8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=85546003, *pmd=df88c003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4712 Comm: syz.0.169 Not tainted 6.15.0-rc5-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at io_ring_buffer_select io_uring/kbuf.c:163 [inline] PC is at io_buffer_select+0x50/0x18c io_uring/kbuf.c:207 LR is at rcu_read_unlock include/linux/rcupdate.h:873 [inline] LR is at xa_load+0x68/0xa4 lib/xarray.c:1621 pc : [<80889aa8>] lr : [<81a4c134>] psr: 20000013 sp : e04b5e00 ip : e04b5dc0 fp : e04b5e1c r10: 00000040 r9 : 80000001 r8 : 00000000 r7 : e04b5e40 r6 : 00000000 r5 : 84d3e900 r4 : 855b60c0 r3 : 00000001 r2 : 00000000 r1 : 85127640 r0 : 00000000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85540740 DAC: 00000000 Register r0 information: NULL pointer Register r1 information: slab kmalloc-64 start 85127640 pointer offset 0 size 64 Register r2 information: NULL pointer Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 855b60c0 pointer offset 0 size 192 Register r5 information: slab kmalloc-2k start 84d3e800 pointer offset 256 size 2048 Register r6 information: NULL pointer Register r7 information: 2-page vmalloc region starting at 0xe04b4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r8 information: NULL pointer Register r9 information: non-slab/vmalloc memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xe04b4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xe04b4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.0.169 (pid: 4712, stack limit = 0xe04b4000) Stack: (0xe04b5e00 to 0xe04b6000) 5e00: 835abb80 855b60c0 85508b00 80000001 e04b5e84 e04b5e20 80893310 80889a64 5e20: e04b5e4c e04b5e30 8089ecc4 8050a4c4 00010001 00000001 8057abbc 00000000 5e40: 00000002 00000003 855b60c0 80000001 e04b5e84 eface6cc 80886ad8 855b60c0 5e60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 839c6000 e04b5ebc e04b5e88 5e80: 80886c70 80892fd0 855b6480 855b6540 855b6600 84d3e800 855b612c 855b60c0 5ea0: 85840000 00000000 00000000 839c6000 e04b5f14 e04b5ec0 80887840 80886c14 5ec0: 8088e1fc 81a4c0d8 e04b5f24 e04b5ed8 00000001 00000001 81cf0b5c 00000001 5ee0: 84d3e800 eface6cc 847a5180 00000000 84d3e800 00005b43 847a5180 00000000 5f00: 839c6000 00000000 e04b5fa4 e04b5f18 808882e8 80887640 ecac8b10 84d3e840 5f20: 00000000 00000000 81a4feb0 81a4fd80 e04b5f54 e04b5f40 8026b438 8029ce1c 5f40: e04b5fb0 40000000 e04b5f84 e04b5f58 802229dc 8026b3f4 00000000 8281d05c 5f60: e04b5fb0 0014c490 ecac8b10 80222930 00000000 eface6cc e04b5fac 00000000 5f80: 00000000 002e630c 000001aa 8020029c 839c6000 000001aa 00000000 e04b5fa8 5fa0: 80200060 808881bc 00000000 00000000 00000004 00005b43 00000000 00000000 5fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b680bc 5fe0: 76b67ec0 76b67eb0 0001939c 00131f30 60000010 00000004 00000000 00000000 Call trace: [<80889a58>] (io_buffer_select) from [<80893310>] (io_recv_buf_select io_uring/net.c:1098 [inline]) [<80889a58>] (io_buffer_select) from [<80893310>] (io_recv+0x34c/0x46c io_uring/net.c:1138) r7:80000001 r6:85508b00 r5:855b60c0 r4:835abb80 [<80892fc4>] (io_recv) from [<80886c70>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline]) [<80892fc4>] (io_recv) from [<80886c70>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759) r10:839c6000 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:855b60c0 [<80886c08>] (io_issue_sqe) from [<80887840>] (io_queue_sqe io_uring/io_uring.c:1975 [inline]) [<80886c08>] (io_issue_sqe) from [<80887840>] (io_submit_sqe io_uring/io_uring.c:2231 [inline]) [<80886c08>] (io_issue_sqe) from [<80887840>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2348) r10:839c6000 r9:00000000 r8:00000000 r7:85840000 r6:855b60c0 r5:855b612c r4:84d3e800 [<80887634>] (io_submit_sqes) from [<808882e8>] (__do_sys_io_uring_enter io_uring/io_uring.c:3408 [inline]) [<80887634>] (io_submit_sqes) from [<808882e8>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3342) r10:00000000 r9:839c6000 r8:00000000 r7:847a5180 r6:00005b43 r5:84d3e800 r4:00000000 [<808881b0>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe04b5fa8 to 0xe04b5ff0) 5fa0: 00000000 00000000 00000004 00005b43 00000000 00000000 5fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b680bc 5fe0: 76b67ec0 76b67eb0 0001939c 00131f30 r10:000001aa r9:839c6000 r8:8020029c r7:000001aa r6:002e630c r5:00000000 r4:00000000 Code: e3130001 0a00002f e5910000 e1d120be (e1d030be) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e3130001 tst r3, #1 4: 0a00002f beq 0xc8 8: e5910000 ldr r0, [r1] c: e1d120be ldrh r2, [r1, #14] * 10: e1d030be ldrh r3, [r0, #14] <-- trapping instruction