From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f72.google.com (mail-ot1-f72.google.com [209.85.210.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3535B1ADC83 for ; Sat, 15 Aug 2026 12:36:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786797399; cv=none; b=bqm4WJoGyYYn3n0uN3y89IoPdWHwXP2+mScUSVNHuiTuQ4dG6vIUKM6ukmRPHvAE4WcV91d3UFoOdiM/J7/NTgqQuVF757FPDcxesV6KVonAz9K/XFm2xlLyeKZJOE3OV0Tz131csxB8YiGcqSaUSAzzZJw4CeerF2x0xNG3qq4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786797399; c=relaxed/simple; bh=upPbpF5Ns7qjSG+Be6PRgfPc4f8xoS3GZ+mZqvs9saw=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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2002:a05:6820:f029:b0:6b0:4a08:17d9 with SMTP id 006d021491bc7-6b0d68f6815mr9877005eaf.28.1786797397106; Sat, 15 Aug 2026 05:36:37 -0700 (PDT) Date: Sat, 15 Aug 2026 05:36:37 -0700 In-Reply-To: <6a0ca269.a70a0220.1a69d3.0014.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a805d55.dbb3a75c.20434b.0016.GAE@google.com> Subject: Re: [syzbot] [net?] WARNING in stack_depot_save_flags (2) From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, willemdebruijn.kernel@gmail.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 15ef2f78c49d Merge tag 'input-for-v7.2-rc7' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15b53279580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1d67342c314f228d dashboard link: https://syzkaller.appspot.com/bug?extid=1827030ed7bc886dd0a5 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=137fa949580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1827030ed7bc886dd0a5@syzkaller.appspotmail.com ------------[ cut here ]------------ Stack depot reached limit capacity WARNING: lib/stackdepot.c:302 at depot_init_pool lib/stackdepot.c:302 [inline], CPU#1: syz-executor190/6024 WARNING: lib/stackdepot.c:302 at depot_pop_free_pool lib/stackdepot.c:371 [inline], CPU#1: syz-executor190/6024 WARNING: lib/stackdepot.c:302 at depot_alloc_stack lib/stackdepot.c:462 [inline], CPU#1: syz-executor190/6024 WARNING: lib/stackdepot.c:302 at stack_depot_save_flags+0x9a2/0x9d0 lib/stackdepot.c:706, CPU#1: syz-executor190/6024 Modules linked in: CPU: 1 UID: 0 PID: 6024 Comm: syz-executor190 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:depot_init_pool lib/stackdepot.c:302 [inline] RIP: 0010:depot_pop_free_pool lib/stackdepot.c:371 [inline] RIP: 0010:depot_alloc_stack lib/stackdepot.c:462 [inline] RIP: 0010:stack_depot_save_flags+0x9a2/0x9d0 lib/stackdepot.c:706 Code: 0b 90 eb bf 48 85 ed 74 c6 48 89 2d 80 32 6c 16 48 89 ea 31 ed e9 0b ff ff ff 39 c1 72 1f 48 85 d2 74 20 48 8d 3d 6e e9 f9 0b <67> 48 0f b9 3a 45 31 f6 48 85 ed 0f 85 37 fa ff ff eb 92 90 0f 0b RSP: 0018:ffffc90003d5f240 EFLAGS: 00010086 RAX: 0000000000002000 RBX: 0000000000000000 RCX: 0000000000002000 RDX: ffff88804f060000 RSI: ffffffff8e387082 RDI: ffffffff914d07e0 RBP: 0000000000000000 R08: 0000000000000001 R09: 000000001f92056e R10: 00000000000000a0 R11: 0000000000000000 R12: ffffc90003d5f298 R13: 000000000000000f R14: ffff88816cc056e0 R15: ffff88816cc056e0 FS: 0000555582e6b400(0000) GS:ffff8880d5cde000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556e2ead1be0 CR3: 00000000368af000 CR4: 0000000000352ef0 Call Trace: kasan_save_stack+0x3f/0x50 mm/kasan/common.c:58 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4584 [inline] slab_alloc_node mm/slub.c:4917 [inline] kmem_cache_alloc_node_noprof+0x27d/0x6b0 mm/slub.c:4989 kmalloc_reserve+0x148/0x350 net/core/skbuff.c:615 pskb_expand_head+0x249/0x10e0 net/core/skbuff.c:2312 skb_ensure_writable+0x2e9/0x480 net/core/skbuff.c:6377 __bpf_try_make_writable net/core/filter.c:1685 [inline] bpf_try_make_writable net/core/filter.c:1691 [inline] bpf_try_make_head_writable net/core/filter.c:1699 [inline] ____bpf_clone_redirect net/core/filter.c:2491 [inline] bpf_clone_redirect+0x1f7/0x500 net/core/filter.c:2460 bpf_prog_93719f3005523967+0x168e/0x33be bpf_dispatcher_nop_func include/linux/bpf.h:1454 [inline] __bpf_prog_run include/linux/filter.h:724 [inline] bpf_prog_run include/linux/filter.h:731 [inline] bpf_test_run+0x39c/0xa40 net/bpf/test_run.c:422 bpf_prog_test_run_skb+0x15c4/0x3540 net/bpf/test_run.c:1225 bpf_prog_test_run kernel/bpf/syscall.c:4859 [inline] __sys_bpf+0x2a12/0x4e80 kernel/bpf/syscall.c:6436 __do_sys_bpf kernel/bpf/syscall.c:6537 [inline] __se_sys_bpf kernel/bpf/syscall.c:6534 [inline] __x64_sys_bpf+0xce/0x140 kernel/bpf/syscall.c:6534 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe84f88ff59 Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff9fca9ef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe84f88ff59 RDX: 0000000000000098 RSI: 00007fff9fcaa040 RDI: 000000000000000a RBP: 0000000d00000085 R08: 0000555582e74770 R09: 0000555582e74770 R10: 00007fe84f9181a0 R11: 0000000000000246 R12: 00000001000002b7 R13: 00000000000001ce R14: 0000555582e6c760 R15: 0000000000000e14 ---------------- Code disassembly (best guess): 0: 0b 90 eb bf 48 85 or -0x7ab74015(%rax),%edx 6: ed in (%dx),%eax 7: 74 c6 je 0xffffffcf 9: 48 89 2d 80 32 6c 16 mov %rbp,0x166c3280(%rip) # 0x166c3290 10: 48 89 ea mov %rbp,%rdx 13: 31 ed xor %ebp,%ebp 15: e9 0b ff ff ff jmp 0xffffff25 1a: 39 c1 cmp %eax,%ecx 1c: 72 1f jb 0x3d 1e: 48 85 d2 test %rdx,%rdx 21: 74 20 je 0x43 23: 48 8d 3d 6e e9 f9 0b lea 0xbf9e96e(%rip),%rdi # 0xbf9e998 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 45 31 f6 xor %r14d,%r14d 32: 48 85 ed test %rbp,%rbp 35: 0f 85 37 fa ff ff jne 0xfffffa72 3b: eb 92 jmp 0xffffffcf 3d: 90 nop 3e: 0f 0b ud2 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.