panic at reboot (spin lock held too long)

[Thierry Herbelot]

Hello,

on reboot after installing the new world, I get a familiar panic :
(this is with a straight current -Current GENERIC kernel on an SMP oldish BP6)

	TfH

cpu_reset: Stopping other CPUs
spin lock sched lock held by 0xc16ec340 for > 5 seconds
panic: spin lock held too long
cpuid = 0
KDB: enter: panic
[thread pid 19061 tid 100100 ]
Stopped at      kdb_enter+0x2b: nop
db> where
Tracing pid 19061 tid 100100 td 0xc19714e0
kdb_enter(c08878d2) at kdb_enter+0x2b
panic(c0886b94,c09547b0,c16ec340,c0886b6b,c0886cc5) at panic+0x127
_mtx_lock_spin(c09547b0,c19714e0,2,c08834f6,cb) at _mtx_lock_spin+0xa8
_mtx_lock_spin_flags(c09547b0,2,c08834f6,cb) at _mtx_lock_spin_flags+0xaa
hardclock_cpu(0,c09d4de0,0,c7656ba4,c080d121) at hardclock_cpu+0x25
hardclock(0,c081cf1e) at hardclock+0x13
lapic_handle_timer(8,28,c16b0028,c16ba00c,0) at lapic_handle_timer+0x71
Xtimerint() at Xtimerint+0x1e
--- interrupt, eip = 0xc081cf1e, esp = 0xc7656bec, ebp = 0xc7656c10 ---
DELAY(f4240) at DELAY+0x92
cpu_reset(f4240,c0887ab9,c7656c68,c0656e57,0) at cpu_reset+0xc8
shutdown_reset(0,0,c16ba00c,0,c08878f6) at shutdown_reset+0x1c
boot(0,c09547c8,0,c08878f6,a2) at boot+0x55b
reboot(c19714e0,c7656d04,c7656ccc,c065da4c,c19714e0) at reboot+0x32
syscall(3b,3b,3b,0,2) at syscall+0x27a
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (55, FreeBSD ELF32, reboot), eip = 0x280adf6f, esp = 0xbfbfedcc, 
ebp = 0xbfbfee18 ---
db> sh locks
exclusive sleep mutex Giant r = 0 (0xc09547c8) locked 
@ /files1/src/sys/kern/vfs_syscalls.c:124
db> ps
  pid   proc     uid  ppid  pgrp  flag   stat  wmesg    wchan  cmd
19061 c1f0f448    0     1 19061 0004002 [CPU 0] reboot
   41 c18a5ab4    0     0     0 0000204 [SLPQ - 0xc72cfd04][SLP] schedcpu
   40 c18a5cd8    0     0     0 0000204 [SLPQ - 0xc09a8cac][SLP] nfsiod 3
   39 c18a7000    0     0     0 0000204 [SLPQ - 0xc09a8ca8][SLP] nfsiod 2
   38 c17adcd8    0     0     0 0000204 [SLPQ - 0xc09a8ca4][SLP] nfsiod 1
   37 c182c000    0     0     0 0000204 [SLPQ - 0xc09a8ca0][SLP] nfsiod 0
   36 c182c224    0     0     0 0000204 [SLPQ ktsusp 0xc182c2a8][SLP] vnlru
   35 c182c448    0     0     0 0000204 [SLPQ ktsusp 0xc182c4cc][SLP] syncer
   34 c182c66c    0     0     0 0000204 [SLPQ ktsusp 0xc182c6f0][SLP] 
bufdaemon
   33 c182c890    0     0     0 000020c [SLPQ pgzero 0xc09b6bd0][SLP] pagezero
   32 c182cab4    0     0     0 0000204 [SLPQ psleep 0xc09aeafc][SLP] vmdaemon
   31 c182ccd8    0     0     0 0000204 [SLPQ psleep 0xc09aeabc][SLP] 
pagedaemon
   30 c182f448    0     0     0 0000204 [IWAIT] irq5: pcm1
    7 c170166c    0     0     0 0000204 [SLPQ - 0xc16d2c3c][SLP] fdc0
   29 c1701890    0     0     0 0000204 [IWAIT] swi0: sio
   28 c1701ab4    0     0     0 0000204 [IWAIT] irq7: ppc0
   27 c1701cd8    0     0     0 0000204 [IWAIT] irq1: atkbd0
   26 c17ad000    0     0     0 0000204 [IWAIT] irq17: atapci1
   25 c17ad224    0     0     0 0000204 [IWAIT] irq18: pcm0++
   24 c17ad448    0     0     0 0000204 [SLPQ usbtsk 0xc09525a4][SLP] usbtask
   23 c17ad66c    0     0     0 0000204 [SLPQ usbevt 0xc16be210][SLP] usb0
   22 c17ad890    0     0     0 0000204 [IWAIT] irq19: dc0 uhci0
   21 c17adab4    0     0     0 0000204 [IWAIT] irq15: ata1
   20 c16f0224    0     0     0 0000204 [IWAIT] irq14: ata0
   19 c16f0448    0     0     0 0000204 [IWAIT] swi2: cambio
   18 c16f066c    0     0     0 0000204 [IWAIT] swi5: +
    6 c16f0890    0     0     0 0000204 [SLPQ - 0xc179f500][SLP] thread taskq
   17 c16f0ab4    0     0     0 0000204 [IWAIT] swi6: Giant taskq
   16 c16f0cd8    0     0     0 0000204 [IWAIT] swi6: task queue
    5 c1701000    0     0     0 0000204 [SLPQ - 0xc16ea580][SLP] kqueue taskq
   15 c1701224    0     0     0 0000204 [SLPQ - 0xc0950200][SLP] yarrow
    4 c1701448    0     0     0 0000204 [SLPQ - 0xc0952d1c][SLP] g_down
    3 c16eb000    0     0     0 0000204 [SLPQ - 0xc0952d18][SLP] g_up
    2 c16eb224    0     0     0 0000204 [RUNQ] g_event
   14 c16eb448    0     0     0 0000204 [IWAIT] swi1: net
   13 c16eb66c    0     0     0 0000204 [IWAIT] swi3: vm
   12 c16eb890    0     0     0 000020c [LOCK  Giant c1824c80] swi4: clock sio
   11 c16ebab4    0     0     0 000020c [Can run] idle: cpu0
   10 c16ebcd8    0     0     0 000020c [Can run] idle: cpu1
    1 c16f0000    0     0     1 0004200 [CPU 1] init
    0 c0952e20    0     0     0 0000200 [IWAIT] swapper
    8 c182f224    0     1     0 0002204 zomb[INACTIVE] g_mirror gm0s1
db>