https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288127
Bug ID: 288127
Summary: Deadlock in vfs
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 262016
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=262016&action=edit
procstat output
On the fresh (
https://github.com/freebsd/freebsd-src/commit/f6e5bcd4716c2974c7ceb1fbbfc0ef8db8e13d8b
) CURRENT I started getting random processes to hang at random times. When the
process hangs, `top` reports its state as [zfs].
Here is the procstat output for the hanged system state:
https://termbin.com/o8sf (also attached). In that case the hanged processes
were
- yakuake
- nextcloud
- kalendarac
- plasmashell
- pulseaudio
All of these processes are waiting on
mi_switch+0x172 sleepq_switch+0x109 sleeplk+0x110 lockmgr_slock_hard+0x3c3
VOP_LOCK1_APV+0x2a _vn_lock+0x53 vfs_lookup+0x14c namei+0x35d
kern_accessat+0x1c0 amd64_syscall+0x169 fast_syscall_common+0xf8
Interestingly, there is one more process waiting on this lock, but in the
"select" state - xdg-desktop-portal:
mi_switch+0x172 sleepq_switch+0x109 sleeplk+0x110 lockmgr_slock_hard+0x3c3
VOP_LOCK1_APV+0x2a _vn_lock+0x53 vfs_lookup+0x14c namei+0x35d
vn_inotify_add_watch+0x1f5 VOP_INOTIFY_ADD_WATCH_APV+0x2a
kern_inotify_add_watch+0x34a amd64_syscall+0x169 fast_syscall_common+0xf8
This made me think that recent inotify changes might be related to this hang.
After the deadlock resolver kicked in I was able to print the location:
https://github.com/freebsd/freebsd-src/blob/78935fa40eee14aab1c6de676a1017bcabdf5fa1/sys/kern/vfs_subr.c#L3384
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