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 UID: 0 PID: 3847 Comm: syz.1.15 Not tainted 6.12.0-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:4495
pc : [<819a6788>]    lr : [<802bcae4>]    psr: 60000013
sp : e0495e38  ip : e0495d78  fp : e0495e5c
r10: 0000001a  r9 : 83fe4800  r8 : 83fe0050
r7 : dde88b80  r6 : 00000000  r5 : 00000074  r4 : 00000050
r3 : 83fe4800  r2 : 00000000  r1 : 00000000  r0 : 00000066
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 84faa140  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 83fe4800 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 83fe0000 pointer offset 80 size 3072
Register r9 information: slab task_struct start 83fe4800 pointer offset 0 size 3072
Register r10 information: non-paged memory
Register r11 information: 2-page vmalloc region starting at 0xe0494000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2786
Register r12 information: 2-page vmalloc region starting at 0xe0494000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2786
Process syz.1.15 (pid: 3847, stack limit = 0xe0494000)
Stack: (0xe0495e38 to 0xe0496000)
5e20:                                                       8205cb40 8202e418
5e40: 82043a48 00000050 00000074 83fe4800 e0495e8c e0495e60 804d0068 819a66fc
5e60: 00000074 e0495e70 802147e0 83fe0050 00000074 00000000 83fe00c4 dde88b80
5e80: e0495ec4 e0495e90 8050ef2c 804cff9c 00000074 00000000 e0495eb4 83fe0050
5ea0: 00000074 00000000 00000000 200003c0 83fe4800 0000001a e0495ef4 e0495ec8
5ec0: 80209d94 8050ecb0 83fe0000 dddd0400 e0495ef4 e0495ee0 819cbc9c 200003c0
5ee0: 0000000c 00000000 e0495f6c e0495ef8 8020a448 80209d10 00000000 200003c0
5f00: e0495f1c e0495f10 819cbb68 8027b950 e0495f6c e0495f20 80280564 819cbb44
5f20: e0495f54 00000000 8027d3d4 60000013 81978650 8198f8d4 e0495f54 7e88cec8
5f40: 83fe0000 0000000f 83fe0000 7e88cec8 0000000f 83fe0000 00000000 00000000
5f60: e0495fa4 e0495f70 80252874 8020a120 80202cc0 7e88cec8 e0495fac 00000000
5f80: 00000000 002862f4 0000001a 8020029c 83fe4800 0000001a 00000000 e0495fa8
5fa0: 80200060 80252648 00000000 00000000 0000000f 0000000f 00000000 200003c0
5fc0: 00000000 00000000 002862f4 0000001a 00000000 00006364 003d0f00 76b8b0bc
5fe0: 76b8aec0 76b8aeb0 00018af0 00133450 60000010 0000000f 00000000 00000000
Call trace: 
[<819a66f0>] (usercopy_abort) from [<804d0068>] (__check_heap_object+0xd8/0xf4 mm/slub.c:5651)
[<804cff90>] (__check_heap_object) from [<8050ef2c>] (check_heap_object mm/usercopy.c:196 [inline])
[<804cff90>] (__check_heap_object) from [<8050ef2c>] (__check_object_size mm/usercopy.c:251 [inline])
[<804cff90>] (__check_heap_object) from [<8050ef2c>] (__check_object_size+0x288/0x304 mm/usercopy.c:213)
 r8:dde88b80 r7:83fe00c4 r6:00000000 r5:00000074 r4:83fe0050
[<8050eca4>] (__check_object_size) from [<80209d94>] (check_object_size include/linux/thread_info.h:215 [inline])
[<8050eca4>] (__check_object_size) from [<80209d94>] (__copy_from_user include/linux/uaccess.h:110 [inline])
[<8050eca4>] (__check_object_size) from [<80209d94>] (user_regset_copyin include/linux/regset.h:268 [inline])
[<8050eca4>] (__check_object_size) from [<80209d94>] (fpa_set+0x90/0x118 arch/arm/kernel/ptrace.c:587)
 r10:0000001a r9:83fe4800 r8:200003c0 r7:00000000 r6:00000000 r5:00000074
 r4:83fe0050
[<80209d04>] (fpa_set) from [<8020a448>] (copy_regset_from_user include/linux/regset.h:337 [inline])
[<80209d04>] (fpa_set) from [<8020a448>] (arch_ptrace+0x334/0x424 arch/arm/kernel/ptrace.c:762)
 r6:00000000 r5:0000000c r4:200003c0
[<8020a114>] (arch_ptrace) from [<80252874>] (__do_sys_ptrace kernel/ptrace.c:1285 [inline])
[<8020a114>] (arch_ptrace) from [<80252874>] (sys_ptrace+0x238/0x4e0 kernel/ptrace.c:1258)
 r7:00000000 r6:00000000 r5:83fe0000 r4:0000000f
[<8025263c>] (sys_ptrace) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xe0495fa8 to 0xe0495ff0)
5fa0:                   00000000 00000000 0000000f 0000000f 00000000 200003c0
5fc0: 00000000 00000000 002862f4 0000001a 00000000 00006364 003d0f00 76b8b0bc
5fe0: 76b8aec0 76b8aeb0 00018af0 00133450
 r10:0000001a r9:83fe4800 r8:8020029c r7:0000001a r6:002862f4 r5:00000000
 r4:00000000
Code: e30c0b44 e3480205 e58dc000 ebfff273 (e7f001f2) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e30c0b44 	movw	r0, #52036	@ 0xcb44
   4:	e3480205 	movt	r0, #33285	@ 0x8205
   8:	e58dc000 	str	ip, [sp]
   c:	ebfff273 	bl	0xffffc9e0
* 10:	e7f001f2 	udf	#18 <-- trapping instruction