8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=85db9003, *pmd=df7f2003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 12287 Comm: syz.2.1681 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 : df9fddc0 ip : df9fde08 fp : df9fde04 r10: 00000240 r9 : 00000000 r8 : 854b5f00 r7 : 85beee0c r6 : 85beee00 r5 : df9fde44 r4 : 85d5c240 r3 : 00000001 r2 : 85beee0c r1 : df9fde44 r0 : 85d5c240 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 855753c0 DAC: fffffffd Register r0 information: slab io_kiocb start 85d5c240 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdf9fc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85beee00 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 85d5c240 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdf9fc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 85beee00 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 85beee00 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 854b5f00 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 0xdf9fc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdf9fc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.2.1681 (pid: 12287, stack limit = 0xdf9fc000) Stack: (0xdf9fddc0 to 0xdf9fe000) ddc0: 81a4be54 8030cb0c 86056900 00000001 00010000 85beee0c 00000000 85d5c240 dde0: df9fde44 85beee00 85beee0c 00000000 80000001 00000240 df9fde1c df9fde08 de00: 80889cb0 80889554 84c81680 85d5c240 df9fde84 df9fde20 808931e0 80889c54 de20: df9fde4c df9fde30 8089ec2c 8050a4c4 00010001 00000001 8057abbc 00000000 de40: 00000000 85beee0c 00000000 00000000 00010001 b8dec224 80886a40 85d5c240 de60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 84a68c00 df9fdebc df9fde88 de80: 80886bd8 80892f38 85d5c600 85d5c6c0 85d5c780 86056800 85d5c2ac 85d5c240 dea0: 858c0000 00000000 00000000 84a68c00 df9fdf14 df9fdec0 808877a8 80886b7c dec0: 8088e164 81a4bdf8 df9fdf24 df9fded8 00000800 00000800 81cf0b5c 00000800 dee0: 86056800 b8dec224 85c9c600 00000042 86056800 00003517 85c9c600 00000000 df00: 84a68c00 00000000 df9fdfa4 df9fdf18 80888250 808875a8 ecac8b10 86056840 df20: 00000000 0000173d 81a4fbd0 81a4faa0 df9fdf54 df9fdf40 8026b438 8029ce1c df40: df9fdfb0 40000000 df9fdf84 df9fdf58 802229dc 8026b3f4 00000000 8281d05c df60: df9fdfb0 0014c490 ecac8b10 80222930 00000000 b8dec224 df9fdfac 00000000 df80: 00000000 002e63a4 000001aa 8020029c 84a68c00 000001aa 00000000 df9fdfa8 dfa0: 80200060 80888124 00000000 00000000 00000006 00003517 0000173d 00000042 dfc0: 00000000 00000000 002e63a4 000001aa 002d0000 00000000 00006364 76b430bc dfe0: 76b42ec0 76b42eb0 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) r10:00000240 r9:80000001 r8:00000000 r7:85beee0c r6:85beee00 r5:df9fde44 r4:85d5c240 [<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) r5:85d5c240 r4:84c81680 [<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) r10:84a68c00 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:85d5c240 [<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) r10:84a68c00 r9:00000000 r8:00000000 r7:858c0000 r6:85d5c240 r5:85d5c2ac r4:86056800 [<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 r9:84a68c00 r8:00000000 r7:85c9c600 r6:00003517 r5:86056800 r4:00000042 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9fdfa8 to 0xdf9fdff0) dfa0: 00000000 00000000 00000006 00003517 0000173d 00000042 dfc0: 00000000 00000000 002e63a4 000001aa 002d0000 00000000 00006364 76b430bc dfe0: 76b42ec0 76b42eb0 0001939c 00131f30 r10:000001aa r9:84a68c00 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