2.5.64-mm7

2.5.64-mm7

[Andrew Morton]

ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.5/2.5.64/2.5.64-mm7/

  kernel.org rsync seems broken, so it is also at

http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.64/2.5.64-mm7/


. Niggling bugs in the anticipatory scheduler are causing problems.  I've
  reset the default to elevator=deadline until we get these fixed up.

. Added Alex's ext2 lock_super-removal patches

. The brlock removal patches are back

. Added /proc/sysrq-trigger.  Writing a character to this has the same
  effect as typing ALT-sysrq-that_character.

  This is so that sysrq facilities are available remotely.

. Lots of new PCI handling code here from Russell King <rmk@arm.linux.org.uk>




Changes since 2.5.64-mm6:


-nfsd-disable-softirq.patch
-lockd-lockup-fix-2.patch
-reiserfs-fix-memleaks.patch
-nfsd-memleak-fix.patch

 Merged

+as-eject-BUG-fix.patch

 Fix an anticipatory scheduler BUG when cdroms are ejected

+deadline-default.patch

 Default to deadline scheduler

+scheduler-starvation-fixes.patch

 CPU scheduler tweaks

+timer-cleanup.patch
+timer-readdition-fix.patch

 Fix timer livelock

+oprofile-timer-fix.patch

 Oprofile fix

+htree-nfs-fix-2.patch

 Another fix for ext3/htree on NFS servers

+ext2-balloc-fix.patch

 Fix logic in the ext2 block allocator

+ext2-no-lock_super.patch
+ext2-no-lock-super-whitespace-fixes.patch
+ext2-no-lock_super-fix-1.patch
+ext2-no-lock_super-fix-2.patch
+ext2-no-lock_super-fix-3.patch
+ext2-no-lock_super-fix-4.patch
+ext2-no-lock_super-fix-5.patch
+ext2-no-lock_super-fix-6.patch
+ext2-no-lock_super-fix-7.patch

 Removal of lock_super in the ext2 block allocator

+brlock-removal-1.patch
+brlock-removal-2.patch
+brlock-removal-3.patch
+brlock-removal-4.patch
+brlock-removal-5.patch

 Second pass of the brlock removal patches

+pgd_index-comments.patch

 Add some comments

+pci-6.patch
+pci-7.patch
+pci-8.patch
+pci-9.patch
+pci-10.patch
+pci-11.patch
+pci-12.patch
+pci-13.patch
+pci-14.patch
+pci-15.patch

 Some of Russell King's PCI patches.

+proc-sysrq-trigger.patch

 Create /proc/sysrq-trigger

+aio-bits-fix.patch

 AIO fixes

+clean-inode-fix.patch

 Forgot to initialise inode->i_rdev




All 116 patches:

linus.patch
  Latest from Linus

mm.patch
  add -mmN to EXTRAVERSION

kgdb.patch

noirqbalance-fix.patch
  Fix noirqbalance

config_spinline.patch
  uninline spinlocks for profiling accuracy.

ppc64-reloc_hide.patch

ppc64-pci-patch.patch
  Subject: pci patch

ppc64-aio-32bit-emulation.patch
  32/64bit emulation for aio

ppc64-64-bit-exec-fix.patch
  Pass the load address into ELF_PLAT_INIT()

ppc64-scruffiness.patch
  Fix some PPC64 compile warnings

ppc64-compat-flock.patch
  compat_sys_fcntl{,64} 2/9 ppc64 part

ppc64-eeh-fix.patch
  ppc64 build fix

ppc64-socketcall-fix.patch

sym-do-160.patch
  make the SYM driver do 160 MB/sec

config-PAGE_OFFSET.patch
  Configurable kenrel/user memory split

ptrace-flush.patch
  cache flushing in the ptrace code

buffer-debug.patch
  buffer.c debugging

warn-null-wakeup.patch

ext3-truncate-ordered-pages.patch
  ext3: explicitly free truncated pages

reiserfs_file_write-5.patch

tcp-wakeups.patch
  Use fast wakeups in TCP/IPV4

rcu-stats.patch
  RCU statistics reporting

ext3-journalled-data-assertion-fix.patch
  Remove incorrect assertion from ext3

nfs-speedup.patch

nfs-oom-fix.patch
  nfs oom fix

sk-allocation.patch
  Subject: Re: nfs oom

nfs-more-oom-fix.patch

rpciod-atomic-allocations.patch
  Make rcpiod use atomic allocations

linux-isp.patch

isp-update-1.patch

remove-unused-congestion-stuff.patch
  Subject: [PATCH] remove unused congestion stuff

as-iosched.patch
  anticipatory I/O scheduler

as-debug-BUG-fix.patch

as-eject-BUG-fix.patch
  AS: don't go BUG during cdrom eject

cfq-2.patch
  CFQ scheduler, #2

deadline-default.patch
  deafult to deadline IO scheduler

smalldevfs.patch
  smalldevfs

remap-file-pages-2.5.63-a1.patch
  Subject: [patch] remap-file-pages-2.5.63-A1

hugh-remap-fix.patch
  hugh's file-offset-in-pte fix

fremap-limit-offsets.patch
  fremap: limit remap_file_pages() file offsets

fremap-all-mappings.patch
  Make all executable mappings be nonlinear

filemap_populate-speedup.patch
  filemap_populate speedup

file-offset-in-pte-x86_64.patch
  x86_64: support for file offsets in pte's

file-offset-in-pte-ppc64.patch

objrmap-2.5.62-5.patch
  object-based rmap

objrmap-nonlinear-fixes.patch
  objrmap fix for nonlinear

scheduler-tunables.patch
  scheduler tunables

scheduler-starvation-fixes.patch
  CPU scheduler starvation fixes

timer-cleanup.patch
  timer code cleanup

timer-readdition-fix.patch
  timer re-addition lockup fix

show_task-free-stack-fix.patch
  show_task() fix and cleanup

yellowfin-set_bit-fix.patch
  yellowfin driver set_bit fix

htree-nfs-fix.patch
  Fix ext3 htree / NFS compatibility problems

update_atime-ng.patch
  inode a/c/mtime modification speedup

one-sec-times.patch
  Implement a/c/time speedup in ext2 & ext3

task_prio-fix.patch
  simple task_prio() fix

register-tty_devclass.patch
  Register tty_devclass before use

set_current_state-fs.patch
  use set_current_state in fs

set_current_state-mm.patch
  use set_current_state in mm

copy_thread-leak-fix.patch
  Fix memory leak in copy_thread

slab_store_user-large-objects.patch
  slab debug: perform redzoning against larger objects

file_list_lock-contention-fix.patch
  file_list_lock contention fixes

tty_files-fixes.patch
  file->f_list locking in tty_io.c

file_list_cleanup.patch
  file_list cleanup

file_list-remove-free_list.patch
  file_table: remove the private freelist

file-list-less-locking.patch
  file_list: less locking

vt_ioctl-stack-use.patch
  stack reduction in drivers/char/vt_ioctl.c

fix-mem-equals.patch
  Fix mem= options

no-mmu-stubs.patch
  a few missing stubs for !CONFIG_MMU

nommu-slab.patch
  slab changes for !CONFIG_MMU

nfs-memleak-fix.patch
  memleak in fs/nfs/inode.c::nfs_get_sb()

ufs-memleak-fix.patch
  Memleak in fs/ufs/util.c

hugetlb-unmap_vmas-fix.patch
  fix the fix for unmap_vmas & hugepages

early-writeback-init.patch
  Early writeback initialisation

posix-timers-update.patch
  posix timers update

e100-memleak-fix.patch
  Memleak in e100 driver

pcmcia-1-kill-get_foo_map.patch
  pcmcia: 1/6 kill get_*_map

pcmcia-2-remove-bus_foo-abstractions.patch
  pcmcia: 2/6: Remove bus_* abstractions

pcmcia-3-add-SOCKET_CARDBUS_CONFIG.patch
  pcmcia: 3/6: add SOCKET_CARDBUS_CONFIG flag

pcmcia-4-add-locking.patch
  pcmcia: 4/6: Add some locking to rsrc_mgr.c

pcmcia-5-add-CONFIG_PCMCIA_PROBE.patch
  pcmcia 5/6: Introduce CONFIG_PCMCIA_PROBE

pcmcia-6-remove-old-cardbus-clients.patch
  pcmcia: 6/6: Remove support for old cardbus clients

oops-counters.patch
  OOPS instance counters

io_apic-DO_ACTION-cleanup.patch
  io-apic.c: DO_ACTION cleanup

ext2-ext3-noatime-fix.patch
  Ext2/3 noatime and dirsync sometimes ignored

oprofile-timer-fix.patch
  fix oprofile timer race

htree-nfs-fix-2.patch
  htree nfs fix

ext2-balloc-fix.patch
  ext2: block allocation fix

ext2-no-lock_super.patch
  concurrent block allocation for ext2

ext2-no-lock-super-whitespace-fixes.patch

ext2-no-lock_super-fix-1.patch

ext2-no-lock_super-fix-2.patch

ext2-no-lock_super-fix-3.patch

ext2-no-lock_super-fix-4.patch

ext2-no-lock_super-fix-5.patch

ext2-no-lock_super-fix-6.patch

ext2-no-lock_super-fix-7.patch

brlock-removal-1.patch
  Brlock removal 1/5 - core

brlock-removal-2.patch
  brlock removal 2/5: remove brlock from snap and vlan

brlock-removal-3.patch
  brlock removal 3/5: remove brlock from bridge

brlock-removal-4.patch
  brlock removal 4/5: removal from ipv4/ipv6

brlock-removal-5.patch
  brlock removal 5/5: remove brlock code

pgd_index-comments.patch
  pgd_index/pmd_index/pte_index commentary

pci-6.patch

pci-7.patch

pci-8.patch

pci-9.patch

pci-10.patch

pci-11.patch

pci-12.patch

pci-13.patch

pci-14.patch

pci-15.patch

proc-sysrq-trigger.patch
  /proc/sysrq-trigger: trigger sysrq functions via /proc

aio-bits-fix.patch
  kiocbClear should use clear_bit instead of set_bit

clean-inode-fix.patch
  initialise inode->i_rdev



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Re: 2.5.64-mm7

[Russell King]

> +pci-6.patch
> +pci-7.patch
> +pci-8.patch
> +pci-9.patch
> +pci-10.patch
> +pci-11.patch
> +pci-12.patch
> +pci-13.patch
> +pci-14.patch
> +pci-15.patch
> 
>  Some of Russell King's PCI patches.

Following comments from Ivan, the following patches changed:

pci-9

  only enable ROM resources if res->flags has PCI_ROM_ADDRESS_ENABLE set.

pci-10

  don't use PCI_BUS_NUM_RESOURCES here - PPC machines can (in theory) have
  more than 4 primary bus resources.

pci-11

  breaks Alpha Nautilus host bridge sizing - patch dropped from patch set.

For those trying the above out, please apply the following patch on top of
-mm7:

diff -ur orig/drivers/pci/setup-res.c linux/drivers/pci/setup-res.c
--- orig/drivers/pci/setup-res.c	Sat Mar 15 09:54:19 2003
+++ linux/drivers/pci/setup-res.c	Sat Mar 15 09:55:38 2003
@@ -55,8 +55,7 @@
 	if (resno < 6) {
 		reg = PCI_BASE_ADDRESS_0 + 4 * resno;
 	} else if (resno == PCI_ROM_RESOURCE) {
-		res->flags |= PCI_ROM_ADDRESS_ENABLE;
-		new |= PCI_ROM_ADDRESS_ENABLE;
+		new |= res->flags & PCI_ROM_ADDRESS_ENABLE;
 		reg = dev->rom_base_reg;
 	} else {
 		/* Hmm, non-standard resource. */
diff -ur orig/drivers/pci/probe.c linux/drivers/pci/probe.c
--- orig/drivers/pci/probe.c	Sat Mar 15 09:59:15 2003
+++ linux/drivers/pci/probe.c	Sat Mar 15 09:58:47 2003
@@ -256,7 +256,7 @@
 		child->subordinate = 0xff;
 
 		/* Set up default resource pointers and names.. */
-		for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
+		for (i = 0; i < 4; i++) {
 			child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
 			child->resource[i]->name = child->name;
 		}
diff -ur orig/drivers/pci/setup-bus.c linux/drivers/pci/setup-bus.c
--- orig/drivers/pci/setup-bus.c	Sat Mar 15 10:01:05 2003
+++ linux/drivers/pci/setup-bus.c	Sat Mar 15 09:58:44 2003
@@ -36,13 +36,6 @@
 
 #define ROUND_UP(x, a)		(((x) + (a) - 1) & ~((a) - 1))
 
-/*
- * FIXME: IO should be max 256 bytes.  However, since we may
- * have a P2P bridge below a cardbus bridge, we need 4K.
- */
-#define CARDBUS_IO_SIZE		(4096)
-#define CARDBUS_MEM_SIZE	(32*1024*1024)
-
 static int __devinit
 pbus_assign_resources_sorted(struct pci_bus *bus)
 {
@@ -74,59 +67,6 @@
 	return found_vga;
 }
 
-static void __devinit pci_setup_cardbus(struct pci_bus *bus)
-{
-	struct pci_dev *bridge = bus->self;
-	struct pci_bus_region region;
-
-	printk("PCI: Bus %d, cardbus bridge: %s\n",
-		bus->number, bridge->slot_name);
-
-	pcibios_resource_to_bus(bridge, &region, bus->resource[0]);
-	if (bus->resource[0]->flags & IORESOURCE_IO) {
-		/*
-		 * The IO resource is allocated a range twice as large as it
-		 * would normally need.  This allows us to set both IO regs.
-		 */
-		printk("  IO window: %08lx-%08lx\n",
-			region.start, region.end);
-		pci_write_config_dword(bridge, PCI_CB_IO_BASE_0,
-					region.start);
-		pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0,
-					region.end);
-	}
-
-	pcibios_resource_to_bus(bridge, &region, bus->resource[1]);
-	if (bus->resource[1]->flags & IORESOURCE_IO) {
-		printk("  IO window: %08lx-%08lx\n",
-			region.start, region.end);
-		pci_write_config_dword(bridge, PCI_CB_IO_BASE_1,
-					region.start);
-		pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1,
-					region.end);
-	}
-
-	pcibios_resource_to_bus(bridge, &region, bus->resource[2]);
-	if (bus->resource[2]->flags & IORESOURCE_MEM) {
-		printk("  PREFETCH window: %08lx-%08lx\n",
-			region.start, region.end);
-		pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0,
-					region.start);
-		pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0,
-					region.end);
-	}
-
-	pcibios_resource_to_bus(bridge, &region, bus->resource[3]);
-	if (bus->resource[3]->flags & IORESOURCE_MEM) {
-		printk("  MEM window: %08lx-%08lx\n",
-			region.start, region.end);
-		pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1,
-					region.start);
-		pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1,
-					region.end);
-	}
-}
-
 /* Initialize bridges with base/limit values we have collected.
    PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998)
    requires that if there is no I/O ports or memory behind the
@@ -214,6 +154,9 @@
 	struct pci_dev *bridge = bus->self;
 	struct resource *b_res;
 
+	if (!bridge || (bridge->class >> 8) != PCI_CLASS_BRIDGE_PCI)
+		return;
+
 	b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
 	b_res[1].flags |= IORESOURCE_MEM;
 
@@ -245,10 +188,11 @@
    since these windows have 4K granularity and the IO ranges
    of non-bridge PCI devices are limited to 256 bytes.
    We must be careful with the ISA aliasing though. */
-static void __devinit pbus_size_io(struct pci_bus *bus, int resno)
+static void __devinit
+pbus_size_io(struct pci_bus *bus)
 {
 	struct pci_dev *dev;
-	struct resource *b_res = bus->resource[resno];
+	struct resource *b_res = bus->resource[0];
 	unsigned long size = 0, size1 = 0;
 
 	if (!(b_res->flags & IORESOURCE_IO))
@@ -271,6 +215,9 @@
 			else
 				size1 += r_size;
 		}
+		/* ??? Reserve some resources for CardBus. */
+		if ((dev->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS)
+			size1 += 4*1024;
 	}
 /* To be fixed in 2.5: we should have sort of HAVE_ISA
    flag in the struct pci_bus. */
@@ -290,13 +237,14 @@
 /* Calculate the size of the bus and minimal alignment which
    guarantees that all child resources fit in this size. */
 static void __devinit
-pbus_size_mem(struct pci_bus *bus, int resno, unsigned long mask, unsigned long type)
+pbus_size_mem(struct pci_bus *bus, unsigned long mask, unsigned long type)
 {
-	struct resource *b_res = bus->resource[resno];
 	struct pci_dev *dev;
 	unsigned long min_align, align, size;
 	unsigned long aligns[12];	/* Alignments from 1Mb to 2Gb */
 	int order, max_order;
+	struct resource *b_res = (type & IORESOURCE_PREFETCH) ?
+				 bus->resource[2] : bus->resource[1];
 
 	memset(aligns, 0, sizeof(aligns));
 	max_order = 0;
@@ -332,6 +280,11 @@
 			if (order > max_order)
 				max_order = order;
 		}
+		/* ??? Reserve some resources for CardBus. */
+		if ((dev->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
+			size += 1UL << 24;		/* 16 Mb */
+			aligns[24 - 20] += 1UL << 24;
+		}
 	}
 
 	align = 0;
@@ -354,104 +307,37 @@
 	b_res->end = size + min_align - 1;
 }
 
-static void __devinit pci_bus_size_cardbus(struct pci_bus *bus)
-{
-	struct pci_dev *bridge = bus->self;
-	struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
-	u16 ctrl;
-
-	/*
-	 * Reserve some resources for CardBus.  We reserve
-	 * a fixed amount of bus space for CardBus bridges.
-	 */
-	b_res[0].start = CARDBUS_IO_SIZE;
-	b_res[0].end = b_res[0].start + CARDBUS_IO_SIZE - 1;
-	b_res[0].flags |= IORESOURCE_IO;
-
-	b_res[1].start = CARDBUS_IO_SIZE;
-	b_res[1].end = b_res[1].start + CARDBUS_IO_SIZE - 1;
-	b_res[1].flags |= IORESOURCE_IO;
-
-	/*
-	 * Check whether prefetchable memory is supported
-	 * by this bridge.
-	 */
-	pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
-	if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) {
-		ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
-		pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
-		pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
-	}
-
-	/*
-	 * If we have prefetchable memory support, allocate
-	 * two regions.  Otherwise, allocate one region of
-	 * twice the size.
-	 */
-	if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
-		b_res[2].start = CARDBUS_MEM_SIZE;
-		b_res[2].end = b_res[2].start + CARDBUS_MEM_SIZE - 1;
-		b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
-
-		b_res[3].start = CARDBUS_MEM_SIZE;
-		b_res[3].end = b_res[3].start + CARDBUS_MEM_SIZE - 1;
-		b_res[3].flags |= IORESOURCE_MEM;
-	} else {
-		b_res[3].start = CARDBUS_MEM_SIZE * 2;
-		b_res[3].end = b_res[3].start + CARDBUS_MEM_SIZE * 2 - 1;
-		b_res[3].flags |= IORESOURCE_MEM;
-	}
-}
-
 void __devinit
 pci_bus_size_bridges(struct pci_bus *bus)
 {
-	struct pci_dev *dev;
-	unsigned long mask;
+	struct pci_bus *b;
+	unsigned long mask, type;
 
-	list_for_each_entry(dev, &bus->devices, bus_list) {
-		struct pci_bus *b = dev->subordinate;
-		if (!b)
-			continue;
-
-		switch (dev->class >> 8) {
-		case PCI_CLASS_BRIDGE_PCI:
-			pci_bus_size_bridges(b);
-			break;
-
-		case PCI_CLASS_BRIDGE_CARDBUS:
-			pci_bus_size_cardbus(b);
-			break;
-		}
+	list_for_each_entry(b, &bus->children, node) {
+		pci_bus_size_bridges(b);
 	}
 
 	/* The root bus? */
 	if (!bus->self)
 		return;
 
-	switch (bus->self->class >> 8) {
-	case PCI_CLASS_BRIDGE_PCI:
-		pci_bridge_check_ranges(bus);
-		pbus_size_io(bus, 0);
-		mask = IORESOURCE_MEM;
-		/* If the bridge supports prefetchable range, size it separately. */
-		if (bus->resource[2] &&
-		    bus->resource[2]->flags & IORESOURCE_PREFETCH) {
-			pbus_size_mem(bus, 2, IORESOURCE_PREFETCH | IORESOURCE_MEM,
-				      IORESOURCE_PREFETCH | IORESOURCE_MEM);
-			mask |= IORESOURCE_PREFETCH;	/* Size non-prefetch only. */
-		}
-		pbus_size_mem(bus, 1, mask, IORESOURCE_MEM);
-		break;
+	pci_bridge_check_ranges(bus);
+
+	pbus_size_io(bus);
 
-	case PCI_CLASS_BRIDGE_CARDBUS:
-		/* don't size cardbuses yet. */
-		break;
+	mask = type = IORESOURCE_MEM;
+	/* If the bridge supports prefetchable range, size it separately. */
+	if (bus->resource[2] &&
+	    bus->resource[2]->flags & IORESOURCE_PREFETCH) {
+		pbus_size_mem(bus, IORESOURCE_PREFETCH, IORESOURCE_PREFETCH);
+		mask |= IORESOURCE_PREFETCH;	/* Size non-prefetch only. */
 	}
+	pbus_size_mem(bus, mask, type);
 }
 EXPORT_SYMBOL(pci_bus_size_bridges);
 
-void __devinit pci_bus_assign_resources(struct pci_bus *bus)
+void __devinit
+pci_bus_assign_resources(struct pci_bus *bus)
 {
 	struct pci_bus *b;
 	int found_vga = pbus_assign_resources_sorted(bus);
@@ -465,24 +351,9 @@
 	}
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		b = dev->subordinate;
-		if (!b)
-			continue;
-
-		pci_bus_assign_resources(b);
-
-		switch (dev->class >> 8) {
-		case PCI_CLASS_BRIDGE_PCI:
+		if (b) {
+			pci_bus_assign_resources(b);
 			pci_setup_bridge(b);
-			break;
-
-		case PCI_CLASS_BRIDGE_CARDBUS:
-			pci_setup_cardbus(b);
-			break;
-
-		default:
-			printk(KERN_INFO "PCI: not setting up bridge %s "
-			       "for bus %d\n", dev->slot_name, b->number);
-			break;
 		}
 	}
 }



-- 
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html

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Re: 2.5.64-mm7 - dies on smp with raid

[Helge Hafting]

mm7 crashed where mm2 works.
The machine is a dual celeron with two scsi disks with
some raid-1 & raid-0 partitions.

deadline or anicipatory scheduler does not make a difference.
It dies anyway, attempting to kill init.

Here's what I managed to  write down before the 30 second reboot
kicked in:

EIP is at md_wakeup_thread

stack:
do_md_run
autorun_array
autorun_devices
autostart_arrays
md_ioctl
dentry_open
kmem_cache_free
blkdev_ioctl
sys_ioctl
init
init

This happened during the boot process. The kernel is compiled
with gcc 2.95.4 from debian testing. The machine uses devfs

Helge Hafting

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Re: 2.5.64-mm7 - dies on smp with raid

[Andrew Morton]

Helge Hafting <helgehaf@aitel.hist.no> wrote:
>
> mm7 crashed where mm2 works.
> The machine is a dual celeron with two scsi disks with
> some raid-1 & raid-0 partitions.
> 
> deadline or anicipatory scheduler does not make a difference.
> It dies anyway, attempting to kill init.
> 
> Here's what I managed to  write down before the 30 second reboot
> kicked in:
> 
> EIP is at md_wakeup_thread
> 
> stack:
> do_md_run
> autorun_array
> autorun_devices
> autostart_arrays
> md_ioctl
> dentry_open
> kmem_cache_free
> blkdev_ioctl
> sys_ioctl
> init
> init
> 
> This happened during the boot process. The kernel is compiled
> with gcc 2.95.4 from debian testing. The machine uses devfs
> 

A lot of md updates went into Linus's tree overnight.  Can you get some more
details for Neil?

Here is a wild guess:

diff -puN drivers/md/md.c~a drivers/md/md.c
--- 25/drivers/md/md.c~a	2003-03-15 12:02:04.000000000 -0800
+++ 25-akpm/drivers/md/md.c	2003-03-15 12:02:14.000000000 -0800
@@ -2818,6 +2818,8 @@ int md_thread(void * arg)
 
 void md_wakeup_thread(mdk_thread_t *thread)
 {
+	if (!thread)
+		return;
 	dprintk("md: waking up MD thread %p.\n", thread);
 	set_bit(THREAD_WAKEUP, &thread->flags);
 	wake_up(&thread->wqueue);

_

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Re: 2.5.64-mm7 - dies on smp with raid

[Neil Brown]

On Saturday March 15, akpm@digeo.com wrote:
> 
> A lot of md updates went into Linus's tree overnight.  Can you get some more
> details for Neil?
> 
> Here is a wild guess:
> 
> diff -puN drivers/md/md.c~a drivers/md/md.c
> --- 25/drivers/md/md.c~a	2003-03-15 12:02:04.000000000 -0800
> +++ 25-akpm/drivers/md/md.c	2003-03-15 12:02:14.000000000 -0800
> @@ -2818,6 +2818,8 @@ int md_thread(void * arg)
>  
>  void md_wakeup_thread(mdk_thread_t *thread)
>  {
> +	if (!thread)
> +		return;
>  	dprintk("md: waking up MD thread %p.\n", thread);
>  	set_bit(THREAD_WAKEUP, &thread->flags);
>  	wake_up(&thread->wqueue);
> 

Looks like a good guess to me.

I hadn't considered raid0/linear properly in that last change suite.
They don't have a thread so there is nothing to wake up.

There are two places where the wrong thing will happen:
  do_md_run where it also calls md_update_sb which doesn't
    hurt but isn't really needed (there is never any point
    updating the superblock metadata for raid0/linear).
  restart_array where we switch back to read/write and wakeup
    the thread to see if there is anything to do.

We either need this "if(!thread)" test inside md_wakeup_thread
or at those two call sites, in which case we can avoid md_update_sb
as well.

I send one to Linus later...

Thanks,
NeilBrown
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