ci2 starts bisection 2026-10-02 19:56:31.423193335 +0000 UTC m=+9209.006520695 bisecting fixing commit since 05eea940894a0a7e5c1f6e91dff5b64bdbe45b31 building syzkaller on 223544dc3097d6233a385835bc8dba2b716cc5f0 ensuring issue is reproducible on original commit 05eea940894a0a7e5c1f6e91dff5b64bdbe45b31 testing commit 05eea940894a0a7e5c1f6e91dff5b64bdbe45b31 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 5f7bba5eb9adc578eaf9c7eff96d8a88ace06cfe7dad11075bac0c74d7be4b56 all runs: crashed: general protection fault in mnt_want_write representative crash: general protection fault in mnt_want_write, types: [DoS] 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 05eea940894a0a7e5c1f6e91dff5b64bdbe45b31 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 0dfab1c112d17ae6629555e75154e06f14ec5245f029e20203aea0ed2aa31d4d all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in mnt_want_write representative crash: BUG: unable to handle kernel NULL pointer dereference in mnt_want_write, types: [NULL-POINTER-DEREFERENCE] 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=4921 full=6218 leaves diff=256 split chunks (needed=false): <256> split chunk #0 of len 256 into 5 parts testing without sub-chunk 1/5 disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed testing commit 05eea940894a0a7e5c1f6e91dff5b64bdbe45b31 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 5cbbf1cf9390f5ffe9da266447a512ada64f345b30b73005583089c64b4e5dc7 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in mnt_want_write representative crash: BUG: unable to handle kernel NULL pointer dereference in mnt_want_write, 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 05eea940894a0a7e5c1f6e91dff5b64bdbe45b31 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 94c8875207793704f057ccb0d0e34c12084f9aa4f02cf1d8261dc4b3f7db9c0b all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in mnt_want_write representative crash: BUG: unable to handle kernel NULL pointer dereference in mnt_want_write, types: [NULL-POINTER-DEREFERENCE] 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 05eea940894a0a7e5c1f6e91dff5b64bdbe45b31 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 0d96d76ba7eb3286b1b06dfc72ea7ff23236ba9272048506cc1f353554ce3c38 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in mnt_want_write representative crash: BUG: unable to handle kernel NULL pointer dereference in mnt_want_write, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [locking atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit 05eea940894a0a7e5c1f6e91dff5b64bdbe45b31 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 053792c730423b71fdaee97521bfc6bd251af2e8bd1fcbcd6385b7f4a161b158 all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in mnt_want_write representative crash: BUG: unable to handle kernel NULL pointer dereference in mnt_want_write, types: [NULL-POINTER-DEREFERENCE] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit 05eea940894a0a7e5c1f6e91dff5b64bdbe45b31 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building 05eea940894a0a7e5c1f6e91dff5b64bdbe45b31: net/socket.c:1188:(.text+0x210b): undefined reference to `wext_handle_ioctl' net/socket.c:3389:(.text+0x235f): undefined reference to `compat_wext_handle_ioctl' net/core/net-procfs.c:343:(.text+0x109): undefined reference to `wext_proc_exit' net/core/net-procfs.c:327:(.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 [bug_or_warning kasan locking atomic_sleep hang memleak ubsan], they are not needed testing current HEAD f5eaed2bbe33b10b297b366bb5d02819356b5c13 testing commit f5eaed2bbe33b10b297b366bb5d02819356b5c13 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: d52a541ca1082bcc7388eab1577e2d70973a5fed99cefe6c4b45247fdba1c2cc all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in mnt_want_write representative crash: BUG: unable to handle kernel NULL pointer dereference in mnt_want_write, types: [NULL-POINTER-DEREFERENCE] crash still not fixed/happens on the oldest tested release revisions tested: 7, total time: 1h34m6.001482009s (build: 15m6.531737059s, test: 59m31.677575683s) crash still not fixed or there were kernel test errors commit msg: Merge 9f30ba9aa027 ("tcp: clear sock_ops cb flags before force-closing a child socket") into android13-5.15-lts crash: BUG: unable to handle kernel NULL pointer dereference in mnt_want_write incfs: Can't find or create .incomplete dir in ./file0 incfs: mount failed -22 incfs: ino conflict with backing FS 2 BUG: kernel NULL pointer dereference, address: 0000000000000008 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 115c36067 P4D 115c36067 PUD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 1 PID: 454 Comm: syz.2.18 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:mnt_want_write+0xa/0x110 fs/namespace.c:387 Code: 44 89 e0 41 5c 5d c3 48 8b 43 08 f6 40 50 01 75 cb eb d7 e8 c7 1d c6 ff 5b 44 89 e0 41 5c 5d c3 55 48 89 e5 41 54 53 48 89 fb <4c> 8b 67 08 2e 2e 2e 31 c0 bf 01 00 00 00 e8 c3 1c de ff 41 8b 84 RSP: 0018:ffffc900003bbc90 EFLAGS: 00010246 RAX: ffff8881143c0f00 RBX: 0000000000000000 RCX: 0000000000000080 RDX: 0000000000000000 RSI: ffff88810b7f4da0 RDI: 0000000000000000 RBP: ffffc900003bbca0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000084 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88810b765410 R14: ffffc900003bbe40 R15: ffffc900003bbe40 FS: 00007fa93c6d56c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 0000000115c2b000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ovl_want_write+0x1b/0x20 fs/overlayfs/util.c:22 ovl_setattr+0x3e/0x150 fs/overlayfs/inode.c:32 notify_change+0x1f8/0x500 fs/attr.c:505 incfs_setattr+0xaa/0x120 fs/incfs/vfs.c:1682 notify_change+0x1f8/0x500 fs/attr.c:505 chmod_common+0x90/0x150 fs/open.c:583 do_fchmodat+0x5d/0xb0 fs/open.c:622 __do_sys_chmod fs/open.c:640 [inline] __se_sys_chmod fs/open.c:638 [inline] __x64_sys_chmod+0x16/0x20 fs/open.c:638 x64_sys_call+0x70c/0x990 arch/x86/include/generated/asm/syscalls_64.h:91 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x33/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fa93c872e59 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:00007fa93c6d5028 EFLAGS: 00000246 ORIG_RAX: 000000000000005a RAX: ffffffffffffffda RBX: 00007fa93caebfa0 RCX: 00007fa93c872e59 RDX: 0000000000000000 RSI: 0000000000000054 RDI: 0000200000000000 RBP: 00007fa93c908d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa93caec038 R14: 00007fa93caebfa0 R15: 00007ffe4425cbe8 Modules linked in: CR2: 0000000000000008 ---[ end trace 3c648ad2eff00522 ]--- RIP: 0010:mnt_want_write+0xa/0x110 fs/namespace.c:387 Code: 44 89 e0 41 5c 5d c3 48 8b 43 08 f6 40 50 01 75 cb eb d7 e8 c7 1d c6 ff 5b 44 89 e0 41 5c 5d c3 55 48 89 e5 41 54 53 48 89 fb <4c> 8b 67 08 2e 2e 2e 31 c0 bf 01 00 00 00 e8 c3 1c de ff 41 8b 84 RSP: 0018:ffffc900003bbc90 EFLAGS: 00010246 RAX: ffff8881143c0f00 RBX: 0000000000000000 RCX: 0000000000000080 RDX: 0000000000000000 RSI: ffff88810b7f4da0 RDI: 0000000000000000 RBP: ffffc900003bbca0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000084 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88810b765410 R14: ffffc900003bbe40 R15: ffffc900003bbe40 FS: 00007fa93c6d56c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 0000000115c2b000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 44 89 e0 mov %r12d,%eax 3: 41 5c pop %r12 5: 5d pop %rbp 6: c3 ret 7: 48 8b 43 08 mov 0x8(%rbx),%rax b: f6 40 50 01 testb $0x1,0x50(%rax) f: 75 cb jne 0xffffffdc 11: eb d7 jmp 0xffffffea 13: e8 c7 1d c6 ff call 0xffc61ddf 18: 5b pop %rbx 19: 44 89 e0 mov %r12d,%eax 1c: 41 5c pop %r12 1e: 5d pop %rbp 1f: c3 ret 20: 55 push %rbp 21: 48 89 e5 mov %rsp,%rbp 24: 41 54 push %r12 26: 53 push %rbx 27: 48 89 fb mov %rdi,%rbx * 2a: 4c 8b 67 08 mov 0x8(%rdi),%r12 <-- trapping instruction 2e: 2e 2e 2e 31 c0 cs cs cs xor %eax,%eax 33: bf 01 00 00 00 mov $0x1,%edi 38: e8 c3 1c de ff call 0xffde1d00 3d: 41 rex.B 3e: 8b .byte 0x8b 3f: 84 .byte 0x84