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Mon, 28 Jul 2025 11:29:35 -0700 (PDT) Date: Mon, 28 Jul 2025 11:29:35 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6887c18f.a00a0220.b12ec.00ab.GAE@google.com> Subject: [syzbot] [mm?] WARNING: locking bug in __percpu_counter_limited_add From: syzbot To: akpm@linux-foundation.org, baolin.wang@linux.alibaba.com, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Queue-Id: B9265140004 X-Rspamd-Server: rspam06 X-Stat-Signature: n3jwo7jhmgwm6xyd6ix1m3wi4jsuz4ic X-HE-Tag: 1753727376-674735 X-HE-Meta: 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 6BPwWYJF 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 Ab+qQh2j 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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: Hello, syzbot found the following issue on: HEAD commit: 94619ea2d933 Merge tag 'ipsec-next-2025-07-23' of git://gi.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=1327c0a2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ceda48240b85ec34 dashboard link: https://syzkaller.appspot.com/bug?extid=57a2bb6f53fad29bd29c compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/afd64d9816ee/disk-94619ea2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e1755ce1f83b/vmlinux-94619ea2.xz kernel image: https://storage.googleapis.com/syzbot-assets/2061dff2fbf4/bzImage-94619ea2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+57a2bb6f53fad29bd29c@syzkaller.appspotmail.com ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(!test_bit(class_idx, lock_classes_in_use)) WARNING: CPU: 0 PID: 20124 at kernel/locking/lockdep.c:5210 __lock_acquire+0xc0c/0xd20 kernel/locking/lockdep.c:5210 Modules linked in: CPU: 0 UID: 0 PID: 20124 Comm: syz.3.4335 Not tainted 6.16.0-rc6-syzkaller-01673-g94619ea2d933 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__lock_acquire+0xc0c/0xd20 kernel/locking/lockdep.c:5210 Code: ff ff 90 e8 36 ad 1e 03 85 c0 74 22 83 3d 2f 14 04 0e 00 75 19 90 48 c7 c7 1d b7 b8 8d 48 c7 c6 ff 5b a0 8d e8 25 cb e5 ff 90 <0f> 0b 90 90 90 e9 8f 00 00 00 90 0f 0b 90 e9 8d fe ff ff 90 e8 fb RSP: 0018:ffffc9000524f5c0 EFLAGS: 00010046 RAX: b837b7aac7381900 RBX: 0000000000000003 RCX: 0000000000080000 RDX: ffffc90011215000 RSI: 000000000000cba4 RDI: 000000000000cba5 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bfaa6c R12: 0000000000000004 R13: 0000000000000002 R14: ffff8880251d4768 R15: 0000000000000000 FS: 00007f1c62b736c0(0000) GS:ffff888125c15000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000003e000 CR3: 0000000075eea000 CR4: 00000000003526f0 Call Trace: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __percpu_counter_limited_add+0x22d/0x710 lib/percpu_counter.c:351 percpu_counter_limited_add include/linux/percpu_counter.h:77 [inline] shmem_inode_acct_blocks+0x187/0x470 mm/shmem.c:233 shmem_alloc_and_add_folio+0x8bc/0xf60 mm/shmem.c:1920 shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2536 shmem_get_folio mm/shmem.c:2642 [inline] shmem_write_begin+0xf7/0x2b0 mm/shmem.c:3292 generic_perform_write+0x2c7/0x910 mm/filemap.c:4112 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3467 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x548/0xa90 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 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: 0033:0x7f1c61d8e9a9 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:00007f1c62b73038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1c61fb6160 RCX: 00007f1c61d8e9a9 RDX: 00000000ffffffc1 RSI: 0000200000000200 RDI: 000000000000000a RBP: 00007f1c61e10d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1c61fb6160 R15: 00007ffe8452d7f8 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup