Hi all,
While fuzzing with trinity inside a KVM tools guest, running latest -next kernel, I've
stumbled on the following:
[ 998.281867] BUG: unable to handle kernel NULL pointer dereference at 0000000000000274
[ 998.283333] IP: [<ffffffff812707c4>] region_truncate+0x64/0xd0
[ 998.284288] PGD 0
[ 998.284717] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 998.286506] Modules linked in:
[ 998.287101] CPU: 88 PID: 24650 Comm: trinity-child85 Tainted: G B W
3.11.0-next-20130906-sasha #3985
[ 998.288844] task: ffff8800c1110000 ti: ffff8800c544a000 task.ti: ffff8800c544a000
[ 998.290257] RIP: 0010:[<ffffffff812707c4>] [<ffffffff812707c4>] region_truncate+0x64/0xd0
[ 998.290301] RSP: 0018:ffff8800c544ba58 EFLAGS: 00010293
[ 998.290301] RAX: 0000000000000274 RBX: ffff880f47d3b0f8 RCX: 000000003fd075fc
[ 998.290301] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff880f47d3b0f8
[ 998.290301] RBP: ffff8800c544ba78 R08: 0000000000000000 R09: 0000000000000000
[ 998.290301] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 998.290301] R13: ffffffff8741bc60 R14: 0000000000000000 R15: ffff880e9d8b5590
[ 998.290301] FS: 00007f47f28c2700(0000) GS:ffff880fe2200000(0000) knlGS:0000000000000000
[ 998.290301] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 998.290301] CR2: 0000000000000274 CR3: 0000000005a23000 CR4: 00000000000006e0
[ 998.290301] Stack:
[ 998.290301] ffff880f47d3ad50 0000000000000000 ffffffff8741bc60 0000000000000000
[ 998.290301] ffff8800c544bac8 ffffffff81274856 0000000000000000 ffff8800c544bb18
[ 998.290301] 0000000000000000 0000000000000000 0000000000000000 ffff8800c544bb18
[ 998.290301] Call Trace:
[ 998.290301] [<ffffffff81274856>] hugetlb_unreserve_pages+0x46/0xd0
[ 998.290301] [<ffffffff8142abe2>] truncate_hugepages+0x202/0x220
[ 998.290301] [<ffffffff812d2ec8>] ? inode_wait_for_writeback+0x28/0x50
[ 998.290301] [<ffffffff81150fe7>] ? bit_waitqueue+0x17/0xc0
[ 998.290301] [<ffffffff812d2ed8>] ? inode_wait_for_writeback+0x38/0x50
[ 998.290301] [<ffffffff8142ac18>] hugetlbfs_evict_inode+0x18/0x30
[ 998.290301] [<ffffffff812c4001>] evict+0xc1/0x1a0
[ 998.290301] [<ffffffff812c4243>] iput_final+0x163/0x180
[ 998.290301] [<ffffffff812c42af>] iput+0x4f/0x60
[ 998.290301] [<ffffffff812bf5a8>] dentry_iput+0xc8/0xf0
[ 998.290301] [<ffffffff812c200a>] dput+0x17a/0x1a0
[ 998.290301] [<ffffffff812a9ea7>] __fput+0x2b7/0x2d0
[ 998.290301] [<ffffffff812a9f8e>] ____fput+0xe/0x10
[ 998.290301] [<ffffffff81149b4e>] task_work_run+0xae/0xf0
[ 998.290301] [<ffffffff81127c09>] do_exit+0x2d9/0x4d0
[ 998.290301] [<ffffffff81127ea9>] do_group_exit+0xa9/0xe0
[ 998.290301] [<ffffffff8113c185>] get_signal_to_deliver+0x475/0x4d0
[ 998.290301] [<ffffffff81067c2b>] do_signal+0x4b/0x120
[ 998.290301] [<ffffffff8114ba24>] ? __rcu_read_unlock+0x44/0x80
[ 998.290301] [<ffffffff8116911c>] ? vtime_account_user+0x5c/0x70
[ 998.290301] [<ffffffff81222215>] ? context_tracking_user_exit+0x145/0x150
[ 998.290301] [<ffffffff81067f8a>] do_notify_resume+0x5a/0xe0
[ 998.290301] [<ffffffff841129a0>] int_signal+0x12/0x17
[ 998.290301] Code: 0e 48 8b 00 48 39 d8 75 ee eb 6c 0f 1f 40 00 45 31 f6 48 3b 70 10 90 7e 0e 4c
8b 70 18 48 89 70 18 49 29 f6 48 8b 00 48 8b 40 08 <4c> 8b 28 4d 8b 65 00 4c 89 ef 4d 3b 6d 08 74 44
4c 39 eb 75 12
[ 998.290301] RIP [<ffffffff812707c4>] region_truncate+0x64/0xd0
[ 998.290301] RSP <ffff8800c544ba58>
[ 998.290301] CR2: 0000000000000274
Thanks,
Sasha
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