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Wed, 22 Oct 2025 14:43:34 GMT Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 566AF20040; Wed, 22 Oct 2025 14:43:34 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DACD120043; Wed, 22 Oct 2025 14:43:33 +0000 (GMT) Received: from tuxmaker.lnxne.boe (unknown [9.152.85.9]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 22 Oct 2025 14:43:33 +0000 (GMT) From: Jens Remus To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, Steven Rostedt Cc: Jens Remus , Josh Poimboeuf , Masami Hiramatsu , Mathieu Desnoyers , Peter Zijlstra , Ingo Molnar , Jiri Olsa , Arnaldo Carvalho de Melo , Namhyung Kim , Thomas Gleixner , Andrii Nakryiko , Indu Bhagat , "Jose E. Marchesi" , Beau Belgrave , Linus Torvalds , Andrew Morton , Florian Weimer , Kees Cook , "Carlos O'Donell" , Sam James , Borislav Petkov , Dave Hansen , David Hildenbrand , "H. Peter Anvin" , "Liam R. Howlett" , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , Heiko Carstens , Vasily Gorbik , "Steven Rostedt (Google)" Subject: [PATCH v11 13/15] unwind_user/sframe: Show file name in debug output Date: Wed, 22 Oct 2025 16:43:24 +0200 Message-ID: <20251022144326.4082059-14-jremus@linux.ibm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20251022144326.4082059-1-jremus@linux.ibm.com> References: <20251022144326.4082059-1-jremus@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: rtHXrH2eN70zs9auQQr1YBdLWm62ERFj X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDE4MDAyMiBTYWx0ZWRfX3c8tnlsreEy/ Con0RpxsbePMBMTSF4oAo7LIPrZCopCPOhvnrJARPRRDiHxHFczOhD8otf/Z+u9TNte0jRURx7c 1suEdhIrbLzeqtw3pqQ8mquXKHL9i1Wgscd6TYt41kHjJspVtEqqTQ2XLWn7PlWAK5XtJNIFA6E 35tPwTgk/HuYB+yH/TJNL+Nc9aShYJq6KueqEJ24eZukzz2MioOVwW9K9TonqYqbeO3CicvgaSU buZ3yovPW+QhWpddlMROAGqfyxrOHbDpQNmc1Fw3JSjB8LZ7gkThuemOotyS57gDg5r4+w3SSBJ 2lv3ekDfd+4fnpAAbg6n9nChtNVrtdL9BhlLnkLI1wtZ/fIhYUzJ9/RJ2LLaOrTY1A0ldm5lwxB 4wU92xb4+ab12VgZUHsydpGUFU10hw== X-Authority-Analysis: v=2.4 cv=MIJtWcZl c=1 sm=1 tr=0 ts=68f8ed9c cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=x6icFKpwvdMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=7d_E57ReAAAA:8 a=JfrnYn6hAAAA:8 a=yPCof4ZbAAAA:8 a=mDV3o1hIAAAA:8 a=yMhMjlubAAAA:8 a=VnNF1IyMAAAA:8 a=Z4Rwk6OoAAAA:8 a=20KFwNOVAAAA:8 a=7mOBRU54AAAA:8 a=meVymXHHAAAA:8 a=ZGhggJSn0wbQYAgsgMcA:9 a=jhqOcbufqs7Y1TYCrUUU:22 a=1CNFftbPRP8L7MoqJWF3:22 a=HkZW87K1Qel5hWWM3VKY:22 a=wa9RWnbW_A1YIeRBVszw:22 a=2JgSa4NbpEOStq-L5dxp:22 a=DXsff8QfwkrTrK3sU8N1:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=bWyr8ysk75zN3GCy5bjg:22 X-Proofpoint-ORIG-GUID: dtlitkvYqoa9ESUzD-Y7r3YM5QDW7Rnw X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-22_05,2025-10-13_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 spamscore=0 phishscore=0 lowpriorityscore=0 adultscore=0 clxscore=1015 impostorscore=0 bulkscore=0 priorityscore=1501 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510020000 definitions=main-2510180022 X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 725B020003 X-Stat-Signature: g4eyrc5hcyi3nyaeb67sezqmrnjsxwoy X-Rspam-User: X-HE-Tag: 1761153622-865816 X-HE-Meta: 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 R3owClmH 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Josh Poimboeuf When debugging sframe issues, the error messages aren't all that helpful without knowing what file a corresponding .sframe section belongs to. Prefix debug output strings with the file name. Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Jiri Olsa Cc: Arnaldo Carvalho de Melo Cc: Namhyung Kim Cc: Thomas Gleixner Cc: Andrii Nakryiko Cc: Indu Bhagat Cc: "Jose E. Marchesi" Cc: Beau Belgrave Cc: Jens Remus Cc: Linus Torvalds Cc: Andrew Morton Cc: Florian Weimer Cc: Sam James Cc: Kees Cook Cc: "Carlos O'Donell" Signed-off-by: Josh Poimboeuf Signed-off-by: Steven Rostedt (Google) Signed-off-by: Jens Remus --- include/linux/sframe.h | 4 +++- kernel/unwind/sframe.c | 23 ++++++++++-------- kernel/unwind/sframe_debug.h | 45 +++++++++++++++++++++++++++++++----- 3 files changed, 56 insertions(+), 16 deletions(-) diff --git a/include/linux/sframe.h b/include/linux/sframe.h index 9a72209696f9..b79c5ec09229 100644 --- a/include/linux/sframe.h +++ b/include/linux/sframe.h @@ -10,7 +10,9 @@ struct sframe_section { struct rcu_head rcu; - +#ifdef CONFIG_DYNAMIC_DEBUG + const char *filename; +#endif unsigned long sframe_start; unsigned long sframe_end; unsigned long text_start; diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c index 77ef1f0bb9c5..82eaf3c5d6b0 100644 --- a/kernel/unwind/sframe.c +++ b/kernel/unwind/sframe.c @@ -331,14 +331,17 @@ int sframe_find(unsigned long ip, struct unwind_user_frame *frame) end: user_read_access_end(); - if (ret == -EFAULT) + if (ret == -EFAULT) { + dbg_sec("removing bad .sframe section\n"); WARN_ON_ONCE(sframe_remove_section(sec->sframe_start)); + } return ret; } static void free_section(struct sframe_section *sec) { + dbg_free(sec); kfree(sec); } @@ -349,7 +352,7 @@ static int sframe_read_header(struct sframe_section *sec) unsigned int num_fdes; if (copy_from_user(&shdr, (void __user *)sec->sframe_start, sizeof(shdr))) { - dbg("header usercopy failed\n"); + dbg_sec("header usercopy failed\n"); return -EFAULT; } @@ -358,18 +361,18 @@ static int sframe_read_header(struct sframe_section *sec) !(shdr.preamble.flags & SFRAME_F_FDE_SORTED) || !(shdr.preamble.flags & SFRAME_F_FDE_FUNC_START_PCREL) || shdr.auxhdr_len) { - dbg("bad/unsupported sframe header\n"); + dbg_sec("bad/unsupported sframe header\n"); return -EINVAL; } if (!shdr.num_fdes || !shdr.num_fres) { - dbg("no fde/fre entries\n"); + dbg_sec("no fde/fre entries\n"); return -EINVAL; } header_end = sec->sframe_start + SFRAME_HEADER_SIZE(shdr); if (header_end >= sec->sframe_end) { - dbg("header doesn't fit in section\n"); + dbg_sec("header doesn't fit in section\n"); return -EINVAL; } @@ -381,7 +384,7 @@ static int sframe_read_header(struct sframe_section *sec) fres_end = fres_start + shdr.fre_len; if (fres_start < fdes_end || fres_end > sec->sframe_end) { - dbg("inconsistent fde/fre offsets\n"); + dbg_sec("inconsistent fde/fre offsets\n"); return -EINVAL; } @@ -437,6 +440,8 @@ int sframe_add_section(unsigned long sframe_start, unsigned long sframe_end, sec->text_start = text_start; sec->text_end = text_end; + dbg_init(sec); + ret = sframe_read_header(sec); if (ret) { dbg_print_header(sec); @@ -445,8 +450,8 @@ int sframe_add_section(unsigned long sframe_start, unsigned long sframe_end, ret = mtree_insert_range(sframe_mt, sec->text_start, sec->text_end, sec, GFP_KERNEL); if (ret) { - dbg("mtree_insert_range failed: text=%lx-%lx\n", - sec->text_start, sec->text_end); + dbg_sec("mtree_insert_range failed: text=%lx-%lx\n", + sec->text_start, sec->text_end); goto err_free; } @@ -468,7 +473,7 @@ static int __sframe_remove_section(struct mm_struct *mm, struct sframe_section *sec) { if (!mtree_erase(&mm->sframe_mt, sec->text_start)) { - dbg("mtree_erase failed: text=%lx\n", sec->text_start); + dbg_sec("mtree_erase failed: text=%lx\n", sec->text_start); return -EINVAL; } diff --git a/kernel/unwind/sframe_debug.h b/kernel/unwind/sframe_debug.h index 055c8c8fae24..7794bf0bd78c 100644 --- a/kernel/unwind/sframe_debug.h +++ b/kernel/unwind/sframe_debug.h @@ -10,26 +10,59 @@ #define dbg(fmt, ...) \ pr_debug("%s (%d): " fmt, current->comm, current->pid, ##__VA_ARGS__) +#define dbg_sec(fmt, ...) \ + dbg("%s: " fmt, sec->filename, ##__VA_ARGS__) + static __always_inline void dbg_print_header(struct sframe_section *sec) { unsigned long fdes_end; fdes_end = sec->fdes_start + (sec->num_fdes * sizeof(struct sframe_fde)); - dbg("SEC: sframe:0x%lx-0x%lx text:0x%lx-0x%lx " - "fdes:0x%lx-0x%lx fres:0x%lx-0x%lx " - "ra_off:%d fp_off:%d\n", - sec->sframe_start, sec->sframe_end, sec->text_start, sec->text_end, - sec->fdes_start, fdes_end, sec->fres_start, sec->fres_end, - sec->ra_off, sec->fp_off); + dbg_sec("SEC: sframe:0x%lx-0x%lx text:0x%lx-0x%lx " + "fdes:0x%lx-0x%lx fres:0x%lx-0x%lx " + "ra_off:%d fp_off:%d\n", + sec->sframe_start, sec->sframe_end, sec->text_start, sec->text_end, + sec->fdes_start, fdes_end, sec->fres_start, sec->fres_end, + sec->ra_off, sec->fp_off); +} + +static inline void dbg_init(struct sframe_section *sec) +{ + struct mm_struct *mm = current->mm; + struct vm_area_struct *vma; + + guard(mmap_read_lock)(mm); + vma = vma_lookup(mm, sec->sframe_start); + if (!vma) + sec->filename = kstrdup("(vma gone???)", GFP_KERNEL); + else if (vma->vm_file) + sec->filename = kstrdup_quotable_file(vma->vm_file, GFP_KERNEL); + else if (vma->vm_ops && vma->vm_ops->name) + sec->filename = kstrdup(vma->vm_ops->name(vma), GFP_KERNEL); + else if (arch_vma_name(vma)) + sec->filename = kstrdup(arch_vma_name(vma), GFP_KERNEL); + else if (!vma->vm_mm) + sec->filename = kstrdup("(vdso)", GFP_KERNEL); + else + sec->filename = kstrdup("(anonymous)", GFP_KERNEL); +} + +static inline void dbg_free(struct sframe_section *sec) +{ + kfree(sec->filename); } #else /* !CONFIG_DYNAMIC_DEBUG */ #define dbg(args...) no_printk(args) +#define dbg_sec(args... ) no_printk(args) static inline void dbg_print_header(struct sframe_section *sec) {} +static inline void dbg_init(struct sframe_section *sec) {} +static inline void dbg_free(struct sframe_section *sec) {} + #endif /* !CONFIG_DYNAMIC_DEBUG */ #endif /* _SFRAME_DEBUG_H */ -- 2.48.1