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: 14289 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 : ead3de48 ip : ead3de78 fp : ead3de74 r10: 827e4712 r9 : 89c27800 r8 : ffffffff r7 : 89c27b4c r6 : 00000001 r5 : 89c20000 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 89c20000 r0 : 89c27800 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8acd1100 DAC: 00000000 Register r0 information: slab kmalloc-2k start 89c27800 pointer offset 0 size 2048 Register r1 information: slab kmalloc-2k start 89c20000 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 89c20000 pointer offset 0 size 2048 Register r6 information: non-paged memory Register r7 information: slab kmalloc-2k start 89c27800 pointer offset 844 size 2048 Register r8 information: non-paged memory Register r9 information: slab kmalloc-2k start 89c27800 pointer offset 0 size 2048 Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xead3c000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xead3c000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process kworker/u6:1 (pid: 14289, stack limit = 0xead3c000) Stack: (0xead3de48 to 0xead3e000) de40: 84508bc0 00000014 89c27800 89c27840 89c27b4c 82604d40 de60: 89c27bcc 827e4712 ead3de9c ead3de78 807c9ca0 807c96b8 00000000 e14ee4db de80: 89c27bbc 89c27800 89c27840 89c27b4c ead3df04 ead3dea0 81826748 807c9c64 dea0: ead3debc ead3deb0 00032258 89c27800 00000000 ead3dec0 00000000 81825278 dec0: 00000000 00000000 ead3dec8 ead3dec8 89c27800 e14ee4db ead3df48 89eca800 dee0: 89c27bbc 82c21600 82c0f200 00000180 84508bc0 82c21605 ead3df44 ead3df08 df00: 80265fd4 818263ac ead3df2c ead3df18 ead3df44 ead3df20 8026196c 89eca800 df20: 89eca82c 82c0f200 82604d40 82c0f220 84508bc0 61c88647 ead3df84 ead3df48 df40: 80266520 80265e44 ead3df64 ead3df58 81847e28 80278e68 ead3df84 838c20c0 df60: 84508bc0 802662e0 89eca800 89ec9780 eb535e98 00000000 ead3dfac ead3df88 df80: 8026d8e0 802662ec 838c20c0 8026d7dc 00000000 00000000 00000000 00000000 dfa0: 00000000 ead3dfb0 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 r9:89c27bcc r8:82604d40 r7:89c27b4c r6:89c27840 r5:89c27800 r4:00000014 r3:84508bc0 [<807c9c58>] (io_destroy_buffers) from [<81826748>] (io_ring_ctx_free io_uring/io_uring.c:2895 [inline]) [<807c9c58>] (io_destroy_buffers) from [<81826748>] (io_ring_exit_work+0x3a8/0x5ec io_uring/io_uring.c:3151) r7:89c27b4c r6:89c27840 r5:89c27800 r4:89c27bbc [<818263a0>] (io_ring_exit_work) from [<80265fd4>] (process_one_work+0x19c/0x4a8 kernel/workqueue.c:2630) r10:82c21605 r9:84508bc0 r8:00000180 r7:82c0f200 r6:82c21600 r5:89c27bbc r4:89eca800 [<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 r9:84508bc0 r8:82c0f220 r7:82604d40 r6:82c0f200 r5:89eca82c r4:89eca800 [<802662e0>] (worker_thread) from [<8026d8e0>] (kthread+0x104/0x134 kernel/kthread.c:388) r10:00000000 r9:eb535e98 r8:89ec9780 r7:89eca800 r6:802662e0 r5:84508bc0 r4:838c20c0 [<8026d7dc>] (kthread) from [<80200104>] (ret_from_fork+0x14/0x30 arch/arm/kernel/entry-common.S:134) Exception stack(0xead3dfb0 to 0xead3dff8) 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 r4:838c20c0 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