usercopy: Kernel memory overwrite attempt detected to SLUB object 'task_struct' (offset 80, size 116)!
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kernel BUG at mm/usercopy.c:102!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 7722 Comm: syz-executor.0 Not tainted 6.9.0-rc5-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at usercopy_abort+0x98/0x9c mm/usercopy.c:102
LR is at __wake_up_klogd.part.0+0x7c/0xac kernel/printk/printk.c:3926
pc : [<818a8084>]    lr : [<802ba680>]    psr: 60000013
sp : dfe51e40  ip : dfe51d88  fp : dfe51e64
r10: 0000001a  r9 : 835ec800  r8 : 835ebc50
r7 : dde724a0  r6 : 00000000  r5 : 00000074  r4 : 00000050
r3 : 835ec800  r2 : 00000000  r1 : 00000000  r0 : 00000066
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 84793500  DAC: fffffffd
Register r0 information: non-paged memory
Register r1 information: NULL pointer
Register r2 information: NULL pointer
Register r3 information: slab task_struct start 835ec800 pointer offset 0 size 3072
Register r4 information: non-paged memory
Register r5 information: non-paged memory
Register r6 information: NULL pointer
Register r7 information: non-slab/vmalloc memory
Register r8 information: slab task_struct start 835ebc00 pointer offset 80 size 3072
Register r9 information: slab task_struct start 835ec800 pointer offset 0 size 3072
Register r10 information: non-paged memory
Register r11 information: 2-page vmalloc region starting at 0xdfe50000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797
Register r12 information: 2-page vmalloc region starting at 0xdfe50000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797
Process syz-executor.0 (pid: 7722, stack limit = 0xdfe50000)
Stack: (0xdfe51e40 to 0xdfe52000)
1e40: 81fec75c 81fbf358 81fd3998 00000050 00000074 835ec800 dfe51e94 dfe51e68
1e60: 804b81b4 818a7ff8 00000074 dfe51e78 80216314 835ebc50 00000074 00000000
1e80: 835ebcc4 dde724a0 dfe51ecc dfe51e98 804ef2f0 804b80e8 00000074 00000000
1ea0: dfe51ebc 835ebc50 00000074 00000000 00000000 200001c0 835ec800 0000001a
1ec0: dfe51ef4 dfe51ed0 8020a0e4 804ef110 dfe51ef4 dfe51ee0 818cc998 8027c9dc
1ee0: 200001c0 0000000c dfe51f6c dfe51ef8 8020a724 8020a060 00000000 200001c0
1f00: dfe51f1c dfe51f10 818cc864 8027b084 dfe51f6c dfe51f20 80280e88 818cc840
1f20: dfe51f54 00000000 8027cafc 60000013 8187a464 81891804 dfe51f54 499b202c
1f40: 835ebc00 0000000f 835ebc00 499b202c 0000000f 835ebc00 00000000 00000000
1f60: dfe51fa4 dfe51f70 80253570 8020a43c 80203054 499b202c dfe51fac 00000000
1f80: 00000000 0014c2cc 0000001a 80200288 835ec800 0000001a 00000000 dfe51fa8
1fa0: 80200060 80253340 00000000 00000000 0000000f 00000204 00000000 200001c0
1fc0: 00000000 00000000 0014c2cc 0000001a 7e97332e 7e97332f 003d0f00 76b170fc
1fe0: 76b16f08 76b16ef8 00016ab0 00050bf0 60000010 0000000f 00000000 00000000
Call trace: 
[<818a7fec>] (usercopy_abort) from [<804b81b4>] (__check_heap_object+0xd8/0xf4 mm/slub.c:5370)
[<804b80dc>] (__check_heap_object) from [<804ef2f0>] (check_heap_object mm/usercopy.c:196 [inline])
[<804b80dc>] (__check_heap_object) from [<804ef2f0>] (__check_object_size mm/usercopy.c:251 [inline])
[<804b80dc>] (__check_heap_object) from [<804ef2f0>] (__check_object_size+0x1ec/0x30c mm/usercopy.c:213)
 r8:dde724a0 r7:835ebcc4 r6:00000000 r5:00000074 r4:835ebc50
[<804ef104>] (__check_object_size) from [<8020a0e4>] (check_object_size include/linux/thread_info.h:215 [inline])
[<804ef104>] (__check_object_size) from [<8020a0e4>] (__copy_from_user include/linux/uaccess.h:101 [inline])
[<804ef104>] (__check_object_size) from [<8020a0e4>] (user_regset_copyin include/linux/regset.h:268 [inline])
[<804ef104>] (__check_object_size) from [<8020a0e4>] (fpa_set+0x90/0xfc arch/arm/kernel/ptrace.c:587)
 r10:0000001a r9:835ec800 r8:200001c0 r7:00000000 r6:00000000 r5:00000074
 r4:835ebc50
[<8020a054>] (fpa_set) from [<8020a724>] (copy_regset_from_user include/linux/regset.h:337 [inline])
[<8020a054>] (fpa_set) from [<8020a724>] (arch_ptrace+0x2f4/0x3e4 arch/arm/kernel/ptrace.c:762)
 r5:0000000c r4:200001c0
[<8020a430>] (arch_ptrace) from [<80253570>] (__do_sys_ptrace kernel/ptrace.c:1285 [inline])
[<8020a430>] (arch_ptrace) from [<80253570>] (sys_ptrace+0x23c/0x4e4 kernel/ptrace.c:1258)
 r7:00000000 r6:00000000 r5:835ebc00 r4:0000000f
[<80253334>] (sys_ptrace) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xdfe51fa8 to 0xdfe51ff0)
1fa0:                   00000000 00000000 0000000f 00000204 00000000 200001c0
1fc0: 00000000 00000000 0014c2cc 0000001a 7e97332e 7e97332f 003d0f00 76b170fc
1fe0: 76b16f08 76b16ef8 00016ab0 00050bf0
 r10:0000001a r9:835ec800 r8:80200288 r7:0000001a r6:0014c2cc r5:00000000
 r4:00000000
Code: e30c0760 e34801fe e58dc000 ebfff359 (e7f001f2) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e30c0760 	movw	r0, #51040	@ 0xc760
   4:	e34801fe 	movt	r0, #33278	@ 0x81fe
   8:	e58dc000 	str	ip, [sp]
   c:	ebfff359 	bl	0xffffcd78
* 10:	e7f001f2 	udf	#18 <-- trapping instruction