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: 1 PID: 3995 Comm: syz-executor.0 Not tainted 6.9.0-rc6-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 : [<818a83c4>]    lr : [<802ba7b0>]    psr: 60000013
sp : dfb41e40  ip : dfb41d88  fp : dfb41e64
r10: 0000001a  r9 : 836bc800  r8 : 836ba450
r7 : dde741e0  r6 : 00000000  r5 : 00000074  r4 : 00000050
r3 : 836bc800  r2 : 00000000  r1 : 00000000  r0 : 00000066
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 85045440  DAC: 00000000
Register r0 information: non-paged memory
Register r1 information: NULL pointer
Register r2 information: NULL pointer
Register r3 information: slab task_struct start 836bc800 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 836ba400 pointer offset 80 size 3072
Register r9 information: slab task_struct start 836bc800 pointer offset 0 size 3072
Register r10 information: non-paged memory
Register r11 information: 2-page vmalloc region starting at 0xdfb40000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797
Register r12 information: 2-page vmalloc region starting at 0xdfb40000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2797
Process syz-executor.0 (pid: 3995, stack limit = 0xdfb40000)
Stack: (0xdfb41e40 to 0xdfb42000)
1e40: 81fec750 81fbf360 81fd398c 00000050 00000074 836bc800 dfb41e94 dfb41e68
1e60: 804b82ec 818a8338 00000074 dfb41e78 80216314 836ba450 00000074 00000000
1e80: 836ba4c4 dde741e0 dfb41ecc dfb41e98 804ef490 804b8220 00000074 00000000
1ea0: dfb41ebc 836ba450 00000074 00000000 00000000 200001c0 836bc800 0000001a
1ec0: dfb41ef4 dfb41ed0 8020a0e4 804ef2b0 dfb41ef4 dfb41ee0 818cccd8 8027ca24
1ee0: 200001c0 0000000c dfb41f6c dfb41ef8 8020a724 8020a060 00000000 200001c0
1f00: dfb41f1c dfb41f10 818ccba4 8027b0cc dfb41f6c dfb41f20 80280ed0 818ccb80
1f20: dfb41f54 00000000 8027cb44 60000013 8187a7a4 81891b44 dfb41f54 1e2177a9
1f40: 836ba400 0000000f 836ba400 1e2177a9 0000000f 836ba400 00000000 00000000
1f60: dfb41fa4 dfb41f70 80253570 8020a43c 80203054 1e2177a9 dfb41fac 00000000
1f80: 00000000 0014c2cc 0000001a 80200288 836bc800 0000001a 00000000 dfb41fa8
1fa0: 80200060 80253340 00000000 00000000 0000000f 0000004e 00000000 200001c0
1fc0: 00000000 00000000 0014c2cc 0000001a 7ed3f32e 7ed3f32f 003d0f00 76b740fc
1fe0: 76b73f08 76b73ef8 00016ab0 00050bf0 60000010 0000000f 00000000 00000000
Call trace: 
[<818a832c>] (usercopy_abort) from [<804b82ec>] (__check_heap_object+0xd8/0xf4 mm/slub.c:5370)
[<804b8214>] (__check_heap_object) from [<804ef490>] (check_heap_object mm/usercopy.c:196 [inline])
[<804b8214>] (__check_heap_object) from [<804ef490>] (__check_object_size mm/usercopy.c:251 [inline])
[<804b8214>] (__check_heap_object) from [<804ef490>] (__check_object_size+0x1ec/0x30c mm/usercopy.c:213)
 r8:dde741e0 r7:836ba4c4 r6:00000000 r5:00000074 r4:836ba450
[<804ef2a4>] (__check_object_size) from [<8020a0e4>] (check_object_size include/linux/thread_info.h:215 [inline])
[<804ef2a4>] (__check_object_size) from [<8020a0e4>] (__copy_from_user include/linux/uaccess.h:101 [inline])
[<804ef2a4>] (__check_object_size) from [<8020a0e4>] (user_regset_copyin include/linux/regset.h:268 [inline])
[<804ef2a4>] (__check_object_size) from [<8020a0e4>] (fpa_set+0x90/0xfc arch/arm/kernel/ptrace.c:587)
 r10:0000001a r9:836bc800 r8:200001c0 r7:00000000 r6:00000000 r5:00000074
 r4:836ba450
[<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 r5:836ba400 r4:0000000f
[<80253334>] (sys_ptrace) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xdfb41fa8 to 0xdfb41ff0)
1fa0:                   00000000 00000000 0000000f 0000004e 00000000 200001c0
1fc0: 00000000 00000000 0014c2cc 0000001a 7ed3f32e 7ed3f32f 003d0f00 76b740fc
1fe0: 76b73f08 76b73ef8 00016ab0 00050bf0
 r10:0000001a r9:836bc800 r8:80200288 r7:0000001a r6:0014c2cc r5:00000000
 r4:00000000
Code: e30c0754 e34801fe e58dc000 ebfff359 (e7f001f2) 
---[ end trace 0000000000000000 ]---
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Code disassembly (best guess):
   0:	e30c0754 	movw	r0, #51028	@ 0xc754
   4:	e34801fe 	movt	r0, #33278	@ 0x81fe
   8:	e58dc000 	str	ip, [sp]
   c:	ebfff359 	bl	0xffffcd78
* 10:	e7f001f2 	udf	#18 <-- trapping instruction