Re: [f2fs-dev] [PATCH 3/3] f2fs: fix false alarm on invalid block address

Juhyung Park
2024-04-19T10:27:33Z

On Sat, Apr 13, 2024 at 5:57 AM Jaegeuk Kim <jaegeuk@kernel.org> wrote:
>
> On 04/11, Chao Yu wrote:
> > On 2024/4/10 4:34, Jaegeuk Kim wrote:
> > > f2fs_ra_meta_pages can try to read ahead on invalid block address which is
> > > not the corruption case.
> >
> > In which case we will read ahead invalid meta pages? recovery w/ META_POR?

In my case, it seems like it's META_SIT, and it's triggered right after mount.
fsck detects invalid_blkaddr, and when the kernel mounts it, it
immediately flags invalid_blkaddr again:

[ 6.333498] init: [libfs_mgr] Running /system/bin/fsck.f2fs -a -c
10000 --debug-cache /dev/block/sda13
[ 6.337671] fsck.f2fs: Info: Fix the reported corruption.
[ 6.337947] fsck.f2fs: Info: not exist /proc/version!
[ 6.338010] fsck.f2fs: Info: can't find /sys, assuming normal block device
[ 6.338294] fsck.f2fs: Info: MKFS version
[ 6.338319] fsck.f2fs: "5.10.160-android12-9-ge5cfec41c8e2"
[ 6.338366] fsck.f2fs: Info: FSCK version
[ 6.338380] fsck.f2fs: from "5.10-arter97"
[ 6.338393] fsck.f2fs: to "5.10-arter97"
[ 6.338414] fsck.f2fs: Info: superblock features = 1499 : encrypt
verity extra_attr project_quota quota_ino casefold
[ 6.338429] fsck.f2fs: Info: superblock encrypt level = 0, salt =
00000000000000000000000000000000
[ 6.338442] fsck.f2fs: Info: checkpoint stop reason: shutdown(180)
[ 6.338455] fsck.f2fs: Info: fs errors: invalid_blkaddr
[ 6.338468] fsck.f2fs: Info: Segments per section = 1
[ 6.338480] fsck.f2fs: Info: Sections per zone = 1
[ 6.338492] fsck.f2fs: Info: total FS sectors = 58971571 (230357 MB)
[ 6.340599] fsck.f2fs: Info: CKPT version = 2b7e3b29
[ 6.340620] fsck.f2fs: Info: version timestamp cur: 19789296, prev: 18407008
[ 6.677041] fsck.f2fs: Info: checkpoint state = 46 : crc
compacted_summary orphan_inodes sudden-power-off
[ 6.677052] fsck.f2fs: [FSCK] Check node 1 / 712937 (0.00%)
[ 8.997922] fsck.f2fs: [FSCK] Check node 71294 / 712937 (10.00%)
[ 10.629205] fsck.f2fs: [FSCK] Check node 142587 / 712937 (20.00%)
[ 12.278186] fsck.f2fs: [FSCK] Check node 213880 / 712937 (30.00%)
[ 13.768177] fsck.f2fs: [FSCK] Check node 285173 / 712937 (40.00%)
[ 17.446971] fsck.f2fs: [FSCK] Check node 356466 / 712937 (50.00%)
[ 19.891623] fsck.f2fs: [FSCK] Check node 427759 / 712937 (60.00%)
[ 23.251327] fsck.f2fs: [FSCK] Check node 499052 / 712937 (70.00%)
[ 28.493457] fsck.f2fs: [FSCK] Check node 570345 / 712937 (80.00%)
[ 29.640800] fsck.f2fs: [FSCK] Check node 641638 / 712937 (90.00%)
[ 30.718347] fsck.f2fs: [FSCK] Check node 712931 / 712937 (100.00%)
[ 30.724176] fsck.f2fs:
[ 30.737160] fsck.f2fs: [FSCK] Max image size: 167506 MB, Free space: 62850 MB
[ 30.737164] fsck.f2fs: [FSCK] Unreachable nat entries
[Ok..] [0x0]
[ 30.737638] fsck.f2fs: [FSCK] SIT valid block bitmap checking
[Ok..]
[ 30.737640] fsck.f2fs: [FSCK] Hard link checking for regular file
[Ok..] [0xd]
[ 30.737641] fsck.f2fs: [FSCK] valid_block_count matching with CP
[Ok..] [0x28b98e6]
[ 30.737644] fsck.f2fs: [FSCK] valid_node_count matching with CP (de
lookup) [Ok..] [0xae0e9]
[ 30.737646] fsck.f2fs: [FSCK] valid_node_count matching with CP
(nat lookup) [Ok..] [0xae0e9]
[ 30.737647] fsck.f2fs: [FSCK] valid_inode_count matched with CP
[Ok..] [0xa74a3]
[ 30.737649] fsck.f2fs: [FSCK] free segment_count matched with CP
[Ok..] [0x7aa3]
[ 30.737662] fsck.f2fs: [FSCK] next block offset is free
[Ok..]
[ 30.737663] fsck.f2fs: [FSCK] fixing SIT types
[ 30.737867] fsck.f2fs: [FSCK] other corrupted bugs
[Ok..]
[ 30.737893] fsck.f2fs: [update_superblock: 765] Info: Done to
update superblock
[ 30.960610] fsck.f2fs:
[ 30.960618] fsck.f2fs: Done: 24.622956 secs
[ 30.960620] fsck.f2fs:
[ 30.960622] fsck.f2fs: c, u, RA, CH, CM, Repl=
[ 30.960627] fsck.f2fs: 10000 10000 43600517 42605434 995083 985083
[ 30.963274] F2FS-fs (sda13): Using encoding defined by superblock:
utf8-12.1.0 with flags 0x0
[ 30.995360] __f2fs_is_valid_blkaddr: type=2

(Manually added that print ^)

[ 30.995369] ------------[ cut here ]------------
[ 30.995375] WARNING: CPU: 7 PID: 1 at f2fs_handle_error+0x18/0x3c
[ 30.995378] CPU: 7 PID: 1 Comm: init Tainted: G S W
5.10.209-arter97-r15-kernelsu-g0867d0e4f1d2 #6
[ 30.995379] Hardware name: Qualcomm Technologies, Inc. Cape QRD
with PM8010 (DT)
[ 30.995380] pstate: 22400005 (nzCv daif +PAN -UAO +TCO BTYPE=--)
[ 30.995382] pc : f2fs_handle_error+0x18/0x3c
[ 30.995384] lr : __f2fs_is_valid_blkaddr+0x2a4/0x2b0
[ 30.995385] sp : ffffff80209e79b0
[ 30.995386] x29: ffffff80209e79b0 x28: 0000000000000037
[ 30.995388] x27: 00000000000001c7 x26: 0000000020120121
[ 30.995389] x25: 00000000000000d9 x24: 0000000000000000
[ 30.995390] x23: ffffffff00f1a700 x22: 0000000000000828
[ 30.995391] x21: ffffff80462aa000 x20: ffffff80462aa000
[ 30.995392] x19: 0000000000000002 x18: ffffffffffffffff
[ 30.995393] x17: 0000000000000000 x16: 00000000ffff0000
[ 30.995394] x15: 0000000000000004 x14: ffffffd1675ac6d0
[ 30.995395] x13: 0000000000000003 x12: 0000000000000003
[ 30.995396] x11: 00000000ffffffff x10: 0000000000000000
[ 30.995397] x9 : 0000000100000001 x8 : 0000000100000000
[ 30.995398] x7 : 64696c61765f7369 x6 : ffffffd1681279e8
[ 30.995399] x5 : 000000000000001f x4 : 0000000000000001
[ 30.995400] x3 : 0000000000000000 x2 : ffffff89f03dedc8
[ 30.995401] x1 : 0000000000000002 x0 : ffffff80462aa000
[ 30.995403] Call trace:
[ 30.995404] f2fs_handle_error+0x18/0x3c
[ 30.995405] __f2fs_is_valid_blkaddr+0x2a4/0x2b0
[ 30.995406] f2fs_is_valid_blkaddr+0x10/0x20
[ 30.995407] f2fs_ra_meta_pages+0xe0/0x230
[ 30.995409] build_sit_entries+0xa8/0x580
[ 30.995411] f2fs_build_segment_manager+0x124/0x170
[ 30.995412] f2fs_fill_super+0x78c/0xd1c
[ 30.995415] mount_bdev+0x168/0x1ac
[ 30.995416] f2fs_mount+0x18/0x24
[ 30.995418] legacy_get_tree.llvm.9147845779559715083+0x30/0x5c
[ 30.995419] vfs_get_tree+0x30/0xe0
[ 30.995421] do_new_mount+0x140/0x358
[ 30.995422] path_mount+0x1fc/0x4e8
[ 30.995423] __arm64_sys_mount+0x150/0x294
[ 30.995425] el0_svc_common.llvm.15698454952154965787+0xa8/0x138
[ 30.995426] do_el0_svc+0x24/0x90
[ 30.995429] el0_svc+0x10/0x1c
[ 30.995430] el0_sync_handler+0xcc/0xe4
[ 30.995432] el0_sync+0x1a0/0x1c0
[ 30.995433] ---[ end trace 3b83295e0cdac94e ]---
[ 31.005011] F2FS-fs (sda13): Mounted with checkpoint version = 2b7e3b29
[ 31.005176] init: [libfs_mgr]
__mount(source=/dev/block/bootdevice/by-name/userdata,target=/data,type=f2fs)=0:
Success
[ 31.007749] init: Userdata mounted using /vendor/etc/fstab.qcom result : 0

I was bisecting a long boot time (24 additional seconds) issue, which
is always reproducible, and found commit 31f85ccc84b8 ("f2fs: unify
the error handling of f2fs_is_valid_blkaddr") to be causing it.

I'll just revert that patch locally. Seems like Jaegeuk's dev branch
doesn't have the fix for this specifically yet.

Thanks.

>
> I was trying to debug another issue, but found the root cause. Let me drop this
> patch.
>
> >
> > Thanks,
> >
> > >
> > > Fixes: 31f85ccc84b8 ("f2fs: unify the error handling of f2fs_is_valid_blkaddr")
> > > Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> > > ---
> > > fs/f2fs/checkpoint.c | 9 +++++----
> > > 1 file changed, 5 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> > > index eac698b8dd38..b01320502624 100644
> > > --- a/fs/f2fs/checkpoint.c
> > > +++ b/fs/f2fs/checkpoint.c
> > > @@ -179,22 +179,22 @@ static bool __f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
> > > break;
> > > case META_SIT:
> > > if (unlikely(blkaddr >= SIT_BLK_CNT(sbi)))
> > > - goto err;
> > > + goto check_only;
> > > break;
> > > case META_SSA:
> > > if (unlikely(blkaddr >= MAIN_BLKADDR(sbi) ||
> > > blkaddr < SM_I(sbi)->ssa_blkaddr))
> > > - goto err;
> > > + goto check_only;
> > > break;
> > > case META_CP:
> > > if (unlikely(blkaddr >= SIT_I(sbi)->sit_base_addr ||
> > > blkaddr < __start_cp_addr(sbi)))
> > > - goto err;
> > > + goto check_only;
> > > break;
> > > case META_POR:
> > > if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
> > > blkaddr < MAIN_BLKADDR(sbi)))
> > > - goto err;
> > > + goto check_only;
> > > break;
> > > case DATA_GENERIC:
> > > case DATA_GENERIC_ENHANCE:
> > > @@ -228,6 +228,7 @@ static bool __f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
> > > return true;
> > > err:
> > > f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
> > > +check_only:
> > > return false;
> > > }
>
>
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