8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=85173003, *pmd=fd861003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 6006 Comm: syz-executor.0 Not tainted 6.9.0-rc5-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 : [<8047a19c>] lr : [<807e9c0c>] psr: 60000013 sp : dfc15c00 ip : dfc15c10 fp : dfc15c0c r10: 00000018 r9 : 8285a4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 85088400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85191bc0 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 85088400 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 0xdfc14000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Register r12 information: 2-page vmalloc region starting at 0xdfc14000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797 Process syz-executor.0 (pid: 6006, stack limit = 0xdfc14000) Stack: (0xdfc15c00 to 0xdfc16000) 5c00: dfc15c44 dfc15c10 807e9c0c 8047a19c dfc15c34 dfc15ef0 8024c860 85088400 5c20: 85088400 00000000 00000001 00000000 00022fe0 00000018 dfc15c94 dfc15c48 5c40: 81433a5c 807e9b20 00000000 3fb3bdb1 84411400 844114d0 84cfed00 844114d8 5c60: dfc15ef0 00000002 dfc15cec 84cfed00 00022fe0 84411400 84dbec00 00000000 5c80: 00000002 00000000 dfc15d04 dfc15c98 81656720 81433978 00000002 00000000 5ca0: 00000000 00000000 00000000 00000000 84cfed88 844114ec 84cfef34 dfc15ee0 5cc0: 00000000 3fb3bdb1 00d81af2 821a9848 00000002 3fb3bdb1 dfc15ee0 816565d0 5ce0: dfc15ee0 848ed400 00000002 00000000 00000002 dfc15d54 dfc15d24 dfc15d08 5d00: 8165579c 816565dc 00000000 00000002 00000000 81655764 dfc15d44 dfc15d28 5d20: 813a2fd4 81655770 dfc15ee0 848ed400 200033c0 00000000 dfc15e04 dfc15d48 5d40: 813a31d4 813a2f90 00000000 00000000 00000001 00000000 00000000 00000000 5d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5dc0: 00000000 00000000 00000000 00000000 00000000 3fb3bdb1 00000000 00000000 5de0: dfc15ee0 200033c0 00000002 848ed400 84dbec00 00000001 dfc15e84 dfc15e08 5e00: 813a6118 813a3150 00000002 00000000 8031cab4 00000000 00000000 200003c0 5e20: 00022fe0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 3fb3bdb1 5e60: dfc15e84 dfc15ec0 200033c0 00000000 00000002 00000000 dfc15f5c dfc15e88 5e80: 813a6240 813a609c 00000000 dfc15e98 8089ac78 848ed400 00000001 00000000 5ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5ec0: 00000000 00000000 00050bf0 00000000 00000000 00000000 dfc15f04 dfc15ee8 5ee0: dfc15d54 00000000 00000000 00000000 00000000 00000001 200003c0 00022fdf 5f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 5f20: 00000000 00000000 dfc15f44 3fb3bdb1 818c0cd0 00000004 200033c0 00000000 5f40: 00000002 00000001 84dbec00 0000016d dfc15fa4 dfc15f60 813a6bd4 813a6158 5f60: 00000000 dfc15fb0 00000000 00000000 00000000 00000000 dfc15fac 3fb3bdb1 5f80: 8020ca6c 00000000 00000000 0014c2d0 0000016d 80200288 00000000 dfc15fa8 5fa0: 80200060 813a6b1c 00000000 00000000 00000004 200033c0 00000001 00000002 5fc0: 00000000 00000000 0014c2d0 0000016d 7e9ca32e 7e9ca32f 003d0f00 76b530fc 5fe0: 76b52f08 76b52ef8 00016ab0 00050bf0 60000010 00000004 00000000 00000000 Call trace: [<8047a190>] (__kmap_local_page_prot) from [<807e9c0c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8047a190>] (__kmap_local_page_prot) from [<807e9c0c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807e9b14>] (copy_page_to_iter) from [<81433a5c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00022fe0 r8:00000000 r7:00000001 r6:00000000 r5:85088400 r4:85088400 [<8143396c>] (sk_msg_recvmsg) from [<81656720>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8143396c>] (sk_msg_recvmsg) from [<81656720>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000002 r8:00000000 r7:84dbec00 r6:84411400 r5:00022fe0 r4:84cfed00 [<816565d0>] (unix_bpf_recvmsg) from [<8165579c>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfc15d54 r9:00000002 r8:00000000 r7:00000002 r6:848ed400 r5:dfc15ee0 r4:816565d0 [<81655764>] (unix_dgram_recvmsg) from [<813a2fd4>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<81655764>] (unix_dgram_recvmsg) from [<813a2fd4>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:81655764 [<813a2f84>] (sock_recvmsg) from [<813a31d4>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200033c0 r5:848ed400 r4:dfc15ee0 [<813a3144>] (____sys_recvmsg) from [<813a6118>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000001 r9:84dbec00 r8:848ed400 r7:00000002 r6:200033c0 r5:dfc15ee0 r4:00000000 [<813a6090>] (___sys_recvmsg) from [<813a6240>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000002 r6:00000000 r5:200033c0 r4:dfc15ec0 [<813a614c>] (do_recvmmsg) from [<813a6bd4>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<813a614c>] (do_recvmmsg) from [<813a6bd4>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<813a614c>] (do_recvmmsg) from [<813a6bd4>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:84dbec00 r8:00000001 r7:00000002 r6:00000000 r5:200033c0 r4:00000004 [<813a6b10>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfc15fa8 to 0xdfc15ff0) 5fa0: 00000000 00000000 00000004 200033c0 00000001 00000002 5fc0: 00000000 00000000 0014c2d0 0000016d 7e9ca32e 7e9ca32f 003d0f00 76b530fc 5fe0: 76b52f08 76b52ef8 00016ab0 00050bf0 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