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: 3944 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 : dfa39e40  ip : dfa39d88  fp : dfa39e64
r10: 0000001a  r9 : 83788000  r8 : 83dc8050
r7 : dde84020  r6 : 00000000  r5 : 00000074  r4 : 00000050
r3 : 83788000  r2 : 00000000  r1 : 00000000  r0 : 00000066
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 847d1fc0  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 83788000 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 83dc8000 pointer offset 80 size 3072
Register r9 information: slab task_struct start 83788000 pointer offset 0 size 3072
Register r10 information: non-paged memory
Register r11 information: 2-page vmalloc region starting at 0xdfa38000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2797
Register r12 information: 2-page vmalloc region starting at 0xdfa38000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2797
Process syz-executor.0 (pid: 3944, stack limit = 0xdfa38000)
Stack: (0xdfa39e40 to 0xdfa3a000)
9e40: 820000c4 81fd28a4 81fe70d0 00000050 00000074 83788000 dfa39e94 dfa39e68
9e60: 804bce1c 818d138c 00000074 dfa39e78 80215d90 83dc8050 00000074 00000000
9e80: 83dc80c4 dde84020 dfa39ecc dfa39e98 804f3ee0 804bcd50 00000074 00000001
9ea0: dfa39ebc 83dc8050 00000074 00000001 00000000 00000000 83788000 0000001a
9ec0: dfa39ef4 dfa39ed0 80209c80 804f3d00 dfa39ef4 dfa39ee0 818f5bd8 8027daec
9ee0: 00000000 0000000c dfa39f6c dfa39ef8 8020a2bc 80209bfc 00000000 00000000
9f00: dfa39f1c dfa39f10 818f5aa4 8027c158 dfa39f6c dfa39f20 80281f9c 818f5a80
9f20: dfa39f54 00000000 8027dc0c 60000013 818a3774 818bab28 dfa39f54 c7548954
9f40: 83dc8000 0000000f 83dc8000 c7548954 0000000f 83dc8000 00000001 00000000
9f60: dfa39fa4 dfa39f70 80253810 80209fd4 80202bfc c7548954 dfa39fac 00000000
9f80: 00000000 0014c2cc 0000001a 80200288 83788000 0000001a 00000000 dfa39fa8
9fa0: 80200060 802535e4 00000000 00000000 0000000f 00000007 00000001 00000000
9fc0: 00000000 00000000 0014c2cc 0000001a 7e92b326 7e92b327 003d0f00 76b2f0fc
9fe0: 76b2ef08 76b2eef8 000167e8 00050bd0 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:dde84020 r7:83dc80c4 r6:00000000 r5:00000074 r4:83dc8050
[<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 r9:83788000 r8:00000000 r7:00000000 r6:00000001 r5:00000074
 r4:83dc8050
[<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 r6:00000001 r5:83dc8000 r4:0000000f
[<802535d8>] (sys_ptrace) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xdfa39fa8 to 0xdfa39ff0)
9fa0:                   00000000 00000000 0000000f 00000007 00000001 00000000
9fc0: 00000000 00000000 0014c2cc 0000001a 7e92b326 7e92b327 003d0f00 76b2f0fc
9fe0: 76b2ef08 76b2eef8 000167e8 00050bd0
 r10:0000001a r9:83788000 r8:80200288 r7:0000001a r6:0014c2cc r5:00000000
 r4:00000000
Code: e30000c8 e3480200 e58dc000 ebfff359 (e7f001f2) 
---[ end trace 0000000000000000 ]---
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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