Hi all,
for months now I've been having a reproducible hang under load
(make -j4 buildworld on a uniprocessor with plenty of RAM). I transcribed
some info which might be useful to debug it; it seems to me this is a
deadlock (am I right?). I'll leave the laptop in ddb so I can provide
more info.
This is last week current; I had seen a few commits I thought might fix
this but no.
db> show locked
Locked vnodes
0xc202ca68: tag ufs, type VDIR, usecont 1, writecount 0, refcount 2, flags
(VV_OBJBUF), lock type ufs: EXCL (count 1) by pid 53304
ino 31744, on dev ad2s2f (4, 16)
0xc27e04a0: tag ufs, type VREG, usecount 18, writecount 0, refcount 1, flags
(VV_TEXT|VV_OBJBUF), lock type ufs: EXCL (count 1) by pid 53301 with 3 pending
ino 87582, on dev ad2s2f (4, 16)
0xc2c13940: tag ufs, type VREG, usecount 18, writecount 0, refcount 1, flags
(VV_TEXT|VV_OBJBUF), lock type ufs: EXCL (count 1) by pid 53302 with 3 pending
ino 33113, on dev ad2s2f (4, 16)
db> trace 53301
mi_switch(c303f340,44,0,0,0) at mi_switch+0x15e
msleep(c0d260b4,c03aece8,44,c0349f69,0) at msleep+0x4e1
acquire(c0d260b4,1000000,600,c0d26078,d035) at acquire+0xa7
lockmgr(...) at lockmgt+0x3c8
_vm_map_lock(...) at _vm_map_lock+0x32
kmem_free_wakeup(...) at kmem_free_wakeup+0x2a
execve
syscall
Xint080_syscall
--- syscall(0, FreeBSD ELF32, nosys), eip = 0x80480c0, esp = 0xbfbff8dc, ebp = 0
db> trace 53302
mi_switch(c1f77a90,44,0,0,0) at mi_switch+0x15e
msleep(c0d260b4,c03aece8,44,c0349f69,0) at msleep+0x4e1
acquire(c0d260b4,1000000,600,c0d26078,d035) at acquire+0xa7
lockmgr(...) at lockmgt+0x3c8
_vm_map_lock(...) at _vm_map_lock+0x32
kmem_free_wakeup(...) at kmem_free_wakeup+0x2a
execve
syscall
Xint080_syscall
--- syscall(0, FreeBSD ELF32, nosys), eip = 0x80480c0, esp = 0xbfbff8dc, ebp = 0
db> trace 53304
mi_switch(c22aa8f0,50,0,1000,0) at mi_switch+0x15e
msleep(c2c13a04,c03af920,50,c0348e2f,0) at msleep+0x4e1
acquire(c2c13a04,1000040,600,c201b6f0,d035) at acquire+0xa7
lockmgr(...) at lockmgt+0x3c8
vop_stdlock(...) at vop_stdlock+0x2c
ufs_vnoperate(...) at ufs_vnoperate+0x18
vn_lock(...) at vn_lock+0x11e
vget(...) at vget+0x100
vfs_cache_lookup(...) at vfs_cache_lookup+0x1ed
ufs_vnoperate(...) at ufs_vnoperate+0x18
lookup(...) at lookup+0x302
namei(...) at namei+0x20b
execve
syscall
Xint080_syscall
--- syscall(0, FreeBSD ELF32, nosys), eip = 0x80480c0, esp = 0xbfbff8dc, ebp = 0
Bye,
Andrea
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