DragonFlyBSD

Hello,
the client machine writes (not very fast, like 150Kb/s) data to the DragonFlyBSD NFS server with hammer2 partition.
The server dies periodically (3-4 days). These crashes do not depend on the time of continuous work (I tried to reboot several times a day), but rather just a coincidence of some circumstances.
I am using the master branch, radeon graphics driver with hardware acceleration is disabled. Crashes occur both when idle at night and when working during the day.

Here are the last three files, they refer to different commits on the master, of course, but the error is the same.

I have all the vmcore.? and kern.? files and I can put them wherever you specify.

======== kgdb -n 6 =========
Loaded symbols for /boot/kernel/radeonkmsfw_BONAIRE_vce.ko
get_mycpu () at ./machine/thread.h:69
69 __asm ("movq %%gs:globaldata,%0" : "=r" (gd) : "m"(_mycpu__dummy));
(kgdb) bt
#0 _get_mycpu () at ./machine/thread.h:69
#1 panic (
fmt=fmt@entry=0xffffffff80c25920 "assertion \"%s\" failed in %s at %s:%u")
at /usr/src/sys/kern/kern_shutdown.c:868
#2 0xffffffff8066cf23 in _mtx_unlock (mtx=mtx@entry=0xfffff8039daaa040)
at /usr/src/sys/kern/kern_mutex.c:725
#3 0xffffffff809464b0 in mtx_unlock (mtx=0xfffff8039daaa040)
at /usr/src/sys/sys/mutex2.h:358
#4 mtx_lock_temp_release (mtx=0xfffff8039daaa040)
at /usr/src/sys/sys/mutex2.h:491
#5 hammer2_inode_lock_temp_release (ip=0xfffff8039daa9fc0)
at /usr/src/sys/vfs/hammer2/hammer2_inode.c:496
#6 hammer2_igetv (ip=ip@entry=0xfffff8039daa9fc0,
errorp=errorp@entry=0xfffff8038047926c)
at /usr/src/sys/vfs/hammer2/hammer2_inode.c:685
#7 0xffffffff8094fc24 in hammer2_vfs_vget (mp=<optimized out>,
dvp=dvp@entry=0x0, ino=<optimized out>, ino@entry=14263250,
vpp=vpp@entry=0xfffff80380479388)
at /usr/src/sys/vfs/hammer2/hammer2_vfsops.c:1911
#8 0xffffffff80950596 in hammer2_vfs_fhtovp (mp=<optimized out>,
rootvp=<optimized out>, fhp=<optimized out>, vpp=0xfffff80380479388)
at /usr/src/sys/vfs/hammer2/hammer2_vfsops.c:2871
#9 0xffffffff807fc64f in nfsrv_fhtovp (fhp=fhp@entry=0xfffff803804793c8,
lockflag=lockflag@entry=1, mpp=mpp@entry=0xfffff80380479390,
vpp=vpp@entry=0xfffff80380479388, cred=cred@entry=0xfffff8039b2614e0,
slp=slp@entry=0xfffff8038057f240, nam=0xfffff80157724070,
rdonlyp=0xfffff80380479384, kerbflag=0, pubflag=1)
at /usr/src/sys/vfs/nfs/nfs_subs.c:1247
#10 0xffffffff807ef326 in nfsrv_write (nfsd=0xfffff8039b261420,
slp=0xfffff8038057f240, td=<optimized out>, mrq=0xfffff80380479708)
at /usr/src/sys/vfs/nfs/nfs_serv.c:1089
#11 0xffffffff807fe23f in nfssvc_nfsd (td=<optimized out>,
argp=<optimized out>, nsd=<optimized out>)
at /usr/src/sys/vfs/nfs/nfs_syscalls.c:678
#12 sys_nfssvc (sysmsg=<optimized out>, uap=<optimized out>)
at /usr/src/sys/vfs/nfs/nfs_syscalls.c:300
#13 0xffffffff80bc347e in syscall2 (frame=0xfffff803804799f8)
at /usr/src/sys/platform/pc64/x86_64/trap.c:1284
#14 0xffffffff80b8664d in Xfast_syscall ()
at /usr/src/sys/platform/pc64/x86_64/exception.S:448
#15 0x000000000000002b in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(kgdb) ====================

======== kgdb -n 4 =========
Loaded symbols for /boot/kernel/radeonkmsfw_BONAIRE_vce.ko
get_mycpu () at ./machine/thread.h:69
69 __asm ("movq %%gs:globaldata,%0" : "=r" (gd) : "m"(_mycpu__dummy));
(kgdb)
(kgdb) bt
#0 _get_mycpu () at ./machine/thread.h:69
#1 panic (
fmt=fmt@entry=0xffffffff80c5ec30 "assertion \"%s\" failed in %s at %s:%u")
at /usr/src/sys/kern/kern_shutdown.c:868
#2 0xffffffff8066b973 in _mtx_unlock (mtx=mtx@entry=0xfffff8031a395a40)
at /usr/src/sys/kern/kern_mutex.c:725
#3 0xffffffff809447c0 in mtx_unlock (mtx=0xfffff8031a395a40)
at /usr/src/sys/sys/mutex2.h:358
#4 mtx_lock_temp_release (mtx=0xfffff8031a395a40)
at /usr/src/sys/sys/mutex2.h:491
#5 hammer2_inode_lock_temp_release (ip=0xfffff8031a3959c0)
at /usr/src/sys/vfs/hammer2/hammer2_inode.c:496
#6 hammer2_igetv (ip=ip@entry=0xfffff8031a3959c0,
errorp=errorp@entry=0xfffff8031312e22c)
at /usr/src/sys/vfs/hammer2/hammer2_inode.c:685
#7 0xffffffff8094de84 in hammer2_vfs_vget (mp=<optimized out>,
dvp=dvp@entry=0x0, ino=<optimized out>, ino@entry=14263012,
vpp=vpp@entry=0xfffff8031312e348)
at /usr/src/sys/vfs/hammer2/hammer2_vfsops.c:1922
#8 0xffffffff8094e7c6 in hammer2_vfs_fhtovp (mp=<optimized out>,
rootvp=<optimized out>, fhp=<optimized out>, vpp=0xfffff8031312e348)
at /usr/src/sys/vfs/hammer2/hammer2_vfsops.c:2895
#9 0xffffffff807fa90f in nfsrv_fhtovp (fhp=fhp@entry=0xfffff8031312e388,
lockflag=lockflag@entry=1, mpp=mpp@entry=0xfffff8031312e350,
vpp=vpp@entry=0xfffff8031312e348, cred=cred@entry=0xfffff80325a10660,
slp=slp@entry=0xfffff8031316fac0, nam=0xfffff800e80a4130,
rdonlyp=0xfffff8031312e344, kerbflag=0, pubflag=1)
at /usr/src/sys/vfs/nfs/nfs_subs.c:1232
#10 0xffffffff807ed7d6 in nfsrv_write (nfsd=0xfffff80325a105a0,
slp=0xfffff8031316fac0, td=<optimized out>, mrq=0xfffff8031312e6c8)
at /usr/src/sys/vfs/nfs/nfs_serv.c:1089
#11 0xffffffff807fc51f in nfssvc_nfsd (td=<optimized out>,
argp=<optimized out>, nsd=<optimized out>)
at /usr/src/sys/vfs/nfs/nfs_syscalls.c:678
#12 sys_nfssvc (uap=<optimized out>) at /usr/src/sys/vfs/nfs/nfs_syscalls.c:300
#13 0xffffffff80babbeb in syscall2 (frame=0xfffff8031312e9f8)
at /usr/src/sys/platform/pc64/x86_64/trap.c:1319
#14 0xffffffff80b85d5d in Xfast_syscall ()
at /usr/src/sys/platform/pc64/x86_64/exception.S:450
#15 0x000000000000002b in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(kgdb) =============================