_alloc+0x40d/0xa40 [10264.128345] kmem_cache_alloc+0x2e7/0x330 [10264.128348] mempool_alloc+0x86/0x1b0 [10264.128349] bio_alloc_bioset+0x200/0x4f0 [10264.128352] bio_alloc_clone+0x23/0x60 [10264.128354] alloc_io+0x26/0xf0 [dm_mod 7e9e6b44df4927f93fb3e4b5c782767396f58382] [10264.128361] dm_submit_bio+0xb8/0x580 [dm_mod 7e9e6b44df4927f93fb3e4b5c782767396f58382] [10264.128366] __submit_bio+0xb0/0x170 [10264.128367] submit_bio_noacct_nocheck+0x159/0x370 [10264.128368] bch2_submit_wbio_replicas+0x21c/0x3a0 [bcachefs 85f1b9a7a824f272eff794653a06dde1a94439f2] [10264.128391] btree_write_submit+0x1cf/0x220 [bcachefs 85f1b9a7a824f272eff794653a06dde1a94439f2] [10264.128406] process_one_work+0x178/0x350 [10264.128408] worker_thread+0x30f/0x450 [10264.128409] kthread+0xe5/0x120 The zswap shrinker resumes the swap_writepage()s that were intercepted by the zswap store. This will enter the block layer, and may even enter the filesystem depending on the swap backing file. Make it respect GFP_NOIO and GFP_NOFS. Link: https://lore.kernel.org/linux-mm/rc4pk2r42oyvjo4dc62z6sovquyllq56i5cdgcaqbd7wy3hfzr@n4nbxido3fme/ Link: https://lkml.kernel.org/r/20240321182532.60000-1-hannes@cmpxchg.org Fixes: `b5ba474f3f` ("zswap: shrink zswap pool based on memory pressure") Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Reported-by: Kent Overstreet <kent.overstreet@linux.dev> Acked-by: Yosry Ahmed <yosryahmed@google.com> Reported-by: Jérôme Poulin <jeromepoulin@gmail.com> Reviewed-by: Nhat Pham <nphamcs@gmail.com> Reviewed-by: Chengming Zhou <chengming.zhou@linux.dev> Cc: stable@vger.kernel.org [v6.8] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-04-03 15:32:37 +02:00
arch	x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD	2024-04-03 15:32:34 +02:00
block	Revert "block/mq-deadline: use correct way to throttling write requests"	2024-04-03 15:32:22 +02:00
certs
crypto	Revert "crypto: pkcs7 - remove sha1 support"	2024-04-03 15:32:31 +02:00
Documentation	x86/Kconfig: Remove CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT	2024-04-03 15:32:32 +02:00
drivers	drm/amd/display: Prevent crash when disable stream	2024-04-03 15:32:36 +02:00
fs	btrfs: do not skip re-registration for the mounted device	2024-04-03 15:32:35 +02:00
include	Revert "crypto: pkcs7 - remove sha1 support"	2024-04-03 15:32:31 +02:00
init	modules: wait do_free_init correctly	2024-03-26 18:17:17 -04:00
io_uring	io_uring/waitid: always remove waitid entry for cancel all	2024-04-03 15:32:24 +02:00
ipc
kernel	printk: Update @console_may_schedule in console_trylock_spinning()	2024-04-03 15:32:33 +02:00
lib	pci_iounmap(): Fix MMIO mapping leak	2024-04-03 15:32:02 +02:00
LICENSES
mm	mm: zswap: fix writeback shinker GFP_NOIO/GFP_NOFS recursion	2024-04-03 15:32:37 +02:00
net	netfilter: nf_tables: reject constant set with timeout	2024-04-03 15:32:31 +02:00
rust	Rust changes for v6.8	2024-01-11 13:05:41 -08:00
samples	work around gcc bugs with 'asm goto' with outputs	2024-02-09 15:57:48 -08:00
scripts	kbuild: Move -Wenum-{compare-conditional,enum-conversion} into W=1	2024-04-03 15:32:18 +02:00
security	lsm: handle the NULL buffer case in lsm_fill_user_ctx()	2024-04-03 15:32:22 +02:00
sound	ALSA: hda/tas2781: add locks to kcontrols	2024-04-03 15:32:36 +02:00
tools	selftests/mm: Fix build with _FORTIFY_SOURCE	2024-04-03 15:32:35 +02:00
usr	Kbuild updates for v6.8	2024-01-18 17:57:07 -08:00
virt	KVM: Always flush async #PF workqueue when vCPU is being destroyed	2024-04-03 15:32:03 +02:00
.clang-format
.cocciconfig
.editorconfig	Add .editorconfig file for basic formatting	2023-12-28 16:22:47 +09:00
.get_maintainer.ignore
.gitattributes
.gitignore	Add .editorconfig file for basic formatting	2023-12-28 16:22:47 +09:00
.mailmap	drm fixes for 6.8 final	2024-03-08 12:44:56 -08:00
.rustfmt.toml
COPYING
CREDITS	MAINTAINERS: supplement of zswap maintainers update	2024-01-25 23:52:21 -08:00
Kbuild
Kconfig
MAINTAINERS	drm fixes for 6.8 final	2024-03-08 12:44:56 -08:00
Makefile	Linux 6.8.2	2024-03-26 18:23:34 -04:00
README

README

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

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

There are various text files in the Documentation/ subdirectory,
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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.