Shutdown does not check the error of thaw_super due to readonly, which
causes a deadlock like below.
f2fs_ioc_shutdown(F2FS_GOING_DOWN_FULLSYNC) issue_discard_thread
- bdev_freeze
- freeze_super
- f2fs_stop_checkpoint()
- f2fs_handle_critical_error - sb_start_write
- set RO - waiting
- bdev_thaw
- thaw_super_locked
- return -EINVAL, if sb_rdonly()
- f2fs_stop_discard_thread
-> wait for kthread_stop(discard_thread);
Reported-by: "Light Hsieh (謝明燈)" <light.hs...@mediatek.com>
Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
fs/f2fs/super.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index df9765b41dac..ba6288e870c5 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -4135,9 +4135,16 @@ void f2fs_handle_critical_error(struct f2fs_sb_info
*sbi, unsigned char reason,
if (shutdown)
set_sbi_flag(sbi, SBI_IS_SHUTDOWN);
- /* continue filesystem operators if errors=continue */
- if (continue_fs || f2fs_readonly(sb))
+ /*
+ * Continue filesystem operators if errors=continue. Should not set
+ * RO by shutdown, since RO bypasses thaw_super which can hang the
+ * system.
+ */
+ if (continue_fs || f2fs_readonly(sb) ||
+ reason == STOP_CP_REASON_SHUTDOWN) {
+ f2fs_warn(sbi, "Stopped filesystem due to readon: %d", reason);
return;
+ }
f2fs_warn(sbi, "Remounting filesystem read-only");
/*
--
2.44.0.478.gd926399ef9-goog
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