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List:       linux-btrfs
Subject:    Re: Btrfs volume seems to hang with any kernel newer than 4.20
From:       Nikolay Borisov <nborisov () suse ! com>
Date:       2019-09-30 6:03:18
Message-ID: b1c52ee1-aca9-651c-6337-b4fd2517f8d4 () suse ! com
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On 30.09.19 г. 1:11 ч., Andrew Nelson wrote:
> This is on a Fedora 30 system. I have tested with both 5.1 and 5.2
> with the same result. Kernels 4.20 and older have worked fine. Not
> sure where to start debugging the issue. Here is an example stack of
> Vim hanging when trying to do a write to the filesystem.
> 
> [<0>] pagecache_get_page+0x196/0x370
> [<0>] io_ctl_prepare_pages+0x4b/0x140 [btrfs]
> [<0>] __load_free_space_cache+0x1e1/0x600 [btrfs]
> [<0>] load_free_space_cache+0xc1/0x170 [btrfs]
> [<0>] cache_block_group+0x1b4/0x3d0 [btrfs]
> [<0>] find_free_extent+0x901/0xff0 [btrfs]
> [<0>] btrfs_reserve_extent+0xea/0x190 [btrfs]
> [<0>] __btrfs_prealloc_file_range+0x11d/0x490 [btrfs]
> [<0>] cache_save_setup+0x229/0x3d0 [btrfs]
> [<0>] btrfs_start_dirty_block_groups+0x1e2/0x4d0 [btrfs]
> [<0>] btrfs_commit_transaction+0xba/0x9a0 [btrfs]
> [<0>] btrfs_sync_file+0x32b/0x420 [btrfs]
> [<0>] do_fsync+0x38/0x70
> [<0>] __x64_sys_fsync+0x10/0x20
> [<0>] do_syscall_64+0x5f/0x1a0
> [<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> 

When the hang occurs issue :

"echo w > /proc/sysrq-trigger" then get the output of this command from
dmesg and post it to the mailing list.
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