8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=80000080004003, *pmd=00000000 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 14225 Comm: kworker/u6:1 Not tainted 6.6.0-rc4-syzkaller #0 Hardware name: ARM-Versatile Express Workqueue: events_unbound io_ring_exit_work PC is at __io_remove_buffers io_uring/kbuf.c:219 [inline] PC is at __io_remove_buffers+0x38/0x184 io_uring/kbuf.c:209 LR is at io_destroy_buffers+0x48/0x138 io_uring/kbuf.c:264 pc : [<807c96e4>] lr : [<807c9ca0>] psr: 20000113 sp : df9d5e48 ip : df9d5e78 fp : df9d5e74 r10: 827e4712 r9 : 899d4000 r8 : ffffffff r7 : 899d434c r6 : 00000001 r5 : 899d4800 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 899d4800 r0 : 899d4000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 899a3b00 DAC: 00000000 Register r0 information: slab kmalloc-2k start 899d4000 pointer offset 0 size 2048 Register r1 information: slab kmalloc-2k start 899d4800 pointer offset 0 size 2048 Register r2 information: NULL pointer Register r3 information: NULL pointer Register r4 information: NULL pointer Register r5 information: slab kmalloc-2k start 899d4800 pointer offset 0 size 2048 Register r6 information: non-paged memory Register r7 information: slab kmalloc-2k start 899d4000 pointer offset 844 size 2048 Register r8 information: non-paged memory Register r9 information: slab kmalloc-2k start 899d4000 pointer offset 0 size 2048 Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdf9d4000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xdf9d4000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process kworker/u6:1 (pid: 14225, stack limit = 0xdf9d4000) Stack: (0xdf9d5e48 to 0xdf9d6000) 5e40: 895f8bc0 00000014 899d4000 899d4040 899d434c 82604d40 5e60: 899d43cc 827e4712 df9d5e9c df9d5e78 807c9ca0 807c96b8 00000000 5fee9780 5e80: 899d43bc 899d4000 899d4040 899d434c df9d5f04 df9d5ea0 81826748 807c9c64 5ea0: df9d5ebc df9d5eb0 0001f683 899d4000 00000000 df9d5ec0 00000000 81825278 5ec0: 00000000 00000000 df9d5ec8 df9d5ec8 899d4000 5fee9780 df9d5f48 89b0ce00 5ee0: 899d43bc 82c21600 82c0f200 00000180 895f8bc0 82c21605 df9d5f44 df9d5f08 5f00: 80265fd4 818263ac df9d5f2c df9d5f18 df9d5f44 df9d5f20 8026196c 89b0ce00 5f20: 89b0ce2c 82c0f200 82604d40 82c0f220 895f8bc0 61c88647 df9d5f84 df9d5f48 5f40: 80266520 80265e44 df9d5f64 df9d5f58 81847e28 80278e68 df9d5f84 899acf40 5f60: 895f8bc0 802662e0 89b0ce00 89babec0 eaff1e98 00000000 df9d5fac df9d5f88 5f80: 8026d8e0 802662ec 899acf40 8026d7dc 00000000 00000000 00000000 00000000 5fa0: 00000000 df9d5fb0 80200104 8026d7e8 00000000 00000000 00000000 00000000 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000 Backtrace: [<807c96ac>] (__io_remove_buffers) from [<807c9ca0>] (io_destroy_buffers+0x48/0x138 io_uring/kbuf.c:264) r10:827e4712 r9:899d43cc r8:82604d40 r7:899d434c r6:899d4040 r5:899d4000 r4:00000014 r3:895f8bc0 [<807c9c58>] (io_destroy_buffers) from [<81826748>] (io_ring_ctx_free io_uring/io_uring.c:2895 [inline]) [<807c9c58>] (io_destroy_buffers) from [<81826748>] (io_ring_exit_work+0x3a8/0x5ec io_uring/io_uring.c:3151) r7:899d434c r6:899d4040 r5:899d4000 r4:899d43bc [<818263a0>] (io_ring_exit_work) from [<80265fd4>] (process_one_work+0x19c/0x4a8 kernel/workqueue.c:2630) r10:82c21605 r9:895f8bc0 r8:00000180 r7:82c0f200 r6:82c21600 r5:899d43bc r4:89b0ce00 [<80265e38>] (process_one_work) from [<80266520>] (process_scheduled_works kernel/workqueue.c:2703 [inline]) [<80265e38>] (process_one_work) from [<80266520>] (worker_thread+0x240/0x48c kernel/workqueue.c:2784) r10:61c88647 r9:895f8bc0 r8:82c0f220 r7:82604d40 r6:82c0f200 r5:89b0ce2c r4:89b0ce00 [<802662e0>] (worker_thread) from [<8026d8e0>] (kthread+0x104/0x134 kernel/kthread.c:388) r10:00000000 r9:eaff1e98 r8:89babec0 r7:89b0ce00 r6:802662e0 r5:895f8bc0 r4:899acf40 [<8026d7dc>] (kthread) from [<80200104>] (ret_from_fork+0x14/0x30 arch/arm/kernel/entry-common.S:134) Exception stack(0xdf9d5fb0 to 0xdf9d5ff8) 5fa0: 00000000 00000000 00000000 00000000 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8026d7dc r4:899acf40 Code: 0a000022 e5913004 e1d120be e5d14013 (e1d380be) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 0a000022 beq 0x90 4: e5913004 ldr r3, [r1, #4] 8: e1d120be ldrh r2, [r1, #14] c: e5d14013 ldrb r4, [r1, #19] * 10: e1d380be ldrh r8, [r3, #14] <-- trapping instruction