ci2 starts bisection 2026-01-20 13:20:09.680447503 +0000 UTC m=+13462.464763564
bisecting fixing commit since c750dc582629811994978507b7055b679be149f0
building syzkaller on 32a0e5edfeef60e894c453dc9e9ae45528626ef1
ensuring issue is reproducible on original commit c750dc582629811994978507b7055b679be149f0

testing commit c750dc582629811994978507b7055b679be149f0 gcc
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
kernel signature: b7f888a97127613a0ddef55b9c997d0488dabf7b3d0b79aeb113b28ac9378422
all runs: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
representative crash: kernel panic: EXT4-fs (device loop2): panic forced after error, types: [DoS]
check whether we can drop unnecessary instrumentation
disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed
testing commit c750dc582629811994978507b7055b679be149f0 gcc
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
kernel signature: f420eb159392f8820a4e13cf047108bbfeaae7e05a92708a3375416f4e897d2b
all runs: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
representative crash: kernel panic: EXT4-fs (device loop2): panic forced after error, types: [DoS]
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=5186 full=6556 leaves diff=265
split chunks (needed=false): <265>
split chunk #0 of len 265 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 c750dc582629811994978507b7055b679be149f0 gcc
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
kernel signature: f5f2e5e2096cfc069d973a2dd71db245cc650dfc15bb0ae0d1db473147115c75
all runs: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
representative crash: kernel panic: EXT4-fs (device loop2): panic forced after error, types: [DoS]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed
testing commit c750dc582629811994978507b7055b679be149f0 gcc
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
kernel signature: febf0fc3a1b2084fd479ff32fab35f4325919a448012076f5336defe33ac0223
run #0: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
run #1: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
run #2: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
run #3: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
run #4: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
run #5: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
run #6: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
run #7: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
run #8: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
run #9: basic kernel testing failed: lost connection to test machine
representative crash: kernel panic: EXT4-fs (device loop2): panic forced after error, types: [DoS]
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 c750dc582629811994978507b7055b679be149f0 gcc
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
kernel signature: 8ef2e5b007ebd812bc56b2e82eb3aa4f9f8fb4e292bc910e7971be8a86156375
all runs: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
representative crash: kernel panic: EXT4-fs (device loop2): panic forced after error, types: [DoS]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [bug_or_warning kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit c750dc582629811994978507b7055b679be149f0 gcc
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
kernel signature: eb5ac0f4247a2d1f8a00c8fabf6ab3f2f91a7b1748ade879639d72d80de1a88f
all runs: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
representative crash: kernel panic: EXT4-fs (device loop2): panic forced after error, types: [DoS]
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 c750dc582629811994978507b7055b679be149f0 gcc
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
failed building c750dc582629811994978507b7055b679be149f0: 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 53 configs; suspects: [HID_ZEROPLUS USB_MON USB_NET_CDC_MBIM 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 [kasan locking atomic_sleep hang memleak ubsan bug_or_warning], they are not needed
testing current HEAD 5cc94d93d4c84f145fe4e62957def7d4967772a1
testing commit 5cc94d93d4c84f145fe4e62957def7d4967772a1 gcc
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
kernel signature: 8e1f1b708a8fc05d6dea3e48eb6c4f4cad19b82a69a9fe3b39ad840ac044d1a2
all runs: crashed: kernel panic: EXT4-fs (device loop2): panic forced after error
representative crash: kernel panic: EXT4-fs (device loop2): panic forced after error, types: [DoS]
crash still not fixed/happens on the oldest tested release
revisions tested: 7, total time: 1h35m3.519407009s (build: 51m58.937653408s, test: 38m17.154416069s)
crash still not fixed or there were kernel test errors
commit msg: UPSTREAM: virtio_input: Improve freeze handling
crash: kernel panic: EXT4-fs (device loop2): panic forced after error
loop2: detected capacity change from 0 to 512
ext4: Bad value for 'init_itable'
EXT4-fs error (device loop2): ext4_free_branches:1030: inode #13: comm syz.2.17: invalid indirect mapped block 10 (level 1)
Kernel panic - not syncing: EXT4-fs (device loop2): panic forced after error
Kernel Offset: disabled
Rebooting in 86400 seconds..