8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=852e1003, *pmd=df2bc003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 1955 Comm: syz.0.6708 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 : [<80889608>] lr : [<80889d4c>] psr: 20000013 sp : dfacdd90 ip : dfacddd8 fp : dfacddd4 r10: 00000060 r9 : 00000000 r8 : 84ae2180 r7 : 84821e0c r6 : 84821e00 r5 : dfacde14 r4 : 85757000 r3 : 00000001 r2 : 84821e0c r1 : dfacde14 r0 : 85757000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85472e40 DAC: 00000000 Register r0 information: slab io_kiocb start 85757000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfacc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 84821e00 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 85757000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfacc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 84821e00 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 84821e00 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 84ae2180 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 0xdfacc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfacc000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.0.6708 (pid: 1955, stack limit = 0xdfacc000) Stack: (0xdfacdd90 to 0xdface000) dd80: 81a4c2d4 8030cb14 8446f100 00000001 dda0: 00010000 84821e0c 00000000 85757000 dfacde14 84821e00 84821e0c 00000000 ddc0: 80000001 00000060 dfacddec dfacddd8 80889d4c 808895f0 837dd900 85757000 dde0: dfacde54 dfacddf0 8089327c 80889cf0 00000000 dfacddd8 84821e00 40c14c76 de00: 00010001 00000001 8446f128 00000000 00000000 84821e0c 00000000 00000000 de20: 00010001 40c14c76 dfacde54 85757000 81cf0ca0 00000000 00000000 00000000 de40: 80000001 84175400 dfacde7c dfacde58 8088225c 80892fd4 85757000 80000001 de60: 0000001b 81cf0b5c 85477cc0 00000000 dfacdebc dfacde80 80886d2c 8088221c de80: 85757240 85757300 857573c0 81cf0ca0 85757540 8446f000 8575706c 85757000 dea0: 856e0000 00000000 00000000 84175400 dfacdf14 dfacdec0 80887844 80886cf0 dec0: 8088e2d4 81a554b0 00000000 00000000 00000800 00000800 81cf0b5c 00000800 dee0: 8446f000 40c14c76 85477600 00000042 8446f000 00003517 85477600 00000000 df00: 84175400 00000000 dfacdfa4 dfacdf18 808882ec 80887644 ecac8b10 8446f040 df20: 00000000 0000173d 81a50050 81a4ff20 dfacdf54 dfacdf40 8026b438 8029ce24 df40: dfacdfb0 40000000 dfacdf84 dfacdf58 802229dc 8026b3f4 00000000 8281d05c df60: dfacdfb0 0014c490 ecac8b10 80222930 00000000 40c14c76 dfacdfac 00000000 df80: 00000000 002e64d4 000001aa 8020029c 84175400 000001aa 00000000 dfacdfa8 dfa0: 80200060 808881c0 00000000 00000000 00000007 00003517 0000173d 00000042 dfc0: 00000000 00000000 002e64d4 000001aa 002d0000 00000000 00006364 76b3d0bc dfe0: 76b3cec0 76b3ceb0 0001939c 00131f30 60000010 00000007 00000000 00000000 Call trace: [<808895e4>] (io_ring_buffers_peek) from [<80889d4c>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000060 r9:80000001 r8:00000000 r7:84821e0c r6:84821e00 r5:dfacde14 r4:85757000 [<80889ce4>] (io_buffers_peek) from [<8089327c>] (io_recv_buf_select io_uring/net.c:1077 [inline]) [<80889ce4>] (io_buffers_peek) from [<8089327c>] (io_recv+0x2b4/0x46c io_uring/net.c:1138) r5:85757000 r4:837dd900 [<80892fc8>] (io_recv) from [<8088225c>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734) r10:84175400 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0ca0 r4:85757000 [<80882210>] (__io_issue_sqe) from [<80886d2c>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757) r9:00000000 r8:85477cc0 r7:81cf0b5c r6:0000001b r5:80000001 r4:85757000 [<80886ce4>] (io_issue_sqe) from [<80887844>] (io_queue_sqe io_uring/io_uring.c:1963 [inline]) [<80886ce4>] (io_issue_sqe) from [<80887844>] (io_submit_sqe io_uring/io_uring.c:2219 [inline]) [<80886ce4>] (io_issue_sqe) from [<80887844>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2336) r10:84175400 r9:00000000 r8:00000000 r7:856e0000 r6:85757000 r5:8575706c r4:8446f000 [<80887638>] (io_submit_sqes) from [<808882ec>] (__do_sys_io_uring_enter io_uring/io_uring.c:3396 [inline]) [<80887638>] (io_submit_sqes) from [<808882ec>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3330) r10:00000000 r9:84175400 r8:00000000 r7:85477600 r6:00003517 r5:8446f000 r4:00000042 [<808881b4>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfacdfa8 to 0xdfacdff0) dfa0: 00000000 00000000 00000007 00003517 0000173d 00000042 dfc0: 00000000 00000000 002e64d4 000001aa 002d0000 00000000 00006364 76b3d0bc dfe0: 76b3cec0 76b3ceb0 0001939c 00131f30 r10:000001aa r9:84175400 r8:8020029c r7:000001aa r6:002e64d4 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