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    SubjectRegression 2.6.33->2.6.34: OOPS at boot, kmalloc corruption?
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    Trying to upgrade my system from 2.6.33 to 2.6.34, I can't get it to boot.

    All tries used CONFIG_SLUB=y

    The gentoo version of 2.6.34 generated an OOPS during network
    initialization and then came to a stop. (It seemed that all processes
    got stuck waiting on some locks.)
    As in this instance the system was able to start the syslog, I was
    able to capture the complete OOPS:
    Jul 3 05:51:43 ariolc kernel: [ 32.674367] BUG: unable to handle
    kernel NULL pointer dereference at 0000000000000003
    Jul 3 05:51:43 ariolc kernel: [ 32.675674] IP: [<ffffffff810aab89>]
    __kmalloc_track_caller+0x69/0x110
    Jul 3 05:51:43 ariolc kernel: [ 32.676951] PGD 11e7e5067 PUD 11fd3d067 PMD 0
    Jul 3 05:51:43 ariolc kernel: [ 32.678224] Oops: 0000 [#1] SMP
    Jul 3 05:51:43 ariolc kernel: [ 32.679477] last sysfs file:
    /sys/devices/virtual/block/md0/md/metadata_version
    Jul 3 05:51:43 ariolc kernel: [ 32.680745] CPU 1
    Jul 3 05:51:43 ariolc kernel: [ 32.680761] Modules linked in:
    aes_x86_64(+) aes_generic sg
    Jul 3 05:51:43 ariolc kernel: [ 32.682764]
    Jul 3 05:51:43 ariolc kernel: [ 32.682764] Pid: 4652, comm:
    modprobe Not tainted 2.6.34-gentoo-r1 #1 MS-7368/MS-7368
    Jul 3 05:51:43 ariolc kernel: [ 32.682764] RIP:
    0010:[<ffffffff810aab89>] [<ffffffff810aab89>]
    __kmalloc_track_caller+0x69/0x110
    Jul 3 05:51:43 ariolc kernel: [ 32.682764] RSP:
    0018:ffff88011e75fe08 EFLAGS: 00010006
    Jul 3 05:51:43 ariolc kernel: [ 32.687268] RAX: ffff880001b0f088
    RBX: ffffffff8170d4d0 RCX: ffff88011e574b80
    Jul 3 05:51:43 ariolc kernel: [ 32.688564] RDX: 0000000000000000
    RSI: 00000000000000d0 RDI: 00000000000002d0
    Jul 3 05:51:43 ariolc kernel: [ 32.688564] RBP: 0000000000000296
    R08: 0000000000000014 R09: ffff88011e574800
    Jul 3 05:51:43 ariolc kernel: [ 32.691414] R10: 0000000000000001
    R11: ffff880001a12008 R12: 00000000000000d0
    Jul 3 05:51:43 ariolc kernel: [ 32.691414] R13: 0000000000000003
    R14: ffffffff81064abb R15: ffffc90010729d68
    Jul 3 05:51:43 ariolc kernel: [ 32.691414] FS:
    00007f0a9acb8700(0000) GS:ffff880001b00000(0000)
    knlGS:0000000000000000
    Jul 3 05:51:43 ariolc kernel: [ 32.691414] CS: 0010 DS: 0000 ES:
    0000 CR0: 0000000080050033
    Jul 3 05:51:43 ariolc kernel: [ 32.697212] CR2: 0000000000000003
    CR3: 000000011d03e000 CR4: 00000000000006e0
    Jul 3 05:51:43 ariolc kernel: [ 32.698792] DR0: 0000000000000000
    DR1: 0000000000000000 DR2: 0000000000000000
    Jul 3 05:51:43 ariolc kernel: [ 32.698792] DR3: 0000000000000000
    DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Jul 3 05:51:43 ariolc kernel: [ 32.698792] Process modprobe (pid:
    4652, threadinfo ffff88011e75e000, task ffff88011d114150)
    Jul 3 05:51:43 ariolc kernel: [ 32.698792] Stack:
    Jul 3 05:51:43 ariolc kernel: [ 32.698792] 0000000000000000
    ffffc90010729c97 0000000000000008 ffff88011e574800
    Jul 3 05:51:43 ariolc kernel: [ 32.698792] <0> ffff88011e574aa0
    ffffffff8108c27b ffffffffa0018920 ffffc900000000d0
    Jul 3 05:51:43 ariolc kernel: [ 32.698792] <0> ffffffffa0018920
    ffffc90010728000 ffffc90010729d68 ffffffff81064abb
    Jul 3 05:51:43 ariolc kernel: [ 32.708636] Call Trace:
    Jul 3 05:51:43 ariolc kernel: [ 32.708636] [<ffffffff8108c27b>] ?
    kstrdup+0x3b/0x70
    Jul 3 05:51:43 ariolc kernel: [ 32.711488] [<ffffffff81064abb>] ?
    load_module+0x13eb/0x1730
    Jul 3 05:51:43 ariolc kernel: [ 32.711488] [<ffffffff81064e7b>] ?
    sys_init_module+0x7b/0x260
    Jul 3 05:51:43 ariolc kernel: [ 32.711488] [<ffffffff810024ab>] ?
    system_call_fastpath+0x16/0x1b
    Jul 3 05:51:43 ariolc kernel: [ 32.716465] Code: 23 25 dc 47 6f 00
    41 f6 c4 10 75 66 9c 5d fa 65 48 8b 14 25 a8 d1 00 00 48 8b 03 48 8d
    04 02 4c 8b 28 4d 85 ed 74 55 48 63 53 18 <49> 8b 54 15 00 48 89 10 55
    9d 4d 85 ed 74 06 66 45 85 e4 78 22
    Jul 3 05:51:43 ariolc kernel: [ 32.718865] RIP
    [<ffffffff810aab89>] __kmalloc_track_caller+0x69/0x110
    Jul 3 05:51:43 ariolc kernel: [ 32.718865] RSP <ffff88011e75fe08>
    Jul 3 05:51:43 ariolc kernel: [ 32.718865] CR2: 0000000000000003
    Jul 3 05:51:43 ariolc kernel: [ 32.718865] ---[ end trace
    692101747f991cfb ]---

    Two other OOPSen in __kmalloc() followed this one.

    I tried to switch from CONFIG_NO_BOOTMEM=y to unsetting this option.
    This kernel froze before the userspace was started, I did not see any
    OOPS output.

    Today I tried the vanilla 2.6.34.1 (again with CONFIG_NO_BOOTMEM=y).
    The vanilla kernel also crashed before userspace, again in
    __kmalloc(), but with a visible OOPS.
    I wrote the following informations down:
    OPPS was: BUG: unable to handle kernel NULL pointer dereference at
    0000000000000003
    Callchain started with:
    ffffffff810aab39 : __kmalloc_track_caller+0x69/0x110
    ffffffff8108c23b : kstrdup+0x3b/0x70
    called from sysfs_new_dirent
    there where no modules loaded at this time, the faulting process was
    Pid: 1, comm: swapper

    From System.map:
    ffffffff810aa910 t get_slab
    ffffffff810aa980 T __kmalloc_node_track_caller
    ffffffff810aaad0 T __kmalloc_track_caller
    ffffffff810aabe0 T __kmalloc
    Dump of assembler code from 0xffffffff810aaad0 to 0xffffffff810aabe0:
    0xffffffff810aaad0: sub $0x28,%rsp
    0xffffffff810aaad4: cmp $0x2000,%rdi
    0xffffffff810aaadb: mov %r12,0x10(%rsp)
    0xffffffff810aaae0: mov %r14,0x20(%rsp)
    0xffffffff810aaae5: mov %esi,%r12d
    0xffffffff810aaae8: mov %rbx,(%rsp)
    0xffffffff810aaaec: mov %rbp,0x8(%rsp)
    0xffffffff810aaaf1: mov %rdx,%r14
    0xffffffff810aaaf4: mov %r13,0x18(%rsp)
    0xffffffff810aaaf9: ja 0xffffffff810aaba3
    0xffffffff810aaaff: callq 0xffffffff810aa910
    0xffffffff810aab04: cmp $0x10,%rax
    0xffffffff810aab08: mov %rax,%rbx
    0xffffffff810aab0b: jbe 0xffffffff810aab51
    0xffffffff810aab0d: and 0x6f48ac(%rip),%r12d # 0xffffffff8179f3c0
    0xffffffff810aab14: test $0x10,%r12b
    0xffffffff810aab18: jne 0xffffffff810aab80
    0xffffffff810aab1a: pushfq
    0xffffffff810aab1b: pop %rbp
    0xffffffff810aab1c: cli
    0xffffffff810aab1d: mov %gs:0xd1a8,%rdx
    0xffffffff810aab26: mov (%rbx),%rax
    0xffffffff810aab29: lea (%rdx,%rax,1),%rax
    0xffffffff810aab2d: mov (%rax),%r13
    0xffffffff810aab30: test %r13,%r13
    0xffffffff810aab33: je 0xffffffff810aab8a
    0xffffffff810aab35: movslq 0x18(%rbx),%rdx
    0xffffffff810aab39: mov 0x0(%r13,%rdx,1),%rdx
    0xffffffff810aab3e: mov %rdx,(%rax)
    0xffffffff810aab41: push %rbp
    0xffffffff810aab42: popfq
    0xffffffff810aab43: test %r13,%r13
    0xffffffff810aab46: je 0xffffffff810aab4e
    0xffffffff810aab48: test %r12w,%r12w
    0xffffffff810aab4c: js 0xffffffff810aab70
    0xffffffff810aab4e: mov %r13,%rax
    0xffffffff810aab51: mov (%rsp),%rbx
    0xffffffff810aab55: mov 0x8(%rsp),%rbp
    0xffffffff810aab5a: mov 0x10(%rsp),%r12
    0xffffffff810aab5f: mov 0x18(%rsp),%r13
    0xffffffff810aab64: mov 0x20(%rsp),%r14
    0xffffffff810aab69: add $0x28,%rsp
    0xffffffff810aab6d: retq
    0xffffffff810aab6e: xchg %ax,%ax
    0xffffffff810aab70: movslq 0x14(%rbx),%rdx
    0xffffffff810aab74: xor %esi,%esi
    0xffffffff810aab76: mov %r13,%rdi
    0xffffffff810aab79: callq 0xffffffff811f51e0
    0xffffffff810aab7e: jmp 0xffffffff810aab4e
    0xffffffff810aab80: callq 0xffffffff814cd640
    0xffffffff810aab85: nopl (%rax)
    0xffffffff810aab88: jmp 0xffffffff810aab1a
    0xffffffff810aab8a: mov %rax,%r8
    0xffffffff810aab8d: mov %r14,%rcx
    0xffffffff810aab90: or $0xffffffffffffffff,%edx
    0xffffffff810aab93: mov %r12d,%esi
    0xffffffff810aab96: mov %rbx,%rdi
    0xffffffff810aab99: callq 0xffffffff810a9ae0
    0xffffffff810aab9e: mov %rax,%r13
    0xffffffff810aaba1: jmp 0xffffffff810aab41
    0xffffffff810aaba3: dec %rdi
    0xffffffff810aaba6: or $0xffffffffffffffff,%esi
    0xffffffff810aaba9: shr $0xb,%rdi
    0xffffffff810aabad: inc %esi
    0xffffffff810aabaf: shr %rdi
    0xffffffff810aabb2: jne 0xffffffff810aabad
    0xffffffff810aabb4: mov %r12d,%edi
    0xffffffff810aabb7: mov (%rsp),%rbx
    0xffffffff810aabbb: mov 0x8(%rsp),%rbp
    0xffffffff810aabc0: mov 0x10(%rsp),%r12
    0xffffffff810aabc5: mov 0x18(%rsp),%r13
    0xffffffff810aabca: or $0x4000,%edi
    0xffffffff810aabd0: mov 0x20(%rsp),%r14
    0xffffffff810aabd5: add $0x28,%rsp
    0xffffffff810aabd9: jmpq 0xffffffff81080920
    0xffffffff810aabde: xchg %ax,%ax

    From this assembly, I would guess its this line in slub.c / slab_alloc():
    c->freelist = get_freepointer(s, object);

    A short test with 2.6.35-rc4 suggest that this problem has been fixed
    on master, although 2.6.35-rc4 only boots with radeon.modset=0. With
    KMS enabled the display turns off and the system does not even respond
    to SysRq+B.
    (I will report this KMS issue in another mail.)

    The system is an AMD RS690 with an Athlon X2 BE-2400.
    Under 2.6.33 the system is perfectly stable, KMS is working and enabled.

    Any guesses what this might cause?

    Thanks for looking that this,
    Torsten


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