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: 0 PID: 21436 Comm: kworker/u5:2 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 : e0139e48 ip : e0139e78 fp : e0139e74 r10: 827e4712 r9 : 846d8000 r8 : ffffffff r7 : 846d834c r6 : 00000001 r5 : 846d8800 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 846d8800 r0 : 846d8000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 82cc6e40 DAC: fffffffd Register r0 information: slab kmalloc-2k start 846d8000 pointer offset 0 size 2048 Register r1 information: slab kmalloc-2k start 846d8800 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 846d8800 pointer offset 0 size 2048 Register r6 information: non-paged memory Register r7 information: slab kmalloc-2k start 846d8000 pointer offset 844 size 2048 Register r8 information: non-paged memory Register r9 information: slab kmalloc-2k start 846d8000 pointer offset 0 size 2048 Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xe0138000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xe0138000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process kworker/u5:2 (pid: 21436, stack limit = 0xe0138000) Stack: (0xe0139e48 to 0xe013a000) 9e40: 82f78bc0 00000014 846d8000 846d8040 846d834c 82604d40 9e60: 846d83cc 827e4712 e0139e9c e0139e78 807c9ca0 807c96b8 00000000 5573dad9 9e80: 846d83bc 846d8000 846d8040 846d834c e0139f04 e0139ea0 81826728 807c9c64 9ea0: e0139ebc e0139eb0 000614da 846d8000 00000000 e0139ec0 00000000 81825258 9ec0: 00000000 00000000 e0139ec8 e0139ec8 846d8000 5573dad9 e0139f48 894ad480 9ee0: 846d83bc 82c21400 82c0f000 00000140 82f78bc0 82c21405 e0139f44 e0139f08 9f00: 80265fd4 8182638c e0139f2c e0139f18 e0139f44 e0139f20 8026196c 894ad480 9f20: 894ad4ac 82c0f000 82604d40 82c0f020 82f78bc0 61c88647 e0139f84 e0139f48 9f40: 80266520 80265e44 82604d40 82604d40 61c88647 894ad4ac e0139f84 89dd1600 9f60: 82f78bc0 802662e0 894ad480 8aa22b40 e4835e98 00000000 e0139fac e0139f88 9f80: 8026d8e0 802662ec 89dd1600 8026d7dc 00000000 00000000 00000000 00000000 9fa0: 00000000 e0139fb0 80200104 8026d7e8 00000000 00000000 00000000 00000000 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9fe0: 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 r9:846d83cc r8:82604d40 r7:846d834c r6:846d8040 r5:846d8000 r4:00000014 r3:82f78bc0 [<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) r7:846d834c r6:846d8040 r5:846d8000 r4:846d83bc [<81826380>] (io_ring_exit_work) from [<80265fd4>] (process_one_work+0x19c/0x4a8 kernel/workqueue.c:2630) r10:82c21405 r9:82f78bc0 r8:00000140 r7:82c0f000 r6:82c21400 r5:846d83bc r4:894ad480 [<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 r9:82f78bc0 r8:82c0f020 r7:82604d40 r6:82c0f000 r5:894ad4ac r4:894ad480 [<802662e0>] (worker_thread) from [<8026d8e0>] (kthread+0x104/0x134 kernel/kthread.c:388) r10:00000000 r9:e4835e98 r8:8aa22b40 r7:894ad480 r6:802662e0 r5:82f78bc0 r4:89dd1600 [<8026d7dc>] (kthread) from [<80200104>] (ret_from_fork+0x14/0x30 arch/arm/kernel/entry-common.S:134) Exception stack(0xe0139fb0 to 0xe0139ff8) 9fa0: 00000000 00000000 00000000 00000000 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8026d7dc r4:89dd1600 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