ci starts bisection 2026-07-08 13:59:24.357525175 +0000 UTC m=+10872.026907470
bisecting fixing commit since 1d51b370a0f8f642f4fc84c795fbedac0fcdbbd2
building syzkaller on 321ae2253224dcaba7aa6a463e9810150ca76967
ensuring issue is reproducible on original commit 1d51b370a0f8f642f4fc84c795fbedac0fcdbbd2

testing commit 1d51b370a0f8f642f4fc84c795fbedac0fcdbbd2 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 94927848190b680be3ad19bdd7f0091962be8ecc5ea2ec3d4e05b74593ac5479
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 1d51b370a0f8f642f4fc84c795fbedac0fcdbbd2 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 88db079bc1ab33b382c8efc9c7875a9a5b29ebb4baf1c0b7844e184795fde9a9
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 [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed
kconfig minimization: base=4147 full=8629 leaves diff=2163
split chunks (needed=false): <2163>
split chunk #0 of len 2163 into 5 parts
testing without sub-chunk 1/5
disabling configs for [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed
testing commit 1d51b370a0f8f642f4fc84c795fbedac0fcdbbd2 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 437e2c0936c7ae9084edbcfbe91daa053faf5207e3bb6326cb9af59544e3e75e
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 1d51b370a0f8f642f4fc84c795fbedac0fcdbbd2 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: ae517792cade3ea73414d563c7bde3f0e347b955eed376ecbc8b6e070a7dfc1c
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 1d51b370a0f8f642f4fc84c795fbedac0fcdbbd2 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: a6e05a728fbc2d8c3be85955e8673cab22e0f7e0d0a8f62c8bb7d8fe83a73f36
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 [kasan locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed
testing commit 1d51b370a0f8f642f4fc84c795fbedac0fcdbbd2 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 3f6e64e9fc41e047c07e0dba925d3bef49eed942004d2ffc72065d314a0e25bf
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 1d51b370a0f8f642f4fc84c795fbedac0fcdbbd2 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 00b49793f4862fc13d94c7df44f59355bd34d5bd575c2c3b1a2ef87c156e1408
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 [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
testing current HEAD 0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53
testing commit 0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 4812316ed9cc6573cbfcea1998465c7af83ae68f792074d230a8fae0d505a197
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: 5h31m26.974294921s (build: 3h19m34.564588448s, test: 45m2.707736045s)
crash still not fixed or there were kernel test errors
commit msg: Merge tag 'mm-hotfixes-stable-2026-07-06-17-49' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
crash: lost connection to test machine