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X-CSE-ConnectionGUID: mzXzEIcCSFyDuJnhUREt7Q== X-CSE-MsgGUID: 5jgSH1g8Qmu4G9vYbZDuwQ== X-IronPort-AV: E=McAfee;i="6800,10657,11929"; a="326053" X-IronPort-AV: E=Sophos;i="6.27,147,1787036400"; d="scan'208";a="326053" Received: from fmviesa011.fm.intel.com ([10.60.135.151]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Oct 2026 23:46:58 -0700 X-CSE-ConnectionGUID: 2UBBvTA4SomBEUvsnjbmbg== X-CSE-MsgGUID: PZRFGWHdSYqq260r7G/Rsg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,147,1787036400"; d="scan'208";a="2060061" Received: from ly-workstation.sh.intel.com (HELO ly-workstation) ([10.239.182.64]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Oct 2026 23:46:54 -0700 Date: Fri, 9 Oct 2026 14:46:51 +0800 From: kernel test robot To: Qi Zheng Cc: oe-lkp@lists.linux.dev, lkp@intel.com, Andrew Morton , Baolin Wang , Christian Brauner , David Hildenbrand , Hugh Dickins , Johannes Weiner , Michal Hocko , Muchun Song , Roman Gushchin , Shakeel Butt , Qinyun Tan , linux-mm@kvack.org, yi1.lai@intel.com Subject: [linux-next:master] [mm] b9b1861d4f: WARNING:possible_circular_locking_dependency_detected Message-ID: <202610091403.d1d8080b-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 0C1A220006 X-Rspam-User: X-Stat-Signature: 3tm5f15oq9gdsy1f1fqeh49ocwiatztq X-HE-Tag: 1791528419-920964 X-HE-Meta: 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 SVKM0m9W pWXrpZ19vKRL02CzNljoiBF2aE0KCEfamEqCUbYgGvUYQ+rdlsljztrdBk38Fo/iG9ScQ4fZmv/nOlss4S1hZcc0bubGpEyeMFQ0k6S567K4V5dVvRkzJRZJ6i7rSY6MaJeGI7TXyFx8iYrqo0PKiH58BQVzp4O5EQuPeg9UkMNGPvev1ntR1thpngATRuWMRdWcjQqnrgG23mkajpxMptQOMKgkwK9Z4Vgfml4UpWE0sWW4hEEtLTcaKNEsIT3eDrKHs+J6Bwj7Ht9i0+lnDmMKrqI/Y8owM/925a4I6dKp27OVOXtZtAxsFeSndotAmxt6UUofHsjCTSIfBeTb3TXXW8ROLnzTOrCStRsL5KXlgEln4jsDG6Ol66w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, kernel test robot noticed "WARNING:possible_circular_locking_dependency_detected" on: commit: b9b1861d4f7ae63b15228c744d504a86ab48a5a2 ("mm: shmem: make unused huge shrinker memcg aware") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master [test failed on linux-next/master f5f84daefcd92d7a630066635ecea1433ed5eac7] in testcase: boot config: i386-randconfig-053-20260902 compiler: clang-22 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 4 -m 4G (please refer to attached dmesg/kmsg for entire log/backtrace) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202610091403.d1d8080b-lkp@intel.com [ 64.638596][ T203] ====================================================== [ 64.643742][ T203] WARNING: possible circular locking dependency detected [ 64.649127][ T203] 7.3.0-rc4+ #1 Not tainted [ 64.652392][ T203] ------------------------------------------------------ [ 64.657842][ T203] systemd-udevd/203 is trying to acquire lock: [ 64.663589][ T203] f5835900 (&sb->s_type->i_lock_key){+.+.}-{3:3}, at: igrab+0x44/0xc0 [ 64.669221][ T203] [ 64.669221][ T203] but task is already holding lock: [ 64.669221][ T203] [ 64.669221][ T203] but task is already holding lock: [ 64.669221][ T203] [ 64.669221][ T203] but task is already holding lock: [ 64.674183][ T203] f5c5a61c (&l->lock){+.+.}-{3:3}, at: __list_lru_walk_one+0x55/0x180 [ 64.679737][ T203] [ 64.679737][ T203] which lock already depends on the new lock. [ 64.679737][ T203] [ 64.679737][ T203] which lock already depends on the new lock. [ 64.679737][ T203] [ 64.679737][ T203] which lock already depends on the new lock. [ 64.679737][ T203] [ 64.686427][ T203] [ 64.686427][ T203] the existing dependency chain (in reverse order) is: [ 64.686427][ T203] [ 64.686427][ T203] the existing dependency chain (in reverse order) is: [ 64.686427][ T203] [ 64.686427][ T203] the existing dependency chain (in reverse order) is: [ 64.691963][ T203] [ 64.691963][ T203] -> #2 (&l->lock){+.+.}-{3:3}: [ 64.691963][ T203] [ 64.691963][ T203] -> #2 (&l->lock){+.+.}-{3:3}: [ 64.691963][ T203] [ 64.691963][ T203] -> #2 (&l->lock){+.+.}-{3:3}: [ 64.695874][ T203] _raw_spin_lock+0x26/0x40 [ 64.699072][ T203] list_lru_add_obj+0x3c/0xc0 [ 64.702561][ T203] d_lru_add+0x40/0x80 [ 64.705640][ T203] fast_dput+0x1c7/0x200 [ 64.708794][ T203] dput+0x25/0x40 [ 64.711603][ T203] pick_link+0x1ed/0x340 [ 64.714612][ T203] step_into_slowpath+0x1af/0x200 [ 64.718143][ T203] path_lookupat+0x109/0x1c0 [ 64.721512][ T203] filename_lookup+0xc1/0x200 [ 64.725044][ T203] user_path_at+0x2f/0xc0 [ 64.728522][ T203] __ia32_sys_mount+0x134/0x1c0 [ 64.732025][ T203] ia32_sys_call+0x39/0x14c0 [ 64.735800][ T203] __do_fast_syscall_32+0x16c/0x340 [ 64.740069][ T203] do_fast_syscall_32+0x28/0x80 [ 64.743715][ T203] do_SYSENTER_32+0x12/0x40 [ 64.747337][ T203] entry_SYSENTER_32+0x98/0xfd [ 64.750971][ T203] [ 64.750971][ T203] -> #1 (&lockref->lock){+.+.}-{3:3}: [ 64.750971][ T203] [ 64.750971][ T203] -> #1 (&lockref->lock){+.+.}-{3:3}: [ 64.750971][ T203] [ 64.750971][ T203] -> #1 (&lockref->lock){+.+.}-{3:3}: [ 64.756528][ T203] _raw_spin_lock+0x26/0x40 [ 64.760072][ T203] d_instantiate+0x34/0x80 [ 64.763562][ T203] d_make_root+0x29/0x40 [ 64.766867][ T203] shmem_fill_super+0x292/0x340 [ 64.770617][ T203] get_tree_nodev+0x3e/0x80 [ 64.774112][ T203] shmem_get_tree+0x12/0x40 [ 64.777728][ T203] vfs_get_tree+0x1e/0xc0 [ 64.781170][ T203] vfs_kern_mount+0x6e/0xc0 [ 64.784747][ T203] kern_mount+0x16/0x40 [ 64.787998][ T203] shmem_init+0x26/0x100 [ 64.791525][ T203] mnt_init+0xfd/0x140 [ 64.794594][ T203] vfs_caches_init+0x26/0x40 [ 64.798341][ T203] start_kernel+0x2df/0x380 [ 64.801707][ T203] i386_start_kernel+0xc5/0x100 [ 64.805611][ T203] startup_32_smp+0x151/0x160 [ 64.809276][ T203] [ 64.809276][ T203] -> #0 (&sb->s_type->i_lock_key){+.+.}-{3:3}: [ 64.809276][ T203] [ 64.809276][ T203] -> #0 (&sb->s_type->i_lock_key){+.+.}-{3:3}: [ 64.809276][ T203] [ 64.809276][ T203] -> #0 (&sb->s_type->i_lock_key){+.+.}-{3:3}: [ 64.815036][ T203] __lock_acquire+0x1851/0x2a40 [ 64.818649][ T203] lock_acquire+0x96/0x200 [ 64.821879][ T203] _raw_spin_lock+0x26/0x40 [ 64.825139][ T203] igrab+0x44/0xc0 [ 64.828067][ T203] shmem_unused_huge_isolate+0x2e/0xc0 [ 64.832099][ T203] __list_lru_walk_one+0x98/0x180 [ 64.835960][ T203] list_lru_walk_node+0x1b/0x40 [ 64.839660][ T203] shmem_unused_huge_shrink+0x62/0x500 [ 64.843880][ T203] shmem_alloc_and_add_folio+0x1b8/0x480 [ 64.847901][ T203] shmem_get_folio_gfp+0x1af/0x880 [ 64.851755][ T203] shmem_write_begin+0x5c/0x100 [ 64.855571][ T203] generic_perform_write+0xc1/0x340 [ 64.859545][ T203] shmem_file_write_iter+0x5f/0x80 [ 64.863719][ T203] vfs_write+0x263/0x340 [ 64.867230][ T203] ksys_write+0x6a/0x100 [ 64.870798][ T203] __ia32_sys_write+0x18/0x40 [ 64.874740][ T203] ia32_sys_call+0x1365/0x14c0 [ 64.878135][ T203] __do_fast_syscall_32+0x16c/0x340 [ 64.881546][ T203] do_fast_syscall_32+0x28/0x80 [ 64.885606][ T203] do_SYSENTER_32+0x12/0x40 [ 64.889087][ T203] entry_SYSENTER_32+0x98/0xfd [ 64.892908][ T203] [ 64.892908][ T203] other info that might help us debug this: [ 64.892908][ T203] [ 64.892908][ T203] other info that might help us debug this: [ 64.892908][ T203] [ 64.892908][ T203] other info that might help us debug this: [ 64.892908][ T203] [ 64.900253][ T203] Chain exists of: [ 64.900253][ T203] &sb->s_type->i_lock_key --> &lockref->lock --> &l->lock [ 64.900253][ T203] [ 64.900253][ T203] Chain exists of: [ 64.900253][ T203] &sb->s_type->i_lock_key --> &lockref->lock --> &l->lock [ 64.900253][ T203] [ 64.900253][ T203] Chain exists of: [ 64.900253][ T203] &sb->s_type->i_lock_key --> &lockref->lock --> &l->lock [ 64.900253][ T203] [ 64.909551][ T203] Possible unsafe locking scenario: [ 64.909551][ T203] [ 64.909551][ T203] Possible unsafe locking scenario: [ 64.909551][ T203] [ 64.909551][ T203] Possible unsafe locking scenario: [ 64.909551][ T203] [ 64.915049][ T203] CPU0 CPU1 [ 64.918939][ T203] ---- ---- [ 64.922808][ T203] lock(&l->lock); [ 64.925634][ T203] lock(&lockref->lock); [ 64.930586][ T203] lock(&l->lock); [ 64.934913][ T203] lock(&sb->s_type->i_lock_key); [ 64.938686][ T203] [ 64.938686][ T203] *** DEADLOCK *** [ 64.938686][ T203] [ 64.938686][ T203] *** DEADLOCK *** [ 64.938686][ T203] [ 64.938686][ T203] *** DEADLOCK *** [ 64.938686][ T203] [ 64.944491][ T203] locks held by systemd-udevd/203: 4, last CPU#0: [ 64.949046][ T203] #0: f5c50a6c (sb_writers#6){.+.+}-{0:0}, at: vfs_write+0xb7/0x340 [ 64.954944][ T203] #1: f5655658 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: shmem_file_write_iter+0x28/0x80 [ 64.962274][ T203] #2: f5c5a61c (&l->lock){+.+.}-{3:3}, at: __list_lru_walk_one+0x55/0x180 [ 64.968148][ T203] #3: f5835810 (&info->lock){+.+.}-{3:3}, at: shmem_unused_huge_isolate+0x1f/0xc0 [ 64.974409][ T203] [ 64.974409][ T203] stack backtrace: [ 64.974409][ T203] [ 64.974409][ T203] stack backtrace: [ 64.974409][ T203] [ 64.974409][ T203] stack backtrace: [ 64.978786][ T203] CPU: 0 UID: 0 PID: 203 Comm: systemd-udevd Not tainted 7.3.0-rc4+ #1 PREEMPT 2f9698b0cc81084abb5f3c5754f76765d21e2bf0 [ 64.987668][ T203] Call Trace: [ 64.990012][ T203] __dump_stack+0x18/0x40 [ 64.993281][ T203] dump_stack_lvl+0x20/0x40 [ 64.996699][ T203] dump_stack+0xd/0x12 [ 64.999644][ T203] print_circular_bug+0x2bf/0x300 [ 65.003228][ T203] check_noncircular+0xd7/0x100 [ 65.006753][ T203] __lock_acquire+0x1851/0x2a40 [ 65.009733][ T203] ? _raw_spin_unlock_irqrestore+0x20/0x80 [ 65.013953][ T203] lock_acquire+0x96/0x200 [ 65.017236][ T203] ? igrab+0x44/0xc0 [ 65.020072][ T203] _raw_spin_lock+0x26/0x40 [ 65.023308][ T203] ? igrab+0x44/0xc0 [ 65.025972][ T203] igrab+0x44/0xc0 [ 65.028647][ T203] shmem_unused_huge_isolate+0x2e/0xc0 [ 65.032472][ T203] __list_lru_walk_one+0x98/0x180 [ 65.035619][ T203] ? shmem_unused_huge_shrink+0x500/0x500 [ 65.039875][ T203] list_lru_walk_node+0x1b/0x40 [ 65.043576][ T203] ? shmem_unused_huge_shrink+0x500/0x500 [ 65.047582][ T203] shmem_unused_huge_shrink+0x62/0x500 [ 65.051774][ T203] ? shmem_inode_acct_blocks+0x218/0x280 [ 65.055593][ T203] shmem_alloc_and_add_folio+0x1b8/0x480 [ 65.059093][ T203] shmem_get_folio_gfp+0x1af/0x880 [ 65.062996][ T203] shmem_write_begin+0x5c/0x100 [ 65.066769][ T203] generic_perform_write+0xc1/0x340 [ 65.070595][ T203] shmem_file_write_iter+0x5f/0x80 [ 65.074058][ T203] vfs_write+0x263/0x340 [ 65.077047][ T203] ? shmem_file_read_iter+0x400/0x400 [ 65.081058][ T203] ksys_write+0x6a/0x100 [ 65.084028][ T203] __ia32_sys_write+0x18/0x40 [ 65.087227][ T203] ia32_sys_call+0x1365/0x14c0 [ 65.090769][ T203] __do_fast_syscall_32+0x16c/0x340 [ 65.094701][ T203] ? do_fast_syscall_32+0x28/0x80 [ 65.098687][ T203] do_fast_syscall_32+0x28/0x80 [ 65.102284][ T203] do_SYSENTER_32+0x12/0x40 [ 65.105857][ T203] entry_SYSENTER_32+0x98/0xfd [ 65.109406][ T203] EIP: 0xa7fbbc4c [ 65.112302][ T203] Code: c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d 31 c9 31 d2 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 8d 76 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8 [ 65.127608][ T203] EAX: ffffffda EBX: 00000010 ECX: 0238cb60 EDX: 00000023 [ 65.133201][ T203] ESI: 00000023 EDI: 0238cb60 EBP: 0238a5e0 ESP: afef94f0 [ 65.138647][ T203] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b EFLAGS: 00200246 The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20261009/202610091403.d1d8080b-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki