ci starts bisection 2026-07-23 02:05:08.368579887 +0000 UTC m=+26776.905990239
bisecting fixing commit since 45255ea1ca096b11b1303c9b54502a28f3a31dd1
building syzkaller on c69befb30ac10e158cc9d1557b508ee3f0eca1de
ensuring issue is reproducible on original commit 45255ea1ca096b11b1303c9b54502a28f3a31dd1

testing commit 45255ea1ca096b11b1303c9b54502a28f3a31dd1 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 5e855d1769b25c44f00dd7581ef8d6b2ba05e5724db443cdc78fc2eb57196cf0
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 [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed
testing commit 45255ea1ca096b11b1303c9b54502a28f3a31dd1 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: db7a944ca8e9b3ce104cdd21e20c0f466352d1c24b0650df8591031e11396a83
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 [ubsan bug_or_warning kasan locking atomic_sleep hang memleak], they are not needed
kconfig minimization: base=4147 full=8588 leaves diff=2148
split chunks (needed=false): <2148>
split chunk #0 of len 2148 into 5 parts
testing without sub-chunk 1/5
disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
testing commit 45255ea1ca096b11b1303c9b54502a28f3a31dd1 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 32d3010779800a631e42680b7e4caeaa84de050375e37e46d0bce2b18c506ac3
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 45255ea1ca096b11b1303c9b54502a28f3a31dd1 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: a7c9a5ba27eea47dbdff97352821c1ebf337e96a530b5bd21a1c0c00f44af5d0
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 45255ea1ca096b11b1303c9b54502a28f3a31dd1 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: f663b63be37dc45d1955f793fb0cc04e73e479e48a22b59b38c215cacb5962ca
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 [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
testing commit 45255ea1ca096b11b1303c9b54502a28f3a31dd1 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 767672b5b501979101e51e5134e149ea40e5025a0a187e962f7fa707ae5416f7
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 45255ea1ca096b11b1303c9b54502a28f3a31dd1 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: 24c8a2f93d463ba5e6e1092a5a46ae6d45d35a8d1b8ee5e49bbf66bf7adfb461
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 [ubsan bug_or_warning kasan locking atomic_sleep hang memleak], they are not needed
testing current HEAD 4539944e515183668109bdf4d0c3d7d228383d88
testing commit 4539944e515183668109bdf4d0c3d7d228383d88 gcc
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
kernel signature: ddc107d1926c7246a5f292ab8f235518317fd8f484e197a3490986c33d980086
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: 2h17m56.669698304s (build: 1h10m9.277336247s, test: 31m15.080932931s)
crash still not fixed or there were kernel test errors
commit msg: Merge tag 'liveupdate-fixes-2026-07-22' of git://git.kernel.org/pub/scm/linux/kernel/git/liveupdate/linux
crash: lost connection to test machine