8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=85e20003, *pmd=f0ff7003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4636 Comm: syz.1.236 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_peek+0x68/0x8c io_uring/kbuf.c:343 pc : [<8088956c>] lr : [<80889cb0>] psr: 20000013 sp : dfa45dc0 ip : dfa45e08 fp : dfa45e04 r10: 00012361 r9 : 00000000 r8 : 84cedf40 r7 : 852ac90c r6 : 852ac900 r5 : dfa45e44 r4 : 8597f240 r3 : 00000001 r2 : 852ac90c r1 : dfa45e44 r0 : 8597f240 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8500ef40 DAC: 00000000 Register r0 information: slab io_kiocb start 8597f240 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfa44000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 852ac900 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 8597f240 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfa44000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 852ac900 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 852ac900 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 84cedf40 pointer offset 0 size 64 Register r9 information: NULL pointer Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfa44000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfa44000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.1.236 (pid: 4636, stack limit = 0xdfa44000) Stack: (0xdfa45dc0 to 0xdfa46000) 5dc0: 81a4be54 8030cb0c 84b6e100 00000001 00010000 852ac90c 00000000 8597f240 5de0: dfa45e44 852ac900 852ac90c 00000000 80000001 00012361 dfa45e1c dfa45e08 5e00: 80889cb0 80889554 85418500 8597f240 dfa45e84 dfa45e20 808931e0 80889c54 5e20: dfa45e4c dfa45e30 8089ec2c 8050a4c4 00010001 00000001 8057abbc 00000000 5e40: 00000000 852ac90c 00000000 00000000 00010001 18e66cd4 80886a40 8597f240 5e60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 840ed400 dfa45ebc dfa45e88 5e80: 80886bd8 80892f38 8597f9c0 8597fb40 8597f0c0 84b6e000 8597f2ac 8597f240 5ea0: 85940000 00000000 00000000 840ed400 dfa45f14 dfa45ec0 808877a8 80886b7c 5ec0: 8088e164 81a4bdf8 00000000 00000000 00000800 00000800 81cf0b5c 00000800 5ee0: 84b6e000 18e66cd4 8495e840 00000042 84b6e000 00003517 8495e840 00000000 5f00: 840ed400 00000000 dfa45fa4 dfa45f18 80888250 808875a8 ecac8b10 84b6e040 5f20: 00000000 0000173d 81a4fbd0 81a4faa0 dfa45f54 dfa45f40 8026b438 8029ce1c 5f40: dfa45fb0 40000000 dfa45f84 dfa45f58 802229dc 8026b3f4 00000000 8281d05c 5f60: dfa45fb0 0014c490 ecac8b10 80222930 00000000 18e66cd4 dfa45fac 00000000 5f80: 00000000 002e630c 000001aa 8020029c 840ed400 000001aa 00000000 dfa45fa8 5fa0: 80200060 80888124 00000000 00000000 00000003 00003517 0000173d 00000042 5fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bc00bc 5fe0: 76bbfec0 76bbfeb0 0001939c 00131f30 60000010 00000003 00000000 00000000 Call trace: [<80889548>] (io_ring_buffers_peek) from [<80889cb0>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00012361 r9:80000001 r8:00000000 r7:852ac90c r6:852ac900 r5:dfa45e44 r4:8597f240 [<80889c48>] (io_buffers_peek) from [<808931e0>] (io_recv_buf_select io_uring/net.c:1077 [inline]) [<80889c48>] (io_buffers_peek) from [<808931e0>] (io_recv+0x2b4/0x46c io_uring/net.c:1138) r5:8597f240 r4:85418500 [<80892f2c>] (io_recv) from [<80886bd8>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline]) [<80892f2c>] (io_recv) from [<80886bd8>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759) r10:840ed400 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:8597f240 [<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) r10:840ed400 r9:00000000 r8:00000000 r7:85940000 r6:8597f240 r5:8597f2ac r4:84b6e000 [<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 r9:840ed400 r8:00000000 r7:8495e840 r6:00003517 r5:84b6e000 r4:00000042 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa45fa8 to 0xdfa45ff0) 5fa0: 00000000 00000000 00000003 00003517 0000173d 00000042 5fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bc00bc 5fe0: 76bbfec0 76bbfeb0 0001939c 00131f30 r10:000001aa r9:840ed400 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