ci starts bisection 2026-09-12 05:04:40.287055351 +0000 UTC m=+109.801534913
bisecting cause commit starting from 08df884136f1c1197bab2a27814404fd329d9aac
building syzkaller on b6a5eeb7114b1887514b0d74ca39167dfbfa4603
ensuring issue is reproducible on original commit 08df884136f1c1197bab2a27814404fd329d9aac

testing commit 08df884136f1c1197bab2a27814404fd329d9aac gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: e592db93ca8c24b0ede34dd9789f255c199c84425dc21b55ae384a5500d4c603
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
check whether we can drop unnecessary instrumentation
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit 08df884136f1c1197bab2a27814404fd329d9aac gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 3a34edc88e30562948f92ac2f9887c8b5ed0e985fdb15b7bbaa44f1db36d7ba2
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
the bug reproduces without the instrumentation
disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed
kconfig minimization: base=4175 full=8661 leaves diff=2142
split chunks (needed=false): <2142>
split chunk #0 of len 2142 into 5 parts
testing without sub-chunk 1/5
disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed
testing commit 08df884136f1c1197bab2a27814404fd329d9aac gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: f349453b8d1c840e2aca49c6d27d79c696499b0b80f1c7bfa0c6503804747a50
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
testing commit 08df884136f1c1197bab2a27814404fd329d9aac gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 74419dd7a60eecddf88e35e00c24dd41ddae551d73ee1993f021a0a4dfe6951f
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
testing commit 08df884136f1c1197bab2a27814404fd329d9aac gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: e06db0d7617f7fc426ec292fcf04c3f574a54f95af8d09ebdba17ebf03cc8476
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
testing commit 08df884136f1c1197bab2a27814404fd329d9aac gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 417f4686905db6a300a75d3103405e869cc63ff55f1322be30c183f8aa14e843
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed
testing commit 08df884136f1c1197bab2a27814404fd329d9aac gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 2cbdb7ceac636dfc39c1065c53581625884f07bdaf68db65d1d08ee954f643ca
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
the chunk can be dropped
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
picked [v7.2 v7.1 v7.0 v6.18 v6.16 v6.14 v6.12 v6.10 v6.7 v6.4 v6.1 v5.18 v5.15 v5.12 v5.9 v5.6 v5.3 v5.0 v4.19] out of 45 release tags
testing release v7.2
testing commit 8d3ae59288f1e7d58d76558a6ee96d533bc5019f gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: c427e0513f606a36c990b015cb90dffb208fed051d570316294bcf4b555ce6ad
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
testing release v7.1
testing commit 8cd9520d35a6c38db6567e97dd93b1f11f185dc6 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: e8ad2e637ca386d400b5a14bc0058f14dc09bbceed9b6fe28a7e4b4d92d61f5a
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
testing release v7.0
testing commit 028ef9c96e96197026887c0f092424679298aae8 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 154234b33da416ddebf387f54d9b569b8c20b52de026d44221e47a4df2909bed
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
testing release v6.18
testing commit 7d0a66e4bb9081d75c82ec4957c50034cb0ea449 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: b54706ca4c54bd1b2d0d1fcc1c9f6f290f3ff6230765114ba19c85bb2602cc0b
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
testing release v6.16
testing commit 038d61fd642278bab63ee8ef722c50d10ab01e8f gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 0e939711461727d0ad1b78a7af91583168c3db649e4aec6e01cd1bbcdd70af11
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
testing release v6.14
testing commit 38fec10eb60d687e30c8c6b5420d86e8149f7557 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 31e6e25feaac82088dc2fd9bbf3f21f911eedd5825625367f8ab811add6d45e1
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
testing release v6.12
testing commit adc218676eef25575469234709c2d87185ca223a gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: f4a17089ab57076d94b20a54ce3390e1469be21c50f04e1db4ccb426f0ee08f1
all runs: crashed: WARNING in vfat_update_dotdot_de
representative crash: WARNING in vfat_update_dotdot_de, types: [WARNING]
testing release v6.10
revisions tested: 14, total time: 12h16m46.425125254s (build: 5h3m56.887520992s, test: 1h37m56.164186998s)
error: bisection is taking too long (>12h0m0s), aborting