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b=MApBI3CUCJ7yOsNwFQf/FaeOmO6y0wpdKU6JLaMIz+fXNW29HVbs4B2+42tDYAbs/ d7M9sSYf8ZqW3FhQsTXpJgtLBPZDu9wnIpw0pPllaiNXIb7JqOdO1jElHEPN1bVNvc 5pKaVdZrnQfJVzXWqT2K3AY9UXTDCzgFKi6JMbssI3TrB+f5RKpk9DE8ueJcpggPE0 2Guz1ZuhT47MfBGa07+hMfITa9ARWxfL7RoVB9tVIIvOfl7X1J/144DuGE8D1xYEH3 pxufjfti2O1KnePwOXW6YkDX4NELrvYCiDpk27KPpbFyDzF1H2oV0SPH9D5Hqk8RdG GbJpJX4RLxSXQ== Received: by macsyma.thunk.org (Postfix, from userid 15806) id 31EF34C85C03; Mon, 24 Nov 2025 13:18:11 -0600 (CST) Date: Mon, 24 Nov 2025 13:18:11 -0600 From: "Theodore Tso" To: Matthew Wilcox Cc: linux-mm@kvack.org, Ext4 Developers List , linux-xfs@vger.kernel.org Subject: [REGRESSION] generic/127 failure caused by "mm: Use folio_next_pos()" Message-ID: <20251124191811.GA26781@mac.lan> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="NWlW6uYnq158lPXA" Content-Disposition: inline X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 4C419C000E X-Stat-Signature: 5zczxn77dw5no9akfgq9f11d3he4gw61 X-HE-Tag: 1764011903-368295 X-HE-Meta: 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 r2GGgf7+ 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 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: --NWlW6uYnq158lPXA Content-Type: text/plain; charset=us-ascii Content-Disposition: inline While testing the ext4 large blocksize patches I merged in linux-next/fs-next to pick up the mm changes needed to prevent the warnings when allocating larger blocks with GFP_NOFAIL, and I found some unrelated regressions with three tests, including generic/127 (the other two regressions seem unrelated to this commit; I'll bisect them separately). Further testing found that regression occurred somewhere between fs-current and fs-next, and I also found that it was failing not just for ext4, but also for ext4. A git bisect run localized the failure to this commit: commit 60a70e61430b2d568bc5e96f629c5855ee159ace Author: Matthew Wilcox (Oracle) Date: Fri Oct 24 18:08:18 2025 +0100 mm: Use folio_next_pos() This is one instruction more efficient than open-coding folio_pos() + folio_size(). It's the equivalent of (x + y) << z rather than x << z + y << z. Signed-off-by: Matthew Wilcox (Oracle) Link: https://patch.msgid.link/20251024170822.1427218-11-willy@infradead.org I then checked out linux-next (aka linux-next/master) and verified that the problem was reproducible there, using kvm-xfstests -c ext4/4k generic/127 --fail-loop-count 0 --kernel-build And then when I reverted commit 60a70e61430b, the test passed. I also checked and found that this commit was also causing generic/127 to fail for xfs: kvm-xfstests -c xfs/4k generic/127 --fail-loop-count 0 --kernel-build And, with the commit reverted the problem went away. The test logs for ext4 and xfs are attached. Willy, could you take a look? Many thanks!! - Ted --NWlW6uYnq158lPXA Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename=ext4-generic-127.log Content-Transfer-Encoding: quoted-printable =1Bc=1B[?7l=1B[2J=1B[0mSeaBIOS (version 1.17.0-debian-1.17.0-1)=0D Booting from ROM..=1Bc=1B[?7l=1B[2J=1B[!p=1B]104=07=1B[?7h[=1B[0;1;31mFAILE= D=1B[0m] Failed to start =1B[0;1;39mnbd-server.service=1B[0m - Network Bloc= k Device server.=0D=0D CMDLINE: "-c ext4/4k generic/127 --fail-loop-count 0"=0D KERNEL: kernel 6.18.0-rc6-next-20251124-xfstests #20 SMP PREEMPT_DYNAMIC Mo= n Nov 24 14:04:48 EST 2025 x86_64=0D FSTESTVER: blktests 4badb27 (Fri, 31 Oct 2025 19:53:27 +0900)=0D FSTESTVER: fio fio-3.41 (Fri, 5 Sep 2025 14:21:17 -0600)=0D FSTESTVER: fsverity v1.7 (Tue, 4 Nov 2025 17:28:17 -0800)=0D FSTESTVER: ima-evm-utils v1.5 (Mon, 6 Mar 2023 07:40:07 -0500)=0D FSTESTVER: libaio libaio-0.3.108-82-gb8eadc9 (Thu, 2 Jun 2022 13:33:11 +0= 200)=0D FSTESTVER: ltp 20250930 (Tue, 30 Sep 2025 13:53:45 +0200)=0D FSTESTVER: quota v4.05-77-g22ff3d9 (Tue, 2 Sep 2025 08:12:02 -0400)=0D FSTESTVER: util-linux v2.41.2 (Mon, 22 Sep 2025 12:56:34 +0200)=0D FSTESTVER: xfsprogs v6.17.0 (Mon, 20 Oct 2025 16:49:00 +0200)=0D FSTESTVER: xfstests v2025.11.04-12-g64e3dbda7 (Thu, 13 Nov 2025 19:58:03 -0= 500)=0D FSTESTVER: xfstests-bld gce-xfstests-202504292206-33-g3844cb58 (Thu, 13 Nov= 2025 21:05:49 -0500)=0D FSTESTVER: zz_build-distro trixie=0D FSTESTCFG: "ext4/4k"=0D FSTESTSET: "generic/127"=0D FSTESTEXC: ""=0D FSTESTOPT: "fail_loop_count 0 aex"=0D MNTOPTS: ""=0D CPUS: "2"=0D MEM: "1969.56"=0D total used free shared buff/cache avai= lable=0D Mem: 1969 208 1749 0 143 = 1760=0D Swap: 0 0 0=0D BEGIN TEST 4k (1 test): Ext4 4k block Mon Nov 24 14:05:27 EST 2025=0D DEVICE: /dev/vdb=0D EXT_MKFS_OPTIONS: -b 4096=0D EXT_MOUNT_OPTIONS: -o block_validity=0D FSTYP -- ext4=0D PLATFORM -- Linux/x86_64 kvm-xfstests 6.18.0-rc6-next-20251124-xfstest= s #20 SMP PREEMPT_DYNAMIC Mon Nov 24 14:04:48 EST 2025=0D MKFS_OPTIONS -- -F -q -b 4096 /dev/vdc=0D MOUNT_OPTIONS -- -o acl,user_xattr -o block_validity /dev/vdc /vdc=0D =0D generic/127 31s ... [14:05:28][ 3.901891] run fstests generic/127 at 2= 025-11-24 14:05:28=0D [ 4.092040] EXT4-fs warning (device vdb): ext4_convert_unwritten_extents= _endio:3774: Inode (42) finished: extent logical block 25, len 15; IO logic= al block 25, len 8=0D [ 4.101284] EXT4-fs warning (device vdb): ext4_convert_unwritten_extents= _endio:3774: Inode (47) finished: extent logical block 25, len 15; IO logic= al block 25, len 8=0D [ 4.125984] EXT4-fs warning (device vdb): ext4_convert_unwritten_extents= _endio:3774: Inode (47) finished: extent logical block 35, len 9; IO logica= l block 39, len 1=0D [ 4.129140] EXT4-fs warning (device vdb): ext4_convert_unwritten_extents= _endio:3774: Inode (47) finished: extent logical block 35, len 4; IO logica= l block 36, len 3=0D [ 4.181406] EXT4-fs warning (device vdb): ext4_convert_unwritten_extents= _endio:3774: Inode (42) finished: extent logical block 3, len 14; IO logica= l block 8, len 9=0D [ 4.194278] EXT4-fs warning (device vdb): ext4_convert_unwritten_extents= _endio:3774: Inode (42) finished: extent logical block 31, len 11; IO logic= al block 31, len 10=0D [ 4.198459] EXT4-fs warning (device vdb): ext4_convert_unwritten_extents= _endio:3774: Inode (47) finished: extent logical block 3, len 14; IO logica= l block 8, len 9=0D [ 4.207676] EXT4-fs warning (device vdb): ext4_convert_unwritten_extents= _endio:3774: Inode (50) finished: extent logical block 25, len 15; IO logic= al block 25, len 8=0D [ 4.217111] EXT4-fs warning (device vdb): ext4_convert_unwritten_extents= _endio:3774: Inode (47) finished: extent logical block 31, len 11; IO logic= al block 31, len 10=0D [ 4.221635] EXT4-fs warning (device vdb): ext4_convert_unwritten_extents= _endio:3774: Inode (41) finished: extent logical block 25, len 15; IO logic= al block 25, len 8=0D [14:05:39]- output mismatch (see /results/ext4/results-4k/generic/127.out.= bad)=0D --- tests/generic/127.out 2025-11-13 21:05:49.000000000 -0500=0D +++ /results/ext4/results-4k/generic/127.out.bad 2025-11-24 14:05:39.22= 5714867 -0500=0D @@ -1,7 +1,34117 @@=0D QA output created by 127=0D +/root/xfstests/ltp/fsx -q -l 262144 -o 65536 -S 191110531 -N 100000 -R= -W fsx_std_nommap=0D +READ BAD DATA: offset =3D 0x11303, size =3D 0xf7b0, fname =3D /vdb/fsx= _std_nommap=0D +OFFSET GOOD BAD RANGE=0D +0x14000 0x0000 0xfc9f 0x0=0D +operation# (mod 256) for the bad data may be 252=0D +0x14001 0x0000 0x9ffc 0x1=0D ...=0D (Run 'diff -u /root/xfstests/tests/generic/127.out /results/ext4/result= s-4k/generic/127.out.bad' to see the entire diff)=0D Ran: generic/127=0D Failures: generic/127=0D Failed 1 of 1 tests=0D Xunit report: /results/ext4/results-4k/result.xml=0D =0D total used free shared buff/cache avai= lable=0D Mem: 1969 206 1822 0 28 = 1762=0D Swap: 0 0 0=0D END TEST: Ext4 4k block Mon Nov 24 14:05:39 EST 2025=0D --NWlW6uYnq158lPXA Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename=xfs-generic-127.log Content-Transfer-Encoding: quoted-printable =1Bc=1B[?7l=1B[2J=1B[0mSeaBIOS (version 1.17.0-debian-1.17.0-1)=0D Booting from ROM..=1Bc=1B[?7l=1B[2J=1B[!p=1B]104=07=1B[?7h[=1B[0;1;31mFAILE= D=1B[0m] Failed to start =1B[0;1;39mnbd-server.service=1B[0m - Network Bloc= k Device server.=0D=0D CMDLINE: "-c xfs/4k generic/127 --fail-loop-count 0"=0D KERNEL: kernel 6.18.0-rc6-next-20251124-xfstests #20 SMP PREEMPT_DYNAMIC Mo= n Nov 24 14:04:48 EST 2025 x86_64=0D FSTESTVER: blktests 4badb27 (Fri, 31 Oct 2025 19:53:27 +0900)=0D FSTESTVER: fio fio-3.41 (Fri, 5 Sep 2025 14:21:17 -0600)=0D FSTESTVER: fsverity v1.7 (Tue, 4 Nov 2025 17:28:17 -0800)=0D FSTESTVER: ima-evm-utils v1.5 (Mon, 6 Mar 2023 07:40:07 -0500)=0D FSTESTVER: libaio libaio-0.3.108-82-gb8eadc9 (Thu, 2 Jun 2022 13:33:11 +0= 200)=0D FSTESTVER: ltp 20250930 (Tue, 30 Sep 2025 13:53:45 +0200)=0D FSTESTVER: quota v4.05-77-g22ff3d9 (Tue, 2 Sep 2025 08:12:02 -0400)=0D FSTESTVER: util-linux v2.41.2 (Mon, 22 Sep 2025 12:56:34 +0200)=0D FSTESTVER: xfsprogs v6.17.0 (Mon, 20 Oct 2025 16:49:00 +0200)=0D FSTESTVER: xfstests v2025.11.04-12-g64e3dbda7 (Thu, 13 Nov 2025 19:58:03 -0= 500)=0D FSTESTVER: xfstests-bld gce-xfstests-202504292206-33-g3844cb58 (Thu, 13 Nov= 2025 21:05:49 -0500)=0D FSTESTVER: zz_build-distro trixie=0D FSTESTCFG: "xfs/4k"=0D FSTESTSET: "generic/127"=0D FSTESTEXC: ""=0D FSTESTOPT: "fail_loop_count 0 aex"=0D MNTOPTS: ""=0D CPUS: "2"=0D MEM: "1969.56"=0D total used free shared buff/cache avai= lable=0D Mem: 1969 212 1745 0 143 = 1756=0D Swap: 0 0 0=0D meta-data=3D/dev/vdd isize=3D512 agcount=3D4, agsize=3D327= 680 blks=0D =3D sectsz=3D512 attr=3D2, projid32bit=3D1= =0D =3D crc=3D1 finobt=3D1, sparse=3D1, r= mapbt=3D1=0D =3D reflink=3D1 bigtime=3D1 inobtcount=3D= 1 nrext64=3D1=0D =3D exchange=3D0 metadir=3D0=0D data =3D bsize=3D4096 blocks=3D1310720, imaxpct= =3D25=0D =3D sunit=3D0 swidth=3D0 blks=0D naming =3Dversion 2 bsize=3D4096 ascii-ci=3D0, ftype=3D1, = parent=3D0=0D log =3Dinternal log bsize=3D4096 blocks=3D16384, version= =3D2=0D =3D sectsz=3D512 sunit=3D0 blks, lazy-coun= t=3D1=0D realtime =3Dnone extsz=3D4096 blocks=3D0, rtextents=3D0= =0D =3D rgcount=3D0 rgsize=3D0 extents=0D =3D zoned=3D0 start=3D0 reserved=3D0=0D Discarding blocks...Done.=0D BEGIN TEST 4k (1 test): XFS 4k block Mon Nov 24 14:06:31 EST 2025=0D DEVICE: /dev/vdd=0D XFS_MKFS_OPTIONS: -bsize=3D4096=0D XFS_MOUNT_OPTIONS: =0D FSTYP -- xfs (debug)=0D PLATFORM -- Linux/x86_64 kvm-xfstests 6.18.0-rc6-next-20251124-xfstest= s #20 SMP PREEMPT_DYNAMIC Mon Nov 24 14:04:48 EST 2025=0D MKFS_OPTIONS -- -f -bsize=3D4096 /dev/vdc=0D MOUNT_OPTIONS -- /dev/vdc /vdc=0D =0D generic/127 31s ... [14:06:33][ 6.886269] run fstests generic/127 at 2= 025-11-24 14:06:33=0D [ 7.333668] vdd: writeback error on inode 137, offset 208896, sector 262= 2528=0D [ 7.338078] XFS (vdd): Corruption of in-memory data (0x8) detected at xf= s_trans_mod_sb+0x2b6/0x370 (fs/xfs/xfs_trans.c:353). Shutting down filesys= tem.=0D [ 7.341384] XFS (vdd): Please unmount the filesystem and rectify the pro= blem(s)=0D [ 7.342570] XFS: Assertion failed: tp->t_blk_res >=3D tp->t_blk_res_used= , file: fs/xfs/xfs_trans.c, line: 120=0D [ 7.344123] ------------[ cut here ]------------=0D [ 7.344851] WARNING: fs/xfs/xfs_message.c:104 at assfail+0x33/0x3a, CPU#= 1: kworker/1:0/23=0D [ 7.346172] CPU: 1 UID: 0 PID: 23 Comm: kworker/1:0 Not tainted 6.18.0-r= c6-next-20251124-xfstests #20 PREEMPT(none) =0D [ 7.347861] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.1= 7.0-debian-1.17.0-1 04/01/2014=0D [ 7.349936] Workqueue: xfs-conv/vdd xfs_end_io=0D [ 7.350759] RIP: 0010:assfail+0x33/0x3a=0D [ 7.351341] Code: 49 89 d0 41 89 c9 48 c7 c2 d8 18 a8 82 48 89 f1 48 89 = fe 48 c7 c7 e4 0c b0 82 e8 b8 fd ff ff 80 3d 59 6d ba 01 00 74 02 0f 0b <0f= > 0b e9 41 da ed ff 48 8d 45 10 48 89 e2 48 89 de 4c 89 34 24 48=0D [ 7.354327] RSP: 0018:ffa00000000cbc00 EFLAGS: 00010246=0D [ 7.355161] RAX: 0000000000000000 RBX: ff11000011dafbc8 RCX: 000000007ff= fffff=0D [ 7.356328] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff82b= 00ce4=0D [ 7.357522] RBP: ff11000011dafd98 R08: 0000000000000000 R09: 00000000000= 0000a=0D [ 7.358681] R10: 000000000000000a R11: 0fffffffffffffff R12: 00000005000= 2f3f8=0D [ 7.359835] R13: 0000000000039a46 R14: ff11000011dafe68 R15: ff11000011d= afe68=0D [ 7.361031] FS: 0000000000000000(0000) GS:ff110000fa430000(0000) knlGS:= 0000000000000000=0D [ 7.362325] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033=0D [ 7.363273] CR2: 00007fbb37aaa350 CR3: 0000000002c2e003 CR4: 00000000007= 71ef0=0D [ 7.364422] PKRU: 55555554=0D [ 7.364872] Call Trace:=0D [ 7.365309] =0D [ 7.365671] xfs_trans_dup+0x16e/0x1c0=0D [ 7.366287] xfs_trans_roll+0x2e/0xd0=0D [ 7.366906] xfs_defer_trans_roll+0x53/0x130=0D [ 7.367608] ? srso_alias_return_thunk+0x5/0xfbef5=0D [ 7.368393] xfs_defer_finish_noroll+0x2cd/0x500=0D [ 7.369419] xfs_trans_commit+0x4c/0x70=0D [ 7.370486] ? xfs_iomap_write_unwritten+0x180/0x320=0D [ 7.371227] xfs_iomap_write_unwritten+0xce/0x320=0D [ 7.371932] xfs_end_ioend+0x207/0x2b0=0D [ 7.372517] xfs_end_io+0xb5/0x100=0D [ 7.373046] process_one_work+0x18c/0x360=0D [ 7.373697] worker_thread+0x268/0x3b0=0D [ 7.374265] ? __pfx_worker_thread+0x10/0x10=0D [ 7.374910] kthread+0x10a/0x230=0D [ 7.375422] ? __pfx_kthread+0x10/0x10=0D [ 7.375989] ? __pfx_kthread+0x10/0x10=0D [ 7.376577] ret_from_fork+0x95/0x110=0D [ 7.377142] ? __pfx_kthread+0x10/0x10=0D [ 7.377709] ret_from_fork_asm+0x1a/0x30=0D [ 7.378303] =0D [ 7.378663] ---[ end trace 0000000000000000 ]---=0D [ 7.379365] vdd: writeback error on inode 132, offset 184320, sector 888= =0D _check_xfs_filesystem: filesystem on /dev/vdd has dirty log=0D (see /results/xfs/results-4k/generic/127.full for details)=0D _check_xfs_filesystem: filesystem on /dev/vdd is inconsistent (r)=0D (see /results/xfs/results-4k/generic/127.full for details)=0D Trying to repair broken TEST_DEV file system=0D _check_dmesg: something found in dmesg (see /results/xfs/results-4k/generic= /127.dmesg)=0D [14:06:34]- output mismatch (see /results/xfs/results-4k/generic/127.out.b= ad)=0D --- tests/generic/127.out 2025-11-13 21:05:49.000000000 -0500=0D +++ /results/xfs/results-4k/generic/127.out.bad 2025-11-24 14:06:34.037= 856472 -0500=0D @@ -1,7 +1,25950 @@=0D QA output created by 127=0D -All 100000 operations completed A-OK!=0D -All 100000 operations completed A-OK!=0D -All 100000 operations completed A-OK!=0D -All 100000 operations completed A-OK!=0D -All 100000 operations completed A-OK!=0D -All 100000 operations completed A-OK!=0D ...=0D (Run 'diff -u /root/xfstests/tests/generic/127.out /results/xfs/results= -4k/generic/127.out.bad' to see the entire diff)=0D Ran: generic/127=0D Failures: generic/127=0D Failed 1 of 1 tests=0D Xunit report: /results/xfs/results-4k/result.xml=0D =0D total used free shared buff/cache avai= lable=0D Mem: 1969 309 1719 0 30 = 1660=0D Swap: 0 0 0=0D END TEST: XFS 4k block Mon Nov 24 14:06:34 EST 2025=0D --NWlW6uYnq158lPXA--