[issue1726] tmpfs "malloc limit exceeded" panic

["Edward O'Callaghan \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

Edward O'Callaghan <eocallaghan@auroraux.org> added the comment:

I was able to reproduce with a hammer equivalent with the below test case from
vsrinivas.

(kgdb) bt
#0  _get_mycpu (di=0xc06d4ca0) at ./machine/thread.h:83
#1  md_dumpsys (di=0xc06d4ca0)
    at /usr/src/sys/platform/pc32/i386/dump_machdep.c:263
#2  0xc0304d15 in dumpsys () at /usr/src/sys/kern/kern_shutdown.c:880
#3  0xc03052d5 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:387
#4  0xc030559e in panic (fmt=0xc05bb41b "%s: malloc limit exceeded")
    at /usr/src/sys/kern/kern_shutdown.c:786
#5  0xc03032bb in kmalloc (size=25, type=0xc1d8f590, flags=258)
    at /usr/src/sys/kern/kern_slaballoc.c:503
#6  0xc04aa5a3 in hammer_alloc_mem_record (ip=0xcb803d50, data_len=25)
    at /usr/src/sys/vfs/hammer/hammer_object.c:280
#7  0xc04aa91f in hammer_ip_add_directory (trans=0xce350ad4, 
    dip=0xcb803d50, name=0xd3cdb1d0 "000452457", bytes=9, ip=0xce31df50)
    at /usr/src/sys/vfs/hammer/hammer_object.c:666
#8  0xc04bbf8a in hammer_vop_nlink (ap=0xce350b2c)
    at /usr/src/sys/vfs/hammer/hammer_vnops.c:1388
#9  0xc036cc1f in vop_nlink_ap (ap=0xce350b2c)
    at /usr/src/sys/kern/vfs_vopops.c:1978
#10 0xc03717ca in null_nlink (ap=0xce350b2c)
    at /usr/src/sys/vfs/nullfs/null_vnops.c:164
#11 0xc036d465 in vop_nlink (ops=0xcdbbe030, nch=0xce350c48, 
    dvp=0xce0913e8, vp=0xce2f04e8, cred=0xcdef1738)
    at /usr/src/sys/kern/vfs_vopops.c:1397
---Type <return> to continue, or q <return> to quit--- 
---Type <return> to continue, or q <return> to quit---#12 0xc0365496 in
kern_link (nd=0xce350c80, linknd=0xce350c48)
    at /usr/src/sys/kern/vfs_syscalls.c:2320
#13 0xc036ad49 in sys_link (uap=0xce350cf0)
    at /usr/src/sys/kern/vfs_syscalls.c:2345
#14 0xc055f6b3 in syscall2 (frame=0xce350d40)
    at /usr/src/sys/platform/pc32/i386/trap.c:1310
#15 0xc0547fb6 in Xint0x80_syscall ()
    at /usr/src/sys/platform/pc32/i386/exception.s:876
#16 0x0000001f in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(kgdb) 

Cheers,
Edward.

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DragonFly issue tracker <bugs@lists.dragonflybsd.org>
<http://bugs.dragonflybsd.org/issue1726>
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