https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293198
Bug ID: 293198
Summary: zfs deadlock while copying many files,
vfs_deleteextattr_dir-related?
Product: Base System
Version: 15.0-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 268084
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=268084&action=edit
Output from procstat -kk -a
While copying many zfs (30000) filesystems (using a loop of zfs create ; tar
cpf - | (cd xxx ; tar xpf -) the bsdtar writing the files (and eventually the
whole system) deadlocks at after some 479 filesystems have been copied:
# fgrep bsdtar /tmp/procstat-kka-2.out
48759 103729 bsdtar - mi_switch+0xbc
sleepq_catch_signals+0x27d sleepq_wait_sig+0x9 _sleep+0x197
uipc_sosend_stream_or_seqpacket+0x475 sousrsend+0x5f dofilewrite+0x81
sys_write+0x127 amd64_syscall+0x126 fast_syscall_common+0xf8
48760 105220 bsdtar - mi_switch+0xbc
_sleep+0x19e rms_rlock_fallback+0x90 zfs_lookup+0x74 zfs_deleteextattr_dir+0x38
zfs_setextattr+0x7dc VOP_SETEXTATTR_APV+0x24 extattr_set_vp+0x11d
kern_extattr_set_path+0x14e sys_extattr_set_link+0x6b amd64_syscall+0x126
fast_syscall_common+0xf8
My reading of the deadlock is that it is related to some extattrs.
ps auxww|grep bsdtar indicates that it was copying some stuff in a Documents/My
Videos directory that looks like this in the source:
# ls -laR My\ Videos
total 28
drwxr-xr-x 2 agnra495 student-liu.se 3 Apr 9 2025 $RECYCLE.BIN
drwxr-xr-x 3 agnra495 student-liu.se 4 Apr 15 2025 .
drwxr-xr-x 6 agnra495 student-liu.se 7 Apr 15 2025 ..
-rw-r--r-- 1 agnra495 student-liu.se 504 Apr 15 2025 desktop.ini
My Videos/$RECYCLE.BIN:
total 11
drwxr-xr-x 2 agnra495 student-liu.se 3 Apr 9 2025 .
drwxr-xr-x 3 agnra495 student-liu.se 4 Apr 15 2025 ..
-rw-r--r-- 1 agnra495 student-liu.se 129 Apr 9 2025 desktop.ini
There are some extattrs set on the files but nothing strange:
# find . -print | xargs lsextattr user
. DOSATTRIB
./desktop.ini DOSATTRIB
./$RECYCLE.BIN DOSATTRIB
./$RECYCLE.BIN/desktop.ini DOSATTRIB
# find . -print | xargs lsextattr system
.
./desktop.ini
./$RECYCLE.BIN
./$RECYCLE.BIN/desktop.ini
Attaching the full "procstat -kk -a" output.
The copying is being done inside a Zpool.
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