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: 12520 Comm: kworker/u6:5 Not tainted 6.6.0-rc3-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 : [<807c966c>] lr : [<807c9c28>] psr: 20000113 sp : ed2f9e48 ip : ed2f9e78 fp : ed2f9e74 r10: 827e4691 r9 : 955d9000 r8 : ffffffff r7 : 955d934c r6 : 00000001 r5 : 955de000 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 955de000 r0 : 955d9000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8a6a2e00 DAC: fffffffd Register r0 information: slab kmalloc-2k start 955d9000 pointer offset 0 size 2048 Register r1 information: slab kmalloc-2k start 955de000 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 955de000 pointer offset 0 size 2048 Register r6 information: non-paged memory Register r7 information: slab kmalloc-2k start 955d9000 pointer offset 844 size 2048 Register r8 information: non-paged memory Register r9 information: slab kmalloc-2k start 955d9000 pointer offset 0 size 2048 Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xed2f8000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xed2f8000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process kworker/u6:5 (pid: 12520, stack limit = 0xed2f8000) Stack: (0xed2f9e48 to 0xed2fa000) 9e40: 837abac0 00000014 955d9000 955d9040 955d934c 82604d40 9e60: 955d93cc 827e4691 ed2f9e9c ed2f9e78 807c9c28 807c9640 00000000 71258a37 9e80: 955d93bc 955d9000 955d9040 955d934c ed2f9f04 ed2f9ea0 818264d0 807c9bec 9ea0: ed2f9ebc 955d93cc 000424ec 955d9000 00000000 00000000 00000000 81825000 9ec0: 00000000 00030003 ed2f9ec8 ed2f9ec8 955d9000 71258a37 ed2f9f48 8a44f700 9ee0: 955d93bc 82c21600 82c0f200 00000180 837abac0 82c21605 ed2f9f44 ed2f9f08 9f00: 80265fd4 81826134 ed2f9f2c ed2f9f18 ed2f9f44 ed2f9f20 8026196c 8a44f700 9f20: 8a44f72c 82c0f200 82604d40 82c0f220 837abac0 61c88647 ed2f9f84 ed2f9f48 9f40: 80266520 80265e44 82604d40 82604d40 61c88647 8a44f72c ed2f9f84 8a6cc600 9f60: 837abac0 802662e0 8a44f700 8a6cb340 ed389e98 00000000 ed2f9fac ed2f9f88 9f80: 8026d8e0 802662ec 8a6cc600 8026d7dc 00000000 00000000 00000000 00000000 9fa0: 00000000 ed2f9fb0 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: [<807c9634>] (__io_remove_buffers) from [<807c9c28>] (io_destroy_buffers+0x48/0x138 io_uring/kbuf.c:264) r10:827e4691 r9:955d93cc r8:82604d40 r7:955d934c r6:955d9040 r5:955d9000 r4:00000014 r3:837abac0 [<807c9be0>] (io_destroy_buffers) from [<818264d0>] (io_ring_ctx_free io_uring/io_uring.c:2895 [inline]) [<807c9be0>] (io_destroy_buffers) from [<818264d0>] (io_ring_exit_work+0x3a8/0x5ec io_uring/io_uring.c:3151) r7:955d934c r6:955d9040 r5:955d9000 r4:955d93bc [<81826128>] (io_ring_exit_work) from [<80265fd4>] (process_one_work+0x19c/0x4a8 kernel/workqueue.c:2630) r10:82c21605 r9:837abac0 r8:00000180 r7:82c0f200 r6:82c21600 r5:955d93bc r4:8a44f700 [<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 r9:837abac0 r8:82c0f220 r7:82604d40 r6:82c0f200 r5:8a44f72c r4:8a44f700 [<802662e0>] (worker_thread) from [<8026d8e0>] (kthread+0x104/0x134 kernel/kthread.c:388) r10:00000000 r9:ed389e98 r8:8a6cb340 r7:8a44f700 r6:802662e0 r5:837abac0 r4:8a6cc600 [<8026d7dc>] (kthread) from [<80200104>] (ret_from_fork+0x14/0x30 arch/arm/kernel/entry-common.S:134) Exception stack(0xed2f9fb0 to 0xed2f9ff8) 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 r4:8a6cc600 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