On Tue, Apr 23, 2019 at 09:30:22AM -0700, Zubin Mithra wrote:
> Hello,
>
> Syzkaller has triggered a kernel WARNING with the following stacktrace when fuzzing a 4.14 kernel.
>
> Call Trace:
> __dump_stack lib/dump_stack.c:17 [inline]
> dump_stack+0xb7/0x107 lib/dump_stack.c:53
> panic+0x1c9/0x3ae kernel/panic.c:181
> __warn+0x160/0x1a8 kernel/panic.c:543
> report_bug+0x123/0x18b lib/bug.c:186
> fixup_bug+0x3e/0x77 arch/x86/kernel/traps.c:177
> do_error_trap+0xdd/0x1e6 arch/x86/kernel/traps.c:295
> invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:944
> do_blockdev_direct_IO+0x1b08/0x1b95 fs/direct-io.c:1373
> ext4_direct_IO_write fs/ext4/inode.c:3696 [inline]
> ext4_direct_IO+0x8de/0xdad fs/ext4/inode.c:3826
> generic_file_direct_write+0x223/0x36b mm/filemap.c:2927
> __generic_file_write_iter+0x12f/0x2f8 mm/filemap.c:3106
> ext4_file_write_iter+0x97d/0xade fs/ext4/file.c:264
> call_write_iter include/linux/fs.h:1782 [inline]
> do_iter_readv_writev+0x1e4/0x27c fs/read_write.c:678
> do_iter_write+0x136/0x18f fs/read_write.c:957
> vfs_iter_write+0x81/0x98 fs/read_write.c:970
> iter_file_splice_write+0x4dc/0x7a6 fs/splice.c:749
> do_splice_from fs/splice.c:851 [inline]
> direct_splice_actor+0x11e/0x129 fs/splice.c:1018
> splice_direct_to_actor+0x342/0x5b0 fs/splice.c:973
> do_splice_direct+0x180/0x1ff fs/splice.c:1061
> do_sendfile+0x3e6/0x61c fs/read_write.c:1438
> SYSC_sendfile64 fs/read_write.c:1499 [inline]
> SyS_sendfile64+0xe9/0x128 fs/read_write.c:1485
> do_syscall_64+0x203/0x241 arch/x86/entry/common.c:290
> entry_SYSCALL_64_after_hwframe+0x42/0xb7
>
> Could the following patch be applied in order to v4.14.y(The patch is present in v4.19.y)?
> 5a9d929d6e13 ("iomap: report collisions between directio and buffered writes to userspace")
Now queued up, thanks.
greg k-h
