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Tue, 07 Apr 2026 10:53:24 -0700 (PDT) Date: Tue, 07 Apr 2026 10:53:24 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69d54494.050a0220.3030df.0002.GAE@google.com> Subject: [syzbot] [mm?] [cgroups?] WARNING: bad unlock balance in lruvec_stat_mod_folio From: syzbot To: akpm@linux-foundation.org, cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@kernel.org, muchun.song@linux.dev, roman.gushchin@linux.dev, shakeel.butt@linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 3A1C0180004 X-Stat-Signature: cq6onoeopfqsnicthgoemmaw7umrjcyc X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1775584405-531843 X-HE-Meta: U2FsdGVkX1+qEDLWl/BVtGN46NlP4QAcsJayjFlcbe1saJcDz7jctYimL59LIU0OSW84ozKsNxXgsdLBIxmLE/cMYMNY2gktycatNxO66iuTwn8c05S2ESGRNp+3bDzY9it+fyz5do+CMFzgFA8L5OOKH7kYv5W8kjHvZ5at6njOq7NKeUYwwGV8PRcH+tLNSXHLOs2r3UW+438daxbdiUrtMF5Cr69MpnnP9RHfPtpiLbZudT6StvRbMY+jyhNK9vYLttfaC458KlPILZ79Maya9QqXomx62ViiBuqkTp03d3M3GeYrEXpBh6VB0SCjbOBLHKdEvwD5Ozd/JRuU3iG0JEGvS0HvlB4QstIty9XM3Qsp98ygYAYFRTS1FWnj5X6ZdV2/Vi5aewPy0UZMUIP/NSoMBFohcC4/U/0CP1ua/IaazJa5/530kS0Kj2VmQezldGgu9yarsa7cpI4T5hv45OJaXxHfA0tH283Gaq5VHHbauHmYpn/UVOiX+wqxjJ3lYol4+TPCVZbuGOPWJzL/a1iSLjesvknva5MAqxulIKdNQs575+CzOn3OV54tWUrqw1aNkLKUYh4crWrVnVoWMIxRNG8pH9lRYzCyHSSqQVFaOI5PR/1ECNaPWJpaU3lfzO0gEBOALU+M3Z3KR/23kwmEETz+MIaTzQ8pRmOXgApC5Lnqdje6Ytcoac8oa1dTx1Vp4iVzS6doQQMf7BZLE6ANDr+O05tQgpJ6U/I+K1jgXn+/+FDe7zZv97nYkJi7ZpiQYXQgYhqfGbAm8pXMj31uNbj1d3iFI1g//TByvswIeNfMB9km7upOGBGz33OKxsLKmHlSv+lK459IsOrbz809Pss8ZYEI23Hsd8JJHKXBIDHAmcXgBtOvWL2rt+hUJjwltKpUvikEJsjzQ5jsplpZQC0YscGFulCo3ahh3dWOFyrVs7GAWkv0pT8zjjMogNApkWtQf5vgw5Z upEjHNKo 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 XIeXwkXn ZWuSQ/wS2yVpY2t9H1vNOuKA8DkqEzDo5mxtjD4S1Q5rLvm2qMtg/MFalk83spceUFN0fFbbpkWqE+dNgDS4PMYFB6KK8SqqBrDZe/6lktQq/wLNFrHRhE6Vf+kQuuiYOfJdN2L1oflnj66Kjjj8lmpMcYR8y00l5Qu1090N2Eu6oyfoxujCivMqRsmLPWOk6ZOrSXeey8iV+s9qen5bOhB0Wcm6NMrb6CrYn2RK9U1lXE4spp8x6mW11bcaZs5pcLpQjvqyKA31bwyQoh2G4d4RI8pFc57j6msSyviLlqXqHzm5+pstS19k1vvwvESoMq95ph3Rxtet8PLQoVxGkLBlRJSQbA8x4Sg1FmrlV8r4sWmPlCefnSFlYCZhWkXZr0rn4urVXPpoQPu8pWuSECxn2ckC9SrxoQ5p2dWEvuPkApHAuzZI4iHlWXnMgtoyY6J0CxA9aLUbDozmIkdYmeByBKvAO50g 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: cc13002a9f98 Add linux-next specific files for 20260402 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10d8946a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4e6c8be618ab359 dashboard link: https://syzkaller.appspot.com/bug?extid=1a3353a77896e73a8f53 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e804756158fe/disk-cc13002a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/be49b7dca580/vmlinux-cc13002a.xz kernel image: https://storage.googleapis.com/syzbot-assets/5cb3fb091ba3/bzImage-cc13002a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1a3353a77896e73a8f53@syzkaller.appspotmail.com cgroup: Unknown subsys name 'cpuset' cgroup: Unknown subsys name 'rlimit' ===================================== WARNING: bad unlock balance detected! syzkaller #0 Not tainted ------------------------------------- syz-executor/5830 is trying to release lock (rcu_read_lock) at: [] rcu_lock_acquire include/linux/rcupdate.h:312 [inline] [] rcu_read_lock include/linux/rcupdate.h:850 [inline] [] lruvec_stat_mod_folio+0x6e/0x3e0 mm/memcontrol.c:974 but there are no more locks to release! other info that might help us debug this: 3 locks held by syz-executor/5830: #0: ffff88802cb7f588 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: process_measurement+0x7f1/0x1c80 security/integrity/ima/ima_main.c:319 #1: ffff888077946ff0 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1094 [inline] #1: ffff888077946ff0 (mapping.invalidate_lock#2){++++}-{4:4}, at: do_page_cache_ra mm/readahead.c:333 [inline] #1: ffff888077946ff0 (mapping.invalidate_lock#2){++++}-{4:4}, at: page_cache_ra_order+0xad4/0xe80 mm/readahead.c:538 #2: ffff888077946f50 (&xa->xa_lock#10){..-.}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:372 [inline] #2: ffff888077946f50 (&xa->xa_lock#10){..-.}-{3:3}, at: __filemap_add_folio+0x9fe/0x1330 mm/filemap.c:876 stack backtrace: CPU: 1 UID: 0 PID: 5830 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_unlock_imbalance_bug+0xdc/0xf0 kernel/locking/lockdep.c:5298 __lock_release kernel/locking/lockdep.c:5537 [inline] lock_release+0x248/0x3c0 kernel/locking/lockdep.c:5889 rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] lruvec_stat_mod_folio+0x28b/0x3e0 mm/memcontrol.c:985 __filemap_add_folio+0xceb/0x1330 mm/filemap.c:924 filemap_add_folio+0x264/0x530 mm/filemap.c:967 page_cache_ra_unbounded+0x494/0xa10 mm/readahead.c:282 do_page_cache_ra mm/readahead.c:334 [inline] page_cache_ra_order+0xae4/0xe80 mm/readahead.c:538 filemap_readahead mm/filemap.c:2664 [inline] filemap_get_pages+0x897/0x1ef0 mm/filemap.c:2710 filemap_read+0x447/0x1230 mm/filemap.c:2806 __kernel_read+0x504/0x9b0 fs/read_write.c:532 integrity_kernel_read+0x89/0xd0 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:222 [inline] ima_calc_file_hash+0x446/0x860 security/integrity/ima/ima_crypto.c:280 ima_collect_measurement+0x51d/0x9c0 security/integrity/ima/ima_api.c:300 process_measurement+0x12cd/0x1c80 security/integrity/ima/ima_main.c:425 ima_file_check+0xe1/0x130 security/integrity/ima/ima_main.c:685 security_file_post_open+0xb3/0x260 security/security.c:2653 do_open fs/namei.c:4701 [inline] path_openat+0x2e4d/0x3860 fs/namei.c:4858 do_file_open+0x23e/0x4a0 fs/namei.c:4887 file_open_name+0x162/0x1c0 fs/open.c:1322 __do_sys_swapon mm/swapfile.c:3471 [inline] __se_sys_swapon+0x84a/0x2090 mm/swapfile.c:3436 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efed519c7d7 Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a7 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc370182b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a7 RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00007efed519c7d7 RDX: 0000000000000000 RSI: 0000000000008000 RDI: 00007efed5232e5b RBP: 00007efed5232e5b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 00007efed53e63e0 R13: 00007efed524dd26 R14: 0000000000200000 R15: 00007efed53e63a0 ------------[ cut here ]------------ rrln < 0 || rrln > RCU_NEST_PMAX WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x79/0xe0 kernel/rcu/tree_plugin.h:443, CPU#1: syz-executor/5830 Modules linked in: CPU: 1 UID: 0 PID: 5830 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:__rcu_read_unlock+0x79/0xe0 kernel/rcu/tree_plugin.h:443 Code: 75 66 41 83 3e 00 75 27 43 0f b6 04 3c 84 c0 75 41 8b 03 3d 00 00 00 40 73 0f 5b 41 5c 41 5d 41 5e 41 5f e9 59 12 11 0a cc 90 <0f> 0b 90 eb eb e8 6d 00 00 00 eb d2 89 d9 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc90003b863f0 EFLAGS: 00010086 RAX: 00000000ffffffff RBX: ffff88803567a344 RCX: 0000000080000001 RDX: 0000000000000000 RSI: ffffffff8e37db44 RDI: ffff888035679e80 RBP: ffffc90003b86588 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1d06db0 R12: 1ffff11006acf468 R13: dffffc0000000000 R14: 00000003fffffffc R15: dffffc0000000000 FS: 00005555886db540(0000) GS:ffff888125304000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f36450057b8 CR3: 00000000762a4000 CR4: 00000000003526f0 Call Trace: __filemap_add_folio+0xceb/0x1330 mm/filemap.c:924 filemap_add_folio+0x264/0x530 mm/filemap.c:967 page_cache_ra_unbounded+0x494/0xa10 mm/readahead.c:282 do_page_cache_ra mm/readahead.c:334 [inline] page_cache_ra_order+0xae4/0xe80 mm/readahead.c:538 filemap_readahead mm/filemap.c:2664 [inline] filemap_get_pages+0x897/0x1ef0 mm/filemap.c:2710 filemap_read+0x447/0x1230 mm/filemap.c:2806 __kernel_read+0x504/0x9b0 fs/read_write.c:532 integrity_kernel_read+0x89/0xd0 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:222 [inline] ima_calc_file_hash+0x446/0x860 security/integrity/ima/ima_crypto.c:280 ima_collect_measurement+0x51d/0x9c0 security/integrity/ima/ima_api.c:300 process_measurement+0x12cd/0x1c80 security/integrity/ima/ima_main.c:425 ima_file_check+0xe1/0x130 security/integrity/ima/ima_main.c:685 security_file_post_open+0xb3/0x260 security/security.c:2653 do_open fs/namei.c:4701 [inline] path_openat+0x2e4d/0x3860 fs/namei.c:4858 do_file_open+0x23e/0x4a0 fs/namei.c:4887 file_open_name+0x162/0x1c0 fs/open.c:1322 __do_sys_swapon mm/swapfile.c:3471 [inline] __se_sys_swapon+0x84a/0x2090 mm/swapfile.c:3436 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efed519c7d7 Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a7 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc370182b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a7 RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00007efed519c7d7 RDX: 0000000000000000 RSI: 0000000000008000 RDI: 00007efed5232e5b RBP: 00007efed5232e5b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 00007efed53e63e0 R13: 00007efed524dd26 R14: 0000000000200000 R15: 00007efed53e63a0 --- 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