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: 11167 Comm: kworker/u6:14 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 : [<807c970c>] lr : [<807c9cc8>] psr: 20000113 sp : eb4ade48 ip : eb4ade78 fp : eb4ade74 r10: 827e4712 r9 : 8ae16000 r8 : ffffffff r7 : 8ae1634c r6 : 00000001 r5 : 8ae14800 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 8ae14800 r0 : 8ae16000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84104740 DAC: 00000000 Register r0 information: slab kmalloc-2k start 8ae16000 pointer offset 0 size 2048 Register r1 information: slab kmalloc-2k start 8ae14800 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 8ae14800 pointer offset 0 size 2048 Register r6 information: non-paged memory Register r7 information: slab kmalloc-2k start 8ae16000 pointer offset 844 size 2048 Register r8 information: non-paged memory Register r9 information: slab kmalloc-2k start 8ae16000 pointer offset 0 size 2048 Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xeb4ac000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xeb4ac000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process kworker/u6:14 (pid: 11167, stack limit = 0xeb4ac000) Stack: (0xeb4ade48 to 0xeb4ae000) de40: 84015240 00000014 8ae16000 8ae16040 8ae1634c 82604d40 de60: 8ae163cc 827e4712 eb4ade9c eb4ade78 807c9cc8 807c96e0 00000000 88a2d5e1 de80: 8ae163bc 8ae16000 8ae16040 8ae1634c eb4adf04 eb4adea0 81827188 807c9c8c dea0: eb4adebc eb4adeb0 0001ad6e 8ae16000 00000000 eb4adec0 00000000 81825cb8 dec0: 00000000 00000000 eb4adec8 eb4adec8 8ae16000 88a2d5e1 eb4adf48 83905380 dee0: 8ae163bc 82c21600 82c0f200 00000180 84015240 82c21605 eb4adf44 eb4adf08 df00: 80265fd4 81826dec eb4adf2c eb4adf18 eb4adf44 eb4adf20 8026196c 83905380 df20: 839053ac 82c0f200 82604d40 82c0f220 84015240 61c88647 eb4adf84 eb4adf48 df40: 80266520 80265e44 82604d40 82604d40 61c88647 839053ac eb4adf84 8c268b80 df60: 84015240 802662e0 83905380 8999ba40 eb515e98 00000000 eb4adfac eb4adf88 df80: 8026d8e0 802662ec 8c268b80 8026d7dc 00000000 00000000 00000000 00000000 dfa0: 00000000 eb4adfb0 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: [<807c96d4>] (__io_remove_buffers) from [<807c9cc8>] (io_destroy_buffers+0x48/0x138 io_uring/kbuf.c:264) r10:827e4712 r9:8ae163cc r8:82604d40 r7:8ae1634c r6:8ae16040 r5:8ae16000 r4:00000014 r3:84015240 [<807c9c80>] (io_destroy_buffers) from [<81827188>] (io_ring_ctx_free io_uring/io_uring.c:2895 [inline]) [<807c9c80>] (io_destroy_buffers) from [<81827188>] (io_ring_exit_work+0x3a8/0x5ec io_uring/io_uring.c:3151) r7:8ae1634c r6:8ae16040 r5:8ae16000 r4:8ae163bc [<81826de0>] (io_ring_exit_work) from [<80265fd4>] (process_one_work+0x19c/0x4a8 kernel/workqueue.c:2630) r10:82c21605 r9:84015240 r8:00000180 r7:82c0f200 r6:82c21600 r5:8ae163bc r4:83905380 [<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 r9:84015240 r8:82c0f220 r7:82604d40 r6:82c0f200 r5:839053ac r4:83905380 [<802662e0>] (worker_thread) from [<8026d8e0>] (kthread+0x104/0x134 kernel/kthread.c:388) r10:00000000 r9:eb515e98 r8:8999ba40 r7:83905380 r6:802662e0 r5:84015240 r4:8c268b80 [<8026d7dc>] (kthread) from [<80200104>] (ret_from_fork+0x14/0x30 arch/arm/kernel/entry-common.S:134) Exception stack(0xeb4adfb0 to 0xeb4adff8) 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 r4:8c268b80 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