8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=8740c003, *pmd=ea5b3003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 18405 Comm: syz.8.1842 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_select+0x94/0xfc io_uring/kbuf.c:310 pc : [<8088956c>] lr : [<80889be0>] psr: 20000013 sp : dfcb1db0 ip : dfcb1df8 fp : dfcb1df4 r10: f7eeffff r9 : 00000000 r8 : 84051980 r7 : 00000000 r6 : 00004040 r5 : dfcb1e44 r4 : 8b110000 r3 : 00000001 r2 : 84ad8a0c r1 : dfcb1e44 r0 : 8b110000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 855a3ec0 DAC: 00000000 Register r0 information: slab io_kiocb start 8b110000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfcb0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 84ad8a00 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 8b110000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfcb0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: slab kmalloc-64 start 84051980 pointer offset 0 size 64 Register r9 information: NULL pointer Register r10 information: vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfcb0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfcb0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.8.1842 (pid: 18405, stack limit = 0xdfcb0000) Stack: (0xdfcb1db0 to 0xdfcb2000) 1da0: 81a4be34 8030cb0c 84f02900 00000000 1dc0: 00000000 84ad8a0c 00000000 8b110000 84051980 00004040 00000000 dfcb1e44 1de0: 84f02800 f7eeffff dfcb1e24 dfcb1df8 80889be0 80889554 00000001 00000000 1e00: 8b110000 00004040 84ad8a00 80000001 00000000 f7eeffff dfcb1e84 dfcb1e28 1e20: 8089263c 80889b58 8089ec2c 000000e8 dfcb1e5c dfcb1e40 84ad8a0c 851bf680 1e40: 8b110000 84ad8a0c 00000000 200440c0 00000001 c50c155b 80886a40 8b110000 1e60: 81cf0c94 00000000 80000001 81cf0b5c 0000001a 84a65400 dfcb1ebc dfcb1e88 1e80: 80886bd8 80892328 8b110000 8b140000 8b110000 84f02800 8b11006c 8b110000 1ea0: 8b140000 00000000 00000000 84a65400 dfcb1f14 dfcb1ec0 808877a8 80886b7c 1ec0: 8088e164 81a4bdd8 dfcb1f24 dfcb1ed8 00000001 00000001 81cf0b5c 00000001 1ee0: 84f02800 c50c155b 847fccc0 00000000 84f02800 000027e2 847fccc0 00000000 1f00: 84a65400 00000000 dfcb1fa4 dfcb1f18 80888250 808875a8 ecac8b10 84f02840 1f20: 00000000 00000000 81a4fbb0 81a4fa80 dfcb1f54 dfcb1f40 8026b438 8029ce1c 1f40: dfcb1fb0 40000000 dfcb1f84 dfcb1f58 802229dc 8026b3f4 00000000 8281d05c 1f60: dfcb1fb0 0014c490 ecac8b10 80222930 00000000 c50c155b dfcb1fac 00000000 1f80: 00000000 002e630c 000001aa 8020029c 84a65400 000001aa 00000000 dfcb1fa8 1fa0: 80200060 80888124 00000000 00000000 00000003 000027e2 00000000 00000000 1fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b180bc 1fe0: 76b17ec0 76b17eb0 0001939c 00131f30 60000010 00000003 00000000 00000000 Call trace: [<80889548>] (io_ring_buffers_peek) from [<80889be0>] (io_buffers_select+0x94/0xfc io_uring/kbuf.c:310) r10:f7eeffff r9:84f02800 r8:dfcb1e44 r7:00000000 r6:00004040 r5:84051980 r4:8b110000 [<80889b4c>] (io_buffers_select) from [<8089263c>] (io_send_select_buffer io_uring/net.c:587 [inline]) [<80889b4c>] (io_buffers_select) from [<8089263c>] (io_send+0x320/0x490 io_uring/net.c:635) r10:f7eeffff r9:00000000 r8:80000001 r7:84ad8a00 r6:00004040 r5:8b110000 r4:00000000 r3:00000001 [<8089231c>] (io_send) from [<80886bd8>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline]) [<8089231c>] (io_send) from [<80886bd8>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759) r10:84a65400 r9:0000001a r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0c94 r4:8b110000 [<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) r10:84a65400 r9:00000000 r8:00000000 r7:8b140000 r6:8b110000 r5:8b11006c r4:84f02800 [<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 r9:84a65400 r8:00000000 r7:847fccc0 r6:000027e2 r5:84f02800 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfcb1fa8 to 0xdfcb1ff0) 1fa0: 00000000 00000000 00000003 000027e2 00000000 00000000 1fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b180bc 1fe0: 76b17ec0 76b17eb0 0001939c 00131f30 r10:000001aa r9:84a65400 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