TITLE: INFO: task hung in mpage_prepare_extent_to_map
ALT: hang in mpage_prepare_extent_to_map
TYPE: HANG

INFO: task syz-executor.0:10324 blocked for more than 122 seconds.
      Not tainted 5.10.2 #10
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:    0 pid:10324 ppid:  6326 flags:0x00000001
Backtrace: 
[<80c1e5e8>] (__schedule) from [<80c1eb20>] (schedule+0x60/0xdc)
[<80c1eb20>] (schedule) from [<80c1ec14>] (io_schedule+0x48/0x6c)
[<80c1ec14>] (io_schedule) from [<802893bc>] (wait_on_page_bit_common+0x1fc/0x59c)
[<802893bc>] (wait_on_page_bit_common) from [<8028986c>] (__lock_page+0x64/0x84)
[<8028986c>] (__lock_page) from [<8043e8d8>] (mpage_prepare_extent_to_map+0x3bc/0x4e4)
[<8043e8d8>] (mpage_prepare_extent_to_map) from [<80447148>] (ext4_writepages+0x42c/0x18ac)
[<80447148>] (ext4_writepages) from [<8029914c>] (do_writepages+0x54/0x12c)
[<8029914c>] (do_writepages) from [<8028a384>] (__filemap_fdatawrite_range+0xfc/0x130)
[<8028a384>] (__filemap_fdatawrite_range) from [<8028ac9c>] (file_write_and_wait_range+0x78/0xf8)
[<8028ac9c>] (file_write_and_wait_range) from [<8042d3e8>] (ext4_sync_file+0x208/0x5dc)
[<8042d3e8>] (ext4_sync_file) from [<80379258>] (vfs_fsync_range+0x64/0xc4)
[<80379258>] (vfs_fsync_range) from [<80429be0>] (ext4_buffered_write_iter+0x1e0/0x234)
[<80429be0>] (ext4_buffered_write_iter) from [<8042a4c0>] (ext4_file_write_iter+0x22c/0x118c)
[<8042a4c0>] (ext4_file_write_iter) from [<803223b4>] (do_iter_readv_writev+0x318/0x348)
[<803223b4>] (do_iter_readv_writev) from [<80323924>] (do_iter_write+0xe4/0x2d0)
[<80323924>] (do_iter_write) from [<80323b50>] (vfs_iter_write+0x40/0x58)
[<80323b50>] (vfs_iter_write) from [<80377328>] (iter_file_splice_write+0x3f4/0x5c8)
[<80377328>] (iter_file_splice_write) from [<803755b8>] (direct_splice_actor+0x50/0x78)
[<803755b8>] (direct_splice_actor) from [<80375b98>] (splice_direct_to_actor+0x188/0x3ec)
[<80375b98>] (splice_direct_to_actor) from [<80375edc>] (do_splice_direct+0xe0/0x148)
[<80375edc>] (do_splice_direct) from [<803241a4>] (do_sendfile+0x2d0/0x6e0)
[<803241a4>] (do_sendfile) from [<803263ac>] (sys_sendfile+0x16c/0x188)
[<803263ac>] (sys_sendfile) from [<80100080>] (ret_fast_syscall+0x0/0x54)
Exception stack(0x944e9fa8 to 0x944e9ff0)
9fa0:                   00000000 00000000 00000004 00000003 00000000 0000a198
9fc0: 00000000 00000000 00000000 000000bb 7efb3732 75e84160 75e83ca0 75e83c9c
9fe0: 75e83ae8 75e83ad8 000152e8 0004ed10
