Bug 2042238
| Summary: | [bcc-tools] compactsnoop aborted with "Error at line 82: Unsupport signed division..." | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 8 | Reporter: | Shizhao Chen <shichen> |
| Component: | bcc | Assignee: | Jerome Marchand <jmarchan> |
| Status: | CLOSED ERRATA | QA Contact: | Ziqian SUN (Zamir) <zsun> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 8.6 | CC: | jmarchan, rdossant, zsun |
| Target Milestone: | rc | Keywords: | Triaged |
| Target Release: | --- | Flags: | pm-rhel:
mirror+
|
| Hardware: | x86_64 | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | bcc-0.25.0-5.el8 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2023-11-14 15:34:38 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
FYI, 84z has the same issue:
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:: Error messages generated for './compactsnoop --timestamp --duration 10 --kernel-stack --extended_fields'
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
In file included from <built-in>:2:
In file included from /virtual/include/bcc/bpf.h:12:
In file included from include/linux/types.h:6:
In file included from include/uapi/linux/types.h:14:
In file included from include/uapi/linux/posix_types.h:5:
In file included from include/linux/stddef.h:5:
In file included from include/uapi/linux/stddef.h:2:
In file included from include/linux/compiler_types.h:78:
include/linux/compiler-clang.h:29:9: warning: '__no_sanitize_address' macro redefined [-Wmacro-redefined]
#define __no_sanitize_address
^
include/linux/compiler-gcc.h:339:9: note: previous definition is here
#define __no_sanitize_address __attribute__((no_sanitize_address))
^
1 warning generated.
bpf: Failed to load program: Permission denied
; int ret = (int)ctx->args[2];
0: (79) r2 = *(u64 *)(r1 +16)
; int ret = (int)ctx->args[2];
1: (67) r2 <<= 32
2: (77) r2 >>= 32
; if(ret != COMPACT_CONTINUE)
3: (55) if r2 != 0x4 goto pc+123
R1=ctx(id=0,off=0,imm=0) R2_w=inv4 R10=fp0
;
4: (79) r2 = *(u64 *)(r1 +8)
5: (7b) *(u64 *)(r10 -104) = r2
6: (79) r6 = *(u64 *)(r1 +0)
; id = bpf_get_current_pid_tgid();
7: (85) call bpf_get_current_pid_tgid#14
; id = bpf_get_current_pid_tgid();
8: (7b) *(u64 *)(r10 -16) = r0
; struct val_t *valp = bpf_map_lookup_elem((void *)bpf_pseudo_fd(1, -1), &id);
9: (18) r1 = 0xffff9585c6b6ac00
11: (bf) r2 = r10
;
12: (07) r2 += -16
; struct val_t *valp = bpf_map_lookup_elem((void *)bpf_pseudo_fd(1, -1), &id);
13: (85) call bpf_map_lookup_elem#1
14: (bf) r8 = r0
;
15: (bf) r7 = r8
16: (07) r7 += 4
R7 pointer arithmetic on map_value_or_null prohibited, null-check it first
processed 16 insns (limit 1000000) max_states_per_insn 0 total_states 1 peak_states 1 mark_read 1
Traceback (most recent call last):
File "./compactsnoop", line 291, in <module>
b = BPF(text=bpf_text)
File "/usr/lib/python3.6/site-packages/bcc/__init__.py", line 372, in __init__
self._trace_autoload()
File "/usr/lib/python3.6/site-packages/bcc/__init__.py", line 1243, in _trace_autoload
fn = self.load_func(func_name, BPF.RAW_TRACEPOINT)
File "/usr/lib/python3.6/site-packages/bcc/__init__.py", line 412, in load_func
(func_name, errstr))
Exception: Failed to load BPF program b'raw_tracepoint__mm_compaction_suitable': Permission denied
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (bcc bug fix and enhancement update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2023:7001 |
Description of problem: `compactsnoop' aborted when executed. Version-Release number of selected component (if applicable): kernel-devel-4.18.0-359.el8.x86_64 bcc-0.19.0-5.el8.x86_64 bcc-tools-0.19.0-5.el8.x86_64 How reproducible: always Steps to Reproduce: 1. /usr/share/bcc/tools/compactsnoop 2. 3. Actual results: [root@ci-vm-10-0-139-181 tools]# ./compactsnoop Error at line 82: Unsupport signed division for DAG: 0x563f86a77fa0: i64 = sdiv exact 0x563f85704ea8, Constant:i64<1472>, /virtual/main.c:82:17 @[ /virtual/main.c:159:17 @[ /virtual/main.c:192:5 ] ]Please convert to unsigned div/mod. LLVM ERROR: Cannot select: 0x563f86a77fa0: i64 = sdiv exact 0x563f85704ea8, Constant:i64<1472>, /virtual/main.c:82:17 @[ /virtual/main.c:159:17 @[ /virtual/main.c:192:5 ] ] 0x563f85704ea8: i64 = sub 0x563f86a77b28, 0x563f86a780d8, /virtual/main.c:82:17 @[ /virtual/main.c:159:17 @[ /virtual/main.c:192:5 ] ] 0x563f86a77b28: i64,ch = CopyFromReg 0x563f844640e8, Register:i64 %0, /virtual/main.c:168:25 0x563f86a77d30: i64 = Register %0 0x563f86a780d8: i64,ch = load<(dereferenceable load (s64) from %ir.2, !tbaa !2713)> 0x563f85705320, FrameIndex:i64<0>, undef:i64, /virtual/main.c:82:19 @[ /virtual/main.c:159:17 @[ /virtual/main.c:192:5 ] ] 0x563f86a776b0: i64 = FrameIndex<0> 0x563f86a77920: i64 = undef 0x563f86a77f38: i64 = Constant<1472> In function: raw_tracepoint__mm_compaction_suitable Aborted (core dumped) Expected results: Proceed without error. Additional info: An identical bug for rhel9 filed at bz2042236.