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GET /api/patches/2216363/?format=api
{ "id": 2216363, "url": "http://patchwork.ozlabs.org/api/patches/2216363/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260326104544.509518-4-dhowells@redhat.com/", "project": { "id": 12, "url": "http://patchwork.ozlabs.org/api/projects/12/?format=api", "name": "Linux CIFS Client", "link_name": "linux-cifs-client", "list_id": "linux-cifs.vger.kernel.org", "list_email": "linux-cifs@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260326104544.509518-4-dhowells@redhat.com>", "list_archive_url": null, "date": "2026-03-26T10:45:18", "name": "[03/26] netfs: fix VM_BUG_ON_FOLIO() issue in netfs_write_begin() call", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "0d8cf136f0d569899c99e855d51acc8563588138", "submitter": { "id": 59, "url": "http://patchwork.ozlabs.org/api/people/59/?format=api", "name": "David Howells", "email": "dhowells@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260326104544.509518-4-dhowells@redhat.com/mbox/", "series": [ { "id": 497565, "url": "http://patchwork.ozlabs.org/api/series/497565/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=497565", "date": "2026-03-26T10:45:15", "name": "netfs: Keep track of folios in a segmented bio_vec[] chain", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/497565/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2216363/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216363/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-cifs+bounces-10526-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-cifs@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", 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d=subspace.kernel.org; s=arc-20240116;\n\tt=1774522004; cv=none;\n b=qoCWQD25MjS/Io66tZr4aEv98dcK7MJHIEg49zHUG6IqPNRE6wzSoRok5APjPpSd6fS2nrWFLZFRBhRXxKPQcs/7zcRlfUdhHnA21NgRnwi0Ki5uxXiCaY1iMV4sT66tps9JLu116ZeRqUbP7X6O0VLs4M4fAFPyJTZddylEJ34=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1774522004; c=relaxed/simple;\n\tbh=NiEvLX1ucx8Te5c6NeyjhEKcLknIJ7cWOIAJ/htm1KM=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=IXHbqxbI+Fj0yd76UvFxfa4hNSRQTyVGCxnRUvJgr6JkjAAFeu0OR6vfZ/UHszmGSNHaXJGa8dk75CYpKOfl1cAQRcDbBQEEpInL7trDWCcxGDIvSqOY+S8WjnOOHDWG3amz4QmNdmixlF0w9+Y6g781H+zKssiIRLhiOfZOHxw=", "ARC-Authentication-Results": "i=1; smtp.subspace.kernel.org;\n dmarc=pass (p=quarantine dis=none) header.from=redhat.com;\n spf=pass smtp.mailfrom=redhat.com;\n dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com\n header.b=dznW1x4V; arc=none smtp.client-ip=170.10.133.124", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n\ts=mimecast20190719; t=1774522001;\n\th=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n\t to:to:cc:cc:mime-version:mime-version:\n\t content-transfer-encoding:content-transfer-encoding:\n\t in-reply-to:in-reply-to:references:references;\n\tbh=Hd+gaM5AaJoJX7Kct1SnNrQY+YwFKTfTVThh//CGGs8=;\n\tb=dznW1x4Vjk5KXpCyKFgmD9EYyqMI1hSSlNPWusR6JYeYHC67rhAloHCJqON/4HP02i5P+C\n\t2tbKXMrAvqrkqD3qx1ZSTD2zHeJuEUW+zbs7P5+2BhOtieHowI246dwXGACnDBPsqOKWqw\n\tpR1AkSfyuGR30M4dOZKvCYx9JdeU6GE=", "X-MC-Unique": "TiPghNfSMYurVt22XIYetQ-1", "X-Mimecast-MFC-AGG-ID": "TiPghNfSMYurVt22XIYetQ_1774521994", "From": "David Howells <dhowells@redhat.com>", "To": "Christian Brauner <christian@brauner.io>,\n\tMatthew Wilcox <willy@infradead.org>,\n\tChristoph Hellwig <hch@infradead.org>", "Cc": "David Howells <dhowells@redhat.com>,\n\tPaulo Alcantara <pc@manguebit.com>,\n\tJens Axboe <axboe@kernel.dk>,\n\tLeon Romanovsky <leon@kernel.org>,\n\tSteve French <sfrench@samba.org>,\n\tChenXiaoSong <chenxiaosong@chenxiaosong.com>,\n\tMarc Dionne <marc.dionne@auristor.com>,\n\tEric Van Hensbergen <ericvh@kernel.org>,\n\tDominique Martinet <asmadeus@codewreck.org>,\n\tIlya Dryomov <idryomov@gmail.com>,\n\tTrond Myklebust <trondmy@kernel.org>,\n\tnetfs@lists.linux.dev,\n\tlinux-afs@lists.infradead.org,\n\tlinux-cifs@vger.kernel.org,\n\tlinux-nfs@vger.kernel.org,\n\tceph-devel@vger.kernel.org,\n\tv9fs@lists.linux.dev,\n\tlinux-erofs@lists.ozlabs.org,\n\tlinux-fsdevel@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tViacheslav Dubeyko <Slava.Dubeyko@ibm.com>,\n\tPaulo Alcantara <pc@manguebit.org>", "Subject": "[PATCH 03/26] netfs: fix VM_BUG_ON_FOLIO() issue in\n netfs_write_begin() call", "Date": "Thu, 26 Mar 2026 10:45:18 +0000", "Message-ID": "<20260326104544.509518-4-dhowells@redhat.com>", "In-Reply-To": "<20260326104544.509518-1-dhowells@redhat.com>", "References": "<20260326104544.509518-1-dhowells@redhat.com>", "Precedence": "bulk", "X-Mailing-List": "linux-cifs@vger.kernel.org", "List-Id": "<linux-cifs.vger.kernel.org>", "List-Subscribe": "<mailto:linux-cifs+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-cifs+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Scanned-By": "MIMEDefang 3.4.1 on 10.30.177.4" }, "content": "From: Viacheslav Dubeyko <Slava.Dubeyko@ibm.com>\n\nThe multiple runs of generic/013 test-case is capable\nto reproduce a kernel BUG at mm/filemap.c:1504 with\nprobability of 30%.\n\nwhile true; do\n sudo ./check generic/013\ndone\n\n[ 9849.452376] page: refcount:3 mapcount:0 mapping:00000000e58ff252 index:0x10781 pfn:0x1c322\n[ 9849.452412] memcg:ffff8881a1915800\n[ 9849.452417] aops:ceph_aops ino:1000058db9e dentry name(?):\"f9XXXXXX\"\n[ 9849.452432] flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)\n[ 9849.452441] raw: 0017ffffc0000000 0000000000000000 dead000000000122 ffff88816110d248\n[ 9849.452445] raw: 0000000000010781 0000000000000000 00000003ffffffff ffff8881a1915800\n[ 9849.452447] page dumped because: VM_BUG_ON_FOLIO(!folio_test_locked(folio))\n[ 9849.452474] ------------[ cut here ]------------\n[ 9849.452476] kernel BUG at mm/filemap.c:1504!\n[ 9849.478635] Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n[ 9849.481772] CPU: 2 UID: 0 PID: 84223 Comm: fsstress Not tainted 7.0.0-rc1+ #18 PREEMPT(full)\n[ 9849.482881] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-9.fc43 06/1\n0/2025\n[ 9849.484539] RIP: 0010:folio_unlock+0x85/0xa0\n[ 9849.485076] Code: 89 df 31 f6 e8 1c f3 ff ff 48 8b 5d f8 c9 31 c0 31 d2 31 f6 31 ff c3 cc\ncc cc cc 48 c7 c6 80 6c d9 a7 48 89 df e8 4b b3 10 00 <0f> 0b 48 89 df e8 21 e6 2c 00 eb 9d 0f 1f 40 00 66 66 2e 0f 1f 84\n[ 9849.493818] RSP: 0018:ffff8881bb8076b0 EFLAGS: 00010246\n[ 9849.495740] RAX: 0000000000000000 RBX: ffffea00070c8980 RCX: 0000000000000000\n[ 9849.498678] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\n[ 9849.500559] RBP: ffff8881bb8076b8 R08: 0000000000000000 R09: 0000000000000000\n[ 9849.501097] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000010782000\n[ 9849.502108] R13: ffff8881935de738 R14: ffff88816110d010 R15: 0000000000001000\n[ 9849.502516] FS: 00007e36cbe94740(0000) GS:ffff88824a899000(0000) knlGS:0000000000000000\n[ 9849.502996] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 9849.503810] CR2: 000000c0002b0000 CR3: 000000011bbf6004 CR4: 0000000000772ef0\n[ 9849.504459] PKRU: 55555554\n[ 9849.504626] Call Trace:\n[ 9849.505242] <TASK>\n[ 9849.505379] netfs_write_begin+0x7c8/0x10a0\n[ 9849.505877] ? __kasan_check_read+0x11/0x20\n[ 9849.506384] ? __pfx_netfs_write_begin+0x10/0x10\n[ 9849.507178] ceph_write_begin+0x8c/0x1c0\n[ 9849.507934] generic_perform_write+0x391/0x8f0\n[ 9849.508503] ? __pfx_generic_perform_write+0x10/0x10\n[ 9849.509062] ? file_update_time_flags+0x19a/0x4b0\n[ 9849.509581] ? ceph_get_caps+0x63/0xf0\n[ 9849.510259] ? ceph_get_caps+0x63/0xf0\n[ 9849.510530] ceph_write_iter+0xe79/0x1ae0\n[ 9849.511282] ? __pfx_ceph_write_iter+0x10/0x10\n[ 9849.511839] ? lock_acquire+0x1ad/0x310\n[ 9849.512334] ? ksys_write+0xf9/0x230\n[ 9849.512582] ? lock_is_held_type+0xaa/0x140\n[ 9849.513128] vfs_write+0x512/0x1110\n[ 9849.513634] ? __fget_files+0x33/0x350\n[ 9849.513893] ? __pfx_vfs_write+0x10/0x10\n[ 9849.514143] ? mutex_lock_nested+0x1b/0x30\n[ 9849.514394] ksys_write+0xf9/0x230\n[ 9849.514621] ? __pfx_ksys_write+0x10/0x10\n[ 9849.514887] ? do_syscall_64+0x25e/0x1520\n[ 9849.515122] ? __kasan_check_read+0x11/0x20\n[ 9849.515366] ? trace_hardirqs_on_prepare+0x178/0x1c0\n[ 9849.515655] __x64_sys_write+0x72/0xd0\n[ 9849.515885] ? trace_hardirqs_on+0x24/0x1c0\n[ 9849.516130] x64_sys_call+0x22f/0x2390\n[ 9849.516341] do_syscall_64+0x12b/0x1520\n[ 9849.516545] ? do_syscall_64+0x27c/0x1520\n[ 9849.516783] ? do_syscall_64+0x27c/0x1520\n[ 9849.517003] ? lock_release+0x318/0x480\n[ 9849.517220] ? __x64_sys_io_getevents+0x143/0x2d0\n[ 9849.517479] ? percpu_ref_put_many.constprop.0+0x8f/0x210\n[ 9849.517779] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[ 9849.518073] ? do_syscall_64+0x25e/0x1520\n[ 9849.518291] ? __kasan_check_read+0x11/0x20\n[ 9849.518519] ? trace_hardirqs_on_prepare+0x178/0x1c0\n[ 9849.518799] ? do_syscall_64+0x27c/0x1520\n[ 9849.519024] ? local_clock_noinstr+0xf/0x120\n[ 9849.519262] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[ 9849.519544] ? do_syscall_64+0x25e/0x1520\n[ 9849.519781] ? __kasan_check_read+0x11/0x20\n[ 9849.520008] ? trace_hardirqs_on_prepare+0x178/0x1c0\n[ 9849.520273] ? do_syscall_64+0x27c/0x1520\n[ 9849.520491] ? trace_hardirqs_on_prepare+0x178/0x1c0\n[ 9849.520767] ? irqentry_exit+0x10c/0x6c0\n[ 9849.520984] ? trace_hardirqs_off+0x86/0x1b0\n[ 9849.521224] ? exc_page_fault+0xab/0x130\n[ 9849.521472] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[ 9849.521766] RIP: 0033:0x7e36cbd14907\n[ 9849.521989] Code: 10 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24\n[ 9849.523057] RSP: 002b:00007ffff2d2a968 EFLAGS: 00000246 ORIG_RAX: 0000000000000001\n[ 9849.523484] RAX: ffffffffffffffda RBX: 000000000000e549 RCX: 00007e36cbd14907\n[ 9849.523885] RDX: 000000000000e549 RSI: 00005bd797ec6370 RDI: 0000000000000004\n[ 9849.524277] RBP: 0000000000000004 R08: 0000000000000047 R09: 00005bd797ec6370\n[ 9849.524652] R10: 0000000000000078 R11: 0000000000000246 R12: 0000000000000049\n[ 9849.525062] R13: 0000000010781a37 R14: 00005bd797ec6370 R15: 0000000000000000\n[ 9849.525447] </TASK>\n[ 9849.525574] Modules linked in: intel_rapl_msr intel_rapl_common intel_uncore_frequency_common intel_pmc_core pmt_telemetry pmt_discovery pmt_class intel_pmc_ssram_telemetry intel_vsec kvm_intel joydev kvm irqbypass ghash_clmulni_intel aesni_intel input_leds rapl mac_hid psmouse vga16fb serio_raw vgastate floppy i2c_piix4 bochs qemu_fw_cfg i2c_smbus pata_acpi sch_fq_codel rbd msr parport_pc ppdev lp parport efi_pstore\n[ 9849.529150] ---[ end trace 0000000000000000 ]---\n[ 9849.529502] RIP: 0010:folio_unlock+0x85/0xa0\n[ 9849.530813] Code: 89 df 31 f6 e8 1c f3 ff ff 48 8b 5d f8 c9 31 c0 31 d2 31 f6 31 ff c3 cc cc cc cc 48 c7 c6 80 6c d9 a7 48 89 df e8 4b b3 10 00 <0f> 0b 48 89 df e8 21 e6 2c 00 eb 9d 0f 1f 40 00 66 66 2e 0f 1f 84\n[ 9849.534986] RSP: 0018:ffff8881bb8076b0 EFLAGS: 00010246\n[ 9849.536198] RAX: 0000000000000000 RBX: ffffea00070c8980 RCX: 0000000000000000\n[ 9849.537718] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\n[ 9849.539321] RBP: ffff8881bb8076b8 R08: 0000000000000000 R09: 0000000000000000\n[ 9849.540862] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000010782000\n[ 9849.542438] R13: ffff8881935de738 R14: ffff88816110d010 R15: 0000000000001000\n[ 9849.543996] FS: 00007e36cbe94740(0000) GS:ffff88824b899000(0000) knlGS:0000000000000000\n[ 9849.545854] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 9849.547092] CR2: 00007e36cb3ff000 CR3: 000000011bbf6006 CR4: 0000000000772ef0\n[ 9849.548679] PKRU: 55555554\n\nThe race sequence:\n1. Read completes -> netfs_read_collection() runs\n2. netfs_wake_rreq_flag(rreq, NETFS_RREQ_IN_PROGRESS, ...)\n3. netfs_wait_for_read() returns -EFAULT to netfs_write_begin()\n4. The netfs_unlock_abandoned_read_pages() unlocks the folio\n5. netfs_write_begin() calls folio_unlock(folio) -> VM_BUG_ON_FOLIO()\n\nThe key reason of the issue that netfs_unlock_abandoned_read_pages()\ndoesn't check the flag NETFS_RREQ_NO_UNLOCK_FOLIO and executes\nfolio_unlock() unconditionally. This patch implements in\nnetfs_unlock_abandoned_read_pages() logic similar to\nnetfs_unlock_read_folio().\n\nSigned-off-by: Viacheslav Dubeyko <Slava.Dubeyko@ibm.com>\ncc: David Howells <dhowells@redhat.com>\ncc: Paulo Alcantara <pc@manguebit.org>\ncc: netfs@lists.linux.dev\ncc: linux-fsdevel@vger.kernel.org\ncc: Ceph Development <ceph-devel@vger.kernel.org>\nSigned-off-by: David Howells <dhowells@redhat.com>\n---\n fs/netfs/read_retry.c | 11 +++++++++--\n 1 file changed, 9 insertions(+), 2 deletions(-)", "diff": "diff --git a/fs/netfs/read_retry.c b/fs/netfs/read_retry.c\nindex 7793ba5e3e8f..71a0c7ed163a 100644\n--- a/fs/netfs/read_retry.c\n+++ b/fs/netfs/read_retry.c\n@@ -285,8 +285,15 @@ void netfs_unlock_abandoned_read_pages(struct netfs_io_request *rreq)\n \t\t\tstruct folio *folio = folioq_folio(p, slot);\n \n \t\t\tif (folio && !folioq_is_marked2(p, slot)) {\n-\t\t\t\ttrace_netfs_folio(folio, netfs_folio_trace_abandon);\n-\t\t\t\tfolio_unlock(folio);\n+\t\t\t\tif (folio->index == rreq->no_unlock_folio &&\n+\t\t\t\t test_bit(NETFS_RREQ_NO_UNLOCK_FOLIO,\n+\t\t\t\t\t &rreq->flags)) {\n+\t\t\t\t\t_debug(\"no unlock\");\n+\t\t\t\t} else {\n+\t\t\t\t\ttrace_netfs_folio(folio,\n+\t\t\t\t\t\tnetfs_folio_trace_abandon);\n+\t\t\t\t\tfolio_unlock(folio);\n+\t\t\t\t}\n \t\t\t}\n \t\t}\n \t}\n", "prefixes": [ "03/26" ] }