8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=84812003, *pmd=e9d02003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 6778 Comm: syz.0.552 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 : dffdddc0 ip : dffdde08 fp : dffdde04 r10: 00000362 r9 : 00000000 r8 : 8579c100 r7 : 84b9290c r6 : 84b92900 r5 : dffdde44 r4 : 862a2540 r3 : 00000001 r2 : 84b9290c r1 : dffdde44 r0 : 862a2540 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 854cc500 DAC: fffffffd Register r0 information: slab io_kiocb start 862a2540 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdffdc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 84b92900 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 862a2540 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdffdc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 84b92900 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 84b92900 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 8579c100 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 0xdffdc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdffdc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.0.552 (pid: 6778, stack limit = 0xdffdc000) Stack: (0xdffdddc0 to 0xdffde000) ddc0: 81a4be34 8030cb0c 84976900 00000001 00010000 84b9290c 00000000 862a2540 dde0: dffdde44 84b92900 84b9290c 00000000 80000001 00000362 dffdde1c dffdde08 de00: 80889cb0 80889554 8376fb80 862a2540 dffdde84 dffdde20 808931e0 80889c54 de20: dffdde4c dffdde30 8089ec2c 8050a4c4 00010001 00000001 8057abbc 00000000 de40: 00000000 84b9290c 00000000 00000000 00010001 8d73eac9 80886a40 862a2540 de60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 8506bc00 dffddebc dffdde88 de80: 80886bd8 80892f38 862a2180 862a20c0 862a2000 84976800 862a25ac 862a2540 dea0: 85760000 00000000 00000000 8506bc00 dffddf14 dffddec0 808877a8 80886b7c dec0: 8088e164 81a4bdd8 00000000 00000000 00000800 00000800 81cf0b5c 00000800 dee0: 84976800 8d73eac9 853b0600 00000000 84976800 00003516 853b0600 00000000 df00: 8506bc00 00000000 dffddfa4 dffddf18 80888250 808875a8 ecac8b10 84976840 df20: 00000000 00000000 81a4fbb0 81a4fa80 dffddf54 dffddf40 8026b438 8029ce1c df40: dffddfb0 40000000 dffddf84 dffddf58 802229dc 8026b3f4 00000000 8281d05c df60: dffddfb0 0014c490 ecac8b10 80222930 00000000 8d73eac9 dffddfac 00000000 df80: 00000000 002e630c 000001aa 8020029c 8506bc00 000001aa 00000000 dffddfa8 dfa0: 80200060 80888124 00000000 00000000 00000003 00003516 00000000 00000000 dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b560bc dfe0: 76b55ec0 76b55eb0 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) r10:00000362 r9:80000001 r8:00000000 r7:84b9290c r6:84b92900 r5:dffdde44 r4:862a2540 [<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) r5:862a2540 r4:8376fb80 [<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) r10:8506bc00 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:862a2540 [<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) r10:8506bc00 r9:00000000 r8:00000000 r7:85760000 r6:862a2540 r5:862a25ac r4:84976800 [<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 r9:8506bc00 r8:00000000 r7:853b0600 r6:00003516 r5:84976800 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdffddfa8 to 0xdffddff0) dfa0: 00000000 00000000 00000003 00003516 00000000 00000000 dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b560bc dfe0: 76b55ec0 76b55eb0 0001939c 00131f30 r10:000001aa r9:8506bc00 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