8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85003003, *pmd=fbc8a003 Internal error: Oops: 205 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 3789 Comm: syz-executor.0 Not tainted 6.10.0-rc4-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1103 [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 : [<80480f60>] lr : [<8080692c>] psr: 60000013 sp : e0a21ca0 ip : e0a21cb0 fp : e0a21cac r10: 00000018 r9 : 8285f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 850a8400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84fbbbc0 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 850a8400 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 0xe0a20000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xe0a20000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797 Process syz-executor.0 (pid: 3789, stack limit = 0xe0a20000) Stack: (0xe0a21ca0 to 0xe0a22000) 1ca0: e0a21ce4 e0a21cb0 8080692c 80480f60 e0a21cd4 e0a21f48 8024d2c4 850a8400 1cc0: 850a8400 00000000 00000001 00000000 000000c7 00000018 e0a21d34 e0a21ce8 1ce0: 81461a20 80806840 00000000 014c4e93 84159200 841592e0 83623300 841592e8 1d00: e0a21f48 00000002 e0a21d8c 83623300 000000c7 84159200 840d4800 00000000 1d20: 00000102 00000000 e0a21da4 e0a21d38 816892a4 8146193c 00000102 00000000 1d40: 00000000 00000000 00000000 00000000 83623388 841592fc 83623534 e0a21f38 1d60: 00000000 014c4e93 8260ca7c 821cb998 00000102 014c4e93 e0a21f38 81689154 1d80: e0a21f38 8481b680 00000102 00000000 00000102 e0a21df4 e0a21dc4 e0a21da8 1da0: 81687fec 81689160 00000000 00000102 00000000 81687fb4 e0a21de4 e0a21dc8 1dc0: 813d0bd4 81687fc0 e0a21f38 200004c0 8481b680 00000000 e0a21ea4 e0a21de8 1de0: 813d0dd8 813d0b90 00000001 00000000 e0a21e34 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 014c4e93 00000000 00000000 1e80: e0a21f38 200004c0 00000102 8481b680 840d4800 00000129 e0a21f24 e0a21ea8 1ea0: 813d3ebc 813d0d54 00000102 00000000 80287344 00000000 00000000 200002c0 1ec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 014c4e93 1f00: e0a21f24 8481b680 00000000 200004c0 00000102 8020029c e0a21fa4 e0a21f28 1f20: 813d469c 813d3e40 00000000 e0a21f38 00000001 fffffff7 e0a21df4 00000000 1f40: 00000000 00000000 00000000 00000001 200002c0 000000c6 00000001 00000000 1f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 1f80: 8020c910 014c4e93 00000000 00000000 001542c8 00000129 00000000 e0a21fa8 1fa0: 80200060 813d4634 00000000 00000000 00000003 200004c0 00000102 00000000 1fc0: 00000000 00000000 001542c8 00000129 7ef65336 7ef65337 003d0f00 76b440fc 1fe0: 76b43f08 76b43ef8 00016f30 000516d0 60000010 00000003 00000000 00000000 Call trace: [<80480f54>] (__kmap_local_page_prot) from [<8080692c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80480f54>] (__kmap_local_page_prot) from [<8080692c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<80806834>] (copy_page_to_iter) from [<81461a20>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000c7 r8:00000000 r7:00000001 r6:00000000 r5:850a8400 r4:850a8400 [<81461930>] (sk_msg_recvmsg) from [<816892a4>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<81461930>] (sk_msg_recvmsg) from [<816892a4>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:840d4800 r6:84159200 r5:000000c7 r4:83623300 [<81689154>] (unix_bpf_recvmsg) from [<81687fec>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2488) r10:e0a21df4 r9:00000102 r8:00000000 r7:00000102 r6:8481b680 r5:e0a21f38 r4:81689154 [<81687fb4>] (unix_dgram_recvmsg) from [<813d0bd4>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81687fb4>] (unix_dgram_recvmsg) from [<813d0bd4>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81687fb4 [<813d0b84>] (sock_recvmsg) from [<813d0dd8>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804) r7:00000000 r6:8481b680 r5:200004c0 r4:e0a21f38 [<813d0d48>] (____sys_recvmsg) from [<813d3ebc>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846) r10:00000129 r9:840d4800 r8:8481b680 r7:00000102 r6:200004c0 r5:e0a21f38 r4:00000000 [<813d3e34>] (___sys_recvmsg) from [<813d469c>] (__sys_recvmsg net/socket.c:2876 [inline]) [<813d3e34>] (___sys_recvmsg) from [<813d469c>] (__do_sys_recvmsg net/socket.c:2886 [inline]) [<813d3e34>] (___sys_recvmsg) from [<813d469c>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883) r8:8020029c r7:00000102 r6:200004c0 r5:00000000 r4:8481b680 [<813d4628>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0a21fa8 to 0xe0a21ff0) 1fa0: 00000000 00000000 00000003 200004c0 00000102 00000000 1fc0: 00000000 00000000 001542c8 00000129 7ef65336 7ef65337 003d0f00 76b440fc 1fe0: 76b43f08 76b43ef8 00016f30 000516d0 r7:00000129 r6:001542c8 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