ci2 starts bisection 2026-02-21 10:12:06.229590705 +0000 UTC m=+56860.438279298
bisecting fixing commit since e253c52bbdfce1f214777784549a350a8f9ba3b8
building syzkaller on d6526ea3e6ad9081c902859bbb80f9f840377cb4
ensuring issue is reproducible on original commit e253c52bbdfce1f214777784549a350a8f9ba3b8

testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: ab906f4a09b998cde8b634c6c63f58409246ed14d45f718b38eabf9267679e5c
run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #1: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #2: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #3: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #4: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #8: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #9: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #10: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #11: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #12: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #13: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #14: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #15: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #16: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #17: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #18: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #19: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
representative crash: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow, types: [NULL-POINTER-DEREFERENCE]
check whether we can drop unnecessary instrumentation
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 19af27fb21a30774a94832b6e2c9dcab3bfc9ec0215a632361cb51f047daea5f
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
representative crash: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow, types: [NULL-POINTER-DEREFERENCE]
the bug reproduces without the instrumentation
disabling configs for [hang memleak ubsan kasan locking atomic_sleep], they are not needed
kconfig minimization: base=4788 full=6026 leaves diff=248
split chunks (needed=false): <248>
split chunk #0 of len 248 into 5 parts
testing without sub-chunk 1/5
disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed
testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: b46b5802b926d47f1440953e3bfdbc24004fdaa53134619d02d69ca3d233f675
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
representative crash: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow, types: [NULL-POINTER-DEREFERENCE]
the chunk can be dropped
testing without sub-chunk 2/5
disabling configs for [ubsan kasan locking atomic_sleep hang memleak], they are not needed
testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: b946d3c1f95891da44e17d3d6484bbef8ee1b681e458da76207722a276390bfc
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
representative crash: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow, types: [NULL-POINTER-DEREFERENCE]
the chunk can be dropped
testing without sub-chunk 3/5
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: 4026e9c3377527abcbe27ea67661c605b95abc989638a59f210ae3ea3e1ef2c1
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
representative crash: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow, types: [NULL-POINTER-DEREFERENCE]
the chunk can be dropped
testing without sub-chunk 4/5
disabling configs for [atomic_sleep hang memleak ubsan kasan locking], they are not needed
testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: e3ca95bea746ecf2ccc300e3d4d7894dbd97437724c567a4d9664044895f923c
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
representative crash: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow, types: [NULL-POINTER-DEREFERENCE]
the chunk can be dropped
testing without sub-chunk 5/5
disabling configs for [locking atomic_sleep hang memleak ubsan kasan], they are not needed
testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
failed building e253c52bbdfce1f214777784549a350a8f9ba3b8: net/socket.c:1128:(.text+0x837): undefined reference to `wext_handle_ioctl'
net/socket.c:3397:(.text+0xa28): undefined reference to `compat_wext_handle_ioctl'
net/core/net-procfs.c:346:(.text+0x109): undefined reference to `wext_proc_exit'
net/core/net-procfs.c:330:(.text+0x1e4): undefined reference to `wext_proc_init'
minimized to 48 configs; suspects: [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 USB_SERIAL_FTDI_SIO 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 USB_XHCI_PCI_RENESAS WLAN WLAN_VENDOR_ATH WLAN_VENDOR_ATMEL WLAN_VENDOR_BROADCOM WLAN_VENDOR_INTERSIL WLAN_VENDOR_MARVELL WLAN_VENDOR_MEDIATEK WLAN_VENDOR_MICROCHIP WLAN_VENDOR_RALINK WLAN_VENDOR_REALTEK WLAN_VENDOR_RSI WLAN_VENDOR_ZYDAS ZEROPLUS_FF]
disabling configs for [kasan locking atomic_sleep hang memleak ubsan], they are not needed
testing current HEAD e8b14e1cefe8a3049a46a48685bf937ca244949d
testing commit e8b14e1cefe8a3049a46a48685bf937ca244949d gcc
compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44
kernel signature: ef17bd0c3dc522b145c43cb407a6d1f6e48e9a1a67923be269bf2d8b73e22cbe
run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc
run #1: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #2: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #3: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #4: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #5: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #6: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #7: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #8: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
run #9: crashed: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
representative crash: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow, types: [NULL-POINTER-DEREFERENCE]
crash still not fixed/happens on the oldest tested release
revisions tested: 7, total time: 1h15m39.011060447s (build: 36m8.449381522s, test: 38m1.598070818s)
crash still not fixed or there were kernel test errors
commit msg: Merge 5.10.250 into android13-5.10-lts
crash: BUG: unable to handle kernel NULL pointer dereference in __lookup_slow
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 11782f067 P4D 11782f067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP
CPU: 0 PID: 460 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc9000055bc58 EFLAGS: 00010206
RAX: ffffffff825edbc0 RBX: ffff88810e150680 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88810e15d1a0 RDI: ffff88810e25fb50
RBP: ffffc9000055bcb0 R08: ffff88810e150720 R09: ffff88810e150720
R10: 0000000000000000 R11: ffff8881171db8ec R12: ffff88810e15d1a0
R13: ffff88810e25fb50 R14: ffffc9000055bcc0 R15: 0000000000000000
FS:  00007fb2f9fee6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000117d82000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __lookup_slow+0x79/0x150 fs/namei.c:1648
 lookup_one_len+0x72/0x80 fs/namei.c:2664
 incfs_lookup_dentry.part.0+0x39/0x60 fs/incfs/data_mgmt.c:210
 incfs_lookup_dentry+0xe/0x20 fs/incfs/data_mgmt.c:201
 ioctl_create_file+0x3d7/0xcd0 fs/incfs/pseudo_files.c:555
 pending_reads_dispatch_ioctl+0xb5/0x940 fs/incfs/pseudo_files.c:1028
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x89/0xc0 fs/ioctl.c:739
 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fb2fa189ef9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb2f9fee028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb2fa3f4fa0 RCX: 00007fb2fa189ef9
RDX: 00002000000000c0 RSI: 00000000c058671e RDI: 0000000000000005
RBP: 00007fb2fa21eee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb2fa3f5038 R14: 00007fb2fa3f4fa0 R15: 00007ffdc040e158
Modules linked in:
CR2: 0000000000000000
---[ end trace 0275c4bd63db31bb ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc9000055bc58 EFLAGS: 00010206
RAX: ffffffff825edbc0 RBX: ffff88810e150680 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88810e15d1a0 RDI: ffff88810e25fb50
RBP: ffffc9000055bcb0 R08: ffff88810e150720 R09: ffff88810e150720
R10: 0000000000000000 R11: ffff8881171db8ec R12: ffff88810e15d1a0
R13: ffff88810e25fb50 R14: ffffc9000055bcc0 R15: 0000000000000000
FS:  00007fb2f9fee6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000117d82000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400