8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=8561b003, *pmd=e0075003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 23209 Comm: syz.1.5023 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 : dfd79e00 ip : dfd79dc0 fp : dfd79e1c r10: 00000240 r9 : 80000001 r8 : 00000000 r7 : dfd79e40 r6 : 00000000 r5 : 84a68100 r4 : 84a9b000 r3 : 00000001 r2 : 00000000 r1 : 8560d680 r0 : 00000000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8534c600 DAC: 00000000 Register r0 information: NULL pointer Register r1 information: slab kmalloc-64 start 8560d680 pointer offset 0 size 64 Register r2 information: NULL pointer Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 84a9b000 pointer offset 0 size 192 Register r5 information: slab kmalloc-2k start 84a68000 pointer offset 256 size 2048 Register r6 information: NULL pointer Register r7 information: 2-page vmalloc region starting at 0xdfd78000 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 0xdfd78000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfd78000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.1.5023 (pid: 23209, stack limit = 0xdfd78000) Stack: (0xdfd79e00 to 0xdfd7a000) 9e00: 84c55900 84a9b000 85382800 80000001 dfd79e84 dfd79e20 80893310 80889a64 9e20: dfd79e4c dfd79e30 8089ecc4 8050a4c4 00010001 00000001 8057abbc 00000000 9e40: 00000000 00000005 84a9b000 80000001 dfd79e84 a5240530 80886ad8 84a9b000 9e60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 832e3c00 dfd79ebc dfd79e88 9e80: 80886c70 80892fd0 84a9b3c0 84a9b480 84a9b540 84a68000 84a9b06c 84a9b000 9ea0: 85960000 00000000 00000000 832e3c00 dfd79f14 dfd79ec0 80887840 80886c14 9ec0: 8088e1fc 81a4c0d8 dfd79f24 dfd79ed8 00000800 00000800 81cf0b5c 00000800 9ee0: 84a68000 a5240530 85508b40 00000000 84a68000 00003516 85508b40 00000000 9f00: 832e3c00 00000000 dfd79fa4 dfd79f18 808882e8 80887640 ecac8b10 84a68040 9f20: 00000000 00000000 81a4feb0 81a4fd80 dfd79f54 dfd79f40 8026b438 8029ce1c 9f40: dfd79fb0 40000000 dfd79f84 dfd79f58 802229dc 8026b3f4 00000000 8281d05c 9f60: dfd79fb0 0014c490 ecac8b10 80222930 00000000 a5240530 dfd79fac 00000000 9f80: 00000000 002e630c 000001aa 8020029c 832e3c00 000001aa 00000000 dfd79fa8 9fa0: 80200060 808881bc 00000000 00000000 00000006 00003516 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b130bc 9fe0: 76b12ec0 76b12eb0 0001939c 00131f30 60000010 00000006 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 r6:85382800 r5:84a9b000 r4:84c55900 [<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) r10:832e3c00 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:84a9b000 [<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) r10:832e3c00 r9:00000000 r8:00000000 r7:85960000 r6:84a9b000 r5:84a9b06c r4:84a68000 [<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 r9:832e3c00 r8:00000000 r7:85508b40 r6:00003516 r5:84a68000 r4:00000000 [<808881b0>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfd79fa8 to 0xdfd79ff0) 9fa0: 00000000 00000000 00000006 00003516 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b130bc 9fe0: 76b12ec0 76b12eb0 0001939c 00131f30 r10:000001aa r9:832e3c00 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