ci2 starts bisection 2026-03-23 22:47:15.041763884 +0000 UTC m=+40038.103084809 bisecting fixing commit since 58c592510fcd5577e655b9aca5c018b1af4ae229 building syzkaller on 4c131dc4b96f069f4177bf6cdd08431aaf9add88 ensuring issue is reproducible on original commit 58c592510fcd5577e655b9aca5c018b1af4ae229 testing commit 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 4a4ede2f81b58970325d01cbfdc22e33e5081b2f785efe3481224ad9256555f5 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 [bug_or_warning kasan locking atomic_sleep hang memleak ubsan], they are not needed testing commit 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 6c64c3d3d9a9f4d5a2377400f16539cda7d5da7004568f664d48f5a6f57ac72a 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 [atomic_sleep hang memleak ubsan bug_or_warning kasan locking], they are not needed kconfig minimization: base=4788 full=6025 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 [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed testing commit 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 771013f88f5aa532e21607293f3fedd7c9d3838c2897a451a0b45539766ff0e1 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 [bug_or_warning kasan locking atomic_sleep hang memleak ubsan], they are not needed testing commit 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 688c76016380fc9030cc64a188d2958d689e3be7093f071578aaf74ea0744b5c 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 [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 9c8e2d378c780b2bcd3e51882f658c98be19bc08e09a1f414c3d9b2a55dd79f9 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 [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing commit 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 7717ff7bc86b5cb28df38df8d6a0063fe04b9be14e7dc55a92ec65a92f8f48a0 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 [memleak ubsan bug_or_warning kasan locking atomic_sleep hang], they are not needed testing commit 58c592510fcd5577e655b9aca5c018b1af4ae229 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 failed building 58c592510fcd5577e655b9aca5c018b1af4ae229: net/socket.c:1128:(.text+0x817): undefined reference to `wext_handle_ioctl' net/socket.c:3397:(.text+0xa08): 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 [hang memleak ubsan bug_or_warning kasan locking atomic_sleep], they are not needed testing current HEAD 9136079e403ad15ed26ea110e148d3555a295f84 testing commit 9136079e403ad15ed26ea110e148d3555a295f84 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.44 kernel signature: 5b804392246fbab054153b31bc8109052725e8159aa21a5f6abb4d73b91686da 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: 1h27m32.106939945s (build: 38m19.838684295s, test: 47m53.924177764s) crash still not fixed or there were kernel test errors commit msg: Revert "rpmsg: core: fix race in driver_override_show() and use core helper" 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 118f09067 P4D 118f09067 PUD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 0 PID: 462 Comm: syz.2.18 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:mnt_want_write+0xa/0xd0 fs/namespace.c:363 Code: 44 89 e0 41 5c 5d c3 48 8b 43 08 f6 40 50 01 75 cb eb d7 e8 47 39 c9 ff 5b 44 89 e0 41 5c 5d c3 55 48 89 e5 41 54 53 48 89 fb <4c> 8b 67 08 bf 01 00 00 00 e8 78 36 e0 ff 41 8b 84 24 a8 02 00 00 RSP: 0018:ffffc9000078fcd0 EFLAGS: 00010246 RAX: ffff88810c959540 RBX: 0000000000000000 RCX: 0000000000000360 RDX: ffff888100dfc300 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000078fce0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88810e5b2410 R13: ffff88810e5b2410 R14: 0000000000000000 R15: ffffc9000078fe50 FS: 00007fe38ff6b6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 0000000118efd000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ovl_want_write+0x1b/0x20 fs/overlayfs/util.c:21 ovl_setattr+0x37/0x1c0 fs/overlayfs/inode.c:28 notify_change+0x339/0x490 fs/attr.c:410 incfs_setattr+0x98/0x100 fs/incfs/vfs.c:1664 notify_change+0x339/0x490 fs/attr.c:410 chmod_common+0x89/0x150 fs/open.c:584 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 do_syscall_64+0x32/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fe390106eb9 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:00007fe38ff6b028 EFLAGS: 00000246 ORIG_RAX: 000000000000005a RAX: ffffffffffffffda RBX: 00007fe390381fa0 RCX: 00007fe390106eb9 RDX: 0000000000000000 RSI: 0000000000000054 RDI: 0000200000000000 RBP: 00007fe390174c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe390382038 R14: 00007fe390381fa0 R15: 00007fffea895778 Modules linked in: CR2: 0000000000000008 ---[ end trace aa4169b004879f6e ]--- RIP: 0010:mnt_want_write+0xa/0xd0 fs/namespace.c:363 Code: 44 89 e0 41 5c 5d c3 48 8b 43 08 f6 40 50 01 75 cb eb d7 e8 47 39 c9 ff 5b 44 89 e0 41 5c 5d c3 55 48 89 e5 41 54 53 48 89 fb <4c> 8b 67 08 bf 01 00 00 00 e8 78 36 e0 ff 41 8b 84 24 a8 02 00 00 RSP: 0018:ffffc9000078fcd0 EFLAGS: 00010246 RAX: ffff88810c959540 RBX: 0000000000000000 RCX: 0000000000000360 RDX: ffff888100dfc300 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000078fce0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88810e5b2410 R13: ffff88810e5b2410 R14: 0000000000000000 R15: ffffc9000078fe50 FS: 00007fe38ff6b6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 0000000118efd000 CR4: 00000000003506b0 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 47 39 c9 ff call 0xffc9395f 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: bf 01 00 00 00 mov $0x1,%edi 33: e8 78 36 e0 ff call 0xffe036b0 38: 41 8b 84 24 a8 02 00 mov 0x2a8(%r12),%eax 3f: 00