8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=856f0003, *pmd=ed7f7003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 26030 Comm: syz.2.7408 Not tainted 6.15.0-rc5-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at io_ring_buffers_peek+0x24/0x258 io_uring/kbuf.c:227 LR is at io_buffers_select+0x94/0xfc io_uring/kbuf.c:310 pc : [<8088956c>] lr : [<80889be0>] psr: 20000013 sp : dfd1ddb0 ip : dfd1ddf8 fp : dfd1ddf4 r10: f7eeffff r9 : 00000000 r8 : 853542c0 r7 : 00000000 r6 : 00004040 r5 : dfd1de44 r4 : 86f7e000 r3 : 00000001 r2 : 852eaa0c r1 : dfd1de44 r0 : 86f7e000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8559db00 DAC: 00000000 Register r0 information: slab io_kiocb start 86f7e000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfd1c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 852eaa00 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 86f7e000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfd1c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: slab kmalloc-64 start 853542c0 pointer offset 0 size 64 Register r9 information: NULL pointer Register r10 information: vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfd1c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfd1c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.2.7408 (pid: 26030, stack limit = 0xdfd1c000) Stack: (0xdfd1ddb0 to 0xdfd1e000) dda0: 81a4be54 8030cb0c 84ca0900 00000000 ddc0: 00000000 852eaa0c 00000000 86f7e000 853542c0 00004040 00000000 dfd1de44 dde0: 84ca0800 f7eeffff dfd1de24 dfd1ddf8 80889be0 80889554 00000001 00000000 de00: 86f7e000 00004040 852eaa00 80000001 00000000 f7eeffff dfd1de84 dfd1de28 de20: 8089263c 80889b58 8089ec2c 000000e8 dfd1de5c dfd1de40 852eaa0c 83685180 de40: 86f7e000 852eaa0c 00000000 200440c0 00000001 f9d2913f 80886a40 86f7e000 de60: 81cf0c94 00000000 80000001 81cf0b5c 0000001a 84468c00 dfd1debc dfd1de88 de80: 80886bd8 80892328 86f7e000 85800000 86f7e000 84ca0800 86f7e06c 86f7e000 dea0: 85800000 00000000 00000000 84468c00 dfd1df14 dfd1dec0 808877a8 80886b7c dec0: 8088e164 81a4bdf8 00000000 00000000 00000001 00000001 81cf0b5c 00000001 dee0: 84ca0800 f9d2913f 847696c0 00000000 84ca0800 000027e2 847696c0 00000000 df00: 84468c00 00000000 dfd1dfa4 dfd1df18 80888250 808875a8 ecac8b10 84ca0840 df20: 00000000 00000000 81a4fbd0 81a4faa0 dfd1df54 dfd1df40 8026b438 8029ce1c df40: dfd1dfb0 40000000 dfd1df84 dfd1df58 802229dc 8026b3f4 00000000 8281d05c df60: dfd1dfb0 0014c490 ecac8b10 80222930 00000000 f9d2913f dfd1dfac 00000000 df80: 00000000 002e630c 000001aa 8020029c 84468c00 000001aa 00000000 dfd1dfa8 dfa0: 80200060 80888124 00000000 00000000 00000003 000027e2 00000000 00000000 dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bf00bc dfe0: 76befec0 76befeb0 0001939c 00131f30 60000010 00000003 00000000 00000000 Call trace: [<80889548>] (io_ring_buffers_peek) from [<80889be0>] (io_buffers_select+0x94/0xfc io_uring/kbuf.c:310) r10:f7eeffff r9:84ca0800 r8:dfd1de44 r7:00000000 r6:00004040 r5:853542c0 r4:86f7e000 [<80889b4c>] (io_buffers_select) from [<8089263c>] (io_send_select_buffer io_uring/net.c:587 [inline]) [<80889b4c>] (io_buffers_select) from [<8089263c>] (io_send+0x320/0x490 io_uring/net.c:635) r10:f7eeffff r9:00000000 r8:80000001 r7:852eaa00 r6:00004040 r5:86f7e000 r4:00000000 r3:00000001 [<8089231c>] (io_send) from [<80886bd8>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline]) [<8089231c>] (io_send) from [<80886bd8>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759) r10:84468c00 r9:0000001a r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0c94 r4:86f7e000 [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_queue_sqe io_uring/io_uring.c:1975 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqe io_uring/io_uring.c:2231 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2348) r10:84468c00 r9:00000000 r8:00000000 r7:85800000 r6:86f7e000 r5:86f7e06c r4:84ca0800 [<8088759c>] (io_submit_sqes) from [<80888250>] (__do_sys_io_uring_enter io_uring/io_uring.c:3408 [inline]) [<8088759c>] (io_submit_sqes) from [<80888250>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3342) r10:00000000 r9:84468c00 r8:00000000 r7:847696c0 r6:000027e2 r5:84ca0800 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfd1dfa8 to 0xdfd1dff0) dfa0: 00000000 00000000 00000003 000027e2 00000000 00000000 dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bf00bc dfe0: 76befec0 76befeb0 0001939c 00131f30 r10:000001aa r9:84468c00 r8:8020029c r7:000001aa r6:002e630c r5:00000000 r4:00000000 Code: e1a08002 e5912000 e50b2030 e1a05001 (e1d920be) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e1a08002 mov r8, r2 4: e5912000 ldr r2, [r1] 8: e50b2030 str r2, [fp, #-48] @ 0xffffffd0 c: e1a05001 mov r5, r1 * 10: e1d920be ldrh r2, [r9, #14] <-- trapping instruction