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: 13493 Comm: kworker/u5:2 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+0xa0/0x138 io_uring/kbuf.c:269 pc : [<807c9634>] lr : [<807c9c48>] psr: 20000113 sp : eabfde48 ip : eabfde78 fp : eabfde74 r10: 827e4691 r9 : 89dd0000 r8 : ffffffff r7 : 89dd034c r6 : 00000001 r5 : 8a4ffe00 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 8a4ffe00 r0 : 89dd0000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8a156bc0 DAC: fffffffd Register r0 information: slab kmalloc-2k start 89dd0000 pointer offset 0 size 2048 Register r1 information: slab kmalloc-64 start 8a4ffe00 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 8a4ffe00 pointer offset 0 size 64 Register r6 information: non-paged memory Register r7 information: slab kmalloc-2k start 89dd0000 pointer offset 844 size 2048 Register r8 information: non-paged memory Register r9 information: slab kmalloc-2k start 89dd0000 pointer offset 0 size 2048 Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xeabfc000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xeabfc000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process kworker/u5:2 (pid: 13493, stack limit = 0xeabfc000) Stack: (0xeabfde48 to 0xeabfe000) de40: 00000000 8a4ffe00 89dd0000 89dd00bc 89dd034c 82604d40 de60: 89dd03cc 827e4691 eabfde9c eabfde78 807c9c48 807c9608 00000081 0a5918b6 de80: 89dd03bc 89dd0000 89dd0040 89dd034c eabfdf04 eabfdea0 81826490 807c9bb4 dea0: eabfdebc eabfdeb0 000b3853 89dd0000 00000000 eabfdec0 00000000 81824fc0 dec0: 00000000 00000000 eabfdec8 eabfdec8 89dd0000 0a5918b6 eabfdf48 8eb9a280 dee0: 89dd03bc 82c21400 82c0f000 00000140 8bbee9c0 82c21405 eabfdf44 eabfdf08 df00: 80265fd4 818260f4 eabfdf2c eabfdf18 eabfdf44 eabfdf20 8026196c 8eb9a280 df20: 8eb9a2ac 82c0f000 82604d40 82c0f020 8bbee9c0 61c88647 eabfdf84 eabfdf48 df40: 80266520 80265e44 eabfdf64 eabfdf58 81847b70 80278e68 eabfdf84 911fda00 df60: 8bbee9c0 802662e0 8eb9a280 911fdc40 dfa45e98 00000000 eabfdfac eabfdf88 df80: 8026d8e0 802662ec 911fda00 8026d7dc 00000000 00000000 00000000 00000000 dfa0: 00000000 eabfdfb0 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: [<807c95fc>] (__io_remove_buffers) from [<807c9c48>] (io_destroy_buffers+0xa0/0x138 io_uring/kbuf.c:269) r10:827e4691 r9:89dd03cc r8:82604d40 r7:89dd034c r6:89dd00bc r5:89dd0000 r4:8a4ffe00 r3:00000000 [<807c9ba8>] (io_destroy_buffers) from [<81826490>] (io_ring_ctx_free io_uring/io_uring.c:2895 [inline]) [<807c9ba8>] (io_destroy_buffers) from [<81826490>] (io_ring_exit_work+0x3a8/0x5ec io_uring/io_uring.c:3151) r7:89dd034c r6:89dd0040 r5:89dd0000 r4:89dd03bc [<818260e8>] (io_ring_exit_work) from [<80265fd4>] (process_one_work+0x19c/0x4a8 kernel/workqueue.c:2630) r10:82c21405 r9:8bbee9c0 r8:00000140 r7:82c0f000 r6:82c21400 r5:89dd03bc r4:8eb9a280 [<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 r9:8bbee9c0 r8:82c0f020 r7:82604d40 r6:82c0f000 r5:8eb9a2ac r4:8eb9a280 [<802662e0>] (worker_thread) from [<8026d8e0>] (kthread+0x104/0x134 kernel/kthread.c:388) r10:00000000 r9:dfa45e98 r8:911fdc40 r7:8eb9a280 r6:802662e0 r5:8bbee9c0 r4:911fda00 [<8026d7dc>] (kthread) from [<80200104>] (ret_from_fork+0x14/0x30 arch/arm/kernel/entry-common.S:134) Exception stack(0xeabfdfb0 to 0xeabfdff8) 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 r4:911fda00 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