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Subjectext4: kernel BUG at fs/ext4/inode.c:2959!
Hi all,

While fuzzing with trinity inside a KVM tools guest running the latest -next
kernel, I've stumbled on the following spew:

[ 409.233952] kernel BUG at fs/ext4/inode.c:2959!
[ 409.234761] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN
[ 409.237192] Dumping ftrace buffer:
[ 409.238424] (ftrace buffer empty)
[ 409.239664] Modules linked in:
[ 409.240706] CPU: 18 PID: 14016 Comm: trinity-c27 Not tainted 3.17.0-next-20141008-sasha-00051-g78b3c93-dirty #1364
[ 409.242724] task: ffff88032bb00000 ti: ffff8802e78f8000 task.ti: ffff8802e78f8000
[ 409.242724] RIP: ext4_direct_IO (fs/ext4/inode.c:2959 fs/ext4/inode.c:3098)
[ 409.242724] RSP: 0018:ffff8802e78fbb98 EFLAGS: 00010246
[ 409.242724] RAX: ffffda005cf1f7cf RBX: ffff88015f72f2f0 RCX: 0000000000000007
[ 409.242724] RDX: dfffe90000000000 RSI: 1ffff1002e58c5ef RDI: ffff8802e78fbe78
[ 409.242724] RBP: ffff8802e78fbc28 R08: dfffe90000000001 R09: ffff8802e78fbe5f
[ 409.242724] R10: 1ffff1005cf1f7cb R11: 0000000000000001 R12: ffff8802e78fbe60
[ 409.242724] R13: 000000000000000d R14: ffff8802e78fbc60 R15: ffff88015f72f2f0
[ 409.242724] FS: 0000000000798860(0063) GS:ffff880851c00000(0000) knlGS:0000000000000000
[ 409.242724] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 409.242724] CR2: 0000000002bd70f8 CR3: 000000032b542000 CR4: 00000000000006a0
[ 409.242724] Stack:
[ 409.242724] ffff88017380a1e8 0000000000000000 ffff8802e78fbbf8 ffffffff9937c5ff
[ 409.242724] ffff88015f72f318 7fffffffffffffff 0000000000000000 ffff8802e78fbe78
[ 409.242724] ffff88015f72f2f0 0000000000000000 000000000000000d 000000015f72f2f0
[ 409.242724] Call Trace:
[ 409.242724] ? __filemap_fdatawrite_range (mm/filemap.c:288)
[ 409.242724] generic_file_direct_write (mm/filemap.c:2413)
[ 409.242724] __generic_file_write_iter (mm/filemap.c:2595)
[ 409.242724] ext4_file_write_iter (fs/ext4/file.c:176)
[ 409.242724] ? get_parent_ip (kernel/sched/core.c:2606)
[ 409.242724] ? iov_iter_init (mm/iov_iter.c:442)
[ 409.242724] new_sync_write (fs/read_write.c:478)
[ 409.242724] vfs_write (fs/read_write.c:534)
[ 409.242724] SyS_pwrite64 (fs/read_write.c:627 fs/read_write.c:614)
[ 409.242724] tracesys_phase2 (arch/x86/kernel/entry_64.S:529)
[ 409.242724] Code: 00 00 65 8b 04 25 58 cb 00 00 a9 ff ff ff 7f 0f 85 94 fb ff ff e8 c1 cf ff ff f6 c4 02 0f 84 86 fb ff ff e9 5d fd ff ff 0f 1f 00 <0f> 0b e8 c9 4c c9 ff 84 c0 0f 84 85 fc ff ff 48 c7 c7 80 63 58
All code
========
0: 00 00 add %al,(%rax)
2: 65 8b 04 25 58 cb 00 mov %gs:0xcb58,%eax
9: 00
a: a9 ff ff ff 7f test $0x7fffffff,%eax
f: 0f 85 94 fb ff ff jne 0xfffffffffffffba9
15: e8 c1 cf ff ff callq 0xffffffffffffcfdb
1a: f6 c4 02 test $0x2,%ah
1d: 0f 84 86 fb ff ff je 0xfffffffffffffba9
23: e9 5d fd ff ff jmpq 0xfffffffffffffd85
28: 0f 1f 00 nopl (%rax)
2b:* 0f 0b ud2 <-- trapping instruction
2d: e8 c9 4c c9 ff callq 0xffffffffffc94cfb
32: 84 c0 test %al,%al
34: 0f 84 85 fc ff ff je 0xfffffffffffffcbf
3a: 48 c7 c7 80 63 58 00 mov $0x586380,%rdi

Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: e8 c9 4c c9 ff callq 0xffffffffffc94cd0
7: 84 c0 test %al,%al
9: 0f 84 85 fc ff ff je 0xfffffffffffffc94
f: 48 c7 c7 80 63 58 00 mov $0x586380,%rdi
[ 409.242724] RIP ext4_direct_IO (fs/ext4/inode.c:2959 fs/ext4/inode.c:3098)
[ 409.242724] RSP <ffff8802e78fbb98>

Thanks,
Sasha


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