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Mozilla Thunderbird Subject: Re: Filesystem lockup during backup To: =?UTF-8?Q?Torbj=C3=B6rn_Jansson?= , Qu Wenruo , linux-btrfs@vger.kernel.org References: <4e2d3143-5383-491d-86c2-6b3eb7e21c3e@jansson.tech> <974df153-cbdf-443a-aa3b-0a30c121928d@suse.com> Content-Language: en-US From: Qu Wenruo 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 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2025-10-19 22:42, Qu Wenruo wrote: >> >> >> =E5=9C=A8 2025/10/19 20:43, Torbj=C3=B6rn Jansson =E5=86=99=E9=81=93: >>> Hello. >>> >>> i have a btrfs filesystem on two 18tb disks that i use as backup=20 >>> destination for my proxmox cluster. >>> the filesystem is using btrfs raid1 mirroring and is exported over=20 >>> nfs to the other nodes. >>> >>> because this is used primarily for backups there are periods of heavy= =20 >>> writes (several backups running at the same time) and when this=20 >>> happens it is very likely the filesystem and nfsd locks up completely. >>> this then starts a chain reaction due to the default hard mount=20 >>> blocking processes then eventually ceph also becomes unhappy and then= =20 >>> the vms goes down. >>> >>> below is the hung task output from dmesg on the computer with the disk= s. >>> >>> any idea whats going on and what i can do about it? >>> >>> >>> >>> [1560204.654347] INFO: task nfsd:5136 blocked for more than 122 second= s. >>> [1560204.654351]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Tainted: P=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 O=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 6.14.11-2-pve #1 >> >> v6.14 is EOL, you're completely on the vendor to provide any fix/=20 >> backport. >> >> Recommended to go either LTS kernels or latest upstream one. >> >=20 > ok, not sure i can easily fix that. > i can go back to 6.8 but i think thats not an lts release. > i believe proxmox just released a 6.17 kernel but thats still in the=20 > test repo and if i enable that i might accidentally end up with test=20 > versions of other packages and i dont want that. In that case, I'm afraid you have to ask PVE for support. Neither 6.8 bir 6.14 are supported upstream, thus there must be some PVE= =20 specific backports there. Or you may want to explore how to install upstream kernels on your distro. >=20 >=20 >>> [1560204.654353] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"=20 >>> disables this message. >>> [1560204.654355] task:nfsd=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 state:D stack:0=C2=A0=C2=A0=C2=A0=C2=A0 pid:5136= =20 >>> tgid:5136=C2=A0 ppid:2=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 task_flags:0x2000= 40 flags:0x00004000 >> >> The only message? No more other tasks? >> >=20 > the same (or very similar) message is repeated 10 times, all related to= =20 > nfsd and then it stops with: > "Future hung task reports are suppressed, see sysctl=20 > kernel.hung_task_warnings" >=20 > if you want i can provide all 10 Please provide full dmesg when reporting kernel related bugs. It may seem the same to you, but a lot of time important details are=20 hidden inside the full dmesg. Thanks, Qu >=20 >=20 >>> [1560204.654361] Call Trace: >>> [1560204.654363]=C2=A0 >>> [1560204.654366]=C2=A0 __schedule+0x466/0x1400 >>> [1560204.654376]=C2=A0 schedule+0x29/0x130 >>> [1560204.654381]=C2=A0 io_schedule+0x4c/0x80 >>> [1560204.654387]=C2=A0 folio_wait_bit_common+0x122/0x2e0 >>> [1560204.654393]=C2=A0 ? __pfx_wake_page_function+0x10/0x10 >>> [1560204.654400]=C2=A0 __folio_lock+0x17/0x30 >> >> This hangs at folio locking, which normally means another process has= =20 >> locked the data folio, but no more hanging messages to further debug it= . >> >> Thanks, >> Qu >> >>> [1560204.654404]=C2=A0 extent_write_cache_pages+0x36e/0x7f0 [btrfs] >>> [1560204.654559]=C2=A0 btrfs_writepages+0x75/0x130 [btrfs] >>> [1560204.654703]=C2=A0 do_writepages+0xde/0x280 >>> [1560204.654710]=C2=A0 ? __pfx_ip_finish_output+0x10/0x10 >>> [1560204.654715]=C2=A0 ? wbc_attach_and_unlock_inode+0xd1/0x130 >>> [1560204.654721]=C2=A0 filemap_fdatawrite_wbc+0x58/0x80 >>> [1560204.654726]=C2=A0 ? __ip_queue_xmit+0x19b/0x4e0 >>> [1560204.654731]=C2=A0 __filemap_fdatawrite_range+0x6d/0xa0 >>> [1560204.654744]=C2=A0 filemap_fdatawrite_range+0x13/0x30 >>> [1560204.654748]=C2=A0 btrfs_fdatawrite_range+0x28/0x70 [btrfs] >>> [1560204.654889]=C2=A0 start_ordered_ops.constprop.0+0x4e/0x90 [btrfs] >>> [1560204.655029]=C2=A0 btrfs_sync_file+0xa9/0x610 [btrfs] >>> [1560204.655159]=C2=A0 ? list_lru_del_obj+0xad/0xe0 >>> [1560204.655168]=C2=A0 vfs_fsync_range+0x42/0xa0 >>> [1560204.655174]=C2=A0 nfsd_commit+0x9f/0x180 [nfsd] >>> [1560204.655275]=C2=A0 nfsd4_commit+0x60/0xa0 [nfsd] >>> [1560204.655367]=C2=A0 nfsd4_proc_compound+0x3ad/0x760 [nfsd] >>> [1560204.655427]=C2=A0 nfsd_dispatch+0xce/0x220 [nfsd] >>> [1560204.655486]=C2=A0 svc_process_common+0x464/0x6f0 [sunrpc] >>> [1560204.655553]=C2=A0 ? __pfx_nfsd_dispatch+0x10/0x10 [nfsd] >>> [1560204.655611]=C2=A0 svc_process+0x136/0x1f0 [sunrpc] >>> [1560204.655675]=C2=A0 svc_recv+0x7bb/0x9a0 [sunrpc] >>> [1560204.655741]=C2=A0 ? __pfx_nfsd+0x10/0x10 [nfsd] >>> [1560204.655798]=C2=A0 nfsd+0x90/0xf0 [nfsd] >>> [1560204.655852]=C2=A0 kthread+0xf9/0x230 >>> [1560204.655855]=C2=A0 ? __pfx_kthread+0x10/0x10 >>> [1560204.655858]=C2=A0 ret_from_fork+0x44/0x70 >>> [1560204.655862]=C2=A0 ? __pfx_kthread+0x10/0x10 >>> [1560204.655864]=C2=A0 ret_from_fork_asm+0x1a/0x30 >>> [1560204.655871]=C2=A0 >>> >=20 >=20 >=20