8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=88569003, *pmd=ee420003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 19933 Comm: syz.6.3885 Not tainted 6.15.0-rc5-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_select+0x94/0xfc io_uring/kbuf.c:310 pc : [<8088956c>] lr : [<80889be0>] psr: 20000013 sp : dfc05db0 ip : dfc05df8 fp : dfc05df4 r10: f7eeffff r9 : 00000000 r8 : 84bf0a80 r7 : 00000000 r6 : 00004040 r5 : dfc05e44 r4 : 84b45540 r3 : 00000001 r2 : 84db840c r1 : dfc05e44 r0 : 84b45540 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84bf0f40 DAC: 00000000 Register r0 information: slab io_kiocb start 84b45540 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfc04000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 84db8400 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 84b45540 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfc04000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: slab kmalloc-64 start 84bf0a80 pointer offset 0 size 64 Register r9 information: NULL pointer Register r10 information: vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfc04000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfc04000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.6.3885 (pid: 19933, stack limit = 0xdfc04000) Stack: (0xdfc05db0 to 0xdfc06000) 5da0: 81a4be34 8030cb0c 87059900 00000000 5dc0: 00000000 84db840c 00000000 84b45540 84bf0a80 00004040 00000000 dfc05e44 5de0: 87059800 f7eeffff dfc05e24 dfc05df8 80889be0 80889554 00000001 00000000 5e00: 84b45540 00004040 84db8400 80000001 00000000 f7eeffff dfc05e84 dfc05e28 5e20: 8089263c 80889b58 8089ec2c 000000e8 dfc05e5c dfc05e40 84db840c 8356e280 5e40: 84b45540 84db840c 00000000 20044080 00000001 5fb7d9f5 80886a40 84b45540 5e60: 81cf0c94 00000000 80000001 81cf0b5c 0000001a 83d53c00 dfc05ebc dfc05e88 5e80: 80886bd8 80892328 84b45540 87000000 84b45540 87059800 84b455ac 84b45540 5ea0: 87000000 00000000 00000000 83d53c00 dfc05f14 dfc05ec0 808877a8 80886b7c 5ec0: 8088e238 81a55010 dfc05f24 dfc05ed8 00000001 00000001 81cf0b5c 00000001 5ee0: 87059800 5fb7d9f5 8482a480 00000000 87059800 000027e2 8482a480 00000000 5f00: 83d53c00 00000000 dfc05fa4 dfc05f18 80888250 808875a8 ecac8b10 87059840 5f20: 00000000 00000000 81a4fbb0 81a4fa80 dfc05f54 dfc05f40 8026b438 8029ce1c 5f40: dfc05fb0 40000000 dfc05f84 dfc05f58 802229dc 8026b3f4 00000000 8281d05c 5f60: dfc05fb0 0014c490 ecac8b10 80222930 00000000 5fb7d9f5 dfc05fac 00000000 5f80: 00000000 002e63a4 000001aa 8020029c 83d53c00 000001aa 00000000 dfc05fa8 5fa0: 80200060 80888124 00000000 00000000 00000003 000027e2 00000000 00000000 5fc0: 00000000 00000000 002e63a4 000001aa 002d0000 00000000 00006364 76b3e0bc 5fe0: 76b3dec0 76b3deb0 0001939c 00131f30 60000010 00000003 00000000 00000000 Call trace: [<80889548>] (io_ring_buffers_peek) from [<80889be0>] (io_buffers_select+0x94/0xfc io_uring/kbuf.c:310) r10:f7eeffff r9:87059800 r8:dfc05e44 r7:00000000 r6:00004040 r5:84bf0a80 r4:84b45540 [<80889b4c>] (io_buffers_select) from [<8089263c>] (io_send_select_buffer io_uring/net.c:587 [inline]) [<80889b4c>] (io_buffers_select) from [<8089263c>] (io_send+0x320/0x490 io_uring/net.c:635) r10:f7eeffff r9:00000000 r8:80000001 r7:84db8400 r6:00004040 r5:84b45540 r4:00000000 r3:00000001 [<8089231c>] (io_send) from [<80886bd8>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline]) [<8089231c>] (io_send) from [<80886bd8>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759) r10:83d53c00 r9:0000001a r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0c94 r4:84b45540 [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_queue_sqe io_uring/io_uring.c:1975 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqe io_uring/io_uring.c:2231 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2348) r10:83d53c00 r9:00000000 r8:00000000 r7:87000000 r6:84b45540 r5:84b455ac r4:87059800 [<8088759c>] (io_submit_sqes) from [<80888250>] (__do_sys_io_uring_enter io_uring/io_uring.c:3408 [inline]) [<8088759c>] (io_submit_sqes) from [<80888250>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3342) r10:00000000 r9:83d53c00 r8:00000000 r7:8482a480 r6:000027e2 r5:87059800 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc05fa8 to 0xdfc05ff0) 5fa0: 00000000 00000000 00000003 000027e2 00000000 00000000 5fc0: 00000000 00000000 002e63a4 000001aa 002d0000 00000000 00006364 76b3e0bc 5fe0: 76b3dec0 76b3deb0 0001939c 00131f30 r10:000001aa r9:83d53c00 r8:8020029c r7:000001aa r6:002e63a4 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