[Bug 246886] [sendfile] Nginx + NFS or FUSE causes VM stall

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246886

Marcin Gryszkalis <mg at fork.pl> changed:

           What    |Removed                     |Added
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                 CC|                            |mg at fork.pl

--- Comment #64 from Marcin Gryszkalis <mg at fork.pl> ---
I have same problem on 12.2-RELEASE-p4 with nginx + NFS, happens once a month
on production, after lastest hang (today) I turned sendfile off.

 1025 18521 18512  0   20  0   31724   18592 grbmaw   D     -      0:11.40
nginx: worker process (nginx)

mi_switch+0xd4 
sleepq_wait+0x2c 
_sleep+0x253 
vm_page_busy_sleep+0xaf 
vm_page_grab_pages+0x3f2 
allocbuf+0x371 
getblkx+0x5be 
breadn_flags+0x3d 
vfs_bio_getpages+0x33f 
ncl_getpages+0x2ac 
VOP_GETPAGES_APV+0x7b 
vop_stdgetpages_async+0x49 
VOP_GETPAGES_ASYNC_APV+0x7b 
vnode_pager_getpages_async+0x7d 
vn_sendfile+0xdf2 
sys_sendfile+0xfb 
amd64_syscall+0x387 
fast_syscall_common+0xf8

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