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: 15054 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+0xa0/0x138 io_uring/kbuf.c:269 pc : [<807c96e4>] lr : [<807c9cf8>] psr: 20000013 sp : ed0a9e48 ip : ed0a9e78 fp : ed0a9e74 r10: 827e4712 r9 : 84517800 r8 : ffffffff r7 : 84517b4c r6 : 00000001 r5 : 84036300 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 84036300 r0 : 84517800 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8459b040 DAC: 00000000 Register r0 information: slab kmalloc-2k start 84517800 pointer offset 0 size 2048 Register r1 information: slab kmalloc-64 start 84036300 pointer offset 0 size 64 Register r2 information: NULL pointer Register r3 information: NULL pointer Register r4 information: NULL pointer Register r5 information: slab kmalloc-64 start 84036300 pointer offset 0 size 64 Register r6 information: non-paged memory Register r7 information: slab kmalloc-2k start 84517800 pointer offset 844 size 2048 Register r8 information: non-paged memory Register r9 information: slab kmalloc-2k start 84517800 pointer offset 0 size 2048 Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xed0a8000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xed0a8000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process kworker/u6:1 (pid: 15054, stack limit = 0xed0a8000) Stack: (0xed0a9e48 to 0xed0aa000) 9e40: 00000000 84036300 84517800 845178bc 84517b4c 82604d40 9e60: 84517bcc 827e4712 ed0a9e9c ed0a9e78 807c9cf8 807c96b8 00004000 7eccb12b 9e80: 84517bbc 84517800 84517840 84517b4c ed0a9f04 ed0a9ea0 81826728 807c9c64 9ea0: 80200b64 817ef03c 00058de8 84517800 00000000 00008737 00000000 81825258 9ec0: 00000000 00000000 ed0a9ec8 ed0a9ec8 84517800 7eccb12b ed0a9f08 89f0ba80 9ee0: 84517bbc 82c21600 82c0f200 00000180 846c9780 82c21605 ed0a9f44 ed0a9f08 9f00: 80265fd4 8182638c ed0a9f2c ed0a9f18 ed0a9f44 ed0a9f20 8026196c 89f0ba80 9f20: 89f0baac 82c0f200 82604d40 82c0f220 846c9780 61c88647 ed0a9f84 ed0a9f48 9f40: 80266520 80265e44 82604d40 82604d40 61c88647 89f0baac ed0a9f84 89d47200 9f60: 846c9780 802662e0 89f0ba80 89f48040 e0659e98 00000000 ed0a9fac ed0a9f88 9f80: 8026d8e0 802662ec 89d47200 8026d7dc 00000000 00000000 00000000 00000000 9fa0: 00000000 ed0a9fb0 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 [<807c9cf8>] (io_destroy_buffers+0xa0/0x138 io_uring/kbuf.c:269) r10:827e4712 r9:84517bcc r8:82604d40 r7:84517b4c r6:845178bc r5:84517800 r4:84036300 r3:00000000 [<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) r7:84517b4c r6:84517840 r5:84517800 r4:84517bbc [<81826380>] (io_ring_exit_work) from [<80265fd4>] (process_one_work+0x19c/0x4a8 kernel/workqueue.c:2630) r10:82c21605 r9:846c9780 r8:00000180 r7:82c0f200 r6:82c21600 r5:84517bbc r4:89f0ba80 [<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 r9:846c9780 r8:82c0f220 r7:82604d40 r6:82c0f200 r5:89f0baac r4:89f0ba80 [<802662e0>] (worker_thread) from [<8026d8e0>] (kthread+0x104/0x134 kernel/kthread.c:388) r10:00000000 r9:e0659e98 r8:89f48040 r7:89f0ba80 r6:802662e0 r5:846c9780 r4:89d47200 [<8026d7dc>] (kthread) from [<80200104>] (ret_from_fork+0x14/0x30 arch/arm/kernel/entry-common.S:134) Exception stack(0xed0a9fb0 to 0xed0a9ff8) 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 r4:89d47200 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