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: 2448 Comm: kworker/u6:3 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 : e07a9e48 ip : e07a9e78 fp : e07a9e74 r10: 827e4712 r9 : 843ea800 r8 : ffffffff r7 : 843eab4c r6 : 00000001 r5 : 8b20e000 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 8b20e000 r0 : 843ea800 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 894d7100 DAC: 00000000 Register r0 information: slab kmalloc-2k start 843ea800 pointer offset 0 size 2048 Register r1 information: slab kmalloc-2k start 8b20e000 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 8b20e000 pointer offset 0 size 2048 Register r6 information: non-paged memory Register r7 information: slab kmalloc-2k start 843ea800 pointer offset 844 size 2048 Register r8 information: non-paged memory Register r9 information: slab kmalloc-2k start 843ea800 pointer offset 0 size 2048 Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xe07a8000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xe07a8000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process kworker/u6:3 (pid: 2448, stack limit = 0xe07a8000) Stack: (0xe07a9e48 to 0xe07aa000) 9e40: 84169780 00000014 843ea800 843ea840 843eab4c 82604d40 9e60: 843eabcc 827e4712 e07a9e9c e07a9e78 807c9cc8 807c96e0 00000000 a8c4cb2b 9e80: 843eabbc 843ea800 843ea840 843eab4c e07a9f04 e07a9ea0 81827108 807c9c8c 9ea0: e07a9ebc e07a9eb0 000d89e4 843ea800 00000000 e07a9ec0 00000000 81825c38 9ec0: 00000000 00000000 e07a9ec8 e07a9ec8 843ea800 a8c4cb2b e07a9f48 83891380 9ee0: 843eabbc 82c21600 82c0f200 00000180 84169780 82c21605 e07a9f44 e07a9f08 9f00: 80265fd4 81826d6c e07a9f2c e07a9f18 e07a9f44 e07a9f20 8026196c 83891380 9f20: 838913ac 82c0f200 82604d40 82c0f220 84169780 61c88647 e07a9f84 e07a9f48 9f40: 80266520 80265e44 e07a9f64 e07a9f58 818487e8 80278e68 e07a9f84 89154040 9f60: 84169780 802662e0 83891380 89154f80 e05a5e98 00000000 e07a9fac e07a9f88 9f80: 8026d8e0 802662ec 89154040 8026d7dc 00000000 00000000 00000000 00000000 9fa0: 00000000 e07a9fb0 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: [<807c96d4>] (__io_remove_buffers) from [<807c9cc8>] (io_destroy_buffers+0x48/0x138 io_uring/kbuf.c:264) r10:827e4712 r9:843eabcc r8:82604d40 r7:843eab4c r6:843ea840 r5:843ea800 r4:00000014 r3:84169780 [<807c9c80>] (io_destroy_buffers) from [<81827108>] (io_ring_ctx_free io_uring/io_uring.c:2895 [inline]) [<807c9c80>] (io_destroy_buffers) from [<81827108>] (io_ring_exit_work+0x3a8/0x5ec io_uring/io_uring.c:3151) r7:843eab4c r6:843ea840 r5:843ea800 r4:843eabbc [<81826d60>] (io_ring_exit_work) from [<80265fd4>] (process_one_work+0x19c/0x4a8 kernel/workqueue.c:2630) r10:82c21605 r9:84169780 r8:00000180 r7:82c0f200 r6:82c21600 r5:843eabbc r4:83891380 [<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 r9:84169780 r8:82c0f220 r7:82604d40 r6:82c0f200 r5:838913ac r4:83891380 [<802662e0>] (worker_thread) from [<8026d8e0>] (kthread+0x104/0x134 kernel/kthread.c:388) r10:00000000 r9:e05a5e98 r8:89154f80 r7:83891380 r6:802662e0 r5:84169780 r4:89154040 [<8026d7dc>] (kthread) from [<80200104>] (ret_from_fork+0x14/0x30 arch/arm/kernel/entry-common.S:134) Exception stack(0xe07a9fb0 to 0xe07a9ff8) 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 r4:89154040 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