ci2 starts bisection 2026-06-23 02:21:10.866369359 +0000 UTC m=+34769.487224824
bisecting fixing commit since 108b53924ea33cadfc5b446f4e1d841465f278f1
building syzkaller on c69befb30ac10e158cc9d1557b508ee3f0eca1de
ensuring issue is reproducible on original commit 108b53924ea33cadfc5b446f4e1d841465f278f1

testing commit 108b53924ea33cadfc5b446f4e1d841465f278f1 gcc
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
kernel signature: ea269b213a0a1184ca45a5655c6f7f720b07ae097cdf3c8c560ce841966780e7
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 [kasan locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed
testing commit 108b53924ea33cadfc5b446f4e1d841465f278f1 gcc
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
kernel signature: c2ff38daa1c2bb0646259c550edab5219bc10fe25ad2b4ed43299ccf59a768ce
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 [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
kconfig minimization: base=5186 full=6558 leaves diff=267
split chunks (needed=false): <267>
split chunk #0 of len 267 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 108b53924ea33cadfc5b446f4e1d841465f278f1 gcc
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
kernel signature: 3e497ba9fb9fe97cc08106584046c0ec7fad0418bdf47456e546f65bba29ae7a
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 [ubsan bug_or_warning kasan locking atomic_sleep hang memleak], they are not needed
testing commit 108b53924ea33cadfc5b446f4e1d841465f278f1 gcc
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
kernel signature: b24527c7151552f25ffb23a2b816bf73c5868ecba6d5a8ede5266822f90beea0
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 [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed
testing commit 108b53924ea33cadfc5b446f4e1d841465f278f1 gcc
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
kernel signature: 4f31420f785e81eb9b7a6908a8bd64d6704b2b015f9f6bd8523baa3a023709b5
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 108b53924ea33cadfc5b446f4e1d841465f278f1 gcc
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
kernel signature: d61348f3fe44c2bed1962850d0c1497ea97284969de1b83b62c42e784b259324
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 [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed
testing commit 108b53924ea33cadfc5b446f4e1d841465f278f1 gcc
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
failed building 108b53924ea33cadfc5b446f4e1d841465f278f1: ld.lld: error: undefined symbol: wext_proc_init
ld.lld: error: undefined symbol: wext_proc_exit
ld.lld: error: undefined symbol: wext_handle_ioctl
ld.lld: error: undefined symbol: compat_wext_handle_ioctl
minimized to 51 configs; suspects: [HAVE_CLK HID_ZEROPLUS USB_NET_CDC_SUBSET USB_NET_CDC_SUBSET_ENABLE USB_NET_DM9601 USB_NET_GL620A USB_NET_MCS7830 USB_NET_NET1080 USB_NET_PLUSB USB_NET_RNDIS_HOST USB_NET_SMSC75XX USB_NET_SMSC95XX USB_NET_SR9700 USB_NET_SR9800 USB_NET_ZAURUS USB_OHCI_HCD USB_OHCI_HCD_PCI USB_OHCI_HCD_PLATFORM USB_OTG USB_OTG_FSM USB_PRINTER USB_SERIAL_GENERIC USB_SERIAL_PL2303 USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_TRANCEVIBRATOR USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_WDM V4L2_ASYNC V4L2_FWNODE VIDEO_CAMERA_SENSOR WLAN WLAN_VENDOR_ATH WLAN_VENDOR_ATMEL WLAN_VENDOR_BROADCOM WLAN_VENDOR_INTERSIL WLAN_VENDOR_MARVELL WLAN_VENDOR_MEDIATEK WLAN_VENDOR_MICROCHIP WLAN_VENDOR_PURELIFI WLAN_VENDOR_RALINK WLAN_VENDOR_REALTEK WLAN_VENDOR_RSI WLAN_VENDOR_SILABS WLAN_VENDOR_ZYDAS ZEROPLUS_FF]
disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed
testing current HEAD de145cc20dc6450867bcbeda441dafeee3750178
testing commit de145cc20dc6450867bcbeda441dafeee3750178 gcc
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
kernel signature: df6985963bf1902eaa9f472789d9741d81f274a255533b6defb03f872df81c77
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: 7, total time: 1h55m1.799848714s (build: 54m31.953734138s, test: 31m52.06695164s)
crash still not fixed or there were kernel test errors
commit msg: BACKPORT: mm/memcontrol: fix seq_buf size to save memory when PAGE_SIZE is large
crash: lost connection to test machine