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b=AmDbonAJORQ3YzM2NXvAwX8vQFQYnyLmTcDkZaU0V8hgL3UhUFMvbcM6ccrz5ns8L T5Jjuo5ZTBktCb6tKEYKw62gWte53HGutpQiuoezU60TST8OG+zEjhdPIeYzgXhVm4 WMvj+bCM8WMnIc3e/oDPdpHXlv2JYtaduBFRdZ7JPlX9HRkj+BSOWNGsJsW0Bm/yYO OL8fDJebW6TZyWdYtMh9X7hcSyI12SuHilLUpqmFkwohaiAVHSMlHgW+ISa+eNmxH2 jbGI0vcZDx1dFVhWY/ZOFn89nAGWHdVPa3L7jaP6M0If+7BtZbpectk35Y77Rj8VQr NY4qxZgMoRZTQ== From: Mike Snitzer To: Andrew Morton Cc: Trond Myklebust , Anna Schumaker , linux-nfs@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v3 for-akpm for-6.14-rcX] NFS: fix nfs_release_folio() to not deadlock via kcompactd writeback Date: Tue, 25 Feb 2025 15:19:42 -0500 Message-ID: <20250225201942.31669-1-snitzer@kernel.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 2E94E4000B X-Stat-Signature: ipdku8qdnn3bg386dpndnaxh7pf4rtj8 X-Rspamd-Server: rspam03 X-HE-Tag: 1740514784-16015 X-HE-Meta: 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 WisxME/m d0DuJYqe5+0pQcLbwSFiKdfxnGyDBncwMVI79n0ocpeuJXp3MTVlXOxygEt3PFeLr0i7ocAaamsXs2GdvSOpVvFRhmj6hpqbytaRSMO4C6EpLroESrr9brbXTIM39KZDST/ZpGbhkoWOKZX8XRVKIvNuASuHDnxUCkt2EsbGeuZe7qJTVP7/hxLp85w5Dow6uiA2BpDOTHMtcC5jOn4Pyndv5HebLWJ2QcP00XHFnC93sFCWKxiAsQggeSaM1KMgTFJ46FDcwctQDCHqo9DavzOoRnw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add PF_KCOMPACTD flag and current_is_kcompactd() helper to check for it so nfs_release_folio() can skip calling nfs_wb_folio() from kcompactd. Otherwise NFS can deadlock waiting for kcompactd enduced writeback which recurses back to NFS (which triggers writeback to NFSD via NFS loopback mount on the same host, NFSD blocks waiting for XFS's call to __filemap_get_folio): 6070.550357] INFO: task kcompactd0:58 blocked for more than 4435 seconds. {--- [58] "kcompactd0" [<0>] folio_wait_bit+0xe8/0x200 [<0>] folio_wait_writeback+0x2b/0x80 [<0>] nfs_wb_folio+0x80/0x1b0 [nfs] [<0>] nfs_release_folio+0x68/0x130 [nfs] [<0>] split_huge_page_to_list_to_order+0x362/0x840 [<0>] migrate_pages_batch+0x43d/0xb90 [<0>] migrate_pages_sync+0x9a/0x240 [<0>] migrate_pages+0x93c/0x9f0 [<0>] compact_zone+0x8e2/0x1030 [<0>] compact_node+0xdb/0x120 [<0>] kcompactd+0x121/0x2e0 [<0>] kthread+0xcf/0x100 [<0>] ret_from_fork+0x31/0x40 [<0>] ret_from_fork_asm+0x1a/0x30 ---} Fixes: 96780ca55e3cb ("NFS: fix up nfs_release_folio() to try to release the page") Signed-off-by: Mike Snitzer --- fs/nfs/file.c | 3 ++- include/linux/compaction.h | 5 +++++ include/linux/sched.h | 2 +- mm/compaction.c | 3 +++ 4 files changed, 11 insertions(+), 2 deletions(-) v3: rebase to latest Linus tree (commit cc8a0934d099). v2: use |= to properly set PF_KCOMPACTD in kcompactd(). Also adjust subject to reflect this patch fixes a deadlock. diff --git a/fs/nfs/file.c b/fs/nfs/file.c index 1bb646752e46..033feeab8c34 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include @@ -457,7 +458,7 @@ static bool nfs_release_folio(struct folio *folio, gfp_t gfp) /* If the private flag is set, then the folio is not freeable */ if (folio_test_private(folio)) { if ((current_gfp_context(gfp) & GFP_KERNEL) != GFP_KERNEL || - current_is_kswapd()) + current_is_kswapd() || current_is_kcompactd()) return false; if (nfs_wb_folio(folio->mapping->host, folio) < 0) return false; diff --git a/include/linux/compaction.h b/include/linux/compaction.h index e94776496049..7bf0c521db63 100644 --- a/include/linux/compaction.h +++ b/include/linux/compaction.h @@ -80,6 +80,11 @@ static inline unsigned long compact_gap(unsigned int order) return 2UL << order; } +static inline int current_is_kcompactd(void) +{ + return current->flags & PF_KCOMPACTD; +} + #ifdef CONFIG_COMPACTION extern unsigned int extfrag_for_order(struct zone *zone, unsigned int order); diff --git a/include/linux/sched.h b/include/linux/sched.h index 9632e3318e0d..9c15365a30c0 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1701,7 +1701,7 @@ extern struct pid *cad_pid; #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */ #define PF_USER_WORKER 0x00004000 /* Kernel thread cloned from userspace thread */ #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */ -#define PF__HOLE__00010000 0x00010000 +#define PF_KCOMPACTD 0x00010000 /* I am kcompactd */ #define PF_KSWAPD 0x00020000 /* I am kswapd */ #define PF_MEMALLOC_NOFS 0x00040000 /* All allocations inherit GFP_NOFS. See memalloc_nfs_save() */ #define PF_MEMALLOC_NOIO 0x00080000 /* All allocations inherit GFP_NOIO. See memalloc_noio_save() */ diff --git a/mm/compaction.c b/mm/compaction.c index 12ed8425fa17..a3203d97123e 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -3181,6 +3181,7 @@ static int kcompactd(void *p) long default_timeout = msecs_to_jiffies(HPAGE_FRAG_CHECK_INTERVAL_MSEC); long timeout = default_timeout; + current->flags |= PF_KCOMPACTD; set_freezable(); pgdat->kcompactd_max_order = 0; @@ -3237,6 +3238,8 @@ static int kcompactd(void *p) pgdat->proactive_compact_trigger = false; } + current->flags &= ~PF_KCOMPACTD; + return 0; }