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Message-ID: <68d32501.a70a0220.4f78.0011.GAE@google.com> Date: Tue, 23 Sep 2025 15:53:53 -0700 From: syzbot ci <syzbot+ciae73d4d89faf898f@...kaller.appspotmail.com> To: abrestic@...osinc.com, akpm@...ux-foundation.org, alex@...ti.fr, anshuman.khandual@....com, aou@...s.berkeley.edu, apopple@...dia.com, ardb@...nel.org, baohua@...nel.org, baolin.wang@...ux.alibaba.com, catalin.marinas@....com, chenjun102@...wei.com, david@...hat.com, dev.jain@....com, liam.howlett@...cle.com, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-riscv@...ts.infradead.org, lorenzo.stoakes@...cle.com, luxu.kernel@...edance.com, mhocko@...e.com, npache@...hat.com, palmer@...belt.com, paul.walmsley@...ive.com, rppt@...nel.org, ryan.roberts@....com, samuel.holland@...ive.com, surenb@...gle.com, vbabka@...e.cz, wangkefeng.wang@...wei.com, will@...nel.org, willy@...radead.org, yangyicong@...ilicon.com, yintirui@...wei.com, yongxuan.wang@...ive.com, ziy@...dia.com Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com Subject: [syzbot ci] Re: mm: add huge pfnmap support for remap_pfn_range() syzbot ci has tested the following series [v1] mm: add huge pfnmap support for remap_pfn_range() https://lore.kernel.org/all/20250923133104.926672-1-yintirui@huawei.com * [PATCH RFC 1/2] pgtable: add pte_clrhuge() implementation for arm64 and riscv * [PATCH RFC 2/2] mm: add PMD-level huge page support for remap_pfn_range() and found the following issues: * BUG: non-zero pgtables_bytes on freeing mm: NUM * stack segment fault in pgtable_trans_huge_withdraw Full report is available here: https://ci.syzbot.org/series/633cbff7-ef54-4f3a-9133-71cc271396ee *** BUG: non-zero pgtables_bytes on freeing mm: NUM tree: torvalds URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux base: 07e27ad16399afcd693be20211b0dfae63e0615f arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/72b4b6cf-5400-40d6-94b6-1cfc0e85050d/config C repro: https://ci.syzbot.org/findings/3450ef75-3540-4c00-8b33-5625d4aa40ef/c_repro syz repro: https://ci.syzbot.org/findings/3450ef75-3540-4c00-8b33-5625d4aa40ef/syz_repro BUG: non-zero pgtables_bytes on freeing mm: 4096 *** stack segment fault in pgtable_trans_huge_withdraw tree: torvalds URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux base: 07e27ad16399afcd693be20211b0dfae63e0615f arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/72b4b6cf-5400-40d6-94b6-1cfc0e85050d/config C repro: https://ci.syzbot.org/findings/dcfb72b5-c263-48da-830a-7f51aaa927db/c_repro syz repro: https://ci.syzbot.org/findings/dcfb72b5-c263-48da-830a-7f51aaa927db/syz_repro Oops: stack segment: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 6000 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:pgtable_trans_huge_withdraw+0x115/0x310 mm/pgtable-generic.c:188 Code: c3 10 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 5d 38 13 00 48 8b 03 48 89 04 24 4c 8d 78 08 4c 89 fd 48 c1 ed 03 <42> 80 7c 2d 00 00 74 08 4c 89 ff e8 3b 38 13 00 49 8b 07 48 8d 48 RSP: 0018:ffffc90002d5f300 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffffea0000fb3dd0 RCX: ffff888107769cc0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffff888022b90843 R09: 1ffff11004572108 R10: dffffc0000000000 R11: ffffed1004572109 R12: ffff88803ecf7000 R13: dffffc0000000000 R14: ffff88803ecf7000 R15: 0000000000000008 FS: 0000555576e7a500(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000107d74000 CR4: 00000000000006f0 Call Trace: <TASK> zap_deposited_table mm/huge_memory.c:2177 [inline] zap_huge_pmd+0xa25/0xf50 mm/huge_memory.c:2205 zap_pmd_range mm/memory.c:1798 [inline] zap_pud_range mm/memory.c:1847 [inline] zap_p4d_range mm/memory.c:1868 [inline] unmap_page_range+0x9fe/0x4370 mm/memory.c:1889 unmap_single_vma mm/memory.c:1932 [inline] unmap_vmas+0x399/0x580 mm/memory.c:1976 exit_mmap+0x248/0xb50 mm/mmap.c:1280 __mmput+0x118/0x430 kernel/fork.c:1129 copy_process+0x2910/0x3c00 kernel/fork.c:2454 kernel_clone+0x21e/0x840 kernel/fork.c:2605 __do_sys_clone kernel/fork.c:2748 [inline] __se_sys_clone kernel/fork.c:2732 [inline] __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2732 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f96b638ec29 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc07e618c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f96b65d5fa0 RCX: 00007f96b638ec29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000002001000 RBP: 00007f96b6411e41 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f96b65d5fa0 R14: 00007f96b65d5fa0 R15: 0000000000000006 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:pgtable_trans_huge_withdraw+0x115/0x310 mm/pgtable-generic.c:188 Code: c3 10 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 5d 38 13 00 48 8b 03 48 89 04 24 4c 8d 78 08 4c 89 fd 48 c1 ed 03 <42> 80 7c 2d 00 00 74 08 4c 89 ff e8 3b 38 13 00 49 8b 07 48 8d 48 RSP: 0018:ffffc90002d5f300 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffffea0000fb3dd0 RCX: ffff888107769cc0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffff888022b90843 R09: 1ffff11004572108 R10: dffffc0000000000 R11: ffffed1004572109 R12: ffff88803ecf7000 R13: dffffc0000000000 R14: ffff88803ecf7000 R15: 0000000000000008 FS: 0000555576e7a500(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000107d74000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess): 0: c3 ret 1: 10 48 89 adc %cl,-0x77(%rax) 4: d8 48 c1 fmuls -0x3f(%rax) 7: e8 03 42 80 3c call 0x3c80420f c: 28 00 sub %al,(%rax) e: 74 08 je 0x18 10: 48 89 df mov %rbx,%rdi 13: e8 5d 38 13 00 call 0x133875 18: 48 8b 03 mov (%rbx),%rax 1b: 48 89 04 24 mov %rax,(%rsp) 1f: 4c 8d 78 08 lea 0x8(%rax),%r15 23: 4c 89 fd mov %r15,%rbp 26: 48 c1 ed 03 shr $0x3,%rbp * 2a: 42 80 7c 2d 00 00 cmpb $0x0,0x0(%rbp,%r13,1) <-- trapping instruction 30: 74 08 je 0x3a 32: 4c 89 ff mov %r15,%rdi 35: e8 3b 38 13 00 call 0x133875 3a: 49 8b 07 mov (%r15),%rax 3d: 48 rex.W 3e: 8d .byte 0x8d 3f: 48 rex.W *** 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@...kaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@...glegroups.com.
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