8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=85824003, *pmd=df8f8003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 10525 Comm: syz.0.604 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 : [<808894f8>] lr : [<80889c3c>] psr: 20000013 sp : dfe61d90 ip : dfe61dd8 fp : dfe61dd4 r10: 00000240 r9 : 00000000 r8 : 8456c940 r7 : 85346c0c r6 : 85346c00 r5 : dfe61e14 r4 : 85619000 r3 : 00000001 r2 : 85346c0c r1 : dfe61e14 r0 : 85619000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 846b8c80 DAC: fffffffd Register r0 information: slab io_kiocb start 85619000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfe60000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85346c00 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 85619000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfe60000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 85346c00 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 85346c00 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 8456c940 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 0xdfe60000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfe60000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.0.604 (pid: 10525, stack limit = 0xdfe60000) Stack: (0xdfe61d90 to 0xdfe62000) 1d80: 81a4c0b4 8030cb14 8a951900 00000001 1da0: 00010000 85346c0c 00000000 85619000 dfe61e14 85346c00 85346c0c 00000000 1dc0: 80000001 00000240 dfe61dec dfe61dd8 80889c3c 808894e0 837d8780 85619000 1de0: dfe61e54 dfe61df0 8089316c 80889be0 80892eb8 00000013 dfe61e7c dfe61e08 1e00: 00010001 00000001 85619000 00000000 00000000 85346c0c 00000000 00000000 1e20: 00010001 3591dd71 00000000 85619000 81cf0ca0 00000000 00000000 00000000 1e40: 80000001 84c9bc00 dfe61e7c dfe61e58 8088214c 80892ec4 85619000 80000001 1e60: 0000001b 81cf0b5c 85157600 00000000 dfe61ebc dfe61e80 80886c1c 8088210c 1e80: 85619240 85619300 856193c0 81cf0ca0 85619540 8a951800 8561906c 85619000 1ea0: 86260000 00000000 00000000 84c9bc00 dfe61f14 dfe61ec0 80887734 80886be0 1ec0: 8088e0f0 81a4c058 dfe61f24 dfe61ed8 00000800 00000800 81cf0b5c 00000800 1ee0: 8a951800 3591dd71 85157780 00000000 8a951800 00003516 85157780 00000000 1f00: 84c9bc00 00000000 dfe61fa4 dfe61f18 808881dc 80887534 ecac8b10 8a951840 1f20: 00000000 00000000 81a4fe30 81a4fd00 dfe61f54 dfe61f40 8026b438 8029ce24 1f40: dfe61fb0 40000000 dfe61f84 dfe61f58 802229dc 8026b3f4 00000000 8281d05c 1f60: dfe61fb0 0014c490 ecac8b10 80222930 00000000 3591dd71 dfe61fac 00000000 1f80: 00000000 002e643c 000001aa 8020029c 84c9bc00 000001aa 00000000 dfe61fa8 1fa0: 80200060 808880b0 00000000 00000000 00000006 00003516 00000000 00000000 1fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76b720bc 1fe0: 76b71ec0 76b71eb0 0001939c 00131f30 60000010 00000006 00000000 00000000 Call trace: [<808894d4>] (io_ring_buffers_peek) from [<80889c3c>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000240 r9:80000001 r8:00000000 r7:85346c0c r6:85346c00 r5:dfe61e14 r4:85619000 [<80889bd4>] (io_buffers_peek) from [<8089316c>] (io_recv_buf_select io_uring/net.c:1077 [inline]) [<80889bd4>] (io_buffers_peek) from [<8089316c>] (io_recv+0x2b4/0x46c io_uring/net.c:1138) r5:85619000 r4:837d8780 [<80892eb8>] (io_recv) from [<8088214c>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734) r10:84c9bc00 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0ca0 r4:85619000 [<80882100>] (__io_issue_sqe) from [<80886c1c>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757) r9:00000000 r8:85157600 r7:81cf0b5c r6:0000001b r5:80000001 r4:85619000 [<80886bd4>] (io_issue_sqe) from [<80887734>] (io_queue_sqe io_uring/io_uring.c:1963 [inline]) [<80886bd4>] (io_issue_sqe) from [<80887734>] (io_submit_sqe io_uring/io_uring.c:2219 [inline]) [<80886bd4>] (io_issue_sqe) from [<80887734>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2336) r10:84c9bc00 r9:00000000 r8:00000000 r7:86260000 r6:85619000 r5:8561906c r4:8a951800 [<80887528>] (io_submit_sqes) from [<808881dc>] (__do_sys_io_uring_enter io_uring/io_uring.c:3396 [inline]) [<80887528>] (io_submit_sqes) from [<808881dc>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3330) r10:00000000 r9:84c9bc00 r8:00000000 r7:85157780 r6:00003516 r5:8a951800 r4:00000000 [<808880a4>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfe61fa8 to 0xdfe61ff0) 1fa0: 00000000 00000000 00000006 00003516 00000000 00000000 1fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76b720bc 1fe0: 76b71ec0 76b71eb0 0001939c 00131f30 r10:000001aa r9:84c9bc00 r8:8020029c r7:000001aa r6:002e643c 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