8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8d499003, *pmd=fe699003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 11188 Comm: syz-executor.1 Not tainted 6.8.0-rc7-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1097 [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 : [<8046d12c>] lr : [<807d2c50>] psr: 60000013 sp : dff2dc00 ip : dff2dc10 fp : dff2dc0c r10: 00000018 r9 : 828504e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8f736c00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 873f0340 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 8f736c00 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 0xdff2c000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xdff2c000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.1 (pid: 11188, stack limit = 0xdff2c000) Stack: (0xdff2dc00 to 0xdff2e000) dc00: dff2dc44 dff2dc10 807d2c50 8046d12c dff2dc34 dff2def0 8024c7e8 8f736c00 dc20: 8f736c00 00000000 00000001 00000000 0000005b 00000018 dff2dc94 dff2dc48 dc40: 813d94d8 807d2b64 40000013 848a8f40 8dfeb200 8dfeb2d0 82e03000 8dfeb2d8 dc60: dff2def0 00000000 dff2dc94 82e03000 0000005b 8dfeb200 84d2ec00 00000001 dc80: 00000000 00000000 dff2dd04 dff2dc98 815f7de8 813d93f4 00000000 00000000 dca0: 00000000 8dfeb2d0 8dfeb2c0 7fffffff 82e030a8 8dfeb2ec 82e03234 dff2dee0 dcc0: 00000000 84d2ec00 802a154c 00000100 00000122 e154b154 dff2dee0 815f7c98 dce0: dff2dee0 848a8f00 00000000 20000400 00000000 dff2dd54 dff2dd24 dff2dd08 dd00: 815f710c 815f7ca4 00000000 00000000 20000400 815f70d4 dff2dd44 dff2dd28 dd20: 8134c548 815f70e0 dff2dee0 848a8f00 20000fc0 00000000 dff2de04 dff2dd48 dd40: 8134c74c 8134c504 00000002 00000000 00000000 00000000 00000000 00000000 dd60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dd80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dda0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ddc0: 00000000 00000000 00000000 00000000 00000000 e154b154 00000000 00000000 dde0: dff2dee0 20000fc0 00000000 848a8f00 84d2ec00 00000002 dff2de84 dff2de08 de00: 8134f664 8134c6c8 00000000 00000000 81a02a90 00000000 20000400 20000480 de20: 0000005b 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 e154b154 de60: dff2de84 dff2dec0 20000fc0 00000000 00000000 00000000 dff2df5c dff2de88 de80: 8134f78c 8134f5e8 00000000 dff2de98 808841b0 848a8f00 00000001 00000000 dea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dec0: 000f4240 dff2ded8 00050bc0 00000000 00000000 00000000 dff2df04 dff2dee8 dee0: dff2dd54 00000000 00000000 00000000 00000001 00000001 dff2de1c 0000005a df00: 00000002 00000000 00000000 00000001 00000000 00000000 00000000 00000000 df20: 00000000 00000000 dff2df44 e154b154 81856c20 00000003 20000fc0 00000000 df40: 00000000 00000002 84d2ec00 0000016d dff2dfa4 dff2df60 8135015c 8134f6a4 df60: 00000000 dff2dfb0 00000000 00000000 00000000 00000000 dff2dfac e154b154 df80: 8020ca34 00000000 00000000 0014c2d0 0000016d 80200288 00000000 dff2dfa8 dfa0: 80200060 813500a4 00000000 00000000 00000003 20000fc0 00000002 00000000 dfc0: 00000000 00000000 0014c2d0 0000016d 7ee2f32e 7ee2f32f 003d0f00 76b980fc dfe0: 76b97f08 76b97ef8 000167f8 00050bc0 60000010 00000003 00000000 00000000 Backtrace: [<8046d120>] (__kmap_local_page_prot) from [<807d2c50>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d120>] (__kmap_local_page_prot) from [<807d2c50>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807d2b58>] (copy_page_to_iter) from [<813d94d8>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:0000005b r8:00000000 r7:00000001 r6:00000000 r5:8f736c00 r4:8f736c00 [<813d93e8>] (sk_msg_recvmsg) from [<815f7de8>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d93e8>] (sk_msg_recvmsg) from [<815f7de8>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:84d2ec00 r6:8dfeb200 r5:0000005b r4:82e03000 [<815f7c98>] (unix_bpf_recvmsg) from [<815f710c>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2468) r10:dff2dd54 r9:00000000 r8:20000400 r7:00000000 r6:848a8f00 r5:dff2dee0 r4:815f7c98 [<815f70d4>] (unix_dgram_recvmsg) from [<8134c548>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f70d4>] (unix_dgram_recvmsg) from [<8134c548>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f70d4 [<8134c4f8>] (sock_recvmsg) from [<8134c74c>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20000fc0 r5:848a8f00 r4:dff2dee0 [<8134c6bc>] (____sys_recvmsg) from [<8134f664>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000002 r9:84d2ec00 r8:848a8f00 r7:00000000 r6:20000fc0 r5:dff2dee0 r4:00000000 [<8134f5dc>] (___sys_recvmsg) from [<8134f78c>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000000 r5:20000fc0 r4:dff2dec0 [<8134f698>] (do_recvmmsg) from [<8135015c>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8134f698>] (do_recvmmsg) from [<8135015c>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8134f698>] (do_recvmmsg) from [<8135015c>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:84d2ec00 r8:00000002 r7:00000000 r6:00000000 r5:20000fc0 r4:00000003 [<81350098>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdff2dfa8 to 0xdff2dff0) dfa0: 00000000 00000000 00000003 20000fc0 00000002 00000000 dfc0: 00000000 00000000 0014c2d0 0000016d 7ee2f32e 7ee2f32f 003d0f00 76b980fc dfe0: 76b97f08 76b97ef8 000167f8 00050bc0 r8:80200288 r7:0000016d r6:0014c2d0 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