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: 14421 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 : eb02de48 ip : eb02de78 fp : eb02de74 r10: 827e4712 r9 : 8ab56000 r8 : ffffffff r7 : 8ab5634c r6 : 00000001 r5 : 8ab53800 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 8ab53800 r0 : 8ab56000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8b4fdd40 DAC: 00000000 Register r0 information: slab kmalloc-2k start 8ab56000 pointer offset 0 size 2048 Register r1 information: slab kmalloc-2k start 8ab53800 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 8ab53800 pointer offset 0 size 2048 Register r6 information: non-paged memory Register r7 information: slab kmalloc-2k start 8ab56000 pointer offset 844 size 2048 Register r8 information: non-paged memory Register r9 information: slab kmalloc-2k start 8ab56000 pointer offset 0 size 2048 Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xeb02c000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xeb02c000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process kworker/u6:1 (pid: 14421, stack limit = 0xeb02c000) Stack: (0xeb02de48 to 0xeb02e000) de40: 84d80000 00000014 8ab56000 8ab56040 8ab5634c 82604d40 de60: 8ab563cc 827e4712 eb02de9c eb02de78 807c9ca0 807c96b8 00000000 4456df0c de80: 8ab563bc 8ab56000 8ab56040 8ab5634c eb02df04 eb02dea0 81826728 807c9c64 dea0: eb02debc eb02deb0 00060d33 8ab56000 00000000 eb02dec0 00000000 81825258 dec0: 00000000 00000000 eb02dec8 eb02dec8 8ab56000 4456df0c eb02df48 8a5dae80 dee0: 8ab563bc 82c21600 82c0f200 00000180 84d80000 82c21605 eb02df44 eb02df08 df00: 80265fd4 8182638c eb02df2c eb02df18 eb02df44 eb02df20 8026196c 8a5dae80 df20: 8a5daeac 82c0f200 82604d40 82c0f220 84d80000 61c88647 eb02df84 eb02df48 df40: 80266520 80265e44 eb02df64 eb02df58 81847e08 80278e68 eb02df84 8a5d5f80 df60: 84d80000 802662e0 8a5dae80 8b4ac6c0 e072de98 00000000 eb02dfac eb02df88 df80: 8026d8e0 802662ec 8a5d5f80 8026d7dc 00000000 00000000 00000000 00000000 dfa0: 00000000 eb02dfb0 80200104 8026d7e8 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 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 r9:8ab563cc r8:82604d40 r7:8ab5634c r6:8ab56040 r5:8ab56000 r4:00000014 r3:84d80000 [<807c9c58>] (io_destroy_buffers) from [<81826728>] (io_ring_ctx_free io_uring/io_uring.c:2895 [inline]) [<807c9c58>] (io_destroy_buffers) from [<81826728>] (io_ring_exit_work+0x3a8/0x5ec io_uring/io_uring.c:3151) r7:8ab5634c r6:8ab56040 r5:8ab56000 r4:8ab563bc [<81826380>] (io_ring_exit_work) from [<80265fd4>] (process_one_work+0x19c/0x4a8 kernel/workqueue.c:2630) r10:82c21605 r9:84d80000 r8:00000180 r7:82c0f200 r6:82c21600 r5:8ab563bc r4:8a5dae80 [<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 r9:84d80000 r8:82c0f220 r7:82604d40 r6:82c0f200 r5:8a5daeac r4:8a5dae80 [<802662e0>] (worker_thread) from [<8026d8e0>] (kthread+0x104/0x134 kernel/kthread.c:388) r10:00000000 r9:e072de98 r8:8b4ac6c0 r7:8a5dae80 r6:802662e0 r5:84d80000 r4:8a5d5f80 [<8026d7dc>] (kthread) from [<80200104>] (ret_from_fork+0x14/0x30 arch/arm/kernel/entry-common.S:134) Exception stack(0xeb02dfb0 to 0xeb02dff8) dfa0: 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8026d7dc r4:8a5d5f80 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