ci starts bisection 2026-07-28 15:24:15.458267968 +0000 UTC m=+782.786116973
bisecting cause commit starting from 9c88929cc18cdc252aa8a57e9fa8cb441dc47642
building syzkaller on 45ae1df4af5febc9aed5d79b1d9e3ab74e38d810
ensuring issue is reproducible on original commit 9c88929cc18cdc252aa8a57e9fa8cb441dc47642

testing commit 9c88929cc18cdc252aa8a57e9fa8cb441dc47642 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 2a721d21bdb1596f2223a53ea8a43f10c107005b953739cd062839167aa101f9
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 9c88929cc18cdc252aa8a57e9fa8cb441dc47642 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: f111252dfe30f39e2f870c802229281c872e6b8671426ba965581aa680f22c3f
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 [kasan locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed
kconfig minimization: base=4147 full=8606 leaves diff=2151
split chunks (needed=false): <2151>
split chunk #0 of len 2151 into 5 parts
testing without sub-chunk 1/5
disabling configs for [ubsan bug_or_warning kasan locking atomic_sleep hang memleak], they are not needed
testing commit 9c88929cc18cdc252aa8a57e9fa8cb441dc47642 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 61d1a8e86f7f75cbaa5522f89979ef3998d36bb0f1e0edad7e7c16ea141801b1
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 [bug_or_warning kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit 9c88929cc18cdc252aa8a57e9fa8cb441dc47642 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 2cd1f265374c57b57ebe3e437966e7dd896989ee9c9ec02c9bdb3a929a061cca
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 [kasan locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed
testing commit 9c88929cc18cdc252aa8a57e9fa8cb441dc47642 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: f7e7d259d9c1fee7a270b70b384f1cb914e9753b731f752fbc1a2d8ab2fb5bcf
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
revisions tested: 5, total time: 12h16m38.582810657s (build: 5h3m24.216293436s, test: 21m45.150186565s)
error: config minimization failed: bisection is taking too long (>12h0m0s), aborting