8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=8393d003, *pmd=df6f3003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 7561 Comm: syz.3.7855 Not tainted 6.15.0-rc6-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 : [<808896c0>] lr : [<80889e04>] psr: 20000013 sp : dfff5d90 ip : dfff5dd8 fp : dfff5dd4 r10: 00000240 r9 : 00000000 r8 : 85667440 r7 : 85811e0c r6 : 85811e00 r5 : dfff5e14 r4 : 85fbc9c0 r3 : 00000001 r2 : 85811e0c r1 : dfff5e14 r0 : 85fbc9c0 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8544d440 DAC: 00000000 Register r0 information: slab io_kiocb start 85fbc9c0 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfff4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85811e00 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 85fbc9c0 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfff4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 85811e00 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 85811e00 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 85667440 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 0xdfff4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfff4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.3.7855 (pid: 7561, stack limit = 0xdfff4000) Stack: (0xdfff5d90 to 0xdfff6000) 5d80: 81a4c394 8030cb14 85a2a100 00000001 5da0: 00010000 85811e0c 00000000 85fbc9c0 dfff5e14 85811e00 85811e0c 00000000 5dc0: 80000001 00000240 dfff5dec dfff5dd8 80889e04 808896a8 851f0500 85fbc9c0 5de0: dfff5e54 dfff5df0 80893334 80889da8 dfff5e14 dfff5e00 81a54028 8029ce24 5e00: 00010001 00000001 dfff5ebc 00000000 00000000 85811e0c 00000000 00000000 5e20: 00010001 2e45cc4b dfff5e54 85fbc9c0 81cf0ca0 00000000 00000000 00000000 5e40: 80000001 84dfe000 dfff5e7c dfff5e58 80882314 8089308c 85fbc9c0 80000001 5e60: 0000001b 81cf0b5c 855b1e40 00000000 dfff5ebc dfff5e80 80886de4 808822d4 5e80: 85fbcc00 85fbccc0 85fbcd80 81cf0ca0 85fbcf00 85a2a000 85fbca2c 85fbc9c0 5ea0: 861e0000 00000000 00000000 84dfe000 dfff5f14 dfff5ec0 808878fc 80886da8 5ec0: 8088e2b8 81a4c338 00000000 00000000 00000800 00000800 81cf0b5c 00000800 5ee0: 85a2a000 2e45cc4b 855b1f00 00000000 85a2a000 00003516 855b1f00 00000000 5f00: 84dfe000 00000000 dfff5fa4 dfff5f18 808883a4 808876fc ecac8b10 85a2a040 5f20: 00000000 00000000 81a50110 81a4ffe0 dfff5f54 dfff5f40 8026b438 8029ce24 5f40: dfff5fb0 40000000 dfff5f84 dfff5f58 802229dc 8026b3f4 00000000 8281d05c 5f60: dfff5fb0 0014c490 ecac8b10 80222930 00000000 2e45cc4b dfff5fac 00000000 5f80: 00000000 002e643c 000001aa 8020029c 84dfe000 000001aa 00000000 dfff5fa8 5fa0: 80200060 80888278 00000000 00000000 00000006 00003516 00000000 00000000 5fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76b030bc 5fe0: 76b02ec0 76b02eb0 0001939c 00131f30 60000010 00000006 00000000 00000000 Call trace: [<8088969c>] (io_ring_buffers_peek) from [<80889e04>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000240 r9:80000001 r8:00000000 r7:85811e0c r6:85811e00 r5:dfff5e14 r4:85fbc9c0 [<80889d9c>] (io_buffers_peek) from [<80893334>] (io_recv_buf_select io_uring/net.c:1077 [inline]) [<80889d9c>] (io_buffers_peek) from [<80893334>] (io_recv+0x2b4/0x46c io_uring/net.c:1138) r5:85fbc9c0 r4:851f0500 [<80893080>] (io_recv) from [<80882314>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734) r10:84dfe000 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0ca0 r4:85fbc9c0 [<808822c8>] (__io_issue_sqe) from [<80886de4>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757) r9:00000000 r8:855b1e40 r7:81cf0b5c r6:0000001b r5:80000001 r4:85fbc9c0 [<80886d9c>] (io_issue_sqe) from [<808878fc>] (io_queue_sqe io_uring/io_uring.c:1963 [inline]) [<80886d9c>] (io_issue_sqe) from [<808878fc>] (io_submit_sqe io_uring/io_uring.c:2219 [inline]) [<80886d9c>] (io_issue_sqe) from [<808878fc>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2336) r10:84dfe000 r9:00000000 r8:00000000 r7:861e0000 r6:85fbc9c0 r5:85fbca2c r4:85a2a000 [<808876f0>] (io_submit_sqes) from [<808883a4>] (__do_sys_io_uring_enter io_uring/io_uring.c:3396 [inline]) [<808876f0>] (io_submit_sqes) from [<808883a4>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3330) r10:00000000 r9:84dfe000 r8:00000000 r7:855b1f00 r6:00003516 r5:85a2a000 r4:00000000 [<8088826c>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfff5fa8 to 0xdfff5ff0) 5fa0: 00000000 00000000 00000006 00003516 00000000 00000000 5fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76b030bc 5fe0: 76b02ec0 76b02eb0 0001939c 00131f30 r10:000001aa r9:84dfe000 r8:8020029c r7:000001aa r6:002e643c 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