Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix potential deadloop in prepare_compress_overwrite()  Jan Prusakowski reported a kernel hang issue as below:  When running xfstests on linux-next kernel (6.14.0-rc3, 6.12) I encountered a problem in generic/475 test where fsstress process gets blocked in __f2fs_write_data_pages() and the test hangs. The options I used are:  MKFS_OPTIONS  -- -O compression -O extra_attr -O project_quota -O quota /dev/vdc MOUNT_OPTIONS -- -o acl,user_xattr -o discard,compress_extension=* /dev/vdc /vdc  INFO: task kworker/u8:0:11 blocked for more than 122 seconds.       Not tainted 6.14.0-rc3-xfstests-lockdep #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:0    state:D stack:0     pid:11    tgid:11    ppid:2      task_flags:0x4208160 flags:0x00004000 Workqueue: writeback wb_workfn (flush-253:0) Call Trace:  <TASK>  __schedule+0x309/0x8e0  schedule+0x3a/0x100  schedule_preempt_disabled+0x15/0x30  __mutex_lock+0x59a/0xdb0  __f2fs_write_data_pages+0x3ac/0x400  do_writepages+0xe8/0x290  __writeback_single_inode+0x5c/0x360  writeback_sb_inodes+0x22f/0x570  wb_writeback+0xb0/0x410  wb_do_writeback+0x47/0x2f0  wb_workfn+0x5a/0x1c0  process_one_work+0x223/0x5b0  worker_thread+0x1d5/0x3c0  kthread+0xfd/0x230  ret_from_fork+0x31/0x50  ret_from_fork_asm+0x1a/0x30  </TASK>  The root cause is: once generic/475 starts toload error table to dm device, f2fs_prepare_compress_overwrite() will loop reading compressed cluster pages due to IO error, meanwhile it has held .writepages lock, it can block all other writeback tasks.  Let's fix this issue w/ below changes: - add f2fs_handle_page_eio() in prepare_compress_overwrite() to detect IO error. - detect cp_error earler in f2fs_read_multi_pages().