problem on linux 4.19.91 about ply HOT 7 CLOSED

# ply -dS 'k:schedule { exit(0); }'
info: creating kallsyms cache


-- globals
int stdbuf{u32}
k:schedule
{}void
    bwritevoid
        ctxvoid __bpf *
        stdbufint{u32}
        :structstruct :anon_0xb7e595d0
            0u64
            :structstruct :anon_0xb7e59590
                0int


-- locals
void __bpf *ctx
-- ir
  0     movq    r2, r1
;; >pre  {}()
;; >pre  bwrite()
;; >pre  ctx()
;; >post ctx()
;; >pre  stdbuf()
;; >post stdbuf()
;; >pre  :struct()
  1     stw     [bp - 0x4], #0x0
;; >pre  <0>
;; >post <0>
;; >pre  :struct()
;; >pre  <0>
;; >post <0>
;; >post :struct()
  2     stw     [bp - 0x8], #0x0
;; >post :struct()
  3     stq     [bp - 0x10], #0x0
;; >post bwrite()
  4     movq    r1, r2
  5     ldmap   r2, stdbuf
  6     ldw     r0, #0x0
  7     movw    r3, #-0x1
  8     movq    r4, bp
  9     addq    r4, #-0x10
 10     movw    r5, #0x10
 11     call    perf_event_output
;; >post {}()
 12     exit
error: could not create queue
error: unable to create buffer 'stdbuf'
ERR:-22
#

# ply -dS 'kretprobe:SyS_read { @["size"] = quantize(retval); }'


-- globals
quantize_(null)_t @{struct :anon_0xb7c0ef70}
kretprobe:SyS_read
{}void
    @=void
        []quantize_(null)_t
            @quantize_(null)_t{struct :anon_0xb7c0ef70}
            :structstruct :anon_0xb7c0ef70
                "size"char[8]
        quantizequantize_(null)_t
            .reg_t
                u*struct pt_regs
                    regsstruct pt_regs __bpf *
                        ctxvoid __bpf *
                "gpr3"char[8]


-- locals
long retval
struct pt_regs __bpf *regs
void __bpf *ctx
-- ir
  0     movq    r6, r1
;; >pre  {}()
;; >pre  @=()
;; >pre  []()
;; >pre  @()
;; >post @()
;; >pre  :struct()
;; >pre  "size"
;; >post "size"
  1     stw     [bp - 0x8], #0x73697a65
  2     stw     [bp - 0x4], #0x0
;; >post :struct()
;; >post []()
  3     ldmap   r1, @
  4     ldw     r0, #0x0
  5     movq    r2, bp
  6     addq    r2, #-0x8
  7     call    map_lookup_elem
  8     jeq     r0, #0x0, +6
  9     movq    r1, bp
 10     addq    r1, #-0x88
 11     movw    r2, #0x80
 12     movw    r3, r0
 13     call    probe_read
 14     ja      +16
L1:
 15     stq     [bp - 0x88], #0x0
 16     stq     [bp - 0x80], #0x0
 17     stq     [bp - 0x78], #0x0
 18     stq     [bp - 0x70], #0x0
 19     stq     [bp - 0x68], #0x0
 20     stq     [bp - 0x60], #0x0
 21     stq     [bp - 0x58], #0x0
 22     stq     [bp - 0x50], #0x0
 23     stq     [bp - 0x48], #0x0
 24     stq     [bp - 0x40], #0x0
 25     stq     [bp - 0x38], #0x0
 26     stq     [bp - 0x30], #0x0
 27     stq     [bp - 0x28], #0x0
 28     stq     [bp - 0x20], #0x0
 29     stq     [bp - 0x18], #0x0
 30     stq     [bp - 0x10], #0x0
L2:
;; >pre  quantize()
;; >pre  .()
;; >pre  u*()
;; >pre  regs()
;; >pre  ctx()
;; >post ctx()
;; >post regs()
;; >post u*()
;; >pre  "gpr3"
;; >post "gpr3"
;; >post .()
 31     movq    r3, r6
 32     addq    r3, #0xc
 33     movw    r2, #0x4
 34     movq    r1, bp
 35     addq    r1, #-0x8c
 36     call    probe_read
;; >post quantize()
 37     movw    r0, #0x0
 38     ldw     r1, [bp - 0x8c]
 39     jle     r1, #0xffff, +2
 40     addw    r0, #0x10
 41     rshq    r1, #0x10
 42     jle     r1, #0xff, +2
 43     addw    r0, #0x8
 44     rshq    r1, #0x8
 45     jle     r1, #0xf, +2
 46     addw    r0, #0x4
 47     rshq    r1, #0x4
 48     jle     r1, #0x3, +2
 49     addw    r0, #0x2
 50     rshq    r1, #0x2
 51     jle     r1, #0x1, +2
 52     addw    r0, #0x1
 53     rshq    r1, #0x1
 54     lshw    r0, #0x2
 55     movq    r1, bp
 56     addq    r1, #-0x88
 57     addq    r1, r0
 58     movw    r0, #0x1
 59     stw     r1, r0
;; >post @=()
 60     ldmap   r1, @
 61     ldw     r0, #0x0
 62     movq    r2, bp
 63     addq    r2, #-0x8
 64     movq    r3, bp
 65     addq    r3, #-0x88
 66     movw    r4, #0x0
 67     call    map_update_elem
;; >post {}()
 68     exit
ERR:-22

# grep PageSize /proc/1/smaps
KernelPageSize:        4 kB
MMUPageSize:           4 kB