8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85196003, *pmd=fecbd003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 4322 Comm: syz-executor.1 Not tainted 6.9.0-rc6-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1100 [inline] PC is at __kmap_local_page_prot+0xc/0x74 mm/highmem.c:573 LR is at kmap_local_page include/linux/highmem-internal.h:73 [inline] LR is at copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360 pc : [<8047a26c>] lr : [<807e9d04>] psr: 60000013 sp : dfda1ca0 ip : dfda1cb0 fp : dfda1cac r10: 00000018 r9 : 8285a4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84d87c00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 851886c0 DAC: fffffffd Register r0 information: NULL pointer Register r1 information: NULL pointer Register r2 information: non-paged memory Register r3 information: non-paged memory Register r4 information: slab kmalloc-1k start 84d87c00 pointer offset 0 size 1024 Register r5 information: NULL pointer Register r6 information: NULL pointer Register r7 information: NULL pointer Register r8 information: NULL pointer Register r9 information: non-slab/vmalloc memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfda0000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfda0000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Process syz-executor.1 (pid: 4322, stack limit = 0xdfda0000) Stack: (0xdfda1ca0 to 0xdfda2000) 1ca0: dfda1ce4 dfda1cb0 807e9d04 8047a26c dfda1cd4 dfda1f48 8024c860 84d87c00 1cc0: 84d87c00 00000000 00000000 00000000 000000c7 00000018 dfda1d34 dfda1ce8 1ce0: 81433d5c 807e9c18 00000000 b92e0756 847a7000 847a70d0 83405b00 847a70d8 1d00: dfda1f48 00000000 dfda1d8c 83405b00 000000c7 847a7000 84791800 00000000 1d20: 00000000 00000000 dfda1da4 dfda1d38 81656a68 81433c78 00000000 00000000 1d40: 00000000 00000000 00000000 00000000 83405b88 847a70ec 83405d34 dfda1f38 1d60: 00000000 b92e0756 818c3da0 821a9848 00000000 b92e0756 dfda1f38 81656918 1d80: dfda1f38 833e8c80 00000000 00000000 00000000 dfda1df4 dfda1dc4 dfda1da8 1da0: 81655ae4 81656924 00000000 00000000 00000000 81655aac dfda1de4 dfda1dc8 1dc0: 813a33ac 81655ab8 dfda1f38 833e8c80 200004c0 00000000 dfda1ea4 dfda1de8 1de0: 813a35ac 813a3368 00000000 00000000 00000001 00000000 00000000 00000000 1e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e60: 00000000 00000000 00000000 00000000 00000000 b92e0756 00000000 00000000 1e80: dfda1f38 200004c0 00000000 833e8c80 84791800 00000129 dfda1f24 dfda1ea8 1ea0: 813a64f0 813a3528 00000000 00000000 00000008 00000000 00000000 200002c0 1ec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 b92e0756 1f00: dfda1f24 833e8c80 00000000 200004c0 00000000 80200288 dfda1fa4 dfda1f28 1f20: 813a6c6c 813a6474 00000000 dfda1f38 00000001 fffffff7 dfda1df4 00000000 1f40: 00000000 00000000 00000000 00000000 200002c0 000000c7 00000001 00000000 1f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 1f80: 8020ca6c b92e0756 00000000 00000000 0014c2c8 00000129 00000000 dfda1fa8 1fa0: 80200060 813a6c04 00000000 00000000 00000003 200004c0 00000000 00000000 1fc0: 00000000 00000000 0014c2c8 00000129 7ebed32e 7ebed32f 003d0f00 76bfd0fc 1fe0: 76bfcf08 76bfcef8 00016ab0 00050bf0 60000010 00000003 00000000 00000000 Call trace: [<8047a260>] (__kmap_local_page_prot) from [<807e9d04>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8047a260>] (__kmap_local_page_prot) from [<807e9d04>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807e9c0c>] (copy_page_to_iter) from [<81433d5c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000000 r6:00000000 r5:84d87c00 r4:84d87c00 [<81433c6c>] (sk_msg_recvmsg) from [<81656a68>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81433c6c>] (sk_msg_recvmsg) from [<81656a68>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:84791800 r6:847a7000 r5:000000c7 r4:83405b00 [<81656918>] (unix_bpf_recvmsg) from [<81655ae4>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfda1df4 r9:00000000 r8:00000000 r7:00000000 r6:833e8c80 r5:dfda1f38 r4:81656918 [<81655aac>] (unix_dgram_recvmsg) from [<813a33ac>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81655aac>] (unix_dgram_recvmsg) from [<813a33ac>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81655aac [<813a335c>] (sock_recvmsg) from [<813a35ac>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200004c0 r5:833e8c80 r4:dfda1f38 [<813a351c>] (____sys_recvmsg) from [<813a64f0>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:84791800 r8:833e8c80 r7:00000000 r6:200004c0 r5:dfda1f38 r4:00000000 [<813a6468>] (___sys_recvmsg) from [<813a6c6c>] (__sys_recvmsg net/socket.c:2875 [inline]) [<813a6468>] (___sys_recvmsg) from [<813a6c6c>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<813a6468>] (___sys_recvmsg) from [<813a6c6c>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:200004c0 r5:00000000 r4:833e8c80 [<813a6bf8>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfda1fa8 to 0xdfda1ff0) 1fa0: 00000000 00000000 00000003 200004c0 00000000 00000000 1fc0: 00000000 00000000 0014c2c8 00000129 7ebed32e 7ebed32f 003d0f00 76bfd0fc 1fe0: 76bfcf08 76bfcef8 00016ab0 00050bf0 r7:00000129 r6:0014c2c8 r5:00000000 r4:00000000 Code: eaffffe8 e1a0c00d e92dd800 e24cb004 (e5901000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: eaffffe8 b 0xffffffa8 4: e1a0c00d mov ip, sp 8: e92dd800 push {fp, ip, lr, pc} c: e24cb004 sub fp, ip, #4 * 10: e5901000 ldr r1, [r0] <-- trapping instruction