ci starts bisection 2026-07-14 10:23:32.439095595 +0000 UTC m=+43340.617724466
bisecting fixing commit since cd802e7e5f1e77ae68cd98653fb70a97189eb937
building syzkaller on 77908e5f2ae80bee6d434bca762a25a0a5fc6a83
ensuring issue is reproducible on original commit cd802e7e5f1e77ae68cd98653fb70a97189eb937

testing commit cd802e7e5f1e77ae68cd98653fb70a97189eb937 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 9ecc7fdcc49a69cd83cd367f0ef97d7672180c6714e54b5582b40299ac05a2e0
all runs: crashed: lost connection to test machine
representative crash: lost connection to test machine, types: [LOST_CONNECTION]
check whether we can drop unnecessary instrumentation
disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
testing commit cd802e7e5f1e77ae68cd98653fb70a97189eb937 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 66399500f58e8acd75dafdadec260556f64458d8603d03e1c8edc0dba59f21d5
all runs: crashed: lost connection to test machine
representative crash: lost connection to test machine, types: [LOST_CONNECTION]
the bug reproduces without the instrumentation
disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed
kconfig minimization: base=4147 full=8329 leaves diff=2186
split chunks (needed=false): <2186>
split chunk #0 of len 2186 into 5 parts
testing without sub-chunk 1/5
disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed
testing commit cd802e7e5f1e77ae68cd98653fb70a97189eb937 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 0749111a3b65b510056f227c86bd54e5014b92c4f1af82614b8fbbc3ab753c59
all runs: crashed: lost connection to test machine
representative crash: lost connection to test machine, types: [LOST_CONNECTION]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed
testing commit cd802e7e5f1e77ae68cd98653fb70a97189eb937 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: cf2b8d66330d53027841eea0c49bc35ced344863af9d5cde95e52f8f95e02d67
all runs: crashed: lost connection to test machine
representative crash: lost connection to test machine, types: [LOST_CONNECTION]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed
testing commit cd802e7e5f1e77ae68cd98653fb70a97189eb937 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: fede4a61322752fb687ed705e8809e1651aa82317ea56e017cd41b8185704e59
all runs: crashed: lost connection to test machine
representative crash: lost connection to test machine, types: [LOST_CONNECTION]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed
testing commit cd802e7e5f1e77ae68cd98653fb70a97189eb937 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: b901c544d9ec32ac7b28c033643137beda53b4489fc091df106dcab25b1773ea
all runs: crashed: lost connection to test machine
representative crash: lost connection to test machine, types: [LOST_CONNECTION]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed
testing commit cd802e7e5f1e77ae68cd98653fb70a97189eb937 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: c2d60edbb195f8f2993e9e0e61739f42f8d420ca7abffed705f42d6710b1ec61
all runs: crashed: lost connection to test machine
representative crash: lost connection to test machine, types: [LOST_CONNECTION]
the chunk can be dropped
disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed
testing current HEAD 3b029c035b34bbc693405ddf759f0e9b920c27f1
testing commit 3b029c035b34bbc693405ddf759f0e9b920c27f1 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 0257b7fd642e951cf19b25a6fb493acc4b327a25ebb4b5351804d7f124887e05
all runs: crashed: lost connection to test machine
representative crash: lost connection to test machine, types: [LOST_CONNECTION]
crash still not fixed/happens on the oldest tested release
revisions tested: 8, total time: 4h20m9.739771468s (build: 2h54m1.41421376s, test: 50m41.33943621s)
crash still not fixed or there were kernel test errors
commit msg: Merge tag 'cgroup-for-7.2-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
crash: lost connection to test machine