8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=86358003, *pmd=ef38d003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 14210 Comm: syz.0.2661 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 : [<80889608>] lr : [<80889d4c>] psr: 20000013 sp : dfa49d90 ip : dfa49dd8 fp : dfa49dd4 r10: 00000242 r9 : 00000000 r8 : 849ed940 r7 : 8514c30c r6 : 8514c300 r5 : dfa49e14 r4 : 85341000 r3 : 00000001 r2 : 8514c30c r1 : dfa49e14 r0 : 85341000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 850fe180 DAC: 00000000 Register r0 information: slab io_kiocb start 85341000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfa48000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 8514c300 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 85341000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfa48000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 8514c300 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 8514c300 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 849ed940 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 0xdfa48000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfa48000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.0.2661 (pid: 14210, stack limit = 0xdfa48000) Stack: (0xdfa49d90 to 0xdfa4a000) 9d80: 81a4c2d4 8030cb14 855e2100 00000001 9da0: 00010000 8514c30c 00000000 85341000 dfa49e14 8514c300 8514c30c 00000000 9dc0: 80000001 00000242 dfa49dec dfa49dd8 80889d4c 808895f0 84d03180 85341000 9de0: dfa49e54 dfa49df0 8089327c 80889cf0 00000000 dfa49dd8 8514c300 d542e4a4 9e00: 00010001 00000001 855e2128 00000000 00000000 8514c30c 00000000 00000000 9e20: 00010001 d542e4a4 dfa49e54 85341000 81cf0ca0 00000000 00000000 00000000 9e40: 80000001 8456b000 dfa49e7c dfa49e58 8088225c 80892fd4 85341000 80000001 9e60: 0000001b 81cf0b5c 84594240 00000000 dfa49ebc dfa49e80 80886d2c 8088221c 9e80: 85341240 85341300 853413c0 81cf0ca0 85341540 855e2000 8534106c 85341000 9ea0: 86300000 00000000 00000000 8456b000 dfa49f14 dfa49ec0 80887844 80886cf0 9ec0: 8088e200 81a4c278 dfa49f24 dfa49ed8 00000800 00000800 81cf0b5c 00000800 9ee0: 855e2000 d542e4a4 84594f00 00000000 855e2000 00003516 84594f00 00000000 9f00: 8456b000 00000000 dfa49fa4 dfa49f18 808882ec 80887644 ecac8b10 855e2040 9f20: 00000000 00000000 81a50050 81a4ff20 dfa49f54 dfa49f40 8026b438 8029ce24 9f40: dfa49fb0 40000000 dfa49f84 dfa49f58 802229dc 8026b3f4 00000000 8281d05c 9f60: dfa49fb0 0014c490 ecac8b10 80222930 00000000 d542e4a4 dfa49fac 00000000 9f80: 00000000 002e643c 000001aa 8020029c 8456b000 000001aa 00000000 dfa49fa8 9fa0: 80200060 808881c0 00000000 00000000 00000007 00003516 00000000 00000000 9fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76b6c0bc 9fe0: 76b6bec0 76b6beb0 0001939c 00131f30 60000010 00000007 00000000 00000000 Call trace: [<808895e4>] (io_ring_buffers_peek) from [<80889d4c>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000242 r9:80000001 r8:00000000 r7:8514c30c r6:8514c300 r5:dfa49e14 r4:85341000 [<80889ce4>] (io_buffers_peek) from [<8089327c>] (io_recv_buf_select io_uring/net.c:1077 [inline]) [<80889ce4>] (io_buffers_peek) from [<8089327c>] (io_recv+0x2b4/0x46c io_uring/net.c:1138) r5:85341000 r4:84d03180 [<80892fc8>] (io_recv) from [<8088225c>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734) r10:8456b000 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0ca0 r4:85341000 [<80882210>] (__io_issue_sqe) from [<80886d2c>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757) r9:00000000 r8:84594240 r7:81cf0b5c r6:0000001b r5:80000001 r4:85341000 [<80886ce4>] (io_issue_sqe) from [<80887844>] (io_queue_sqe io_uring/io_uring.c:1963 [inline]) [<80886ce4>] (io_issue_sqe) from [<80887844>] (io_submit_sqe io_uring/io_uring.c:2219 [inline]) [<80886ce4>] (io_issue_sqe) from [<80887844>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2336) r10:8456b000 r9:00000000 r8:00000000 r7:86300000 r6:85341000 r5:8534106c r4:855e2000 [<80887638>] (io_submit_sqes) from [<808882ec>] (__do_sys_io_uring_enter io_uring/io_uring.c:3396 [inline]) [<80887638>] (io_submit_sqes) from [<808882ec>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3330) r10:00000000 r9:8456b000 r8:00000000 r7:84594f00 r6:00003516 r5:855e2000 r4:00000000 [<808881b4>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa49fa8 to 0xdfa49ff0) 9fa0: 00000000 00000000 00000007 00003516 00000000 00000000 9fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76b6c0bc 9fe0: 76b6bec0 76b6beb0 0001939c 00131f30 r10:000001aa r9:8456b000 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