8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=8550a003, *pmd=dfb12003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4894 Comm: syz.1.239 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 : dfd09dc0 ip : dfd09e08 fp : dfd09e04 r10: 00000362 r9 : 00000000 r8 : 855c5600 r7 : 8549e00c r6 : 8549e000 r5 : dfd09e44 r4 : 856c7000 r3 : 00000001 r2 : 8549e00c r1 : dfd09e44 r0 : 856c7000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84f8a900 DAC: fffffffd Register r0 information: slab io_kiocb start 856c7000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfd08000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 8549e000 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 856c7000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfd08000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 8549e000 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 8549e000 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 855c5600 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 0xdfd08000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfd08000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.1.239 (pid: 4894, stack limit = 0xdfd08000) Stack: (0xdfd09dc0 to 0xdfd0a000) 9dc0: 81a4be54 8030cb0c 8548a100 00000001 00010000 8549e00c 00000000 856c7000 9de0: dfd09e44 8549e000 8549e00c 00000000 80000001 00000362 dfd09e1c dfd09e08 9e00: 80889cb0 80889554 8503ec80 856c7000 dfd09e84 dfd09e20 808931e0 80889c54 9e20: dfd09e4c dfd09e30 8089ec2c 8050a4c4 00010001 00000001 8057abbc 00000000 9e40: 00000000 8549e00c 00000000 00000000 00010001 f284897b 80886a40 856c7000 9e60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 84524800 dfd09ebc dfd09e88 9e80: 80886bd8 80892f38 856c73c0 856c7480 856c7540 8548a000 856c706c 856c7000 9ea0: 85740000 00000000 00000000 84524800 dfd09f14 dfd09ec0 808877a8 80886b7c 9ec0: 8088e164 81a4bdf8 dfd09f24 dfd09ed8 00000800 00000800 81cf0b5c 00000800 9ee0: 8548a000 f284897b 8489b840 00000000 8548a000 00003516 8489b840 00000000 9f00: 84524800 00000000 dfd09fa4 dfd09f18 80888250 808875a8 ecac8b10 8548a040 9f20: 00000000 00000000 81a4fbd0 81a4faa0 dfd09f54 dfd09f40 8026b438 8029ce1c 9f40: dfd09fb0 40000000 dfd09f84 dfd09f58 802229dc 8026b3f4 00000000 8281d05c 9f60: dfd09fb0 0014c490 ecac8b10 80222930 00000000 f284897b dfd09fac 00000000 9f80: 00000000 002e630c 000001aa 8020029c 84524800 000001aa 00000000 dfd09fa8 9fa0: 80200060 80888124 00000000 00000000 00000007 00003516 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b2a0bc 9fe0: 76b29ec0 76b29eb0 0001939c 00131f30 60000010 00000007 00000000 00000000 Call trace: [<80889548>] (io_ring_buffers_peek) from [<80889cb0>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000362 r9:80000001 r8:00000000 r7:8549e00c r6:8549e000 r5:dfd09e44 r4:856c7000 [<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) r5:856c7000 r4:8503ec80 [<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) r10:84524800 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:856c7000 [<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) r10:84524800 r9:00000000 r8:00000000 r7:85740000 r6:856c7000 r5:856c706c r4:8548a000 [<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 r9:84524800 r8:00000000 r7:8489b840 r6:00003516 r5:8548a000 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfd09fa8 to 0xdfd09ff0) 9fa0: 00000000 00000000 00000007 00003516 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b2a0bc 9fe0: 76b29ec0 76b29eb0 0001939c 00131f30 r10:000001aa r9:84524800 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