8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=8561f003, *pmd=e153a003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 13969 Comm: syz.0.1728 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 : e0039dc0 ip : e0039e08 fp : e0039e04 r10: 00000240 r9 : 00000000 r8 : 85dd1540 r7 : 85f4480c r6 : 85f44800 r5 : e0039e44 r4 : 8616f000 r3 : 00000001 r2 : 85f4480c r1 : e0039e44 r0 : 8616f000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85879540 DAC: 00000000 Register r0 information: slab io_kiocb start 8616f000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xe0038000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85f44800 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 8616f000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xe0038000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 85f44800 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 85f44800 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 85dd1540 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 0xe0038000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xe0038000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.0.1728 (pid: 13969, stack limit = 0xe0038000) Stack: (0xe0039dc0 to 0xe003a000) 9dc0: 81a4be34 8030cb0c 86299900 00000001 00010000 85f4480c 00000000 8616f000 9de0: e0039e44 85f44800 85f4480c 00000000 80000001 00000240 e0039e1c e0039e08 9e00: 80889cb0 80889554 84d18000 8616f000 e0039e84 e0039e20 808931e0 80889c54 9e20: e0039e4c e0039e30 8089ec2c 8050a4c4 00010001 00000001 8057abbc 00000000 9e40: 00000000 85f4480c 00000000 00000000 00010001 519a5248 80886a40 8616f000 9e60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 861a1800 e0039ebc e0039e88 9e80: 80886bd8 80892f38 8616f3c0 8616f480 8616f540 86299800 8616f06c 8616f000 9ea0: 86680000 00000000 00000000 861a1800 e0039f14 e0039ec0 808877a8 80886b7c 9ec0: 8088e164 81a4bdd8 00000000 00000000 00000800 00000800 81cf0b5c 00000800 9ee0: 86299800 519a5248 83b82000 00000000 86299800 00003516 83b82000 00000000 9f00: 861a1800 00000000 e0039fa4 e0039f18 80888250 808875a8 ecac8b10 86299840 9f20: 00000000 00000000 81a4fbb0 81a4fa80 e0039f54 e0039f40 8026b438 8029ce1c 9f40: e0039fb0 40000000 e0039f84 e0039f58 802229dc 8026b3f4 00000000 8281d05c 9f60: e0039fb0 0014c490 ecac8b10 80222930 00000000 519a5248 e0039fac 00000000 9f80: 00000000 002e643c 000001aa 8020029c 861a1800 000001aa 00000000 e0039fa8 9fa0: 80200060 80888124 00000000 00000000 00000006 00003516 00000000 00000000 9fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76adb0bc 9fe0: 76adaec0 76adaeb0 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 r7:85f4480c r6:85f44800 r5:e0039e44 r4:8616f000 [<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) r5:8616f000 r4:84d18000 [<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) r10:861a1800 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:8616f000 [<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) r10:861a1800 r9:00000000 r8:00000000 r7:86680000 r6:8616f000 r5:8616f06c r4:86299800 [<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 r9:861a1800 r8:00000000 r7:83b82000 r6:00003516 r5:86299800 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0039fa8 to 0xe0039ff0) 9fa0: 00000000 00000000 00000006 00003516 00000000 00000000 9fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76adb0bc 9fe0: 76adaec0 76adaeb0 0001939c 00131f30 r10:000001aa r9:861a1800 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