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Wed, 11 Feb 2026 11:35:52 -0800 (PST) Date: Wed, 11 Feb 2026 11:35:52 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <698cda18.a70a0220.2c38d7.0088.GAE@google.com> Subject: [moderation/CI] Re: mm: zone lock tracepoint instrumentation From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable syzbot ci has tested the following series [v1] mm: zone lock tracepoint instrumentation https://lore.kernel.org/all/cover.1770821420.git.d@ilvokhin.com * [PATCH 1/4] mm: introduce zone lock wrappers * [PATCH 2/4] mm: convert zone lock users to wrappers * [PATCH 3/4] mm: convert compaction to zone lock wrappers * [PATCH 4/4] mm: add tracepoints for zone lock and found the following issue: stack segment fault in dbUpdatePMap Full report is available here: https://ci.syzbot.org/series/43cf8aeb-42ac-4698-aa54-c296a912448f *** stack segment fault in dbUpdatePMap tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm= .git base: af41d136f7932e545ba8b068fa5d352304b65078 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp= 1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/9cea4e2f-a652-4347-a169-f8ad5ebd228= 4/config syz repro: https://ci.syzbot.org/findings/edbdba1b-7fc9-4625-b875-9a2af033c= b21/syz_repro Oops: stack segment: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 117 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT(ful= l)=20 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16= .2-1 04/01/2014 RIP: 0010:__list_add_valid_or_report+0x3e/0x130 lib/list_debug.c:29 Code: 00 00 00 48 89 d3 48 85 d2 0f 84 93 00 00 00 49 89 f6 49 89 ff 49 bd = 00 00 00 00 00 fc ff df 4c 8d 63 08 4c 89 e5 48 c1 ed 03 <42> 80 7c 2d 00 0= 0 74 08 4c 89 e7 e8 b2 f6 81 fd 4d 39 34 24 75 71 RSP: 0018:ffffc90003137a40 EFLAGS: 00010806 RAX: 0000000000000000 RBX: dead000000000100 RCX: 0000000000000000 RDX: dead000000000100 RSI: ffffc90002a79120 RDI: ffff88811d809ca8 RBP: 1bd5a00000000021 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000626f3c R12: dead000000000108 R13: dffffc0000000000 R14: ffffc90002a79120 R15: ffff88811d809ca8 FS: 0000000000000000(0000) GS:ffff88818e0f1000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555c51ca28 CR3: 000000011316a000 CR4: 00000000000006f0 Call Trace: __list_add_valid include/linux/list.h:96 [inline] __list_add include/linux/list.h:158 [inline] list_add include/linux/list.h:177 [inline] dbUpdatePMap+0x7ec/0xed0 fs/jfs/jfs_dmap.c:577 txAllocPMap+0x57d/0x6b0 fs/jfs/jfs_txnmgr.c:2426 txUpdateMap+0x81e/0x9c0 fs/jfs/jfs_txnmgr.c:2364 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline] jfs_lazycommit+0x43d/0xaa0 fs/jfs/jfs_txnmgr.c:2734 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_add_valid_or_report+0x3e/0x130 lib/list_debug.c:29 Code: 00 00 00 48 89 d3 48 85 d2 0f 84 93 00 00 00 49 89 f6 49 89 ff 49 bd = 00 00 00 00 00 fc ff df 4c 8d 63 08 4c 89 e5 48 c1 ed 03 <42> 80 7c 2d 00 0= 0 74 08 4c 89 e7 e8 b2 f6 81 fd 4d 39 34 24 75 71 RSP: 0018:ffffc90003137a40 EFLAGS: 00010806 RAX: 0000000000000000 RBX: dead000000000100 RCX: 0000000000000000 RDX: dead000000000100 RSI: ffffc90002a79120 RDI: ffff88811d809ca8 RBP: 1bd5a00000000021 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000626f3c R12: dead000000000108 R13: dffffc0000000000 R14: ffffc90002a79120 R15: ffff88811d809ca8 FS: 0000000000000000(0000) GS:ffff88818e0f1000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555c51ca28 CR3: 000000011316a000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 48 89 add %cl,-0x77(%rax) 5: d3 48 85 rorl %cl,-0x7b(%rax) 8: d2 0f rorb %cl,(%rdi) a: 84 93 00 00 00 49 test %dl,0x49000000(%rbx) 10: 89 f6 mov %esi,%esi 12: 49 89 ff mov %rdi,%r15 15: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 1c: fc ff df 1f: 4c 8d 63 08 lea 0x8(%rbx),%r12 23: 4c 89 e5 mov %r12,%rbp 26: 48 c1 ed 03 shr $0x3,%rbp * 2a: 42 80 7c 2d 00 00 cmpb $0x0,0x0(%rbp,%r13,1) <-- trapping instr= uction 30: 74 08 je 0x3a 32: 4c 89 e7 mov %r12,%rdi 35: e8 b2 f6 81 fd call 0xfd81f6ec 3a: 4d 39 34 24 cmp %r14,(%r12) 3e: 75 71 jne 0xb1 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. The email will later be sent to: [akpm@linux-foundation.org axelrasmussen@google.com d@ilvokhin.com david@ke= rnel.org hannes@cmpxchg.org jackmanb@google.com kernel-team@meta.com liam.h= owlett@oracle.com linux-cxl@vger.kernel.org linux-kernel@vger.kernel.org li= nux-mm@kvack.org linux-trace-kernel@vger.kernel.org lorenzo.stoakes@oracle.= com mathieu.desnoyers@efficios.com mhiramat@kernel.org mhocko@suse.com osal= vador@suse.de rostedt@goodmis.org rppt@kernel.org shakeel.butt@linux.dev su= renb@google.com vbabka@suse.cz weixugc@google.com yuanchu@google.com zhengq= i.arch@bytedance.com ziy@nvidia.com] If the report looks fine to you, reply with: #syz upstream If the report is a false positive, reply with #syz invalid