lots of malloc(M_WAITOK)'s in interrupt context from camisr

AFter unbreaking the check for interrupt context in malloc():

%%%
Index: /sysc/kern/kern_malloc.c
===================================================================
RCS file: /home/ncvs/src/sys/kern/kern_malloc.c,v
retrieving revision 1.121
diff -u -2 -r1.121 kern_malloc.c
--- /sysc/kern/kern_malloc.c	26 Mar 2003 20:44:29 -0000	1.121
+++ /sysc/kern/kern_malloc.c	25 Apr 2003 15:26:51 -0000
_at__at_ -217,6 +217,11 _at__at_
 #endif
 	if (flags & M_WAITOK)
-		KASSERT(curthread->td_intr_nesting_level == 0,
-		   ("malloc(M_WAITOK) in interrupt context"));
+		KASSERT(curthread->td_ithd == NULL &&
+		    curthread->td_intr_nesting_level == 0,
+			("malloc(M_WAITOK) in interrupt context"));
+	if (flags & M_WAITOK)
+		if (curthread->td_ithd != NULL ||
+		    curthread->td_intr_nesting_level != 0)
+			Debugger("malloc(M_WAITOK) in interrupt context");
 	if (size <= KMEM_ZMAX) {
 		if (size & KMEM_ZMASK)
%%%

I get lots of "malloc(M_WAITOK) in interrupt context"'s reported for camisr
(from the non-KASSERT code in the above since the KASSERT would just panic
once):

%%%
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(d0,c0340080,502,6800,40) at malloc+0x3c
allocdev(c03414e0,c2192820,c0332f80,df16dca8,c01b4bc0) at allocdev+0x4d
makedev(68,0,c2192820,0,c6140400) at makedev+0x65
make_dev(c0332f80,0,0,5,180) at make_dev+0x110
xpt_periph_init(c6140400,c6346800,c6344800,df16dd00,c0131139) at xpt_periph_init+0x1d
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(2c,c0343f60,102,1,c61152c0) at malloc+0x3c
sysctl_add_oid(c61152c0,c035d2a8,ffffffff,df16d73c,80000001) at sysctl_add_oid+0x7c
cdregister(c6343800,df16d8d8,3,1,0) at cdregister+0x1a7
cam_periph_alloc(c0132e50,c0132a88,c0132b20,c0133bd0,c032829a,0,c60e10c0,c0132d30,80,df16d8d8) at cam_periph_alloc+0x1ef
cdasync(0,80,df16db38,df16d8d8,df16d8d8) at cdasync+0x6f
xptsetasyncfunc(c6344800,c60e16f0,df16db80,c012d7f6,c6344800) at xptsetasyncfunc+0x64
xptdefdevicefunc(c6344800,df16dbfc,c6341380,df16dbfc,c012d91c) at xptdefdevicefunc+0x15
xptdevicetraverse(c6341300,0,c012d944,df16dbfc,df16dbb4) at xptdevicetraverse+0x2a
xptdeftargetfunc(c6341300,df16dbfc,c6341240,df16dbfc,c012d8f4) at xptdeftargetfunc+0x26
xpttargettraverse(c6341400,0,c012d91c,df16dbfc,df16dbe8) at xpttargettraverse+0x2b
xptdefbusfunc(c6341400,df16dbfc) at xptdefbusfunc+0x26
xptbustraverse(0,c012d8f4,df16dbfc,2,c012d9d8) at xptbustraverse+0x2b
xpt_for_all_devices(c012d9d8,c60e16f0) at xpt_for_all_devices+0x29
xpt_action(df16dc54,df16dc54,c60e1680,5,c60e1680) at xpt_action+0x667
cdinit(c6140400,c6346800,c6344800,df16dd00,c0131139) at cdinit+0x52
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(2,c0343f60,2,df16d73c,2c) at malloc+0x3c
sysctl_add_oid(c61152c0,c035d2a8,ffffffff,df16d73c,80000001) at sysctl_add_oid+0xaf
cdregister(c6343800,df16d8d8,3,1,0) at cdregister+0x1a7
cam_periph_alloc(c0132e50,c0132a88,c0132b20,c0133bd0,c032829a,0,c60e10c0,c0132d30,80,df16d8d8) at cam_periph_alloc+0x1ef
cdasync(0,80,df16db38,df16d8d8,df16d8d8) at cdasync+0x6f
xptsetasyncfunc(c6344800,c60e16f0,df16db80,c012d7f6,c6344800) at xptsetasyncfunc+0x64
xptdefdevicefunc(c6344800,df16dbfc,c6341380,df16dbfc,c012d91c) at xptdefdevicefunc+0x15
xptdevicetraverse(c6341300,0,c012d944,df16dbfc,df16dbb4) at xptdevicetraverse+0x2a
xptdeftargetfunc(c6341300,df16dbfc,c6341240,df16dbfc,c012d8f4) at xptdeftargetfunc+0x26
xpttargettraverse(c6341400,0,c012d91c,df16dbfc,df16dbe8) at xpttargettraverse+0x2b
xptdefbusfunc(c6341400,df16dbfc) at xptdefbusfunc+0x26
xptbustraverse(0,c012d8f4,df16dbfc,2,c012d9d8) at xptbustraverse+0x2b
xpt_for_all_devices(c012d9d8,c60e16f0) at xpt_for_all_devices+0x29
xpt_action(df16dc54,df16dc54,c60e1680,5,c60e1680) at xpt_action+0x667
cdinit(c6140400,c6346800,c6344800,df16dd00,c0131139) at cdinit+0x52
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(4,c0343f60,2,1,c61152c0) at malloc+0x3c
sysctl_add_oid(c61152c0,c035d2a8,ffffffff,df16d73c,80000001) at sysctl_add_oid+0xf2
cdregister(c6343800,df16d8d8,3,1,0) at cdregister+0x1a7
cam_periph_alloc(c0132e50,c0132a88,c0132b20,c0133bd0,c032829a,0,c60e10c0,c0132d30,80,df16d8d8) at cam_periph_alloc+0x1ef
cdasync(0,80,df16db38,df16d8d8,df16d8d8) at cdasync+0x6f
xptsetasyncfunc(c6344800,c60e16f0,df16db80,c012d7f6,c6344800) at xptsetasyncfunc+0x64
xptdefdevicefunc(c6344800,df16dbfc,c6341380,df16dbfc,c012d91c) at xptdefdevicefunc+0x15
xptdevicetraverse(c6341300,0,c012d944,df16dbfc,df16dbb4) at xptdevicetraverse+0x2a
xptdeftargetfunc(c6341300,df16dbfc,c6341240,df16dbfc,c012d8f4) at xptdeftargetfunc+0x26
xpttargettraverse(c6341400,0,c012d91c,df16dbfc,df16dbe8) at xpttargettraverse+0x2b
xptdefbusfunc(c6341400,df16dbfc) at xptdefbusfunc+0x26
xptbustraverse(0,c012d8f4,df16dbfc,2,c012d9d8) at xptbustraverse+0x2b
xpt_for_all_devices(c012d9d8,c60e16f0) at xpt_for_all_devices+0x29
xpt_action(df16dc54,df16dc54,c60e1680,5,c60e1680) at xpt_action+0x667
cdinit(c6140400,c6346800,c6344800,df16dd00,c0131139) at cdinit+0x52
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(e,c0343f60,2,df16d78c,1) at malloc+0x3c
sysctl_add_oid(c61152c0,c035d2a8,ffffffff,df16d73c,80000001) at sysctl_add_oid+0x12e
cdregister(c6343800,df16d8d8,3,1,0) at cdregister+0x1a7
cam_periph_alloc(c0132e50,c0132a88,c0132b20,c0133bd0,c032829a,0,c60e10c0,c0132d30,80,df16d8d8) at cam_periph_alloc+0x1ef
cdasync(0,80,df16db38,df16d8d8,df16d8d8) at cdasync+0x6f
xptsetasyncfunc(c6344800,c60e16f0,df16db80,c012d7f6,c6344800) at xptsetasyncfunc+0x64
xptdefdevicefunc(c6344800,df16dbfc,c6341380,df16dbfc,c012d91c) at xptdefdevicefunc+0x15
xptdevicetraverse(c6341300,0,c012d944,df16dbfc,df16dbb4) at xptdevicetraverse+0x2a
xptdeftargetfunc(c6341300,df16dbfc,c6341240,df16dbfc,c012d8f4) at xptdeftargetfunc+0x26
xpttargettraverse(c6341400,0,c012d91c,df16dbfc,df16dbe8) at xpttargettraverse+0x2b
xptdefbusfunc(c6341400,df16dbfc) at xptdefbusfunc+0x26
xptbustraverse(0,c012d8f4,df16dbfc,2,c012d9d8) at xptbustraverse+0x2b
xpt_for_all_devices(c012d9d8,c60e16f0) at xpt_for_all_devices+0x29
xpt_action(df16dc54,df16dc54,c60e1680,5,c60e1680) at xpt_action+0x667
cdinit(c6140400,c6346800,c6344800,df16dd00,c0131139) at cdinit+0x52
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(c,c0343f60,2,c60e11b0,2) at malloc+0x3c
sysctl_ctx_entry_add(c61152c0,c63413c0) at sysctl_ctx_entry_add+0x2a
sysctl_add_oid(c61152c0,c035d2a8,ffffffff,df16d73c,80000001) at sysctl_add_oid+0x153
cdregister(c6343800,df16d8d8,3,1,0) at cdregister+0x1a7
cam_periph_alloc(c0132e50,c0132a88,c0132b20,c0133bd0,c032829a,0,c60e10c0,c0132d30,80,df16d8d8) at cam_periph_alloc+0x1ef
cdasync(0,80,df16db38,df16d8d8,df16d8d8) at cdasync+0x6f
xptsetasyncfunc(c6344800,c60e16f0,df16db80,c012d7f6,c6344800) at xptsetasyncfunc+0x64
xptdefdevicefunc(c6344800,df16dbfc,c6341380,df16dbfc,c012d91c) at xptdefdevicefunc+0x15
xptdevicetraverse(c6341300,0,c012d944,df16dbfc,df16dbb4) at xptdevicetraverse+0x2a
xptdeftargetfunc(c6341300,df16dbfc,c6341240,df16dbfc,c012d8f4) at xptdeftargetfunc+0x26
xpttargettraverse(c6341400,0,c012d91c,df16dbfc,df16dbe8) at xpttargettraverse+0x2b
xptdefbusfunc(c6341400,df16dbfc) at xptdefbusfunc+0x26
xptbustraverse(0,c012d8f4,df16dbfc,2,c012d9d8) at xptbustraverse+0x2b
xpt_for_all_devices(c012d9d8,c60e16f0) at xpt_for_all_devices+0x29
xpt_action(df16dc54,df16dc54,c60e1680,5,c60e1680) at xpt_action+0x667
cdinit(c6140400,c6346800,c6344800,df16dd00,c0131139) at cdinit+0x52
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(2c,c0343f60,102,df16d78c,df16d78c) at malloc+0x3c
sysctl_add_oid(c61152c0,c60e12d0,ffffffff,c030f5b9,c0000002,c61152b8,0,c0132df0,c03295ed,c030f5ca) at sysctl_add_oid+0x7c
cdregister(c6343800,df16d8d8,3,1,0) at cdregister+0x2ba
cam_periph_alloc(c0132e50,c0132a88,c0132b20,c0133bd0,c032829a,0,c60e10c0,c0132d30,80,df16d8d8) at cam_periph_alloc+0x1ef
cdasync(0,80,df16db38,df16d8d8,df16d8d8) at cdasync+0x6f
xptsetasyncfunc(c6344800,c60e16f0,df16db80,c012d7f6,c6344800) at xptsetasyncfunc+0x64
xptdefdevicefunc(c6344800,df16dbfc,c6341380,df16dbfc,c012d91c) at xptdefdevicefunc+0x15
xptdevicetraverse(c6341300,0,c012d944,df16dbfc,df16dbb4) at xptdevicetraverse+0x2a
xptdeftargetfunc(c6341300,df16dbfc,c6341240,df16dbfc,c012d8f4) at xptdeftargetfunc+0x26
xpttargettraverse(c6341400,0,c012d91c,df16dbfc,df16dbe8) at xpttargettraverse+0x2b
xptdefbusfunc(c6341400,df16dbfc) at xptdefbusfunc+0x26
xptbustraverse(0,c012d8f4,df16dbfc,2,c012d9d8) at xptbustraverse+0x2b
xpt_for_all_devices(c012d9d8,c60e16f0) at xpt_for_all_devices+0x29
xpt_action(df16dc54,df16dc54,c60e1680,5,c60e1680) at xpt_action+0x667
cdinit(c6140400,c6346800,c6344800,df16dd00,c0131139) at cdinit+0x52
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(11,c0343f60,2,c030f5b9,2c) at malloc+0x3c
sysctl_add_oid(c61152c0,c60e12d0,ffffffff,c030f5b9,c0000002,c61152b8,0,c0132df0,c03295ed,c030f5ca) at sysctl_add_oid+0xaf
cdregister(c6343800,df16d8d8,3,1,0) at cdregister+0x2ba
cam_periph_alloc(c0132e50,c0132a88,c0132b20,c0133bd0,c032829a,0,c60e10c0,c0132d30,80,df16d8d8) at cam_periph_alloc+0x1ef
cdasync(0,80,df16db38,df16d8d8,df16d8d8) at cdasync+0x6f
xptsetasyncfunc(c6344800,c60e16f0,df16db80,c012d7f6,c6344800) at xptsetasyncfunc+0x64
xptdefdevicefunc(c6344800,df16dbfc,c6341380,df16dbfc,c012d91c) at xptdefdevicefunc+0x15
xptdevicetraverse(c6341300,0,c012d944,df16dbfc,df16dbb4) at xptdevicetraverse+0x2a
xptdeftargetfunc(c6341300,df16dbfc,c6341240,df16dbfc,c012d8f4) at xptdeftargetfunc+0x26
xpttargettraverse(c6341400,0,c012d91c,df16dbfc,df16dbe8) at xpttargettraverse+0x2b
xptdefbusfunc(c6341400,df16dbfc) at xptdefbusfunc+0x26
xptbustraverse(0,c012d8f4,df16dbfc,2,c012d9d8) at xptbustraverse+0x2b
xpt_for_all_devices(c012d9d8,c60e16f0) at xpt_for_all_devices+0x29
xpt_action(df16dc54,df16dc54,c60e1680,5,c60e1680) at xpt_action+0x667
cdinit(c6140400,c6346800,c6344800,df16dd00,c0131139) at cdinit+0x52
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(11,c0343f60,2,c030f5ca,10) at malloc+0x3c
sysctl_add_oid(c61152c0,c60e12d0,ffffffff,c030f5b9,c0000002,c61152b8,0,c0132df0,c03295ed,c030f5ca) at sysctl_add_oid+0x12e
cdregister(c6343800,df16d8d8,3,1,0) at cdregister+0x2ba
cam_periph_alloc(c0132e50,c0132a88,c0132b20,c0133bd0,c032829a,0,c60e10c0,c0132d30,80,df16d8d8) at cam_periph_alloc+0x1ef
cdasync(0,80,df16db38,df16d8d8,df16d8d8) at cdasync+0x6f
xptsetasyncfunc(c6344800,c60e16f0,df16db80,c012d7f6,c6344800) at xptsetasyncfunc+0x64
xptdefdevicefunc(c6344800,df16dbfc,c6341380,df16dbfc,c012d91c) at xptdefdevicefunc+0x15
xptdevicetraverse(c6341300,0,c012d944,df16dbfc,df16dbb4) at xptdevicetraverse+0x2a
xptdeftargetfunc(c6341300,df16dbfc,c6341240,df16dbfc,c012d8f4) at xptdeftargetfunc+0x26
xpttargettraverse(c6341400,0,c012d91c,df16dbfc,df16dbe8) at xpttargettraverse+0x2b
xptdefbusfunc(c6341400,df16dbfc) at xptdefbusfunc+0x26
xptbustraverse(0,c012d8f4,df16dbfc,2,c012d9d8) at xptbustraverse+0x2b
xpt_for_all_devices(c012d9d8,c60e16f0) at xpt_for_all_devices+0x29
xpt_action(df16dc54,df16dc54,c60e1680,5,c60e1680) at xpt_action+0x667
cdinit(c6140400,c6346800,c6344800,df16dd00,c0131139) at cdinit+0x52
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(c,c0343f60,2,c2193820,11) at malloc+0x3c
sysctl_ctx_entry_add(c61152c0,c63414c0) at sysctl_ctx_entry_add+0x2a
sysctl_add_oid(c61152c0,c60e12d0,ffffffff,c030f5b9,c0000002,c61152b8,0,c0132df0,c03295ed,c030f5ca) at sysctl_add_oid+0x153
cdregister(c6343800,df16d8d8,3,1,0) at cdregister+0x2ba
cam_periph_alloc(c0132e50,c0132a88,c0132b20,c0133bd0,c032829a,0,c60e10c0,c0132d30,80,df16d8d8) at cam_periph_alloc+0x1ef
cdasync(0,80,df16db38,df16d8d8,df16d8d8) at cdasync+0x6f
xptsetasyncfunc(c6344800,c60e16f0,df16db80,c012d7f6,c6344800) at xptsetasyncfunc+0x64
xptdefdevicefunc(c6344800,df16dbfc,c6341380,df16dbfc,c012d91c) at xptdefdevicefunc+0x15
xptdevicetraverse(c6341300,0,c012d944,df16dbfc,df16dbb4) at xptdevicetraverse+0x2a
xptdeftargetfunc(c6341300,df16dbfc,c6341240,df16dbfc,c012d8f4) at xptdeftargetfunc+0x26
xpttargettraverse(c6341400,0,c012d91c,df16dbfc,df16dbe8) at xpttargettraverse+0x2b
xptdefbusfunc(c6341400,df16dbfc) at xptdefbusfunc+0x26
xptbustraverse(0,c012d8f4,df16dbfc,2,c012d9d8) at xptbustraverse+0x2b
xpt_for_all_devices(c012d9d8,c60e16f0) at xpt_for_all_devices+0x29
xpt_action(df16dc54,df16dc54,c60e1680,5,c60e1680) at xpt_action+0x667
cdinit(c6140400,c6346800,c6344800,df16dd00,c0131139) at cdinit+0x52
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(d0,c0340080,502,f00,16) at malloc+0x3c
allocdev(c032829a,df16d78c,c0334600,df16d6f4,c01b4bc0) at allocdev+0x4d
makedev(f,0,df16d78c,df16d78c,df16d73c) at makedev+0x65
make_dev(c0334600,0,0,5,1a0) at make_dev+0x110
cdregister(c6343800,df16d8d8,3,1,0) at cdregister+0x305
cam_periph_alloc(c0132e50,c0132a88,c0132b20,c0133bd0,c032829a,0,c60e10c0,c0132d30,80,df16d8d8) at cam_periph_alloc+0x1ef
cdasync(0,80,df16db38,df16d8d8,df16d8d8) at cdasync+0x6f
xptsetasyncfunc(c6344800,c60e16f0,df16db80,c012d7f6,c6344800) at xptsetasyncfunc+0x64
xptdefdevicefunc(c6344800,df16dbfc,c6341380,df16dbfc,c012d91c) at xptdefdevicefunc+0x15
xptdevicetraverse(c6341300,0,c012d944,df16dbfc,df16dbb4) at xptdevicetraverse+0x2a
xptdeftargetfunc(c6341300,df16dbfc,c6341240,df16dbfc,c012d8f4) at xptdeftargetfunc+0x26
xpttargettraverse(c6341400,0,c012d91c,df16dbfc,df16dbe8) at xpttargettraverse+0x2b
xptdefbusfunc(c6341400,df16dbfc) at xptdefbusfunc+0x26
xptbustraverse(0,c012d8f4,df16dbfc,2,c012d9d8) at xptbustraverse+0x2b
xpt_for_all_devices(c012d9d8,c60e16f0) at xpt_for_all_devices+0x29
xpt_action(df16dc54,df16dc54,c60e1680,5,c60e1680) at xpt_action+0x667
cdinit(c6140400,c6346800,c6344800,df16dd00,c0131139) at cdinit+0x52
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(14,c03452e0,102,df16d78c,df16d78c) at malloc+0x3c
eventhandler_register(0,c030f499,c01329b0,c6115000,3e8) at eventhandler_register+0x1bb
cdregister(c6343800,df16d8d8,3,1,0) at cdregister+0x331
cam_periph_alloc(c0132e50,c0132a88,c0132b20,c0133bd0,c032829a,0,c60e10c0,c0132d30,80,df16d8d8) at cam_periph_alloc+0x1ef
cdasync(0,80,df16db38,df16d8d8,df16d8d8) at cdasync+0x6f
xptsetasyncfunc(c6344800,c60e16f0,df16db80,c012d7f6,c6344800) at xptsetasyncfunc+0x64
xptdefdevicefunc(c6344800,df16dbfc,c6341380,df16dbfc,c012d91c) at xptdefdevicefunc+0x15
xptdevicetraverse(c6341300,0,c012d944,df16dbfc,df16dbb4) at xptdevicetraverse+0x2a
xptdeftargetfunc(c6341300,df16dbfc,c6341240,df16dbfc,c012d8f4) at xptdeftargetfunc+0x26
xpttargettraverse(c6341400,0,c012d91c,df16dbfc,df16dbe8) at xpttargettraverse+0x2b
xptdefbusfunc(c6341400,df16dbfc) at xptdefbusfunc+0x26
xptbustraverse(0,c012d8f4,df16dbfc,2,c012d9d8) at xptbustraverse+0x2b
xpt_for_all_devices(c012d9d8,c60e16f0) at xpt_for_all_devices+0x29
xpt_action(df16dc54,df16dc54,c60e1680,5,c60e1680) at xpt_action+0x667
cdinit(c6140400,c6346800,c6344800,df16dd00,c0131139) at cdinit+0x52
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(63,c03452e0,2,1,3) at malloc+0x3c
eventhandler_register(0,c030fd7d,c0137e0c,0,2710,c0137da8,0,5dc) at eventhandler_register+0x9e
dainit(c6140400,c6346800,c6344800,df16dd00,c0131139) at dainit+0xaf
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(14,c03452e0,102,1,3) at malloc+0x3c
eventhandler_register(0,c030fd7d,c0137e0c,0,2710,c0137da8,0,5dc) at eventhandler_register+0x1bb
dainit(c6140400,c6346800,c6344800,df16dd00,c0131139) at dainit+0xaf
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
db> c
Debugger("malloc(M_WAITOK) in interrupt context")
Stopped at      Debugger+0x45:  xchgl   %ebx,in_Debugger.0
db> t
Debugger(c031a340) at Debugger+0x45
malloc(d0,c0340080,502,1f00,33) at malloc+0x3c
allocdev(c633b690,c6346c00,c0334c80,df16d7b8,c01b4bc0) at allocdev+0x4d
makedev(1f,0,c6346c00,df16d8d8,c6343500) at makedev+0x65
make_dev(c0334c80,0,0,5,180) at make_dev+0x110
passregister(c6343500,df16d8d8,3,1,0) at passregister+0xd8
cam_periph_alloc(c0138154,c0138010,c0138078,c0138390,c030b1c3) at cam_periph_alloc+0x1ef
passasync(0,80,df16db38,df16d8d8,df16d8d8) at passasync+0x47
xptsetasyncfunc(c6344800,c60e12a0,df16db80,c012d7f6,c6344800) at xptsetasyncfunc+0x64
xptdefdevicefunc(c6344800,df16dbfc,c6341380,df16dbfc,c012d91c) at xptdefdevicefunc+0x15
xptdevicetraverse(c6341300,0,c012d944,df16dbfc,df16dbb4) at xptdevicetraverse+0x2a
xptdeftargetfunc(c6341300,df16dbfc,c6341240,df16dbfc,c012d8f4) at xptdeftargetfunc+0x26
xpttargettraverse(c6341400,0,c012d91c,df16dbfc,df16dbe8) at xpttargettraverse+0x2b
xptdefbusfunc(c6341400,df16dbfc) at xptdefbusfunc+0x26
xptbustraverse(0,c012d8f4,df16dbfc,2,c012d9d8) at xptbustraverse+0x2b
xpt_for_all_devices(c012d9d8,c60e12a0) at xpt_for_all_devices+0x29
xpt_action(df16dc54,df16dc54,c60e1390,5,c60e1390) at xpt_action+0x667
passinit(c6140400,c6346800,c6344800,df16dd00,c0131139) at passinit+0x52
xpt_finishconfig(c21a8f00,c6140400) at xpt_finishconfig+0x65
camisr(c035d220) at camisr+0x1ed
ithread_loop(c21a8e00,df16dd48) at ithread_loop+0x174
fork_exit(c01c0fdc,c21a8e00,df16dd48) at fork_exit+0xa9
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xdf16dd7c, ebp = 0 ---
%%%

The only SCSI hardware on the machine is an ATAPI cd atached using atapicam
(and atapicd too).

The mallocs are actually in sysctl support code and other subsystems that
camisr wanders off into, so the fix isn't just to use M_NOWAIT.

Bruce