8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8504d003, *pmd=feca9003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 6263 Comm: syz-executor.0 Not tainted 6.9.0-rc7-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 : [<8047a5fc>] lr : [<807ea4ec>] psr: 60000013 sp : dfe4dca0 ip : dfe4dcb0 fp : dfe4dcac r10: 00000018 r9 : 8285a4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 87620800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 838f8dc0 DAC: 00000000 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 87620800 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 0xdfe4c000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfe4c000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Process syz-executor.0 (pid: 6263, stack limit = 0xdfe4c000) Stack: (0xdfe4dca0 to 0xdfe4e000) dca0: dfe4dce4 dfe4dcb0 807ea4ec 8047a5fc dfe4dcd4 dfe4df48 8024cc38 87620800 dcc0: 87620800 00000000 00000001 00000000 000000c7 00000018 dfe4dd34 dfe4dce8 dce0: 81434ddc 807ea400 00000000 35114db7 85335600 853356d0 82f9b000 853356d8 dd00: dfe4df48 00000002 dfe4dd8c 82f9b000 000000c7 85335600 83646000 00000000 dd20: 00000102 00000000 dfe4dda4 dfe4dd38 81657d24 81434cf8 00000102 00000000 dd40: 00000000 00000000 00000000 00000000 82f9b088 853356ec 82f9b234 dfe4df38 dd60: 00000000 35114db7 818c5320 821a9848 00000102 35114db7 dfe4df38 81657bd4 dd80: dfe4df38 84c74500 00000102 00000000 00000102 dfe4ddf4 dfe4ddc4 dfe4dda8 dda0: 81656da0 81657be0 00000000 00000102 00000000 81656d68 dfe4dde4 dfe4ddc8 ddc0: 813a434c 81656d74 dfe4df38 84c74500 200004c0 00000000 dfe4dea4 dfe4dde8 dde0: 813a454c 813a4308 00000000 00000000 00000001 00000000 00000000 00000000 de00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de60: 00000000 00000000 00000000 00000000 00000000 35114db7 00000000 00000000 de80: dfe4df38 200004c0 00000102 84c74500 83646000 00000129 dfe4df24 dfe4dea8 dea0: 813a7490 813a44c8 00000102 00000000 00000008 00000000 00000000 200002c0 dec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 35114db7 df00: dfe4df24 84c74500 00000000 200004c0 00000102 80200288 dfe4dfa4 dfe4df28 df20: 813a7c0c 813a7414 00000000 dfe4df38 00000001 fffffff7 dfe4ddf4 00000000 df40: 00000000 00000000 00000000 00000001 200002c0 000000c6 00000001 00000000 df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 df80: 8020c60c 35114db7 00000000 00000000 0014c2c8 00000129 00000000 dfe4dfa8 dfa0: 80200060 813a7ba4 00000000 00000000 00000003 200004c0 00000102 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7eddd32e 7eddd32f 003d0f00 76bc30fc dfe0: 76bc2f08 76bc2ef8 00016bb0 00050c70 60000010 00000003 00000000 00000000 Call trace: [<8047a5f0>] (__kmap_local_page_prot) from [<807ea4ec>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8047a5f0>] (__kmap_local_page_prot) from [<807ea4ec>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807ea3f4>] (copy_page_to_iter) from [<81434ddc>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000001 r6:00000000 r5:87620800 r4:87620800 [<81434cec>] (sk_msg_recvmsg) from [<81657d24>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81434cec>] (sk_msg_recvmsg) from [<81657d24>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:83646000 r6:85335600 r5:000000c7 r4:82f9b000 [<81657bd4>] (unix_bpf_recvmsg) from [<81656da0>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfe4ddf4 r9:00000102 r8:00000000 r7:00000102 r6:84c74500 r5:dfe4df38 r4:81657bd4 [<81656d68>] (unix_dgram_recvmsg) from [<813a434c>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81656d68>] (unix_dgram_recvmsg) from [<813a434c>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81656d68 [<813a42fc>] (sock_recvmsg) from [<813a454c>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200004c0 r5:84c74500 r4:dfe4df38 [<813a44bc>] (____sys_recvmsg) from [<813a7490>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:83646000 r8:84c74500 r7:00000102 r6:200004c0 r5:dfe4df38 r4:00000000 [<813a7408>] (___sys_recvmsg) from [<813a7c0c>] (__sys_recvmsg net/socket.c:2875 [inline]) [<813a7408>] (___sys_recvmsg) from [<813a7c0c>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<813a7408>] (___sys_recvmsg) from [<813a7c0c>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000102 r6:200004c0 r5:00000000 r4:84c74500 [<813a7b98>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfe4dfa8 to 0xdfe4dff0) dfa0: 00000000 00000000 00000003 200004c0 00000102 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7eddd32e 7eddd32f 003d0f00 76bc30fc dfe0: 76bc2f08 76bc2ef8 00016bb0 00050c70 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