ci2 starts bisection 2026-01-06 09:36:44.881619312 +0000 UTC m=+3528417.058742379 bisecting fixing commit since 2ece552169c277a60a8b4ee62c478d6224db2db1 building syzkaller on 7e2882b32698b70f3149aee00c41e3d2d941dca3 ensuring issue is reproducible on original commit 2ece552169c277a60a8b4ee62c478d6224db2db1 testing commit 2ece552169c277a60a8b4ee62c478d6224db2db1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 04aa11017a9709ab69cac7d3f86d3f2db0cb9e5f1b069dd637ff9d8ded9dd50c all runs: crashed: general protection fault in fuse_atomic_open representative crash: general protection fault in fuse_atomic_open, types: [DoS] check whether we can drop unnecessary instrumentation disabling configs for [bug_or_warning kasan locking atomic_sleep hang memleak ubsan], they are not needed testing commit 2ece552169c277a60a8b4ee62c478d6224db2db1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 622f0dd35200c7f2f24f2a996449b08129d0ad3e9c66b8eaf33093192598ebdb all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in fuse_atomic_open representative crash: BUG: unable to handle kernel NULL pointer dereference in fuse_atomic_open, types: [NULL-POINTER-DEREFERENCE] the bug reproduces without the instrumentation disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], 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 [ubsan bug_or_warning kasan locking atomic_sleep hang memleak], they are not needed testing commit 2ece552169c277a60a8b4ee62c478d6224db2db1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: aca202a418c4ca05a45606a0407512cdde7c7c95a83b63ba116684ad77d9c6a1 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in fuse_atomic_open representative crash: BUG: unable to handle kernel NULL pointer dereference in fuse_atomic_open, types: [NULL-POINTER-DEREFERENCE] 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 2ece552169c277a60a8b4ee62c478d6224db2db1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: bf3e166cec3e7c2ff04b4456bde52911c1239b6f3608a97a946f92e18c279639 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in fuse_atomic_open representative crash: BUG: unable to handle kernel NULL pointer dereference in fuse_atomic_open, types: [NULL-POINTER-DEREFERENCE] 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 2ece552169c277a60a8b4ee62c478d6224db2db1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b38712371f9df9e1563708f32755e76fbfa4d20d2a757e151e0785a16e7b7449 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in fuse_atomic_open representative crash: BUG: unable to handle kernel NULL pointer dereference in fuse_atomic_open, types: [NULL-POINTER-DEREFERENCE] 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 2ece552169c277a60a8b4ee62c478d6224db2db1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e10c5926745b616417e29a52aeb9b492a8872b1fb91f9f174b3ba1694932cb67 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in fuse_atomic_open representative crash: BUG: unable to handle kernel NULL pointer dereference in fuse_atomic_open, types: [NULL-POINTER-DEREFERENCE] 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 2ece552169c277a60a8b4ee62c478d6224db2db1 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 failed building 2ece552169c277a60a8b4ee62c478d6224db2db1: net/socket.c:1128: undefined reference to `wext_handle_ioctl' net/socket.c:3397: undefined reference to `compat_wext_handle_ioctl' net/core/net-procfs.c:346: undefined reference to `wext_proc_exit' net/core/net-procfs.c:330: 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 [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed testing current HEAD e253c52bbdfce1f214777784549a350a8f9ba3b8 testing commit e253c52bbdfce1f214777784549a350a8f9ba3b8 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 5e35fbc24d312d3a2707ed443f56d9d700a624eafa4008ea0e7b583c5303973e all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in fuse_atomic_open representative crash: BUG: unable to handle kernel NULL pointer dereference in fuse_atomic_open, types: [NULL-POINTER-DEREFERENCE] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 1h33m7.751375916s (build: 1h3m18.87679021s, test: 28m8.975195584s) crash still not fixed or there were kernel test errors commit msg: Merge 5.10.247 into android13-5.10-lts crash: BUG: unable to handle kernel NULL pointer dereference in fuse_atomic_open BUG: kernel NULL pointer dereference, address: 0000000000000047 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 1169de067 P4D 1169de067 PUD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 0 PID: 458 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:fuse_atomic_open+0x4e/0x130 fs/fuse/dir.c:853 Code: 00 48 85 db 74 03 48 8b 1b 49 8b 85 50 03 00 00 a8 08 0f 85 d7 00 00 00 45 31 ff 41 f7 04 24 00 00 00 10 75 6d f6 c1 40 74 08 <49> 83 7c 24 30 00 74 1a 4c 89 fe 4c 89 f7 e8 8f f4 ea ff 48 83 c4 RSP: 0018:ffffc9000073fc90 EFLAGS: 00010202 RAX: 0000000000000017 RBX: ffff888116a26c00 RCX: 0000000000008241 RDX: ffff88811869a500 RSI: 0000000000000001 RDI: ffff88810d146758 RBP: ffffc9000073fcc0 R08: 0000000000008000 R09: ffff888118648a90 R10: ffff88810b1a8b20 R11: 0000000000000000 R12: 0000000000000017 R13: ffff88810d146400 R14: ffff888109230dc0 R15: 0000000000000017 FS: 00007f96b131d6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000047 CR3: 00000001169cf000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: atomic_open fs/namei.c:3122 [inline] lookup_open fs/namei.c:3227 [inline] open_last_lookups fs/namei.c:3325 [inline] path_openat+0x6d2/0x10d0 fs/namei.c:3514 do_filp_open+0x9d/0x140 fs/namei.c:3544 do_sys_openat2+0x9c/0x210 fs/open.c:1219 do_sys_open fs/open.c:1235 [inline] __do_sys_creat fs/open.c:1311 [inline] __se_sys_creat fs/open.c:1305 [inline] __x64_sys_creat+0x46/0x60 fs/open.c:1305 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f96b14cdec9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f96b131d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f96b1725090 RCX: 00007f96b14cdec9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000180 RBP: 00007f96b1550f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f96b1725128 R14: 00007f96b1725090 R15: 00007ffee86fb128 Modules linked in: CR2: 0000000000000047 ---[ end trace c0d99943679a0763 ]--- RIP: 0010:fuse_atomic_open+0x4e/0x130 fs/fuse/dir.c:853 Code: 00 48 85 db 74 03 48 8b 1b 49 8b 85 50 03 00 00 a8 08 0f 85 d7 00 00 00 45 31 ff 41 f7 04 24 00 00 00 10 75 6d f6 c1 40 74 08 <49> 83 7c 24 30 00 74 1a 4c 89 fe 4c 89 f7 e8 8f f4 ea ff 48 83 c4 RSP: 0018:ffffc9000073fc90 EFLAGS: 00010202 RAX: 0000000000000017 RBX: ffff888116a26c00 RCX: 0000000000008241 RDX: ffff88811869a500 RSI: 0000000000000001 RDI: ffff88810d146758 RBP: ffffc9000073fcc0 R08: 0000000000008000 R09: ffff888118648a90 R10: ffff88810b1a8b20 R11: 0000000000000000 R12: 0000000000000017 R13: ffff88810d146400 R14: ffff888109230dc0 R15: 0000000000000017 FS: 00007f96b131d6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000047 CR3: 00000001169cf000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 48 85 add %cl,-0x7b(%rax) 3: db 74 03 48 (bad) 0x48(%rbx,%rax,1) 7: 8b 1b mov (%rbx),%ebx 9: 49 8b 85 50 03 00 00 mov 0x350(%r13),%rax 10: a8 08 test $0x8,%al 12: 0f 85 d7 00 00 00 jne 0xef 18: 45 31 ff xor %r15d,%r15d 1b: 41 f7 04 24 00 00 00 testl $0x10000000,(%r12) 22: 10 23: 75 6d jne 0x92 25: f6 c1 40 test $0x40,%cl 28: 74 08 je 0x32 * 2a: 49 83 7c 24 30 00 cmpq $0x0,0x30(%r12) <-- trapping instruction 30: 74 1a je 0x4c 32: 4c 89 fe mov %r15,%rsi 35: 4c 89 f7 mov %r14,%rdi 38: e8 8f f4 ea ff call 0xffeaf4cc 3d: 48 rex.W 3e: 83 .byte 0x83 3f: c4 .byte 0xc4