8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=8b0af003, *pmd=e9c1f003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 20444 Comm: syz.2.1489 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 : e008dd90 ip : e008ddd8 fp : e008ddd4 r10: 00000240 r9 : 00000000 r8 : 850e2e80 r7 : 8524580c r6 : 85245800 r5 : e008de14 r4 : 896ad600 r3 : 00000001 r2 : 8524580c r1 : e008de14 r0 : 896ad600 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 855dcd00 DAC: 00000000 Register r0 information: slab io_kiocb start 896ad600 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xe008c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85245800 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 896ad600 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xe008c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 85245800 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 85245800 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 850e2e80 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 0xe008c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xe008c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.2.1489 (pid: 20444, stack limit = 0xe008c000) Stack: (0xe008dd90 to 0xe008e000) dd80: 81a4c0b4 8030cb14 8513e900 00000001 dda0: 00010000 8524580c 00000000 896ad600 e008de14 85245800 8524580c 00000000 ddc0: 80000001 00000240 e008ddec e008ddd8 80889c3c 808894e0 84c7b900 896ad600 dde0: e008de54 e008ddf0 8089316c 80889be0 e008de6c e008de00 85245800 674ffc6b de00: 00010001 00000001 8513e928 00000000 00000000 8524580c 00000000 00000000 de20: 00010001 674ffc6b e008de54 896ad600 81cf0ca0 00000000 00000000 00000000 de40: 80000001 87366c00 e008de7c e008de58 8088214c 80892ec4 896ad600 80000001 de60: 0000001b 81cf0b5c 87a380c0 00000000 e008debc e008de80 80886c1c 8088210c de80: 896ad840 896ad900 896ad9c0 81cf0ca0 896adb40 8513e800 896ad66c 896ad600 dea0: 894e0000 00000000 00000000 87366c00 e008df14 e008dec0 80887734 80886be0 dec0: 8088e0f0 81a4c058 00000000 00000000 00000800 00000800 81cf0b5c 00000800 dee0: 8513e800 674ffc6b 87a38780 00000000 8513e800 00003516 87a38780 00000000 df00: 87366c00 00000000 e008dfa4 e008df18 808881dc 80887534 ecac8b10 8513e840 df20: 00000000 00000000 81a4fe30 81a4fd00 e008df54 e008df40 8026b438 8029ce24 df40: e008dfb0 40000000 e008df84 e008df58 802229dc 8026b3f4 00000000 8281d05c df60: e008dfb0 0014c490 ecac8b10 80222930 00000000 674ffc6b e008dfac 00000000 df80: 00000000 002e643c 000001aa 8020029c 87366c00 000001aa 00000000 e008dfa8 dfa0: 80200060 808880b0 00000000 00000000 00000006 00003516 00000000 00000000 dfc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76b820bc dfe0: 76b81ec0 76b81eb0 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 r7:8524580c r6:85245800 r5:e008de14 r4:896ad600 [<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) r5:896ad600 r4:84c7b900 [<80892eb8>] (io_recv) from [<8088214c>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734) r10:87366c00 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0ca0 r4:896ad600 [<80882100>] (__io_issue_sqe) from [<80886c1c>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757) r9:00000000 r8:87a380c0 r7:81cf0b5c r6:0000001b r5:80000001 r4:896ad600 [<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) r10:87366c00 r9:00000000 r8:00000000 r7:894e0000 r6:896ad600 r5:896ad66c r4:8513e800 [<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 r9:87366c00 r8:00000000 r7:87a38780 r6:00003516 r5:8513e800 r4:00000000 [<808880a4>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe008dfa8 to 0xe008dff0) dfa0: 00000000 00000000 00000006 00003516 00000000 00000000 dfc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76b820bc dfe0: 76b81ec0 76b81eb0 0001939c 00131f30 r10:000001aa r9:87366c00 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