8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=88920003, *pmd=eb4d6003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 6132 Comm: syz.1.591 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 : dfeb9dc0 ip : dfeb9e08 fp : dfeb9e04 r10: 00000242 r9 : 00000000 r8 : 850bc400 r7 : 850be40c r6 : 850be400 r5 : dfeb9e44 r4 : 83b8f000 r3 : 00000001 r2 : 850be40c r1 : dfeb9e44 r0 : 83b8f000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84ecb4c0 DAC: fffffffd Register r0 information: slab io_kiocb start 83b8f000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfeb8000 allocated at vhost_task_create+0xe4/0x134 kernel/vhost_task.c:145 Register r2 information: slab kmalloc-256 start 850be400 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 83b8f000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfeb8000 allocated at vhost_task_create+0xe4/0x134 kernel/vhost_task.c:145 Register r6 information: slab kmalloc-256 start 850be400 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 850be400 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 850bc400 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 0xdfeb8000 allocated at vhost_task_create+0xe4/0x134 kernel/vhost_task.c:145 Register r12 information: 2-page vmalloc region starting at 0xdfeb8000 allocated at vhost_task_create+0xe4/0x134 kernel/vhost_task.c:145 Process syz.1.591 (pid: 6132, stack limit = 0xdfeb8000) Stack: (0xdfeb9dc0 to 0xdfeba000) 9dc0: 81a4be54 8030cb0c 85053900 00000001 00010000 850be40c 00000000 83b8f000 9de0: dfeb9e44 850be400 850be40c 00000000 80000001 00000242 dfeb9e1c dfeb9e08 9e00: 80889cb0 80889554 8552e280 83b8f000 dfeb9e84 dfeb9e20 808931e0 80889c54 9e20: dfeb9e4c dfeb9e30 8089ec2c 8050a4c4 00010001 00000001 8057abbc 00000000 9e40: 00000000 850be40c 00000000 00000000 00010001 a2fd6eb2 80886a40 83b8f000 9e60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 858eb000 dfeb9ebc dfeb9e88 9e80: 80886bd8 80892f38 83b8f3c0 83b8f480 83b8f540 85053800 83b8f06c 83b8f000 9ea0: 85c60000 00000000 00000000 858eb000 dfeb9f14 dfeb9ec0 808877a8 80886b7c 9ec0: 8088e164 81a4bdf8 00000000 00000000 00000800 00000800 81cf0b5c 00000800 9ee0: 85053800 a2fd6eb2 85277540 00000000 85053800 00003516 85277540 00000000 9f00: 858eb000 00000000 dfeb9fa4 dfeb9f18 80888250 808875a8 ecac8b10 85053840 9f20: 00000000 00000000 81a4fbd0 81a4faa0 dfeb9f54 dfeb9f40 8026b438 8029ce1c 9f40: dfeb9fb0 40000000 dfeb9f84 dfeb9f58 802229dc 8026b3f4 00000000 8281d05c 9f60: dfeb9fb0 0014c490 ecac8b10 80222930 00000000 a2fd6eb2 dfeb9fac 00000000 9f80: 00000000 002e630c 000001aa 8020029c 858eb000 000001aa 00000000 dfeb9fa8 9fa0: 80200060 80888124 00000000 00000000 00000004 00003516 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b2d0bc 9fe0: 76b2cec0 76b2ceb0 0001939c 00131f30 60000010 00000004 00000000 00000000 Call trace: [<80889548>] (io_ring_buffers_peek) from [<80889cb0>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000242 r9:80000001 r8:00000000 r7:850be40c r6:850be400 r5:dfeb9e44 r4:83b8f000 [<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) r5:83b8f000 r4:8552e280 [<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) r10:858eb000 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:83b8f000 [<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) r10:858eb000 r9:00000000 r8:00000000 r7:85c60000 r6:83b8f000 r5:83b8f06c r4:85053800 [<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 r9:858eb000 r8:00000000 r7:85277540 r6:00003516 r5:85053800 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfeb9fa8 to 0xdfeb9ff0) 9fa0: 00000000 00000000 00000004 00003516 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b2d0bc 9fe0: 76b2cec0 76b2ceb0 0001939c 00131f30 r10:000001aa r9:858eb000 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