On Wed Jun 10, 2026 at 6:49 PM CEST, Bruce Ashfield via lists.openembedded.org wrote: > From: Bruce Ashfield <[email protected]> > > Updating linux-yocto/6.6 to the latest korg -stable release that comprises > the following commits: > > c09fbcd31ae6 Linux 6.6.130 > [...] > dc7c9b9d03a5 ext4: drop extent cache when splitting extent fails > f0931a5c1700 ext4: drop extent cache after doing PARTIAL_VALID1 zeroout > 67cdb7bd7442 ext4: don't set EXT4_GET_BLOCKS_CONVERT when splitting > before submitting I/O > 11406eb96a19 ext4: correct the comments place for EXT4_EXT_MAY_ZEROOUT
Hello Bruce, > ed0096fc86b2 ext4: get rid of ppath in ext4_ext_handle_unwritten_extents() > d7b04ea31c6e ext4: get rid of ppath in ext4_ext_convert_to_initialized() > c24ce099bea9 ext4: get rid of ppath in > ext4_convert_unwritten_extents_endio() > 147a6a2725b1 ext4: get rid of ppath in ext4_split_convert_extents() > cda8a34348d7 ext4: get rid of ppath in ext4_split_extent() > 58ddae5d77b1 ext4: don't zero the entire extent if > EXT4_EXT_DATA_PARTIAL_VALID1 > e766534911b3 ext4: subdivide EXT4_EXT_DATA_VALID1 > ffb68fc57207 ext4: get rid of ppath in ext4_split_extent_at() > fb138df7d886 ext4: get rid of ppath in ext4_ext_insert_extent() > 8f6e910852d8 ext4: get rid of ppath in ext4_ext_create_new_leaf() > cafb151eb180 ext4: get rid of ppath in ext4_find_extent() (The following was found by Gemini, but I've checked it) Looks like these commits introduced a bug causing an intermittent LTP regression: https://autobuilder.yoctoproject.org/valkyrie/#/builders/98/builds/3837 -> https://valkyrie.yocto.io/pub/non-release/20260622-121/testresults/qemuarm64-ltp/core-image-sato/qemu_boot_log.20260623002740 [ 6952.500858] Unable to handle kernel paging request at virtual address ffffffffffffffec [ 6952.503768] Mem abort info: [ 6952.504431] ESR = 0x0000000096000005 [ 6952.505333] EC = 0x25: DABT (current EL), IL = 32 bits [ 6952.506541] SET = 0, FnV = 0 [ 6952.507354] EA = 0, S1PTW = 0 [ 6952.508154] FSC = 0x05: level 1 translation fault [ 6952.509208] Data abort info: [ 6952.509849] ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 [ 6952.511175] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 6952.512372] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 6952.513667] swapper pgtable: 4k pages, 39-bit VAs, pgdp=0000000041250000 [ 6952.514909] [ffffffffffffffec] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000 [ 6952.516423] Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP [ 6952.517503] Modules linked in: x_tables tun loop [last unloaded: ip6_tables] [ 6952.518691] CPU: 1 PID: 1078 Comm: kworker/u12:1 Tainted: G W 6.6.142-yocto-standard #1 [ 6952.520269] Hardware name: linux,dummy-virt (DT) [ 6952.521094] Workqueue: writeback wb_workfn (flush-7:0) [ 6952.521985] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 6952.523184] pc : ext4_ext_map_blocks+0x260/0x1860 [ 6952.524011] lr : ext4_ext_map_blocks+0xdb8/0x1860 [ 6952.524851] sp : ffffffc086a3b620 [ 6952.525421] x29: ffffffc086a3b740 x28: ffffffffffffffe4 x27: 000000000000808c [ 6952.526624] x26: ffffff8017dd9000 x25: 000000000000808c x24: 0000000000000002 [ 6952.527849] x23: ffffff8035e766c8 x22: ffffff802e589690 x21: 000000000000042f [ 6952.529087] x20: ffffffc086a3b948 x19: ffffff8035e767f0 x18: 0000000000000000 [ 6952.530310] x17: ffffffc081691310 x16: fffffffe001ab548 x15: 0000005564d4cb48 [ 6952.531519] x14: 00000000ffffffff x13: 0000000000000000 x12: ffffffffffffffc0 [ 6952.532683] x11: 0000000000000040 x10: ffffff8005d81d80 x9 : ffffffc0803cce14 [ 6952.533886] x8 : 00000000bab647bc x7 : 0000000000000000 x6 : 000000000000d847 [ 6952.535065] x5 : 0000000000000000 x4 : 0000000000316019 x3 : 0000000000000000 [ 6952.536264] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffffff803deec880 [ 6952.537425] Call trace: [ 6952.537860] ext4_ext_map_blocks+0x260/0x1860 [ 6952.538589] ext4_map_blocks+0x19c/0x598 [ 6952.539258] ext4_do_writepages+0x5a4/0xbe0 [ 6952.539977] ext4_writepages+0x84/0x110 [ 6952.540624] do_writepages+0x94/0x1e0 [ 6952.541240] __writeback_single_inode+0x60/0x4d8 [ 6952.542086] writeback_sb_inodes+0x208/0x4b0 [ 6952.542812] __writeback_inodes_wb+0x58/0x118 [ 6952.543578] wb_writeback+0x274/0x440 [ 6952.544198] wb_workfn+0x3b0/0x5c8 [ 6952.544788] process_one_work+0x16c/0x3e0 [ 6952.545434] worker_thread+0x1b4/0x378 [ 6952.546059] kthread+0x118/0x128 [ 6952.546599] ret_from_fork+0x10/0x20 [ 6952.547197] Code: 2a0103f9 b9009fe1 b9000e99 b40055fc (79401398) [ 6952.548170] ---[ end trace 0000000000000000 ]--- [ 6952.551090] ------------[ cut here ]------------ Reading the resulting code in 6.6.142: fs/ext4/extents.c: int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, struct ext4_map_blocks *map, int flags) { struct ext4_ext_path *path = NULL; // ... got_allocated_blocks: path = ext4_ext_insert_extent(handle, inode, path, &newex, flags); if (IS_ERR(path)) { err = PTR_ERR(path); /* * Gracefully handle out of space conditions. If the filesystem * is inconsistent, we'll just leak allocated blocks to avoid * causing even more damage. */ // ... goto out; } // ... out: ext4_free_ext_path(path); trace_ext4_ext_map_blocks_exit(inode, flags, map, err ? err : allocated); return err ? err : allocated; } => Under out of space condition (what LTP does a *LOT*): path is given unmodified to ext4_free_ext_path() that only does a NULL check (no IS_ERR) before dereferencing it. And that produces the oops and then, the LTP failure. Notably, master commit 6b854d552711 ("ext4: get rid of ppath in get_ext_path()") never got backported to 6.6.y. But does add the IS_ERR_OR_NULL() check to ext4_free_ext_path: void ext4_free_ext_path(struct ext4_ext_path *path) { + if (IS_ERR_OR_NULL(path)) + return; Bruce, what do you think? Should we backport 6b854d552711·("ext4:·get·rid·of·ppath·in·get_ext_path()")? Ask for it to be backported? Thanks for your help! -- Yoann Congal Smile ECS
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