I have actually met a NULL pointer dereference at init_waitqueue_head, and bisected to 33f46f26c6fe6e06f808c160e33106bc97e45914.
commit 33f46f26c6fe6e06f808c160e33106bc97e45914
Author: james toy <toyj@xxxxxxxxx>
Date: Tue Nov 23 23:19:22 2010 +0100
GIT c239aa98a4d58c79abbd975e846a4f2497b6a942 git+ssh://master.kernel.org/pub/scm/linux/kernel/git/sfr/linux-next.git
However, I could not find a way to bisect further in mmtom as this was a giant huge single commit there. I have also tried to test the latest linux-next and use that commit as the HEAD, and there were no such problem. It looks like some integration problem only reproducible with mmtom and linux-tree trees merged.
[ 3.994848] BUG: unable to handle kernel NULL pointer dereference at 0000000000000330
[ 3.995824] IP: [<ffffffff81069bdd>] __init_waitqueue_head+0xd/0x1d
[ 3.995824] PGD 0
[ 3.995824] Oops: 0002 [#1] SMP
[ 3.995824] last sysfs file:
[ 3.995824] CPU 3
[ 3.995824] Modules linked in:
[ 3.995824]
[ 3.995824] Pid: 1, comm: swapper Not tainted 2.6.37-rc3-next-20101123+ #35 0M860N/OptiPlex 760
[ 3.995824] RIP: 0010:[<ffffffff81069bdd>] [<ffffffff81069bdd>] __init_waitqueue_head+0xd/0x1d
[ 4.068250] RSP: 0018:ffff88022b4e1e60 EFLAGS: 00010246
[ 4.068250] RAX: 0000000000000338 RBX: 0000000000000000 RCX: 0000000000003973
[ 4.068250] RDX: ffff88022b753f60 RSI: ffffffff81d9c8b0 RDI: 0000000000000330
[ 4.068250] RBP: ffff88022b4e1e60 R08: 0000000000000100 R09: ffff88022b71a3a8
[ 4.068250] R10: ffff88022b753e10 R11: 0000000000000000 R12: 0000000000000000
[ 4.068250] R13: 0000000000000000 R14: 0000000000000100 R15: 0000000000000000
[ 4.068250] FS: 0000000000000000(0000) GS:ffff8800bfac0000(0000) knlGS:0000000000000000
[ 4.068250] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 4.068250] CR2: 0000000000000330 CR3: 0000000001a03000 CR4: 00000000000406e0
[ 4.068250] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4.068250] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 4.068250] Process swapper (pid: 1, threadinfo ffff88022b4e0000, task ffff88022b4d8000)
[ 4.068250] Stack:
[ 4.068250] ffff88022b4e1ea0 ffffffff81b8f002 0000000000000000 ffffffff81c1b3d0
[ 4.068250] ffffffff81b8ef96 0000000000000000 0000000000000100 0000000000000000
[ 4.068250] ffff88022b4e1ed0 ffffffff8100219b ffffffff81c1b3d0 ffffffff81b356a0
[ 4.068250] Call Trace:
[ 4.068250] [<ffffffff81b8f002>] sep_init+0x6c/0x3a5
[ 4.068250] [<ffffffff81b8ef96>] ? sep_init+0x0/0x3a5
[ 4.068250] [<ffffffff8100219b>] do_one_initcall+0x7f/0x138
[ 4.068250] [<ffffffff81b53db9>] kernel_init+0x17d/0x20b
[ 4.068250] [<ffffffff8100aa64>] kernel_thread_helper+0x4/0x10
[ 4.068250] [<ffffffff81b53c3c>] ? kernel_init+0x0/0x20b
[ 4.068250] [<ffffffff8100aa60>] ? kernel_thread_helper+0x0/0x10
[ 4.068250] Code: 8b 2d e8 fa 9a 00 49 81 fd a0 96 a1 81 75 96 66 ff 05 28 f0 c2 00 e9 58 ff ff ff 90 90 90 55 48 89 e5 0f 1f 44 00 00 48 8d 47 08 <c7> 0
[ 4.068250] RIP [<ffffffff81069bdd>] __init_waitqueue_head+0xd/0x1d
[ 4.068250] RSP <ffff88022b4e1e60>
[ 4.068250] CR2: 0000000000000330
[ 4.272399] ---[ end trace 6233ae78c1aa3f59 ]---
[ 4.277115] Kernel panic - not syncing: Attempted to kill init!
[ 4.283124] Pid: 1, comm: swapper Tainted: G D 2.6.37-rc3-next-20101123+ #35
[ 4.291113] Call Trace:
[ 4.372943] [<ffffffff81461637>] panic+0x91/0x19f
[ 4.382552] [<ffffffff810ce579>] ? perf_event_exit_task+0xb8/0x1c7
[ 4.435526] [<ffffffff81052407>] do_exit+0x7a/0x70a
[ 4.440582] [<ffffffff814635bf>] ? _raw_spin_unlock_irqrestore+0x17/0x19
[ 4.447455] [<ffffffff810505a7>] ? kmsg_dump+0x123/0x140
[ 4.452942] [<ffffffff8146496c>] oops_end+0xbf/0xc7
[ 4.458021] [<ffffffff81033288>] no_context+0x1f9/0x208
[ 4.463422] [<ffffffff81033429>] __bad_area_nosemaphore+0x192/0x1b5
[ 4.469861] [<ffffffff8103345f>] bad_area_nosemaphore+0x13/0x15
[ 4.475956] [<ffffffff81466b3b>] do_page_fault+0x187/0x35a
[ 4.481631] [<ffffffff8121b091>] ? ida_get_new_above+0xf9/0x19e
[ 4.487728] [<ffffffff8103dab8>] ? should_resched+0xe/0x2e
[ 4.500350] [<ffffffff8110ae6e>] ? kmem_cache_alloc+0x73/0xe3
[ 4.506275] [<ffffffff81170370>] ? sysfs_find_dirent+0x3f/0x58
[ 4.512287] [<ffffffff81170269>] ? sysfs_addrm_finish+0x2f/0xb9
[ 4.518380] [<ffffffff81463dd5>] page_fault+0x25/0x30
[ 4.523607] [<ffffffff81069bdd>] ? __init_waitqueue_head+0xd/0x1d
[ 4.529875] [<ffffffff81b8f002>] sep_init+0x6c/0x3a5
[ 4.535022] [<ffffffff81b8ef96>] ? sep_init+0x0/0x3a5
[ 4.540250] [<ffffffff8100219b>] do_one_initcall+0x7f/0x138
[ 4.545997] [<ffffffff81b53db9>] kernel_init+0x17d/0x20b
[ 4.551498] [<ffffffff8100aa64>] kernel_thread_helper+0x4/0x10
[ 4.557505] [<ffffffff81b53c3c>] ? kernel_init+0x0/0x20b
[ 4.564887] [<ffffffff8100aa60>] ? kernel_thread_helper+0x0/0x10
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