8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=85891003, *pmd=df7a6003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 8946 Comm: syz.0.1192 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 : df991d90 ip : df991dd8 fp : df991dd4 r10: 00000362 r9 : 00000000 r8 : 8588e100 r7 : 8594500c r6 : 85945000 r5 : df991e14 r4 : 85944000 r3 : 00000001 r2 : 8594500c r1 : df991e14 r0 : 85944000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 855a3680 DAC: 00000000 Register r0 information: slab io_kiocb start 85944000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdf990000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85945000 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 85944000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdf990000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 85945000 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 85945000 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 8588e100 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 0xdf990000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdf990000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.0.1192 (pid: 8946, stack limit = 0xdf990000) Stack: (0xdf991d90 to 0xdf992000) 1d80: 81a4c2d4 8030cb14 844e6100 00000001 1da0: 00010000 8594500c 00000000 85944000 df991e14 85945000 8594500c 00000000 1dc0: 80000001 00000362 df991dec df991dd8 80889d4c 808895f0 83639400 85944000 1de0: df991e54 df991df0 8089327c 80889cf0 00000000 df991dd8 85945000 cc8a3d55 1e00: 00010001 00000001 844e6128 00000000 00000000 8594500c 00000000 00000000 1e20: 00010001 cc8a3d55 df991e54 85944000 81cf0ca0 00000000 00000000 00000000 1e40: 80000001 8580a400 df991e7c df991e58 8088225c 80892fd4 85944000 80000001 1e60: 0000001b 81cf0b5c 855059c0 00000000 df991ebc df991e80 80886d2c 8088221c 1e80: 85944240 85944300 859443c0 81cf0ca0 85944540 844e6000 8594406c 85944000 1ea0: 85900000 00000000 00000000 8580a400 df991f14 df991ec0 80887844 80886cf0 1ec0: 8088e200 81a4c278 00000000 00000000 00000800 00000800 81cf0b5c 00000800 1ee0: 844e6000 cc8a3d55 85505600 00000000 844e6000 00003516 85505600 00000000 1f00: 8580a400 00000000 df991fa4 df991f18 808882ec 80887644 ecac8b10 844e6040 1f20: 00000000 00000000 81a50050 81a4ff20 df991f54 df991f40 8026b438 8029ce24 1f40: df991fb0 40000000 df991f84 df991f58 802229dc 8026b3f4 00000000 8281d05c 1f60: df991fb0 0014c490 ecac8b10 80222930 00000000 cc8a3d55 df991fac 00000000 1f80: 00000000 002e630c 000001aa 8020029c 8580a400 000001aa 00000000 df991fa8 1fa0: 80200060 808881c0 00000000 00000000 00000005 00003516 00000000 00000000 1fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bd20bc 1fe0: 76bd1ec0 76bd1eb0 0001939c 00131f30 60000010 00000005 00000000 00000000 Call trace: [<808895e4>] (io_ring_buffers_peek) from [<80889d4c>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000362 r9:80000001 r8:00000000 r7:8594500c r6:85945000 r5:df991e14 r4:85944000 [<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) r5:85944000 r4:83639400 [<80892fc8>] (io_recv) from [<8088225c>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734) r10:8580a400 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0ca0 r4:85944000 [<80882210>] (__io_issue_sqe) from [<80886d2c>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757) r9:00000000 r8:855059c0 r7:81cf0b5c r6:0000001b r5:80000001 r4:85944000 [<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) r10:8580a400 r9:00000000 r8:00000000 r7:85900000 r6:85944000 r5:8594406c r4:844e6000 [<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 r9:8580a400 r8:00000000 r7:85505600 r6:00003516 r5:844e6000 r4:00000000 [<808881b4>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf991fa8 to 0xdf991ff0) 1fa0: 00000000 00000000 00000005 00003516 00000000 00000000 1fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bd20bc 1fe0: 76bd1ec0 76bd1eb0 0001939c 00131f30 r10:000001aa r9:8580a400 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