8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=855c0003, *pmd=eb865003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 7132 Comm: syz.0.877 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 : e01bddb0 ip : e01bddf8 fp : e01bddf4 r10: f7eeffff r9 : 00000000 r8 : 85549580 r7 : 00000000 r6 : 00004040 r5 : e01bde44 r4 : 85b0a600 r3 : 00000001 r2 : 8541920c r1 : e01bde44 r0 : 85b0a600 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 855496c0 DAC: fffffffd Register r0 information: slab io_kiocb start 85b0a600 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xe01bc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85419200 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 85b0a600 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xe01bc000 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 85549580 pointer offset 0 size 64 Register r9 information: NULL pointer Register r10 information: vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xe01bc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xe01bc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.0.877 (pid: 7132, stack limit = 0xe01bc000) Stack: (0xe01bddb0 to 0xe01be000) dda0: 81a4be34 8030cb0c 85545900 00000000 ddc0: 00000000 8541920c 00000000 85b0a600 85549580 00004040 00000000 e01bde44 dde0: 85545800 f7eeffff e01bde24 e01bddf8 80889be0 80889554 00000001 00000000 de00: 85b0a600 00004040 85419200 80000001 00000000 f7eeffff e01bde84 e01bde28 de20: 8089263c 80889b58 8089ec2c 802dbb08 e01bde5c e01bde40 8541920c 84c41400 de40: 85b0a600 8541920c 00000000 20044080 00000001 88aa4223 80886a40 85b0a600 de60: 81cf0c94 00000000 80000001 81cf0b5c 0000001a 8387b000 e01bdebc e01bde88 de80: 80886bd8 80892328 85b0a600 85840000 85b0a600 85545800 85b0a66c 85b0a600 dea0: 85840000 00000000 00000000 8387b000 e01bdf14 e01bdec0 808877a8 80886b7c dec0: 8088e238 81a55010 e01bdf24 e01bded8 00000001 00000001 81cf0b5c 00000001 dee0: 85545800 88aa4223 855ab840 00000000 85545800 000027e2 855ab840 00000000 df00: 8387b000 00000000 e01bdfa4 e01bdf18 80888250 808875a8 ecac8b10 85545840 df20: 00000000 00000000 81a4fbb0 81a4fa80 e01bdf54 e01bdf40 8026b438 8029ce1c df40: e01bdfb0 40000000 e01bdf84 e01bdf58 802229dc 8026b3f4 00000000 8281d05c df60: e01bdfb0 0014c490 ecac8b10 80222930 00000000 88aa4223 e01bdfac 00000000 df80: 00000000 002e63a4 000001aa 8020029c 8387b000 000001aa 00000000 e01bdfa8 dfa0: 80200060 80888124 00000000 00000000 00000003 000027e2 00000000 00000000 dfc0: 00000000 00000000 002e63a4 000001aa 002d0000 00000000 00006364 76ae10bc dfe0: 76ae0ec0 76ae0eb0 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 r9:85545800 r8:e01bde44 r7:00000000 r6:00004040 r5:85549580 r4:85b0a600 [<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 r7:85419200 r6:00004040 r5:85b0a600 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) r10:8387b000 r9:0000001a r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0c94 r4:85b0a600 [<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) r10:8387b000 r9:00000000 r8:00000000 r7:85840000 r6:85b0a600 r5:85b0a66c r4:85545800 [<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 r9:8387b000 r8:00000000 r7:855ab840 r6:000027e2 r5:85545800 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe01bdfa8 to 0xe01bdff0) dfa0: 00000000 00000000 00000003 000027e2 00000000 00000000 dfc0: 00000000 00000000 002e63a4 000001aa 002d0000 00000000 00006364 76ae10bc dfe0: 76ae0ec0 76ae0eb0 0001939c 00131f30 r10:000001aa r9:8387b000 r8:8020029c r7:000001aa r6:002e63a4 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