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Andreas Herrmann writes:
When I've used slub_debug kernel option (e.g.
"slub_debug=,skbuff_fclone_cache" or similar) on a debug session I've
seen a panic like:
Highbank #setenv bootargs console=ttyAMA0 root=/dev/sda2 kgdboc.kgdboc=ttyAMA0,115200 slub_debug=,kmalloc-4096 earlyprintk=ttyAMA0
...
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0004000
[00000000] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Tainted: G W 3.12.0-00048-gbe408cd #314
task: c0898360 ti: c088a000 task.ti: c088a000
PC is at strncmp+0x1c/0x84
LR is at kmem_cache_flags.isra.46.part.47+0x44/0x60
pc : [<c02c6da0>] lr : [<c0110a3c>] psr: 200001d3
sp : c088bea8 ip : c088beb8 fp : c088beb4
r10: 00000000 r9 : 413fc090 r8 : 00000001
r7 : 00000000 r6 : c2984a08 r5 : c0966e78 r4 : 00000000
r3 : 0000006b r2 : 0000000c r1 : 00000000 r0 : c2984a08
Flags: nzCv IRQs off FIQs off Mode SVC_32 ISA ARM Segment kernel
Control: 10c5387d Table: 0000404a DAC: 00000015
Process swapper (pid: 0, stack limit = 0xc088a248)
Stack: (0xc088bea8 to 0xc088c000)
bea0: c088bed4 c088beb8 c0110a3c c02c6d90 c0966e78 00000040
bec0: ef001f00 00000040 c088bf14 c088bed8 c0112070 c0110a04 00000005 c010fac8
bee0: c088bf5c c088bef0 c010fac8 ef001f00 00000040 00000000 00000040 00000001
bf00: 413fc090 00000000 c088bf34 c088bf18 c0839190 c0112040 00000000 ef001f00
bf20: 00000000 00000000 c088bf54 c088bf38 c0839200 c083914c 00000006 c0961c4c
bf40: c0961c28 00000000 c088bf7c c088bf58 c08392ac c08391c0 c08a2ed8 c0966e78
bf60: c086b874 c08a3f50 c0961c28 00000001 c088bfb4 c088bf80 c083b258 c0839248
bf80: 2f800000 0f000000 c08935b4 ffffffff c08cd400 ffffffff c08cd400 c0868408
bfa0: c29849c0 00000000 c088bff4 c088bfb8 c0824974 c083b1e4 ffffffff ffffffff
bfc0: c08245c0 00000000 00000000 c0868408 00000000 10c5387d c0892bcc c0868404
bfe0: c0899440 0000406a 00000000 c088bff8 00008074 c0824824 00000000 00000000
[<c02c6da0>] (strncmp+0x1c/0x84) from [<c0110a3c>] (kmem_cache_flags.isra.46.part.47+0x44/0x60)
[<c0110a3c>] (kmem_cache_flags.isra.46.part.47+0x44/0x60) from [<c0112070>] (__kmem_cache_create+0x3c/0x410)
[<c0112070>] (__kmem_cache_create+0x3c/0x410) from [<c0839190>] (create_boot_cache+0x50/0x74)
[<c0839190>] (create_boot_cache+0x50/0x74) from [<c0839200>] (create_kmalloc_cache+0x4c/0x88)
[<c0839200>] (create_kmalloc_cache+0x4c/0x88) from [<c08392ac>] (create_kmalloc_caches+0x70/0x114)
[<c08392ac>] (create_kmalloc_caches+0x70/0x114) from [<c083b258>] (kmem_cache_init+0x80/0xe0)
[<c083b258>] (kmem_cache_init+0x80/0xe0) from [<c0824974>] (start_kernel+0x15c/0x318)
[<c0824974>] (start_kernel+0x15c/0x318) from [<00008074>] (0x8074)
Code: e3520000 01a00002 089da800 e5d03000 (e5d1c000)
---[ end trace 1b75b31a2719ed1d ]---
Kernel panic - not syncing: Fatal exception
Problem is that slub_debug option is not parsed before
create_boot_cache is called. Solve this by changing slub_debug to
early_param.
Kernels 3.11, 3.10 are also affected. I am not sure about older
kernels.
Christoph Lameter explains:
kmem_cache_flags may be called with NULL parameter during early boot.
Skip the test in that case.
Cc: stable@vger.kernel.org # 3.10 and 3.11
Reported-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
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||
|---|---|---|
| .. | ||
| backing-dev.c | ||
| balloon_compaction.c | ||
| bootmem.c | ||
| bounce.c | ||
| cleancache.c | ||
| compaction.c | ||
| debug-pagealloc.c | ||
| dmapool.c | ||
| fadvise.c | ||
| failslab.c | ||
| filemap.c | ||
| filemap_xip.c | ||
| fremap.c | ||
| frontswap.c | ||
| highmem.c | ||
| huge_memory.c | ||
| hugetlb.c | ||
| hugetlb_cgroup.c | ||
| hwpoison-inject.c | ||
| init-mm.c | ||
| internal.h | ||
| interval_tree.c | ||
| Kconfig | ||
| Kconfig.debug | ||
| kmemcheck.c | ||
| kmemleak-test.c | ||
| kmemleak.c | ||
| ksm.c | ||
| maccess.c | ||
| madvise.c | ||
| Makefile | ||
| memblock.c | ||
| memcontrol.c | ||
| memory-failure.c | ||
| memory.c | ||
| memory_hotplug.c | ||
| mempolicy.c | ||
| mempool.c | ||
| migrate.c | ||
| mincore.c | ||
| mlock.c | ||
| mm_init.c | ||
| mmap.c | ||
| mmu_context.c | ||
| mmu_notifier.c | ||
| mmzone.c | ||
| mprotect.c | ||
| mremap.c | ||
| msync.c | ||
| nobootmem.c | ||
| nommu.c | ||
| oom_kill.c | ||
| page-writeback.c | ||
| page_alloc.c | ||
| page_cgroup.c | ||
| page_io.c | ||
| page_isolation.c | ||
| pagewalk.c | ||
| percpu-km.c | ||
| percpu-vm.c | ||
| percpu.c | ||
| pgtable-generic.c | ||
| process_vm_access.c | ||
| quicklist.c | ||
| readahead.c | ||
| rmap.c | ||
| shmem.c | ||
| slab.c | ||
| slab.h | ||
| slab_common.c | ||
| slob.c | ||
| slub.c | ||
| sparse-vmemmap.c | ||
| sparse.c | ||
| swap.c | ||
| swap_state.c | ||
| swapfile.c | ||
| truncate.c | ||
| util.c | ||
| vmalloc.c | ||
| vmpressure.c | ||
| vmscan.c | ||
| vmstat.c | ||
| zbud.c | ||
| zswap.c | ||