Re: (r257598) panic: Assertion tmp->tm_pages_used == 0 failed at /usr/src/sys/modules/tmpfs/../../fs/tmpfs/tmpfs_vfsops.c:316

On 2013-11-04 10:27, Konstantin Belousov wrote:
> On Mon, Nov 04, 2013 at 08:35:17AM -0600, Bryan Drewery wrote:
>> 11.0-CURRENT #87 r257598
>> 
>> During a poudriere build.
>> 
>> It creates a tmpfs, builds a port in a jail using that tmpfs and then
>> removes the tmpfs and recreate the tmpfs before building the next 
>> port.
>> 
>> > panic: Assertion tmp->tm_pages_used == 0 failed at /usr/src/sys/modules/tmpfs/../../fs/tmpfs/tmpfs_vfsops.c:316
>> > cpuid = 9
>> > KDB: stack backtrace:
>> > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe1247ee57a0
>> > kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe1247ee5850
>> > vpanic() at vpanic+0x126/frame 0xfffffe1247ee5890
>> > kassert_panic() at kassert_panic+0x136/frame 0xfffffe1247ee5900
>> > tmpfs_unmount() at tmpfs_unmount+0x163/frame 0xfffffe1247ee5930
>> > dounmount() at dounmount+0x41f/frame 0xfffffe1247ee59b0
>> > sys_unmount() at sys_unmount+0x356/frame 0xfffffe1247ee5ae0
>> > amd64_syscall() at amd64_syscall+0x265/frame 0xfffffe1247ee5bf0
>> > Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe1247ee5bf0
>> > --- syscall (22, FreeBSD ELF64, sys_unmount), rip = 0x8008a02fa, rsp = 0x7fffffffd198, rbp = 0x7fffffffd2b0 ---
>> > Uptime: 44m40s
>> 
>> > (kgdb) #0  doadump (textdump=1) at pcpu.h:219
>> > #1  0xffffffff808bcf87 in kern_reboot (howto=260)
>> >     at /usr/src/sys/kern/kern_shutdown.c:447
>> > #2  0xffffffff808bd495 in vpanic (fmt=<value optimized out>,
>> >     ap=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:754
>> > #3  0xffffffff808bd326 in kassert_panic (fmt=<value optimized out>)
>> >     at /usr/src/sys/kern/kern_shutdown.c:642
>> > #4  0xffffffff81e159d3 in tmpfs_unmount (mp=0xfffff810502cd660,
>> >     mntflags=<value optimized out>)
>> >     at /usr/src/sys/modules/tmpfs/../../fs/tmpfs/tmpfs_vfsops.c:316
>> > #5  0xffffffff8095e1af in dounmount (mp=0xfffff810502cd660, flags=134742016,
>> >     td=0xfffff8013d57a490) at /usr/src/sys/kern/vfs_mount.c:1324
>> > #6  0xffffffff8095dd66 in sys_unmount (td=0xfffff8013d57a490,
>> >     uap=0xfffffe1247ee5b80) at /usr/src/sys/kern/vfs_mount.c:1212
>> > #7  0xffffffff80cb7d75 in amd64_syscall (td=0xfffff8013d57a490, traced=0)
>> >     at subr_syscall.c:134
>> > #8  0xffffffff80c9c90b in Xfast_syscall ()
>> >     at /usr/src/sys/amd64/amd64/exception.S:391
>> > #9  0x00000008008a02fa in ?? ()
> 
> Do you have core ?
> I want to see the struct tmpfs_mount content for the tmpfs mount point
> which caused the panic.

Yes.

Hopefully this is what you're asking for:

(kgdb) frame
#4  0xffffffff81e159d3 in tmpfs_unmount (mp=0xfffff810502cd660, 
mntflags=<value optimized out>) at 
/usr/src/sys/modules/tmpfs/../../fs/tmpfs/tmpfs_vfsops.c:316
316             MPASS(tmp->tm_pages_used == 0);

(kgdb) print *mp
$2 = {mnt_mtx = {lock_object = {lo_name = 0xffffffff80f11f09 "struct 
mount mtx", lo_flags = 16973824, lo_data = 0, lo_witness = 
0xfffffe00006d3b00}, mtx_lock = 4}, mnt_gen = 1, mnt_list = {tqe_next = 
0xfffff8116be06660, tqe_prev = 0xfffff81050257688}, mnt_op = 
0xffffffff81e1b940, mnt_vfc = 0xffffffff81e1ba60, mnt_vnodecovered = 
0xfffff8104fb0c3b0,
   mnt_syncer = 0x0, mnt_ref = 1, mnt_nvnodelist = {tqh_first = 0x0, 
tqh_last = 0xfffff810502cd6c0}, mnt_nvnodelistsize = 0, 
mnt_activevnodelist = {tqh_first = 0x0, tqh_last = 0xfffff810502cd6d8}, 
mnt_activevnodelistsize = 0, mnt_writeopcount = 1, mnt_kern_flag = 
16777225, mnt_flag = 4096, mnt_opt = 0xfffff80014424ae0, mnt_optnew = 
0x0, mnt_maxsymlinklen = 0,
   mnt_stat = {f_version = 537068824, f_type = 135, f_flags = 4096, 
f_bsize = 4096, f_iosize = 4096, f_blocks = 17125058, f_bfree = 
17049291, f_bavail = 17049291, f_files = 2147483647, f_ffree = 
2147473906, f_syncwrites = 0, f_asyncwrites = 0, f_syncreads = 0, 
f_asyncreads = 0, f_spare = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, f_namemax = 
255, f_owner = 0, f_fsid = {
       val = {-2029977679, 135}}, f_charspare = '\0' <repeats 79 times>, 
f_fstypename = "tmpfs\000\000\000\000\000\000\000\000\000\000", 
f_mntfromname = "tmpfs", '\0' <repeats 82 times>, f_mntonname = 
"/poudriere/data/build/exp-91amd64-default-xzibition/08/usr/local", '\0' 
<repeats 23 times>}, mnt_cred = 0xfffff8001418e100, mnt_data = 
0xfffff80fedf75700,
   mnt_time = 0, mnt_iosize_max = 65536, mnt_export = 0x0, mnt_label = 
0x0, mnt_hashseed = 4132690418, mnt_lockref = 0, mnt_secondary_writes = 
0, mnt_secondary_accwrites = 0, mnt_susp_owner = 0x0, mnt_gjprovider = 
0x0, mnt_explock = {lock_object = {lo_name = 0xffffffff80f11f1a 
"explock", lo_flags = 108199936, lo_data = 0, lo_witness = 
0xfffffe00006eb280},
     lk_lock = 1, lk_exslpfail = 0, lk_timo = 0, lk_pri = 96}, 
mnt_upper_link = {tqe_next = 0x0, tqe_prev = 0x0}, mnt_uppers = 
{tqh_first = 0x0, tqh_last = 0xfffff810502cd980}}

(kgdb) print *(struct tmpfs_mount *)(mp)->mnt_data
$3 = {tm_pages_max = 18446744073709551615, tm_pages_used = 
18446744073709551615, tm_root = 0xfffff8104ff44828, tm_nodes_max = 
2147483647, tm_ino_unr = 0xfffff8002fd65080, tm_nodes_inuse = 0, 
tm_maxfilesize = 9223372036854775807, tm_nodes_used = {lh_first = 0x0}, 
allnode_lock = {lock_object = {lo_name = 0xffffffff81e1aa47 "tmpfs 
allnode lock",
       lo_flags = 16908288, lo_data = 0, lo_witness = 
0xfffffe00006ecd80}, mtx_lock = 6}, tm_dirent_pool = 0xfffff810500bb000, 
tm_node_pool = 0xfffff81050046000, tm_ronly = 0}

Looks like tm_pages_used is -1.

-- 
Regards,
Bryan Drewery