8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=85469003, *pmd=df5d5003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4048 Comm: syz.0.80 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 : df9f5dc0 ip : df9f5e08 fp : df9f5e04 r10: 00000242 r9 : 00000000 r8 : 85461a80 r7 : 8540150c r6 : 85401500 r5 : df9f5e44 r4 : 855ee000 r3 : 00000001 r2 : 8540150c r1 : df9f5e44 r0 : 855ee000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8545cb00 DAC: 00000000 Register r0 information: slab io_kiocb start 855ee000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdf9f4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85401500 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 855ee000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdf9f4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 85401500 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 85401500 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 85461a80 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 0xdf9f4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdf9f4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.0.80 (pid: 4048, stack limit = 0xdf9f4000) Stack: (0xdf9f5dc0 to 0xdf9f6000) 5dc0: 81a4be54 8030cb0c 84baf100 00000001 00010000 8540150c 00000000 855ee000 5de0: df9f5e44 85401500 8540150c 00000000 80000001 00000242 df9f5e1c df9f5e08 5e00: 80889cb0 80889554 8365b400 855ee000 df9f5e84 df9f5e20 808931e0 80889c54 5e20: df9f5e4c df9f5e30 8089ec2c 8050a4c4 00010001 00000001 8057abbc 00000000 5e40: 00000000 8540150c 00000000 00000000 00010001 064be659 80886a40 855ee000 5e60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 841ea400 df9f5ebc df9f5e88 5e80: 80886bd8 80892f38 855ee3c0 855ee480 855ee540 84baf000 855ee06c 855ee000 5ea0: 85640000 00000000 00000000 841ea400 df9f5f14 df9f5ec0 808877a8 80886b7c 5ec0: 8088e164 81a4bdf8 00000000 00000000 00000800 00000800 81cf0b5c 00000800 5ee0: 84baf000 064be659 84f5f840 00000000 84baf000 00003516 84f5f840 00000000 5f00: 841ea400 00000000 df9f5fa4 df9f5f18 80888250 808875a8 ecac8b10 84baf040 5f20: 00000000 00000000 81a4fbd0 81a4faa0 df9f5f54 df9f5f40 8026b438 8029ce1c 5f40: df9f5fb0 40000000 df9f5f84 df9f5f58 802229dc 8026b3f4 00000000 8281d05c 5f60: df9f5fb0 0014c490 ecac8b10 80222930 00000000 064be659 df9f5fac 00000000 5f80: 00000000 002e630c 000001aa 8020029c 841ea400 000001aa 00000000 df9f5fa8 5fa0: 80200060 80888124 00000000 00000000 00000006 00003516 00000000 00000000 5fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b0b0bc 5fe0: 76b0aec0 76b0aeb0 0001939c 00131f30 60000010 00000006 00000000 00000000 Call trace: [<80889548>] (io_ring_buffers_peek) from [<80889cb0>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000242 r9:80000001 r8:00000000 r7:8540150c r6:85401500 r5:df9f5e44 r4:855ee000 [<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) r5:855ee000 r4:8365b400 [<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) r10:841ea400 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:855ee000 [<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) r10:841ea400 r9:00000000 r8:00000000 r7:85640000 r6:855ee000 r5:855ee06c r4:84baf000 [<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 r9:841ea400 r8:00000000 r7:84f5f840 r6:00003516 r5:84baf000 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9f5fa8 to 0xdf9f5ff0) 5fa0: 00000000 00000000 00000006 00003516 00000000 00000000 5fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b0b0bc 5fe0: 76b0aec0 76b0aeb0 0001939c 00131f30 r10:000001aa r9:841ea400 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