From: syzbot ci <syzbot+ciae73d4d89faf898f@syzkaller.appspotmail.com>
To: abrestic@rivosinc.com, akpm@linux-foundation.org, alex@ghiti.fr,
anshuman.khandual@arm.com, aou@eecs.berkeley.edu,
apopple@nvidia.com, ardb@kernel.org, baohua@kernel.org,
baolin.wang@linux.alibaba.com, catalin.marinas@arm.com,
chenjun102@huawei.com, david@redhat.com, dev.jain@arm.com,
liam.howlett@oracle.com, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-riscv@lists.infradead.org, lorenzo.stoakes@oracle.com,
luxu.kernel@bytedance.com, mhocko@suse.com, npache@redhat.com,
palmer@dabbelt.com, paul.walmsley@sifive.com, rppt@kernel.org,
ryan.roberts@arm.com, samuel.holland@sifive.com,
surenb@google.com, vbabka@suse.cz, wangkefeng.wang@huawei.com,
will@kernel.org, willy@infradead.org, yangyicong@hisilicon.com,
yintirui@huawei.com, yongxuan.wang@sifive.com, ziy@nvidia.com
Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com
Subject: [syzbot ci] Re: mm: add huge pfnmap support for remap_pfn_range()
Date: Tue, 23 Sep 2025 15:53:53 -0700 [thread overview]
Message-ID: <68d32501.a70a0220.4f78.0011.GAE@google.com> (raw)
In-Reply-To: <20250923133104.926672-1-yintirui@huawei.com>
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@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@googlegroups.com.
next prev parent reply other threads:[~2025-09-23 22:54 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-23 13:31 [PATCH RFC 0/2] mm: add huge pfnmap support for remap_pfn_range() Yin Tirui
2025-09-23 13:31 ` [PATCH RFC 1/2] pgtable: add pte_clrhuge() implementation for arm64 and riscv Yin Tirui
2025-09-23 13:31 ` [PATCH RFC 2/2] mm: add PMD-level huge page support for remap_pfn_range() Yin Tirui
2025-09-23 22:39 ` Matthew Wilcox
2025-09-25 2:17 ` Yin Tirui
2025-09-24 9:50 ` David Hildenbrand
2025-09-25 1:43 ` Yin Tirui
2025-09-25 9:38 ` David Hildenbrand
2025-09-23 22:53 ` syzbot ci [this message]
-- strict thread matches above, loose matches on Subject: below --
2025-10-16 11:27 [PATCH RFC v2 0/2] mm: add huge pfnmap " Yin Tirui
2025-10-16 16:23 ` [syzbot ci] " syzbot ci
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