Hello, syzbot found the following issue on: HEAD commit: 51835949dda3 Merge tag 'net-next-6.11' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1325e60d980000 kernel config: https://syzkaller.appspot.com/x/.config?x=c1c1b0a8065e216 dashboard link: https://syzkaller.appspot.com/bug?extid=34a0ee986f61f15da35d compiler: arm-linux-gnueabi-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11bd9a5e980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15726e95980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/8ead8862021c/non_bootable_disk-51835949.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a129ae4ab997/vmlinux-51835949.xz kernel image: https://storage.googleapis.com/syzbot-assets/9339fe082652/zImage-51835949.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+34a0ee986f61f15da35d@xxxxxxxxxxxxxxxxxxxxxxxxx 8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000008 when read [00000008] *pgd=844c0003, *pmd=fe12e003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 3011 Comm: syz-executor103 Not tainted 6.10.0-syzkaller #0 Hardware name: ARM-Versatile Express PC is at path_from_stashed+0x1c/0x308 fs/libfs.c:2204 LR is at open_namespace+0x44/0xbc fs/nsfs.c:102 pc : [<8053af54>] lr : [<8054d6f8>] psr: 80000013 sp : df959e80 ip : 84183000 fp : df959ec4 r10: 84183000 r9 : 00000003 r8 : 843f3300 r7 : 82caa250 r6 : 84183000 r5 : 00000000 r4 : 82625878 r3 : df959ecc r2 : 00000008 r1 : 82c95800 r0 : 00000008 Flags: Nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 843f1a00 DAC: fffffffd Register r0 information: non-paged memory Register r1 information: slab kmalloc-1k start 82c95800 pointer offset 0 size 1024 Register r2 information: non-paged memory Register r3 information: 2-page vmalloc region starting at 0xdf958000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2780 Register r4 information: non-slab/vmalloc memory Register r5 information: NULL pointer Register r6 information: slab task_struct start 84183000 pointer offset 0 size 3072 Register r7 information: slab mnt_cache start 82caa240 pointer offset 16 size 184 Register r8 information: slab filp start 843f3300 pointer offset 0 size 160 Register r9 information: non-paged memory Register r10 information: slab task_struct start 84183000 pointer offset 0 size 3072 Register r11 information: 2-page vmalloc region starting at 0xdf958000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2780 Register r12 information: slab task_struct start 84183000 pointer offset 0 size 3072 Process syz-executor103 (pid: 3011, stack limit = 0xdf958000) Stack: (0xdf959e80 to 0xdf95a000) 9e80: 841b2400 00000008 df959eb4 df959e98 806e6544 804065ac 00000009 82625878 9ea0: 00000000 84183000 841b2c80 843f3300 00000003 84183000 df959ef4 df959ec8 9ec0: 8054d6f8 8053af44 df959ef4 00000000 00000000 f9244696 82625878 82625878 9ee0: 841b2400 00000008 df959f14 df959ef8 8055271c 8054d6c0 0000ff07 00000000 9f00: 843f3300 00000000 df959fa4 df959f18 8051a7f0 805525a4 000001b2 8020029c 9f20: 84183000 000001b2 df959fac df959f38 8020ba70 8042c724 83f01500 df959f80 9f40: 00000000 843f3300 00000003 82cb0800 df959f7c df959f60 805283b8 8027aebc 9f60: 83f01500 00000003 83f01500 00000003 df959fa4 f9244696 8026b8b0 00000000 9f80: 00000000 0008e058 00000036 8020029c 84183000 00000036 00000000 df959fa8 9fa0: 80200060 8051a6c8 00000000 00000000 00000003 0000ff07 00000000 00000000 9fc0: 00000000 00000000 0008e058 00000036 7ee54e0c 00000000 00000001 00000000 9fe0: 7ee54c70 7ee54c60 0001064c 0002e7a0 00000010 00000003 00000000 00000000 Call trace: [<8053af38>] (path_from_stashed) from [<8054d6f8>] (open_namespace+0x44/0xbc fs/nsfs.c:102) r10:84183000 r9:00000003 r8:843f3300 r7:841b2c80 r6:84183000 r5:00000000 r4:82625878 [<8054d6b4>] (open_namespace) from [<8055271c>] (pidfd_ioctl+0x184/0x4c4 fs/pidfs.c:196) r6:00000008 r5:841b2400 r4:82625878 [<80552598>] (pidfd_ioctl) from [<8051a7f0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<80552598>] (pidfd_ioctl) from [<8051a7f0>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<80552598>] (pidfd_ioctl) from [<8051a7f0>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<80552598>] (pidfd_ioctl) from [<8051a7f0>] (sys_ioctl+0x134/0xda4 fs/ioctl.c:893) r7:00000000 r6:843f3300 r5:00000000 r4:0000ff07 [<8051a6bc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf959fa8 to 0xdf959ff0) 9fa0: 00000000 00000000 00000003 0000ff07 00000000 00000000 9fc0: 00000000 00000000 0008e058 00000036 7ee54e0c 00000000 00000001 00000000 9fe0: 7ee54c70 7ee54c60 0001064c 0002e7a0 r10:00000036 r9:84183000 r8:8020029c r7:00000036 r6:0008e058 r5:00000000 r4:00000000 Code: e24dd01c e1a07001 e5911004 ee1dcf70 (e5905000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e24dd01c sub sp, sp, #28 4: e1a07001 mov r7, r1 8: e5911004 ldr r1, [r1, #4] c: ee1dcf70 mrc 15, 0, ip, cr13, cr0, {3} * 10: e5905000 ldr r5, [r0] <-- trapping instruction --- This report is generated by a bot. 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