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: 1369 Comm: kworker/u6:2 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 : eafb5e48 ip : eafb5e78 fp : eafb5e74 r10: 827e4712 r9 : 8a178800 r8 : ffffffff r7 : 8a178b4c r6 : 00000001 r5 : 8a17b000 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 8a17b000 r0 : 8a178800 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 89738b40 DAC: 00000000 Register r0 information: slab kmalloc-2k start 8a178800 pointer offset 0 size 2048 Register r1 information: slab kmalloc-2k start 8a17b000 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 8a17b000 pointer offset 0 size 2048 Register r6 information: non-paged memory Register r7 information: slab kmalloc-2k start 8a178800 pointer offset 844 size 2048 Register r8 information: non-paged memory Register r9 information: slab kmalloc-2k start 8a178800 pointer offset 0 size 2048 Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xeafb4000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xeafb4000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process kworker/u6:2 (pid: 1369, stack limit = 0xeafb4000) Stack: (0xeafb5e48 to 0xeafb6000) 5e40: 82fad240 00000014 8a178800 8a178840 8a178b4c 82604d40 5e60: 8a178bcc 827e4712 eafb5e9c eafb5e78 807c9ca0 807c96b8 00000000 4584dd91 5e80: 8a178bbc 8a178800 8a178840 8a178b4c eafb5f04 eafb5ea0 81826748 807c9c64 5ea0: eafb5ebc eafb5eb0 00075fd9 8a178800 00000000 eafb5ec0 00000000 81825278 5ec0: 00000000 00000000 eafb5ec8 eafb5ec8 8a178800 4584dd91 eafb5f48 8b399180 5ee0: 8a178bbc 82c21600 82c0f200 00000180 82fad240 82c21605 eafb5f44 eafb5f08 5f00: 80265fd4 818263ac eafb5f2c eafb5f18 eafb5f44 eafb5f20 8026196c 8b399180 5f20: 8b3991ac 82c0f200 82604d40 82c0f220 82fad240 61c88647 eafb5f84 eafb5f48 5f40: 80266520 80265e44 eafb5f64 eafb5f58 81847e28 80278e68 eafb5f84 8a98c480 5f60: 82fad240 802662e0 8b399180 8a98c180 e054de98 00000000 eafb5fac eafb5f88 5f80: 8026d8e0 802662ec 8a98c480 8026d7dc 00000000 00000000 00000000 00000000 5fa0: 00000000 eafb5fb0 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 r9:8a178bcc r8:82604d40 r7:8a178b4c r6:8a178840 r5:8a178800 r4:00000014 r3:82fad240 [<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) r7:8a178b4c r6:8a178840 r5:8a178800 r4:8a178bbc [<818263a0>] (io_ring_exit_work) from [<80265fd4>] (process_one_work+0x19c/0x4a8 kernel/workqueue.c:2630) r10:82c21605 r9:82fad240 r8:00000180 r7:82c0f200 r6:82c21600 r5:8a178bbc r4:8b399180 [<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 r9:82fad240 r8:82c0f220 r7:82604d40 r6:82c0f200 r5:8b3991ac r4:8b399180 [<802662e0>] (worker_thread) from [<8026d8e0>] (kthread+0x104/0x134 kernel/kthread.c:388) r10:00000000 r9:e054de98 r8:8a98c180 r7:8b399180 r6:802662e0 r5:82fad240 r4:8a98c480 [<8026d7dc>] (kthread) from [<80200104>] (ret_from_fork+0x14/0x30 arch/arm/kernel/entry-common.S:134) Exception stack(0xeafb5fb0 to 0xeafb5ff8) 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 r4:8a98c480 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