Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
thr 3870x00007f66d7b0cd7f in __GI___poll (fds=fds@entry=0x7ffea9405018, nfds=nfds@entry=1, timeout=timeout@entry=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
29      ../sysdeps/unix/sysv/linux/poll.c: No such file or directory.
(gdb) thr 387
[Switching to thread 387 (Thread 0x7f669793d640 (LWP 353958))]
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x7f669793a7d8) at ./nptl/futex-internal.c:57
57      ./nptl/futex-internal.c: No such file or directory.
(gdb) fr 9
#9  0x00007f66d773f7ac in fellow_busy_seg_memalloc (membuddy=<optimized out>, fcs=fcs@entry=0x7f66bc8c4180) at fellow_cache.c:3338
3338            fcs->alloc = buddy_alloc1_ptr_extent_wait(membuddy, FEP_SPC,
(gdb) p *fcs
$1 = {magic = 25208, state = FCS_USABLE, fcs_onlru = 0, fco_infdb = 0, refcnt = 0, lru_list = {vtqe_next = 0x0, vtqe_prev = 0x0}, fco = 0x7f66bc8c4000, disk_seg = 0x7f66bca463f0, alloc = {ptr = 0x0, size = 0}, len = 0}
(gdb) p *fds
$2 = {magic = 63805, _reserved = 0 '\000', fht = 3 '\003', segnum = 1, seg = {off = 3935305728, size = 741376}, fh = {{sha256 = '\000' <repeats 31 times>, xxh32 = 0, xxh64 = 0, xxh128 = '\000' <repeats 15 times>}}}
(gdb) 

VARNISH_STORAGE="\
memory=buddy,100M \
-s file=fellow,/var/lib/varnish/varnish_storage.bin,1G,100M,8k \
-s file2=fellow,/var/lib/varnish/varnish_storage2.bin,1G,100M=file,8k \
-s file2_img=fellow,/var/lib/varnish/varnish_storage2-img.bin,15G,100M=file,16k \
-s file2_img_thumb=fellow,/var/lib/varnish/varnish_storage2-img-thumb.bin,15G,100M=file,16k \
"