Hi,

Just saw this today when I had 8179 processes running at the same time. 
NetBSD 2.0 from a few days ago.

Aug 11 02:44:25 lain /netbsd: proc: table is full - increase kern.maxproc or NP
OC
panic: pmap_pvo_enter: failed
Begin traceback...
0xda0178b0: at pmap_pvo_enter+0x334
0xda017900: at pmap_enter+0x198
0xda017930: at ubc_fault+0x37c
0xda0179e0: at uvm_fault+0x1068
0xda017b10: at trap+0x2c0
0xda017b90: kernel DSI read trap @ 0xd57f4000 by memcpy+0x88: srr1=0x9032      0
             r1=0xda017c50 cr=0x40000024 xer=0x20000000 ctr=0xb6 
dsisr=0x4000000
0xda017c50: at ddbstk+0x1fa4
0xda017c60: at pmap_pvo_remove+0x230
0xda017cf0: at uiomove+0x1b0
0xda017d20: at ffs_read+0x4ac
0xda017dc0: at vn_read+0x114
0xda017e40: at dofileread+0xb8
0xda017eb0: at sys_read+0x8c
0xda017ed0: at syscall_plain+0xe0
0xda017f40: user SC trap #3 by 0x41873498: srr1=0xd032
             r1=0xffffd6b0 cr=0x20000044 xer=0 ctr=0x41901684
End traceback...
syncing disks... panic: pmap_pvo_enter: called recursively!
Begin traceback...
0xda0172c0: at pmap_pvo_enter+0x334
0xda017310: at pmap_kenter_pa+0xac
0xda017330: at uvm_pagermapin+0x1ac
0xda017360: at genfs_gop_write+0x114
0xda017420: at genfs_putpages+0x6e8
0xda017570: at ffs_putpages+0x3c
0xda017590: at ffs_full_fsync+0x31c
0xda017610: at ffs_fsync+0x74
0xda0176d0: at ffs_sync+0x320
0xda0177a0: at sys_sync+0x120
0xda0177d0: at vfs_shutdown+0x60
0xda0177f0: at cpu_reboot+0x1c0
0xda017820: at panic+0x188
0xda0178b0: at pmap_pvo_enter+0x334
0xda017900: at pmap_enter+0x198
0xda017930: at ubc_fault+0x37c
0xda0179e0: at uvm_fault+0x1068
0xda017b10: at trap+0x2c0
0xda017b90: kernel DSI read trap @ 0xd57f4000 by memcpy+0x88: srr1=0x9032      0
             r1=0xda017c50 cr=0x40000024 xer=0x20000000 ctr=0xb6 
dsisr=0x4000000
0xda017c50: at ddbstk+0x1fa4
0xda017c60: at pmap_pvo_remove+0x230
0xda017cf0: at uiomove+0x1b0
0xda017d20: at ffs_read+0x4ac
0xda017dc0: at vn_read+0x114
0xda017e40: at dofileread+0xb8
0xda017eb0: at sys_read+0x8c
0xda017ed0: at syscall_plain+0xe0
0xda017f40: user SC trap #3 by 0x41873498: srr1=0xd032
             r1=0xffffd6b0 cr=0x20000044 xer=0 ctr=0x41901684
End traceback...
dumpsys: TBD
sd3(esiop0:0:3:0): polling command not done
panic: scsipi_execute_xs
Begin traceback...
0xda0170b0: at scsipi_execute_xs+0x20c
0xda0170f0: at scsi_scsipi_cmd+0xec
0xda017130: at scsipi_command+0xb8
0xda017180: at sd_flush+0x98
0xda0171c0: at sd_shutdown+0x38
0xda0171e0: at doshutdownhooks+0x48
0xda017200: at cpu_reboot+0x88
0xda017230: at panic+0x188
0xda0172c0: at pmap_pvo_enter+0x334
0xda017310: at pmap_kenter_pa+0xac
0xda017330: at uvm_pagermapin+0x1ac
0xda017360: at genfs_gop_write+0x114
0xda017420: at genfs_putpages+0x6e8
0xda017570: at ffs_putpages+0x3c
0xda017590: at ffs_full_fsync+0x31c
0xda017610: at ffs_fsync+0x74
0xda0176d0: at ffs_sync+0x320
0xda0177a0: at sys_sync+0x120
0xda0177d0: at vfs_shutdown+0x60
0xda0177f0: at cpu_reboot+0x1c0
0xda017820: at panic+0x188
0xda0178b0: at pmap_pvo_enter+0x334
0xda017900: at pmap_enter+0x198
0xda017930: at ubc_fault+0x37c
0xda0179e0: at uvm_fault+0x1068
0xda017b10: at trap+0x2c0
0xda017b90: kernel DSI read trap @ 0xd57f4000 by memcpy+0x88: srr1=0x9032      0
             r1=0xda017c50 cr=0x40000024 xer=0x20000000 ctr=0xb6 
dsisr=0x4000000
0xda017c50: at ddbstk+0x1fa4
0xda017c60: at pmap_pvo_remove+0x230
0xda017cf0: at uiomove+0x1b0
0xda017d20: at ffs_read+0x4ac
0xda017dc0: at vn_read+0x114
0xda017420: at genfs_putpages+0x6e8
0xda017570: at ffs_putpages+0x3c
0xda017590: at ffs_full_fsync+0x31c
0xda017610: at ffs_fsync+0x74
0xda0176d0: at ffs_sync+0x320
0xda0177a0: at sys_sync+0x120
0xda0177d0: at vfs_shutdown+0x60
0xda0177f0: at cpu_reboot+0x1c0
0xda017820: at panic+0x188
0xda0178b0: at pmap_pvo_enter+0x334
0xda017900: at pmap_enter+0x198
0xda017930: at ubc_fault+0x37c
0xda0179e0: at uvm_fault+0x1068
0xda017b10: at trap+0x2c0
0xda017b90: kernel DSI read trap @ 0xd57f4000 by memcpy+0x88: srr1=0x9032      0
             r1=0xda017c50 cr=0x40000024 xer=0x20000000 ctr=0xb6 
dsisr=0x4000000
0xda017c50: at ddbstk+0x1fa4
0xda017c60: at pmap_pvo_remove+0x230
0xda017cf0: at uiomove+0x1b0
0xda017d20: at ffs_read+0x4ac
0xda017dc0: at vn_read+0x114
0xda017e40: at dofileread+0xb8
0xda017eb0: at sys_read+0x8c
0xda017ed0: at syscall_plain+0xe0
0xda017f40: user SC trap #3 by 0x41873498: srr1=0xd032
             r1=0xffffd6b0 cr=0x20000044 xer=0 ctr=0x41901684
End traceback...
dumpsys: TBD
sd2(esiop0:0:2:0): failed to enqueue polling command, retrying...
sd2(esiop0:0:2:0): failed to enqueue polling command, retrying...
sd2(esiop0:0:2:0): failed to enqueue polling command, retrying...
sd2(esiop0:0:2:0): failed to enqueue polling command, retrying...
sd2(esiop0:0:2:0): failed to enqueue polling command
sd2: cache synchronization failed
sd1(esiop0:0:1:0): failed to enqueue polling command, retrying...
sd1(esiop0:0:1:0): failed to enqueue polling command, retrying...
sd1(esiop0:0:1:0): failed to enqueue polling command, retrying...
sd1(esiop0:0:1:0): failed to enqueue polling command, retrying...
sd1(esiop0:0:1:0): failed to enqueue polling command
sd1: cache synchronization failed
sd0(esiop0:0:0:0): failed to enqueue polling command, retrying...
sd0(esiop0:0:0:0): failed to enqueue polling command, retrying...
sd0(esiop0:0:0:0): failed to enqueue polling command, retrying...
sd0(esiop0:0:0:0): failed to enqueue polling command, retrying...
sd0(esiop0:0:0:0): failed to enqueue polling command
sd0: cache synchronization failed
panic: wdc_exec_command: polled command not done
Begin traceback...
0xda016f60: at wdc_exec_command+0x1bc
0xda016f90: at wd_flushcache+0x98
0xda016fd0: at doshutdownhooks+0x48
0xda016ff0: at cpu_reboot+0x88
0xda017020: at panic+0x188
0xda0170b0: at scsipi_execute_xs+0x20c
0xda0170f0: at scsi_scsipi_cmd+0xec
0xda017130: at scsipi_command+0xb8
0xda017180: at sd_flush+0x98
0xda0171c0: at sd_shutdown+0x38
0xda0171e0: at doshutdownhooks+0x48
0xda017200: at cpu_reboot+0x88
0xda017230: at panic+0x188
0xda0172c0: at pmap_pvo_enter+0x334
0xda017310: at pmap_kenter_pa+0xac
0xda017330: at uvm_pagermapin+0x1ac
0xda017360: at genfs_gop_write+0x114
0xda017420: at genfs_putpages+0x6e8
0xda017570: at ffs_putpages+0x3c
0xda017590: at ffs_full_fsync+0x31c
0xda017610: at ffs_fsync+0x74
0xda0176d0: at ffs_sync+0x320
0xda0177a0: at sys_sync+0x120
0xda0177d0: at vfs_shutdown+0x60
0xda0177f0: at cpu_reboot+0x1c0
0xda017820: at panic+0x188
0xda0178b0: at pmap_pvo_enter+0x334
0xda017900: at pmap_enter+0x198
0xda017930: at ubc_fault+0x37c
0xda0179e0: at uvm_fault+0x1068
0xda017b10: at trap+0x2c0
0xda017b90: kernel DSI read trap @ 0xd57f4000 by memcpy+0x88: srr1=0x9032      0
             r1=0xda017c50 cr=0x40000024 xer=0x20000000 ctr=0xb6 
dsisr=0x4000000
0xda017c50: at ddbstk+0x1fa4
0xda017c60: at pmap_pvo_remove+0x230
0xda017cf0: at uiomove+0x1b0
0xda017d20: at ffs_read+0x4ac
0xda017dc0: at vn_read+0x114
0xda017e40: at dofileread+0xb8
0xda017eb0: at sys_read+0x8c
0xda017ed0: at syscall_plain+0xe0
0xda017f40: user SC trap #3 by 0x41873498: srr1=0xd032
             r1=0xffffd6b0 cr=0x20000044 xer=0 ctr=0x41901684
End traceback...
dumpsys: TBD
rebooting