ci starts bisection 2026-07-14 15:50:38.208513692 +0000 UTC m=+62966.387142580
bisecting fixing commit since 192c0159402e6bfbe13de6f8379546943297783d
building syzkaller on 75707236357ca67459cba5dc9d48a9d3e062870f
ensuring issue is reproducible on original commit 192c0159402e6bfbe13de6f8379546943297783d

testing commit 192c0159402e6bfbe13de6f8379546943297783d gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: d2c7a9f6cdf5806801bbcd5b45afd2ae922d40837c75f694e8481c9c0799139b
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 [ubsan bug_or_warning kasan locking atomic_sleep hang memleak], they are not needed
testing commit 192c0159402e6bfbe13de6f8379546943297783d gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 9fc4da0182a4f0a74655fe6f43bf9c4fdf60939a17c56a4cb08f8c6c5943a1c2
run #0: crashed: lost connection to test machine
run #1: crashed: lost connection to test machine
run #2: crashed: lost connection to test machine
run #3: crashed: lost connection to test machine
run #4: crashed: lost connection to test machine
run #5: crashed: lost connection to test machine
run #6: crashed: lost connection to test machine
run #7: crashed: lost connection to test machine
run #8: basic kernel testing failed: lost connection to test machine
run #9: 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 [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
kconfig minimization: base=4147 full=8593 leaves diff=2176
split chunks (needed=false): <2176>
split chunk #0 of len 2176 into 5 parts
testing without sub-chunk 1/5
disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed
testing commit 192c0159402e6bfbe13de6f8379546943297783d gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 9a0b2b61ba0d1a362db3dcbd8c46f97163e9c3177f928ef5beab813a7a7b9c52
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 [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
testing commit 192c0159402e6bfbe13de6f8379546943297783d gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: d99af6283febd6ce38d131342e8cc7248403b6dc8bc636bdff0f744084ff3c30
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 [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
testing commit 192c0159402e6bfbe13de6f8379546943297783d gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 4ee4aa4add0b896919a75f02a3869e3f800e3992b45a1c80d98621908dc120fe
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 [ubsan bug_or_warning kasan locking atomic_sleep hang memleak], they are not needed
testing commit 192c0159402e6bfbe13de6f8379546943297783d gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 0882eb17f101878ba23fdec6cd85a27fb83761b543f318df661d6c61d5fd3ed1
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 [kasan locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed
testing commit 192c0159402e6bfbe13de6f8379546943297783d gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 6e391d15a7212b78c0b57d92ad1007f6a60744ef8c6522be8bd2319098ff7bbc
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 [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], 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: 82dfa57f9dcb55da775cb17cb6cc0f07579576ec933eece88faf02f39ebadfff
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: 7h21m36.120806916s (build: 6h3m6.849146922s, test: 32m32.159923169s)
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