8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=8573e003, *pmd=df281003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 10995 Comm: syz.0.1725 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 : [<808896b0>] lr : [<80889df4>] psr: 20000013 sp : dffd5d90 ip : dffd5dd8 fp : dffd5dd4 r10: 00000362 r9 : 00000000 r8 : 85408000 r7 : 854cd20c r6 : 854cd200 r5 : dffd5e14 r4 : 84ac7000 r3 : 00000001 r2 : 854cd20c r1 : dffd5e14 r0 : 84ac7000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85408c40 DAC: 00000000 Register r0 information: slab io_kiocb start 84ac7000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdffd4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 854cd200 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 84ac7000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdffd4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 854cd200 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 854cd200 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 85408000 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 0xdffd4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdffd4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.0.1725 (pid: 10995, stack limit = 0xdffd4000) Stack: (0xdffd5d90 to 0xdffd6000) 5d80: 81a4c394 8030cb14 849ab100 00000001 5da0: 00010000 854cd20c 00000000 84ac7000 dffd5e14 854cd200 854cd20c 00000000 5dc0: 80000001 00000362 dffd5dec dffd5dd8 80889df4 80889698 8361a500 84ac7000 5de0: dffd5e54 dffd5df0 80893324 80889d98 00000000 dffd5dd8 854cd200 b2b3aadb 5e00: 00010001 00000001 849ab128 00000000 00000000 854cd20c 00000000 00000000 5e20: 00010001 b2b3aadb dffd5e54 84ac7000 81cf0ca0 00000000 00000000 00000000 5e40: 80000001 84f10c00 dffd5e7c dffd5e58 80882304 8089307c 84ac7000 80000001 5e60: 0000001b 81cf0b5c 84731000 00000000 dffd5ebc dffd5e80 80886dd4 808822c4 5e80: 84ac7240 84ac7300 84ac73c0 81cf0ca0 84ac7540 849ab000 84ac706c 84ac7000 5ea0: 85800000 00000000 00000000 84f10c00 dffd5f14 dffd5ec0 808878ec 80886d98 5ec0: 8088e2a8 81a4c338 dffd5f24 dffd5ed8 00000800 00000800 81cf0b5c 00000800 5ee0: 849ab000 b2b3aadb 847316c0 00000000 849ab000 00003516 847316c0 00000000 5f00: 84f10c00 00000000 dffd5fa4 dffd5f18 80888394 808876ec ecac8b10 849ab040 5f20: 00000000 00000000 81a50110 81a4ffe0 dffd5f54 dffd5f40 8026b438 8029ce24 5f40: dffd5fb0 40000000 dffd5f84 dffd5f58 802229dc 8026b3f4 00000000 8281d05c 5f60: dffd5fb0 0014c490 ecac8b10 80222930 00000000 b2b3aadb dffd5fac 00000000 5f80: 00000000 002e630c 000001aa 8020029c 84f10c00 000001aa 00000000 dffd5fa8 5fa0: 80200060 80888268 00000000 00000000 00000005 00003516 00000000 00000000 5fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b070bc 5fe0: 76b06ec0 76b06eb0 0001939c 00131f30 60000010 00000005 00000000 00000000 Call trace: [<8088968c>] (io_ring_buffers_peek) from [<80889df4>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000362 r9:80000001 r8:00000000 r7:854cd20c r6:854cd200 r5:dffd5e14 r4:84ac7000 [<80889d8c>] (io_buffers_peek) from [<80893324>] (io_recv_buf_select io_uring/net.c:1077 [inline]) [<80889d8c>] (io_buffers_peek) from [<80893324>] (io_recv+0x2b4/0x46c io_uring/net.c:1138) r5:84ac7000 r4:8361a500 [<80893070>] (io_recv) from [<80882304>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734) r10:84f10c00 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0ca0 r4:84ac7000 [<808822b8>] (__io_issue_sqe) from [<80886dd4>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757) r9:00000000 r8:84731000 r7:81cf0b5c r6:0000001b r5:80000001 r4:84ac7000 [<80886d8c>] (io_issue_sqe) from [<808878ec>] (io_queue_sqe io_uring/io_uring.c:1963 [inline]) [<80886d8c>] (io_issue_sqe) from [<808878ec>] (io_submit_sqe io_uring/io_uring.c:2219 [inline]) [<80886d8c>] (io_issue_sqe) from [<808878ec>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2336) r10:84f10c00 r9:00000000 r8:00000000 r7:85800000 r6:84ac7000 r5:84ac706c r4:849ab000 [<808876e0>] (io_submit_sqes) from [<80888394>] (__do_sys_io_uring_enter io_uring/io_uring.c:3396 [inline]) [<808876e0>] (io_submit_sqes) from [<80888394>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3330) r10:00000000 r9:84f10c00 r8:00000000 r7:847316c0 r6:00003516 r5:849ab000 r4:00000000 [<8088825c>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdffd5fa8 to 0xdffd5ff0) 5fa0: 00000000 00000000 00000005 00003516 00000000 00000000 5fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b070bc 5fe0: 76b06ec0 76b06eb0 0001939c 00131f30 r10:000001aa r9:84f10c00 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