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charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260311-origin-dev-v1-1-40524ef07ff0@amlogic.com> X-B4-Tracking: v=1; b=H4sIADkYsWkC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDIzMDY0ND3fyizPTMPN2U1DJdw2RLMzNTc0sLIwMTJaCGgqLUtMwKsGHRsbW 1AF5jXR5cAAAA X-Change-ID: 20260311-origin-dev-1c9665798204 To: Gao Xiang , Chao Yu , Yue Hu , Jeffle Xu , Sandeep Dhavale , Hongbo Li , Chunhai Guo Cc: linux-erofs@lists.ozlabs.org, linux-kernel@vger.kernel.org, jianxin.pan@amlogic.com, tuan.zhang@amlogic.com, Jiucheng Xu X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1773213766; l=1783; i=jiucheng.xu@amlogic.com; s=20250821; h=from:subject:message-id; bh=M0DxC1YSsNeUXU4lWpQgPmCwcDRu1aw6juBcKAOFoVM=; b=ugKwv1rm6H2qLye79IJSJ4l//Zmqe9nzUqXC6/9IrEJa+VRQ1DSlVFZTgzZXXk8PfbtMAiR1X pJ2N00kgkSRCJW4cJ4EGDTq+vIS5vsU2wTZkgsUJGoXqxxYaw/ekjFY X-Developer-Key: i=jiucheng.xu@amlogic.com; a=ed25519; pk=Q18IjkdWCCuncSplyu+dYqIrm+n42glvoLFJTQqpb2o= X-Endpoint-Received: by B4 Relay for jiucheng.xu@amlogic.com/20250821 with auth_id=498 X-Original-From: Jiucheng Xu Reply-To: jiucheng.xu@amlogic.com From: Jiucheng Xu The endio decompression path of erofs calls vm_map_ram(). Due to insufficient memory, this function may generate memory swapping I/O, which can cause submit_bio_wait to deadlock in some scenarios. Trimmed down the call stack, as follows: f2fs_submit_read_io submit_bio //bio_list is initialized. mmc_blk_mq_recovery z_erofs_endio vm_map_ram __pte_alloc_kernel __alloc_pages_direct_reclaim shrink_folio_list __swap_writepage submit_bio_wait //bio_list is non-NULL, hang!!! Use memalloc_noio_{save,restore}() to wrap up this path. Signed-off-by: Jiucheng Xu --- fs/erofs/zdata.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c index 3977e42b9516861bf3d59c072b6b8aaa6898dd8a..fe8121df9ef2f2404fc6e3f0fbbd6367f9ec2c67 100644 --- a/fs/erofs/zdata.c +++ b/fs/erofs/zdata.c @@ -1445,6 +1445,7 @@ static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io, int bios) { struct erofs_sb_info *const sbi = EROFS_SB(io->sb); + int gfp_flag; /* wake up the caller thread for sync decompression */ if (io->sync) { @@ -1477,7 +1478,9 @@ static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io, sbi->sync_decompress = EROFS_SYNC_DECOMPRESS_FORCE_ON; return; } + gfp_flag = memalloc_noio_save(); z_erofs_decompressqueue_work(&io->u.work); + memalloc_noio_restore(gfp_flag); } static void z_erofs_fill_bio_vec(struct bio_vec *bvec, --- base-commit: 11439c4635edd669ae435eec308f4ab8a0804808 change-id: 20260311-origin-dev-1c9665798204 Best regards, -- Jiucheng Xu