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: 3943 Comm: syz-executor.0 Not tainted 6.9.0-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:3926
pc : [<818d1418>]    lr : [<802bb78c>]    psr: 60000013
sp : df97de40  ip : df97dd88  fp : df97de64
r10: 0000001a  r9 : 837c3c00  r8 : 83ef0050
r7 : dde869c0  r6 : 00000000  r5 : 00000074  r4 : 00000050
r3 : 837c3c00  r2 : 00000000  r1 : 00000000  r0 : 00000066
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 849671c0  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 837c3c00 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 83ef0000 pointer offset 80 size 3072
Register r9 information: slab task_struct start 837c3c00 pointer offset 0 size 3072
Register r10 information: non-paged memory
Register r11 information: 2-page vmalloc region starting at 0xdf97c000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2797
Register r12 information: 2-page vmalloc region starting at 0xdf97c000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2797
Process syz-executor.0 (pid: 3943, stack limit = 0xdf97c000)
Stack: (0xdf97de40 to 0xdf97e000)
de40: 820000c4 81fd28a4 81fe70d0 00000050 00000074 837c3c00 df97de94 df97de68
de60: 804bce1c 818d138c 00000074 df97de78 80215d90 83ef0050 00000074 00000000
de80: 83ef00c4 dde869c0 df97decc df97de98 804f3ee0 804bcd50 00000074 00000000
dea0: df97debc 83ef0050 00000074 00000000 00000000 00000000 837c3c00 0000001a
dec0: df97def4 df97ded0 80209c80 804f3d00 df97def4 df97dee0 818f5bd8 8027daec
dee0: 00000000 0000000c df97df6c df97def8 8020a2bc 80209bfc 00000000 00000000
df00: df97df1c df97df10 818f5aa4 8027c158 df97df6c df97df20 80281f9c 818f5a80
df20: df97df54 00000000 8027dc0c 60000013 818a3774 818bab28 df97df54 676db0ab
df40: 83ef0000 0000000f 83ef0000 676db0ab 0000000f 83ef0000 00000000 00000000
df60: df97dfa4 df97df70 80253810 80209fd4 80202bfc 676db0ab df97dfac 00000000
df80: 00000000 0014c2c4 0000001a 80200288 837c3c00 0000001a 00000000 df97dfa8
dfa0: 80200060 802535e4 00000000 00000000 0000000f 00000004 00000000 00000000
dfc0: 00000000 00000000 0014c2c4 0000001a 7ea9932e 7ea9932f 003d0f00 76bd70fc
dfe0: 76bd6f08 76bd6ef8 000166a0 00050a20 60000010 0000000f 00000000 00000000
Call trace: 
[<818d1380>] (usercopy_abort) from [<804bce1c>] (__check_heap_object+0xd8/0xf4 mm/slub.c:5440)
[<804bcd44>] (__check_heap_object) from [<804f3ee0>] (check_heap_object mm/usercopy.c:196 [inline])
[<804bcd44>] (__check_heap_object) from [<804f3ee0>] (__check_object_size mm/usercopy.c:251 [inline])
[<804bcd44>] (__check_heap_object) from [<804f3ee0>] (__check_object_size+0x1ec/0x30c mm/usercopy.c:213)
 r8:dde869c0 r7:83ef00c4 r6:00000000 r5:00000074 r4:83ef0050
[<804f3cf4>] (__check_object_size) from [<80209c80>] (check_object_size include/linux/thread_info.h:215 [inline])
[<804f3cf4>] (__check_object_size) from [<80209c80>] (__copy_from_user include/linux/uaccess.h:101 [inline])
[<804f3cf4>] (__check_object_size) from [<80209c80>] (user_regset_copyin include/linux/regset.h:268 [inline])
[<804f3cf4>] (__check_object_size) from [<80209c80>] (fpa_set+0x90/0xfc arch/arm/kernel/ptrace.c:587)
 r10:0000001a r9:837c3c00 r8:00000000 r7:00000000 r6:00000000 r5:00000074
 r4:83ef0050
[<80209bf0>] (fpa_set) from [<8020a2bc>] (copy_regset_from_user include/linux/regset.h:337 [inline])
[<80209bf0>] (fpa_set) from [<8020a2bc>] (arch_ptrace+0x2f4/0x3e4 arch/arm/kernel/ptrace.c:762)
 r5:0000000c r4:00000000
[<80209fc8>] (arch_ptrace) from [<80253810>] (__do_sys_ptrace kernel/ptrace.c:1285 [inline])
[<80209fc8>] (arch_ptrace) from [<80253810>] (sys_ptrace+0x238/0x4e0 kernel/ptrace.c:1258)
 r7:00000000 r6:00000000 r5:83ef0000 r4:0000000f
[<802535d8>] (sys_ptrace) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xdf97dfa8 to 0xdf97dff0)
dfa0:                   00000000 00000000 0000000f 00000004 00000000 00000000
dfc0: 00000000 00000000 0014c2c4 0000001a 7ea9932e 7ea9932f 003d0f00 76bd70fc
dfe0: 76bd6f08 76bd6ef8 000166a0 00050a20
 r10:0000001a r9:837c3c00 r8:80200288 r7:0000001a r6:0014c2c4 r5:00000000
 r4:00000000
Code: e30000c8 e3480200 e58dc000 ebfff359 (e7f001f2) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e30000c8 	movw	r0, #200	@ 0xc8
   4:	e3480200 	movt	r0, #33280	@ 0x8200
   8:	e58dc000 	str	ip, [sp]
   c:	ebfff359 	bl	0xffffcd78
* 10:	e7f001f2 	udf	#18 <-- trapping instruction