8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=85d7c003, *pmd=ed620003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 16174 Comm: syz.5.2087 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 : dff15db0 ip : dff15df8 fp : dff15df4 r10: f7eeffff r9 : 00000000 r8 : 8548f380 r7 : 00000000 r6 : 00004040 r5 : dff15e44 r4 : 84556000 r3 : 00000001 r2 : 85a0050c r1 : dff15e44 r0 : 84556000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8557b440 DAC: 00000000 Register r0 information: slab io_kiocb start 84556000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdff14000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85a00500 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 84556000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdff14000 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 8548f380 pointer offset 0 size 64 Register r9 information: NULL pointer Register r10 information: vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdff14000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdff14000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.5.2087 (pid: 16174, stack limit = 0xdff14000) Stack: (0xdff15db0 to 0xdff16000) 5da0: 81a4be34 8030cb0c 85565100 00000000 5dc0: 00000000 85a0050c 00000000 84556000 8548f380 00004040 00000000 dff15e44 5de0: 85565000 f7eeffff dff15e24 dff15df8 80889be0 80889554 00000001 00000000 5e00: 84556000 00004040 85a00500 80000001 00000000 f7eeffff dff15e84 dff15e28 5e20: 8089263c 80889b58 8089ec2c 000000e8 dff15e5c dff15e40 85a0050c 837a7900 5e40: 84556000 85a0050c 00000000 200440c0 00000001 a491055b 80886a40 84556000 5e60: 81cf0c94 00000000 80000001 81cf0b5c 0000001a 849eec00 dff15ebc dff15e88 5e80: 80886bd8 80892328 84556000 870c0000 84556000 85565000 8455606c 84556000 5ea0: 870c0000 00000000 00000000 849eec00 dff15f14 dff15ec0 808877a8 80886b7c 5ec0: 8088e164 81a4bdd8 00000000 00000000 00000001 00000001 81cf0b5c 00000001 5ee0: 85565000 a491055b 847a9840 00000000 85565000 000027e2 847a9840 00000000 5f00: 849eec00 00000000 dff15fa4 dff15f18 80888250 808875a8 ecac8b10 85565040 5f20: 00000000 00000000 81a4fbb0 81a4fa80 dff15f54 dff15f40 8026b438 8029ce1c 5f40: dff15fb0 40000000 dff15f84 dff15f58 802229dc 8026b3f4 00000000 8281d05c 5f60: dff15fb0 0014c490 ecac8b10 80222930 00000000 a491055b dff15fac 00000000 5f80: 00000000 002e630c 000001aa 8020029c 849eec00 000001aa 00000000 dff15fa8 5fa0: 80200060 80888124 00000000 00000000 00000003 000027e2 00000000 00000000 5fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b9a0bc 5fe0: 76b99ec0 76b99eb0 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 r9:85565000 r8:dff15e44 r7:00000000 r6:00004040 r5:8548f380 r4:84556000 [<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 r7:85a00500 r6:00004040 r5:84556000 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) r10:849eec00 r9:0000001a r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0c94 r4:84556000 [<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) r10:849eec00 r9:00000000 r8:00000000 r7:870c0000 r6:84556000 r5:8455606c r4:85565000 [<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 r9:849eec00 r8:00000000 r7:847a9840 r6:000027e2 r5:85565000 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdff15fa8 to 0xdff15ff0) 5fa0: 00000000 00000000 00000003 000027e2 00000000 00000000 5fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b9a0bc 5fe0: 76b99ec0 76b99eb0 0001939c 00131f30 r10:000001aa r9:849eec00 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