8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=84612003, *pmd=df082003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 5000 Comm: syz.0.378 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 : dfa9dd90 ip : dfa9ddd8 fp : dfa9ddd4 r10: 00000240 r9 : 00000000 r8 : 8551abc0 r7 : 8545380c r6 : 85453800 r5 : dfa9de14 r4 : 859a5180 r3 : 00000001 r2 : 8545380c r1 : dfa9de14 r0 : 859a5180 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8551a9c0 DAC: 00000000 Register r0 information: slab io_kiocb start 859a5180 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfa9c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85453800 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 859a5180 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfa9c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 85453800 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 85453800 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 8551abc0 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 0xdfa9c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfa9c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.0.378 (pid: 5000, stack limit = 0xdfa9c000) Stack: (0xdfa9dd90 to 0xdfa9e000) dd80: 81a4c354 8030cb14 84c43100 00000001 dda0: 00010000 8545380c 00000000 859a5180 dfa9de14 85453800 8545380c 00000000 ddc0: 80000001 00000240 dfa9ddec dfa9ddd8 80889da4 80889648 8505e780 859a5180 dde0: dfa9de54 dfa9ddf0 808932d4 80889d48 00000000 dfa9ddd8 85453800 d2e3469e de00: 00010001 00000001 84c43128 00000000 00000000 8545380c 00000000 00000000 de20: 00010001 d2e3469e dfa9de54 859a5180 81cf0ca0 00000000 00000000 00000000 de40: 80000001 84870c00 dfa9de7c dfa9de58 808822b4 8089302c 859a5180 80000001 de60: 0000001b 81cf0b5c 856ef0c0 00000000 dfa9debc dfa9de80 80886d84 80882274 de80: 859a53c0 859a5480 859a5540 81cf0ca0 859a56c0 84c43000 859a51ec 859a5180 dea0: 85a60000 00000000 00000000 84870c00 dfa9df14 dfa9dec0 8088789c 80886d48 dec0: 8088e258 81a4c2f8 00000000 00000000 00000800 00000800 81cf0b5c 00000800 dee0: 84c43000 d2e3469e 856efb40 00000000 84c43000 00003516 856efb40 00000000 df00: 84870c00 00000000 dfa9dfa4 dfa9df18 80888344 8088769c ecac8b10 84c43040 df20: 00000000 00000000 81a500d0 81a4ffa0 dfa9df54 dfa9df40 8026b438 8029ce24 df40: dfa9dfb0 40000000 dfa9df84 dfa9df58 802229dc 8026b3f4 00000000 8281d05c df60: dfa9dfb0 0014c490 ecac8b10 80222930 00000000 d2e3469e dfa9dfac 00000000 df80: 00000000 002e630c 000001aa 8020029c 84870c00 000001aa 00000000 dfa9dfa8 dfa0: 80200060 80888218 00000000 00000000 00000004 00003516 00000000 00000000 dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b180bc dfe0: 76b17ec0 76b17eb0 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 r7:8545380c r6:85453800 r5:dfa9de14 r4:859a5180 [<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) r5:859a5180 r4:8505e780 [<80893020>] (io_recv) from [<808822b4>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734) r10:84870c00 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0ca0 r4:859a5180 [<80882268>] (__io_issue_sqe) from [<80886d84>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757) r9:00000000 r8:856ef0c0 r7:81cf0b5c r6:0000001b r5:80000001 r4:859a5180 [<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) r10:84870c00 r9:00000000 r8:00000000 r7:85a60000 r6:859a5180 r5:859a51ec r4:84c43000 [<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 r9:84870c00 r8:00000000 r7:856efb40 r6:00003516 r5:84c43000 r4:00000000 [<8088820c>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa9dfa8 to 0xdfa9dff0) dfa0: 00000000 00000000 00000004 00003516 00000000 00000000 dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b180bc dfe0: 76b17ec0 76b17eb0 0001939c 00131f30 r10:000001aa r9:84870c00 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