8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=857ec003, *pmd=df78b003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4207 Comm: syz.0.74 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 : [<80889660>] lr : [<80889da4>] psr: 20000013 sp : dfdedd90 ip : dfdeddd8 fp : dfdeddd4 r10: 00000240 r9 : 00000000 r8 : 8555f4c0 r7 : 855dcb0c r6 : 855dcb00 r5 : dfdede14 r4 : 8579e000 r3 : 00000001 r2 : 855dcb0c r1 : dfdede14 r0 : 8579e000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 850de440 DAC: fffffffd Register r0 information: slab io_kiocb start 8579e000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfdec000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 855dcb00 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 8579e000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfdec000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 855dcb00 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 855dcb00 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 8555f4c0 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 0xdfdec000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfdec000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.0.74 (pid: 4207, stack limit = 0xdfdec000) Stack: (0xdfdedd90 to 0xdfdee000) dd80: 81a4c354 8030cb14 84c17100 00000001 dda0: 00010000 855dcb0c 00000000 8579e000 dfdede14 855dcb00 855dcb0c 00000000 ddc0: 80000001 00000240 dfdeddec dfdeddd8 80889da4 80889648 83638000 8579e000 dde0: dfdede54 dfdeddf0 808932d4 80889d48 00000000 dfdeddd8 855dcb00 4f55579a de00: 00010001 00000001 84c17128 00000000 00000000 855dcb0c 00000000 00000000 de20: 00010001 4f55579a dfdede54 8579e000 81cf0ca0 00000000 00000000 00000000 de40: 80000001 85241800 dfdede7c dfdede58 808822b4 8089302c 8579e000 80000001 de60: 0000001b 81cf0b5c 85799840 00000000 dfdedebc dfdede80 80886d84 80882274 de80: 8579e240 8579e300 8579e3c0 81cf0ca0 8579e540 84c17000 8579e06c 8579e000 dea0: 85660000 00000000 00000000 85241800 dfdedf14 dfdedec0 8088789c 80886d48 dec0: 8088e258 81a4c2f8 00000000 00000000 00000800 00000800 81cf0b5c 00000800 dee0: 84c17000 4f55579a 85799c00 00000000 84c17000 00003516 85799c00 00000000 df00: 85241800 00000000 dfdedfa4 dfdedf18 80888344 8088769c ecac8b10 84c17040 df20: 00000000 00000000 81a500d0 81a4ffa0 dfdedf54 dfdedf40 8026b438 8029ce24 df40: dfdedfb0 40000000 dfdedf84 dfdedf58 802229dc 8026b3f4 00000000 8281d05c df60: dfdedfb0 0014c490 ecac8b10 80222930 00000000 4f55579a dfdedfac 00000000 df80: 00000000 002e630c 000001aa 8020029c 85241800 000001aa 00000000 dfdedfa8 dfa0: 80200060 80888218 00000000 00000000 00000004 00003516 00000000 00000000 dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b710bc dfe0: 76b70ec0 76b70eb0 0001939c 00131f30 60000010 00000004 00000000 00000000 Call trace: [<8088963c>] (io_ring_buffers_peek) from [<80889da4>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000240 r9:80000001 r8:00000000 r7:855dcb0c r6:855dcb00 r5:dfdede14 r4:8579e000 [<80889d3c>] (io_buffers_peek) from [<808932d4>] (io_recv_buf_select io_uring/net.c:1077 [inline]) [<80889d3c>] (io_buffers_peek) from [<808932d4>] (io_recv+0x2b4/0x46c io_uring/net.c:1138) r5:8579e000 r4:83638000 [<80893020>] (io_recv) from [<808822b4>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734) r10:85241800 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0ca0 r4:8579e000 [<80882268>] (__io_issue_sqe) from [<80886d84>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757) r9:00000000 r8:85799840 r7:81cf0b5c r6:0000001b r5:80000001 r4:8579e000 [<80886d3c>] (io_issue_sqe) from [<8088789c>] (io_queue_sqe io_uring/io_uring.c:1963 [inline]) [<80886d3c>] (io_issue_sqe) from [<8088789c>] (io_submit_sqe io_uring/io_uring.c:2219 [inline]) [<80886d3c>] (io_issue_sqe) from [<8088789c>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2336) r10:85241800 r9:00000000 r8:00000000 r7:85660000 r6:8579e000 r5:8579e06c r4:84c17000 [<80887690>] (io_submit_sqes) from [<80888344>] (__do_sys_io_uring_enter io_uring/io_uring.c:3396 [inline]) [<80887690>] (io_submit_sqes) from [<80888344>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3330) r10:00000000 r9:85241800 r8:00000000 r7:85799c00 r6:00003516 r5:84c17000 r4:00000000 [<8088820c>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfdedfa8 to 0xdfdedff0) dfa0: 00000000 00000000 00000004 00003516 00000000 00000000 dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b710bc dfe0: 76b70ec0 76b70eb0 0001939c 00131f30 r10:000001aa r9:85241800 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