8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=85461003, *pmd=df749003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 3797 Comm: syz.1.6 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_peek+0x68/0x8c io_uring/kbuf.c:343 pc : [<8088956c>] lr : [<80889cb0>] psr: 20000013 sp : dfe71dc0 ip : dfe71e08 fp : dfe71e04 r10: 00000362 r9 : 00000000 r8 : 853f5b00 r7 : 853f2f0c r6 : 853f2f00 r5 : dfe71e44 r4 : 853f7000 r3 : 00000001 r2 : 853f2f0c r1 : dfe71e44 r0 : 853f7000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84b3d500 DAC: fffffffd Register r0 information: slab io_kiocb start 853f7000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfe70000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 853f2f00 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 853f7000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfe70000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 853f2f00 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 853f2f00 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 853f5b00 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 0xdfe70000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfe70000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.1.6 (pid: 3797, stack limit = 0xdfe70000) Stack: (0xdfe71dc0 to 0xdfe72000) 1dc0: 81a4be34 8030cb0c 84546900 00000001 00010000 853f2f0c 00000000 853f7000 1de0: dfe71e44 853f2f00 853f2f0c 00000000 80000001 00000362 dfe71e1c dfe71e08 1e00: 80889cb0 80889554 836c5400 853f7000 dfe71e84 dfe71e20 808931e0 80889c54 1e20: dfe71e4c dfe71e30 8089ec2c 8050a4c4 00010001 00000001 8057abbc 00000000 1e40: 00000000 853f2f0c 00000000 00000000 00010001 1c3fc02c 80886a40 853f7000 1e60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 852b8000 dfe71ebc dfe71e88 1e80: 80886bd8 80892f38 853f73c0 853f7480 853f7540 84546800 853f706c 853f7000 1ea0: 85500000 00000000 00000000 852b8000 dfe71f14 dfe71ec0 808877a8 80886b7c 1ec0: 8088e164 81a4bdd8 dfe71f24 dfe71ed8 00000800 00000800 81cf0b5c 00000800 1ee0: 84546800 1c3fc02c 845f6a80 00000000 84546800 00003516 845f6a80 00000000 1f00: 852b8000 00000000 dfe71fa4 dfe71f18 80888250 808875a8 ecac8b10 84546840 1f20: 00000000 00000000 81a4fbb0 81a4fa80 dfe71f54 dfe71f40 8026b438 8029ce1c 1f40: dfe71fb0 40000000 dfe71f84 dfe71f58 802229dc 8026b3f4 00000000 8281d05c 1f60: dfe71fb0 0014c490 ecac8b10 80222930 00000000 1c3fc02c dfe71fac 00000000 1f80: 00000000 002e630c 000001aa 8020029c 852b8000 000001aa 00000000 dfe71fa8 1fa0: 80200060 80888124 00000000 00000000 00000006 00003516 00000000 00000000 1fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b7f0bc 1fe0: 76b7eec0 76b7eeb0 0001939c 00131f30 60000010 00000006 00000000 00000000 Call trace: [<80889548>] (io_ring_buffers_peek) from [<80889cb0>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000362 r9:80000001 r8:00000000 r7:853f2f0c r6:853f2f00 r5:dfe71e44 r4:853f7000 [<80889c48>] (io_buffers_peek) from [<808931e0>] (io_recv_buf_select io_uring/net.c:1077 [inline]) [<80889c48>] (io_buffers_peek) from [<808931e0>] (io_recv+0x2b4/0x46c io_uring/net.c:1138) r5:853f7000 r4:836c5400 [<80892f2c>] (io_recv) from [<80886bd8>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline]) [<80892f2c>] (io_recv) from [<80886bd8>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759) r10:852b8000 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:853f7000 [<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) r10:852b8000 r9:00000000 r8:00000000 r7:85500000 r6:853f7000 r5:853f706c r4:84546800 [<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 r9:852b8000 r8:00000000 r7:845f6a80 r6:00003516 r5:84546800 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfe71fa8 to 0xdfe71ff0) 1fa0: 00000000 00000000 00000006 00003516 00000000 00000000 1fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b7f0bc 1fe0: 76b7eec0 76b7eeb0 0001939c 00131f30 r10:000001aa r9:852b8000 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