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Fri, 08 Aug 2025 10:50:59 +0200 Message-ID: <4ef2476f-50c3-424d-927d-100e305e1f8e@gmx.com> Date: Fri, 8 Aug 2025 18:20:56 +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 Subject: Re: Ext4 iomap warning during btrfs/136 (yes, it's from btrfs test cases) From: Qu Wenruo To: linux-ext4 , linux-btrfs , "linux-fsdevel@vger.kernel.org" References: <9b650a52-9672-4604-a765-bb6be55d1e4a@gmx.com> Content-Language: en-US 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/ In-Reply-To: <9b650a52-9672-4604-a765-bb6be55d1e4a@gmx.com> Content-Type: text/plain; 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The following reproducer is much smaller, and of course, btrfs is not=20 involved: =2D-- #!/bin/bash dev=3D"/dev/test/scratch1" mnt=3D"/mnt/btrfs/" fsstress=3D"/home/adam/xfstests-dev/ltp/fsstress" mkfs.ext3 -F -b 16k $dev mount $dev $mnt $fsstress -w -n 128 -d $mnt umount $dev =2D-- And ext4 is fine, so it's ext3 mode causing the problem. Furthermore, after the kernel wanring, the fsstress will never finish,=20 and no blocked process either. Thanks, Qu >=20 > 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. >=20 > The hang happens at the ext3 populating part, with the following kernel= =20 > warning: >=20 > [=C2=A0 989.664270] run fstests btrfs/136 at 2025-08-08 16:57:37 > [=C2=A0 990.551395] EXT4-fs (dm-3): mounting ext3 file system using the = ext4=20 > subsystem > [=C2=A0 990.554980] EXT4-fs (dm-3): mounted filesystem d90f4325-=20 > e6a6-4787-9da8-150ece277a94 r/w with ordered data mode. Quota mode: none= . > [=C2=A0 990.581540] ------------[ cut here ]------------ > [=C2=A0 990.581551] WARNING: CPU: 3 PID: 434101 at fs/iomap/iter.c:34=20 > iomap_iter_done+0x148/0x190 > [=C2=A0 990.583497] Modules linked in: dm_flakey nls_ascii nls_cp437 vfa= t 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 > [=C2=A0 990.587247] CPU: 3 UID: 0 PID: 434101 Comm: fsstress Not tainted= =20 > 6.16.0-rc7-custom+ #128 PREEMPT(voluntary) > [=C2=A0 990.588525] Hardware name: QEMU KVM Virtual Machine, BIOS unknow= n=20 > 2/2/2022 > [=C2=A0 990.589414] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSB= S=20 > BTYPE=3D--) > [=C2=A0 990.590314] pc : iomap_iter_done+0x148/0x190 > [=C2=A0 990.590874] lr : iomap_iter+0x174/0x230 > [=C2=A0 990.591370] sp : ffff8000880af740 > [=C2=A0 990.591800] x29: ffff8000880af740 x28: ffff0000db8e6840 x27:=20 > 0000000000000000 > [=C2=A0 990.592716] x26: 0000000000000000 x25: ffff8000880af830 x24:=20 > 0000004000000000 > [=C2=A0 990.593631] x23: 0000000000000002 x22: 000001bfdbfa8000 x21:=20 > ffffa6a41c002e48 > [=C2=A0 990.594549] x20: 0000000000000001 x19: ffff8000880af808 x18:=20 > 0000000000000000 > [=C2=A0 990.595464] x17: 0000000000000000 x16: ffffa6a495ee6cd0 x15:=20 > 0000000000000000 > [=C2=A0 990.596379] x14: 00000000000003d4 x13: 00000000fa83b2da x12:=20 > 0000b236fc95f18c > [=C2=A0 990.597295] x11: ffffa6a4978b9c08 x10: 0000000000001da0 x9 :=20 > ffffa6a41c1a2a44 > [=C2=A0 990.598210] x8 : ffff8000880af5c8 x7 : 0000000001000000 x6 :=20 > 0000000000000000 > [=C2=A0 990.599125] x5 : 0000000000000004 x4 : 000001bfdbfa8000 x3 :=20 > 0000000000000000 > [=C2=A0 990.600040] x2 : 0000000000000000 x1 : 0000004004030000 x0 :=20 > 0000000000000000 > [=C2=A0 990.600955] Call trace: > [=C2=A0 990.601273]=C2=A0 iomap_iter_done+0x148/0x190 (P) > [=C2=A0 990.601829]=C2=A0 iomap_iter+0x174/0x230 > [=C2=A0 990.602280]=C2=A0 iomap_fiemap+0x154/0x1d8 > [=C2=A0 990.602751]=C2=A0 ext4_fiemap+0x110/0x140 [ext4] > [=C2=A0 990.603350]=C2=A0 do_vfs_ioctl+0x4b8/0xbc0 > [=C2=A0 990.603831]=C2=A0 __arm64_sys_ioctl+0x8c/0x120 > [=C2=A0 990.604346]=C2=A0 invoke_syscall+0x6c/0x100 > [=C2=A0 990.604836]=C2=A0 el0_svc_common.constprop.0+0x48/0xf0 > [=C2=A0 990.605444]=C2=A0 do_el0_svc+0x24/0x38 > [=C2=A0 990.605875]=C2=A0 el0_svc+0x38/0x120 > [=C2=A0 990.606283]=C2=A0 el0t_64_sync_handler+0x10c/0x138 > [=C2=A0 990.606846]=C2=A0 el0t_64_sync+0x198/0x1a0 > [=C2=A0 990.607319] ---[ end trace 0000000000000000 ]--- > [=C2=A0 990.608042] ------------[ cut here ]------------ > [=C2=A0 990.608047] WARNING: CPU: 3 PID: 434101 at fs/iomap/iter.c:35=20 > iomap_iter_done+0x164/0x190 > [=C2=A0 990.610842] Modules linked in: dm_flakey nls_ascii nls_cp437 vfa= t 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 > [=C2=A0 990.619189] CPU: 3 UID: 0 PID: 434101 Comm: fsstress Tainted: G= =20 > =C2=A0W=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 6.1= 6.0-rc7-custom+ #128 PREEMPT(voluntary) > [=C2=A0 990.620876] Tainted: [W]=3DWARN > [=C2=A0 990.621458] Hardware name: QEMU KVM Virtual Machine, BIOS unknow= n=20 > 2/2/2022 > [=C2=A0 990.622507] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSB= S=20 > BTYPE=3D--) > [=C2=A0 990.623911] pc : iomap_iter_done+0x164/0x190 > [=C2=A0 990.624936] lr : iomap_iter+0x174/0x230 > [=C2=A0 990.626747] sp : ffff8000880af740 > [=C2=A0 990.627404] x29: ffff8000880af740 x28: ffff0000db8e6840 x27:=20 > 0000000000000000 > [=C2=A0 990.628947] x26: 0000000000000000 x25: ffff8000880af830 x24:=20 > 0000004000000000 > [=C2=A0 990.631024] x23: 0000000000000002 x22: 000001bfdbfa8000 x21:=20 > ffffa6a41c002e48 > [=C2=A0 990.632278] x20: 0000000000000001 x19: ffff8000880af808 x18:=20 > 0000000000000000 > [=C2=A0 990.634189] x17: 0000000000000000 x16: ffffa6a495ee6cd0 x15:=20 > 0000000000000000 > [=C2=A0 990.635608] x14: 00000000000003d4 x13: 00000000fa83b2da x12:=20 > 0000b236fc95f18c > [=C2=A0 990.637854] x11: ffffa6a4978b9c08 x10: 0000000000001da0 x9 :=20 > ffffa6a41c1a2a44 > [=C2=A0 990.639181] x8 : ffff8000880af5c8 x7 : 0000000001000000 x6 :=20 > 0000000000000000 > [=C2=A0 990.642370] x5 : 0000000000000004 x4 : 000001bfdbfa8000 x3 :=20 > 0000000000000000 > [=C2=A0 990.644505] x2 : 0000004004030000 x1 : 0000004004030000 x0 :=20 > 0000004004030000 > [=C2=A0 990.645493] Call trace: > [=C2=A0 990.645841]=C2=A0 iomap_iter_done+0x164/0x190 (P) > [=C2=A0 990.646377]=C2=A0 iomap_iter+0x174/0x230 > [=C2=A0 990.647550]=C2=A0 iomap_fiemap+0x154/0x1d8 > [=C2=A0 990.648052]=C2=A0 ext4_fiemap+0x110/0x140 [ext4] > [=C2=A0 990.649061]=C2=A0 do_vfs_ioctl+0x4b8/0xbc0 > [=C2=A0 990.649704]=C2=A0 __arm64_sys_ioctl+0x8c/0x120 > [=C2=A0 990.652141]=C2=A0 invoke_syscall+0x6c/0x100 > [=C2=A0 990.653001]=C2=A0 el0_svc_common.constprop.0+0x48/0xf0 > [=C2=A0 990.653909]=C2=A0 do_el0_svc+0x24/0x38 > [=C2=A0 990.654332]=C2=A0 el0_svc+0x38/0x120 > [=C2=A0 990.654736]=C2=A0 el0t_64_sync_handler+0x10c/0x138 > [=C2=A0 990.655295]=C2=A0 el0t_64_sync+0x198/0x1a0 > [=C2=A0 990.655761] ---[ end trace 0000000000000000 ]--- >=20 > 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? >=20 > The involved ext4 kernel configs are the following: >=20 > # 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 >=20 > Thanks, > Qu >=20