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Fri, 08 Aug 2025 09:52:35 +0200 Message-ID: <9b650a52-9672-4604-a765-bb6be55d1e4a@gmx.com> Date: Fri, 8 Aug 2025 17:22:32 +0930 Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: linux-ext4 , linux-btrfs , "linux-fsdevel@vger.kernel.org" From: Qu Wenruo Subject: Ext4 iomap warning during btrfs/136 (yes, it's from btrfs test cases) Autocrypt: addr=quwenruo.btrfs@gmx.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNIlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT7CwJQEEwEIAD4CGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCZxF1YAUJEP5a sQAKCRDCPZHzoSX+qF+mB/9gXu9C3BV0omDZBDWevJHxpWpOwQ8DxZEbk9b9LcrQlWdhFhyn xi+l5lRziV9ZGyYXp7N35a9t7GQJndMCFUWYoEa+1NCuxDs6bslfrCaGEGG/+wd6oIPb85xo naxnQ+SQtYLUFbU77WkUPaaIU8hH2BAfn9ZSDX9lIxheQE8ZYGGmo4wYpnN7/hSXALD7+oun tZljjGNT1o+/B8WVZtw/YZuCuHgZeaFdhcV2jsz7+iGb+LsqzHuznrXqbyUQgQT9kn8ZYFNW 7tf+LNxXuwedzRag4fxtR+5GVvJ41Oh/eygp8VqiMAtnFYaSlb9sjia1Mh+m+OBFeuXjgGlG VvQFzsBNBFnVga8BCACqU+th4Esy/c8BnvliFAjAfpzhI1wH76FD1MJPmAhA3DnX5JDORcga CbPEwhLj1xlwTgpeT+QfDmGJ5B5BlrrQFZVE1fChEjiJvyiSAO4yQPkrPVYTI7Xj34FnscPj /IrRUUka68MlHxPtFnAHr25VIuOS41lmYKYNwPNLRz9Ik6DmeTG3WJO2BQRNvXA0pXrJH1fN GSsRb+pKEKHKtL1803x71zQxCwLh+zLP1iXHVM5j8gX9zqupigQR/Cel2XPS44zWcDW8r7B0 q1eW4Jrv0x19p4P923voqn+joIAostyNTUjCeSrUdKth9jcdlam9X2DziA/DHDFfS5eq4fEv ABEBAAHCwHwEGAEIACYCGwwWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCZxF1gQUJEP5a0gAK CRDCPZHzoSX+qHGpB/kB8A7M7KGL5qzat+jBRoLwB0Y3Zax0QWuANVdZM3eJDlKJKJ4HKzjo B2Pcn4JXL2apSan2uJftaMbNQbwotvabLXkE7cPpnppnBq7iovmBw++/d8zQjLQLWInQ5kNq Vmi36kmq8o5c0f97QVjMryHlmSlEZ2Wwc1kURAe4lsRG2dNeAd4CAqmTw0cMIrR6R/Dpt3ma +8oGXJOmwWuDFKNV4G2XLKcghqrtcRf2zAGNogg3KulCykHHripG3kPKsb7fYVcSQtlt5R6v HZStaZBzw4PcDiaAF3pPDBd+0fIKS6BlpeNRSFG94RYrt84Qw77JWDOAZsyNfEIEE0J6LSR/ Content-Type: text/plain; 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Currently btrfs is artificially limiting subpage block size to 4K. But there is a simple patch to change it to support all block sizes <=3D= =20 page size in my branch: https://github.com/adam900710/linux/tree/larger_bs_support [IOMAP WARNING] And I'm running into a very weird kernel warning at btrfs/136, with 16K=20 block size and 64K page size. The problem is, the problem happens with ext3 (using ext4 modeule) with=20 16K block size, and no btrfs is involved yet. The test case btrfs/136 create an ext3 fs first, using the same block=20 size of the btrfs on TEST_DEV (so it's 16K). Then populate the fs. The hang happens at the ext3 populating part, with the following kernel=20 warning: [ 989.664270] run fstests btrfs/136 at 2025-08-08 16:57:37 [ 990.551395] EXT4-fs (dm-3): mounting ext3 file system using the ext4=20 subsystem [ 990.554980] EXT4-fs (dm-3): mounted filesystem=20 d90f4325-e6a6-4787-9da8-150ece277a94 r/w with ordered data mode. Quota=20 mode: none. [ 990.581540] ------------[ cut here ]------------ [ 990.581551] WARNING: CPU: 3 PID: 434101 at fs/iomap/iter.c:34=20 iomap_iter_done+0x148/0x190 [ 990.583497] Modules linked in: dm_flakey nls_ascii nls_cp437 vfat fat= =20 btrfs polyval_ce ghash_ce rtc_efi processor xor xor_neon raid6_pq=20 zstd_compress fuse loop nfnetlink qemu_fw_cfg ext4 crc16 mbcache jbd2=20 dm_mod xhci_pci xhci_hcd virtio_net virtio_scsi net_failover failover=20 virtio_console virtio_balloon virtio_blk virtio_mmio [ 990.587247] CPU: 3 UID: 0 PID: 434101 Comm: fsstress Not tainted=20 6.16.0-rc7-custom+ #128 PREEMPT(voluntary) [ 990.588525] Hardware name: QEMU KVM Virtual Machine, BIOS unknown=20 2/2/2022 [ 990.589414] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS=20 BTYPE=3D--) [ 990.590314] pc : iomap_iter_done+0x148/0x190 [ 990.590874] lr : iomap_iter+0x174/0x230 [ 990.591370] sp : ffff8000880af740 [ 990.591800] x29: ffff8000880af740 x28: ffff0000db8e6840 x27:=20 0000000000000000 [ 990.592716] x26: 0000000000000000 x25: ffff8000880af830 x24:=20 0000004000000000 [ 990.593631] x23: 0000000000000002 x22: 000001bfdbfa8000 x21:=20 ffffa6a41c002e48 [ 990.594549] x20: 0000000000000001 x19: ffff8000880af808 x18:=20 0000000000000000 [ 990.595464] x17: 0000000000000000 x16: ffffa6a495ee6cd0 x15:=20 0000000000000000 [ 990.596379] x14: 00000000000003d4 x13: 00000000fa83b2da x12:=20 0000b236fc95f18c [ 990.597295] x11: ffffa6a4978b9c08 x10: 0000000000001da0 x9 :=20 ffffa6a41c1a2a44 [ 990.598210] x8 : ffff8000880af5c8 x7 : 0000000001000000 x6 :=20 0000000000000000 [ 990.599125] x5 : 0000000000000004 x4 : 000001bfdbfa8000 x3 :=20 0000000000000000 [ 990.600040] x2 : 0000000000000000 x1 : 0000004004030000 x0 :=20 0000000000000000 [ 990.600955] Call trace: [ 990.601273] iomap_iter_done+0x148/0x190 (P) [ 990.601829] iomap_iter+0x174/0x230 [ 990.602280] iomap_fiemap+0x154/0x1d8 [ 990.602751] ext4_fiemap+0x110/0x140 [ext4] [ 990.603350] do_vfs_ioctl+0x4b8/0xbc0 [ 990.603831] __arm64_sys_ioctl+0x8c/0x120 [ 990.604346] invoke_syscall+0x6c/0x100 [ 990.604836] el0_svc_common.constprop.0+0x48/0xf0 [ 990.605444] do_el0_svc+0x24/0x38 [ 990.605875] el0_svc+0x38/0x120 [ 990.606283] el0t_64_sync_handler+0x10c/0x138 [ 990.606846] el0t_64_sync+0x198/0x1a0 [ 990.607319] ---[ end trace 0000000000000000 ]--- [ 990.608042] ------------[ cut here ]------------ [ 990.608047] WARNING: CPU: 3 PID: 434101 at fs/iomap/iter.c:35=20 iomap_iter_done+0x164/0x190 [ 990.610842] Modules linked in: dm_flakey nls_ascii nls_cp437 vfat fat= =20 btrfs polyval_ce ghash_ce rtc_efi processor xor xor_neon raid6_pq=20 zstd_compress fuse loop nfnetlink qemu_fw_cfg ext4 crc16 mbcache jbd2=20 dm_mod xhci_pci xhci_hcd virtio_net virtio_scsi net_failover failover=20 virtio_console virtio_balloon virtio_blk virtio_mmio [ 990.619189] CPU: 3 UID: 0 PID: 434101 Comm: fsstress Tainted: G=20 W 6.16.0-rc7-custom+ #128 PREEMPT(voluntary) [ 990.620876] Tainted: [W]=3DWARN [ 990.621458] Hardware name: QEMU KVM Virtual Machine, BIOS unknown=20 2/2/2022 [ 990.622507] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS=20 BTYPE=3D--) [ 990.623911] pc : iomap_iter_done+0x164/0x190 [ 990.624936] lr : iomap_iter+0x174/0x230 [ 990.626747] sp : ffff8000880af740 [ 990.627404] x29: ffff8000880af740 x28: ffff0000db8e6840 x27:=20 0000000000000000 [ 990.628947] x26: 0000000000000000 x25: ffff8000880af830 x24:=20 0000004000000000 [ 990.631024] x23: 0000000000000002 x22: 000001bfdbfa8000 x21:=20 ffffa6a41c002e48 [ 990.632278] x20: 0000000000000001 x19: ffff8000880af808 x18:=20 0000000000000000 [ 990.634189] x17: 0000000000000000 x16: ffffa6a495ee6cd0 x15:=20 0000000000000000 [ 990.635608] x14: 00000000000003d4 x13: 00000000fa83b2da x12:=20 0000b236fc95f18c [ 990.637854] x11: ffffa6a4978b9c08 x10: 0000000000001da0 x9 :=20 ffffa6a41c1a2a44 [ 990.639181] x8 : ffff8000880af5c8 x7 : 0000000001000000 x6 :=20 0000000000000000 [ 990.642370] x5 : 0000000000000004 x4 : 000001bfdbfa8000 x3 :=20 0000000000000000 [ 990.644505] x2 : 0000004004030000 x1 : 0000004004030000 x0 :=20 0000004004030000 [ 990.645493] Call trace: [ 990.645841] iomap_iter_done+0x164/0x190 (P) [ 990.646377] iomap_iter+0x174/0x230 [ 990.647550] iomap_fiemap+0x154/0x1d8 [ 990.648052] ext4_fiemap+0x110/0x140 [ext4] [ 990.649061] do_vfs_ioctl+0x4b8/0xbc0 [ 990.649704] __arm64_sys_ioctl+0x8c/0x120 [ 990.652141] invoke_syscall+0x6c/0x100 [ 990.653001] el0_svc_common.constprop.0+0x48/0xf0 [ 990.653909] do_el0_svc+0x24/0x38 [ 990.654332] el0_svc+0x38/0x120 [ 990.654736] el0t_64_sync_handler+0x10c/0x138 [ 990.655295] el0t_64_sync+0x198/0x1a0 [ 990.655761] ---[ end trace 0000000000000000 ]--- Considering it's not yet btrfs, and the call trace is from iomap, I=20 guess there is something wrong with ext4's ext3 support? The involved ext4 kernel configs are the following: # CONFIG_EXT2_FS is not set # CONFIG_EXT3_FS is not set CONFIG_EXT4_FS=3Dm CONFIG_EXT4_USE_FOR_EXT2=3Dy CONFIG_EXT4_FS_POSIX_ACL=3Dy CONFIG_EXT4_FS_SECURITY=3Dy # CONFIG_EXT4_DEBUG is not set CONFIG_JBD2=3Dm # CONFIG_JBD2_DEBUG is not set Thanks, Qu