==================================================================
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1aa1/0x22d0
Read of size 8 at addr ffff888043387680 by task syz-executor.6/6335
CPU: 0 PID: 6335 Comm: syz-executor.6 Not tainted 6.2.0-rc8-next-20230217 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0x91/0xf0
print_report+0xcc/0x620
kasan_report+0xc0/0xf0
unwind_next_frame+0x1aa1/0x22d0
arch_stack_walk+0x87/0xf0
stack_trace_save+0x90/0xd0
kasan_save_stack+0x22/0x50
kasan_set_track+0x25/0x30
kasan_save_free_info+0x2e/0x50
__kasan_slab_free+0x10a/0x190
kmem_cache_free+0xff/0x510
rcu_core+0x822/0x1d40
__do_softirq+0x258/0x8a2
__irq_exit_rcu+0xcc/0x110
irq_exit_rcu+0x9/0x20
sysvec_apic_timer_interrupt+0x6e/0x90
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:strlen+0x6d/0xa0
Code: 48 83 c0 01 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 0f b6 14 1a 38 ca 7f 04 84 d2 75 27 80 38 00 75 de 48 83 c4 08 48 29 e8 5b <5d> e9 11 b8 05 00 48 83 c4 08 31 c0 5b 5d e9 04 b8 05 00 e8 7b 2e
RSP: 0018:ffff8880433875e0 EFLAGS: 00000202
RAX: 000000000000000d RBX: ffff888018e9f790 RCX: 0000000000000005
RDX: 0000000000000006 RSI: ffffffff85b615b8 RDI: ffffffff84d2b7c0
RBP: ffffffff84d2b7c0 R08: 0000000000000000 R09: 0000000000000001
R10: fffffbfff0ba4bca R11: 0000000000000001 R12: 0000000000000000
R13: 1ffff11008670ec5 R14: ffff8880433876a8 R15: ffffffff8550e200
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:write_comp_data+0x3c/0x90
Code: 81 e6 00 01 00 00 65 48 8b 14 25 80 89 03 00 a9 00 01 ff 00 74 0e 85 f6 74 59 8b 82 0c 14 00 00 85 c0 74 4f 8b 82 e8 13 00 00 <83> f8 03 75 44 48 8b 82 f0 13 00 00 8b 92 ec 13 00 00 48 8b 38 48
RSP: 0018:ffff8880433876a0 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff85b615b8 RCX: ffffffff83688158
RDX: ffff888044f19ac0 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 1ffff11008670ec5 R08: 0000000000000006 R09: ffffffff812b6430
R10: ffffffff851c50f8 R11: 0000000041b58ab3 R12: ffffffff85b615d0
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888016a55800
The buggy address belongs to stack of task syz-executor.6/6335
and is located at offset 88 in frame:
perf_trace_lock_acquire+0x0/0x500
This frame has 2 objects:
[48, 52) 'rctx'
[64, 72) '__regs'
The buggy address belongs to the physical page:
page:0000000061258b1d refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x43387
flags: 0x100000000000000(node=0|zone=1)
raw: 0100000000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888043387580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888043387600: 00 00 00 00 00 f1 f1 f1 f1 f1 f1 04 f2 00 f3 f3
>ffff888043387680: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
^
ffff888043387700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888043387780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 48 83 c0 01 add $0x1,%rax
4: 48 89 c2 mov %rax,%rdx
7: 48 89 c1 mov %rax,%rcx
a: 48 c1 ea 03 shr $0x3,%rdx
e: 83 e1 07 and $0x7,%ecx
11: 0f b6 14 1a movzbl (%rdx,%rbx,1),%edx
15: 38 ca cmp %cl,%dl
17: 7f 04 jg 0x1d
19: 84 d2 test %dl,%dl
1b: 75 27 jne 0x44
1d: 80 38 00 cmpb $0x0,(%rax)
20: 75 de jne 0x0
22: 48 83 c4 08 add $0x8,%rsp
26: 48 29 e8 sub %rbp,%rax
29: 5b pop %rbx
* 2a: 5d pop %rbp <-- trapping instruction
2b: e9 11 b8 05 00 jmpq 0x5b841
30: 48 83 c4 08 add $0x8,%rsp
34: 31 c0 xor %eax,%eax
36: 5b pop %rbx
37: 5d pop %rbp
38: e9 04 b8 05 00 jmpq 0x5b841
3d: e8 .byte 0xe8
3e: 7b 2e jnp 0x6e