Hello, syzbot found the following issue on: HEAD commit: fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11525d81180000 kernel config: https://syzkaller.appspot.com/x/.config?x=fe78468a74fdc3b7 dashboard link: https://syzkaller.appspot.com/bug?extid=7766d4a620956dfe7070 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0f7abe4afac7/disk-fe46a7dd.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/82598d09246c/vmlinux-fe46a7dd.xz kernel image: https://storage.googleapis.com/syzbot-assets/efa23788c875/bzImage-fe46a7dd.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7766d4a620956dfe7070@xxxxxxxxxxxxxxxxxxxxxxxxx ====================================================== WARNING: possible circular locking dependency detected 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted ------------------------------------------------------ kswapd0/89 is trying to acquire lock: ffff88814af18118 (&xfs_dir_ilock_class){++++}-{3:3}, at: xfs_reclaim_inode fs/xfs/xfs_icache.c:945 [inline] ffff88814af18118 (&xfs_dir_ilock_class){++++}-{3:3}, at: xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1631 [inline] ffff88814af18118 (&xfs_dir_ilock_class){++++}-{3:3}, at: xfs_icwalk_ag+0x1216/0x1aa0 fs/xfs/xfs_icache.c:1713 but task is already holding lock: ffffffff8e21f720 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6774 [inline] ffffffff8e21f720 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xb3f/0x36e0 mm/vmscan.c:7146 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (fs_reclaim){+.+.}-{0:0}: lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 __fs_reclaim_acquire mm/page_alloc.c:3692 [inline] fs_reclaim_acquire+0x88/0x130 mm/page_alloc.c:3706 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slub.c:3746 [inline] slab_alloc_node mm/slub.c:3827 [inline] kmem_cache_alloc+0x48/0x340 mm/slub.c:3852 radix_tree_node_alloc+0x8b/0x3c0 lib/radix-tree.c:276 radix_tree_extend+0x148/0x5c0 lib/radix-tree.c:425 __radix_tree_create lib/radix-tree.c:613 [inline] radix_tree_insert+0x15c/0x680 lib/radix-tree.c:712 xfs_qm_dqget_cache_insert fs/xfs/xfs_dquot.c:826 [inline] xfs_qm_dqget+0x2d4/0x640 fs/xfs/xfs_dquot.c:901 xfs_qm_vop_dqalloc+0x5a3/0xef0 fs/xfs/xfs_qm.c:1730 xfs_setattr_nonsize+0x410/0xea0 fs/xfs/xfs_iops.c:707 xfs_vn_setattr+0x2d1/0x320 fs/xfs/xfs_iops.c:1027 notify_change+0xb9f/0xe70 fs/attr.c:497 chown_common+0x501/0x850 fs/open.c:790 vfs_fchown fs/open.c:858 [inline] ksys_fchown+0xea/0x160 fs/open.c:869 __do_sys_fchown fs/open.c:877 [inline] __se_sys_fchown fs/open.c:875 [inline] __x64_sys_fchown+0x7a/0x90 fs/open.c:875 do_syscall_64+0xfd/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 -> #1 (&qinf->qi_tree_lock){+.+.}-{3:3}: lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 xfs_qm_dqget_cache_lookup+0x30/0x870 fs/xfs/xfs_dquot.c:784 xfs_qm_dqget_inode+0x353/0xaa0 fs/xfs/xfs_dquot.c:986 xfs_qm_dqattach_one+0x185/0x5e0 fs/xfs/xfs_qm.c:278 xfs_qm_dqattach_locked+0x3d1/0x4e0 fs/xfs/xfs_qm.c:329 xfs_qm_vop_dqalloc+0x3fd/0xef0 fs/xfs/xfs_qm.c:1710 xfs_create+0x568/0x1300 fs/xfs/xfs_inode.c:1041 xfs_generic_create+0x495/0xd70 fs/xfs/xfs_iops.c:199 lookup_open fs/namei.c:3497 [inline] open_last_lookups fs/namei.c:3566 [inline] path_openat+0x1427/0x3240 fs/namei.c:3796 do_filp_open+0x235/0x490 fs/namei.c:3826 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_open fs/open.c:1429 [inline] __se_sys_open fs/open.c:1425 [inline] __x64_sys_open+0x225/0x270 fs/open.c:1425 do_syscall_64+0xfd/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 -> #0 (&xfs_dir_ilock_class){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695 xfs_reclaim_inode fs/xfs/xfs_icache.c:945 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1631 [inline] xfs_icwalk_ag+0x1216/0x1aa0 fs/xfs/xfs_icache.c:1713 xfs_icwalk fs/xfs/xfs_icache.c:1762 [inline] xfs_reclaim_inodes_nr+0x257/0x360 fs/xfs/xfs_icache.c:1011 super_cache_scan+0x411/0x4b0 fs/super.c:227 do_shrink_slab+0x6d2/0x1140 mm/shrinker.c:435 shrink_slab+0x1092/0x14d0 mm/shrinker.c:662 shrink_one+0x423/0x7f0 mm/vmscan.c:4767 shrink_many mm/vmscan.c:4828 [inline] lru_gen_shrink_node mm/vmscan.c:4929 [inline] shrink_node+0x37b8/0x3e70 mm/vmscan.c:5888 kswapd_shrink_node mm/vmscan.c:6696 [inline] balance_pgdat mm/vmscan.c:6886 [inline] kswapd+0x17d1/0x36e0 mm/vmscan.c:7146 kthread+0x2f2/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 other info that might help us debug this: Chain exists of: &xfs_dir_ilock_class --> &qinf->qi_tree_lock --> fs_reclaim Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(&qinf->qi_tree_lock); lock(fs_reclaim); lock(&xfs_dir_ilock_class); *** DEADLOCK *** 2 locks held by kswapd0/89: #0: ffffffff8e21f720 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6774 [inline] #0: ffffffff8e21f720 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xb3f/0x36e0 mm/vmscan.c:7146 #1: ffff88807c6c60e0 (&type->s_umount_key#55){.+.+}-{3:3}, at: super_trylock_shared fs/super.c:561 [inline] #1: ffff88807c6c60e0 (&type->s_umount_key#55){.+.+}-{3:3}, at: super_cache_scan+0x94/0x4b0 fs/super.c:196 stack backtrace: CPU: 1 PID: 89 Comm: kswapd0 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695 xfs_reclaim_inode fs/xfs/xfs_icache.c:945 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1631 [inline] xfs_icwalk_ag+0x1216/0x1aa0 fs/xfs/xfs_icache.c:1713 xfs_icwalk fs/xfs/xfs_icache.c:1762 [inline] xfs_reclaim_inodes_nr+0x257/0x360 fs/xfs/xfs_icache.c:1011 super_cache_scan+0x411/0x4b0 fs/super.c:227 do_shrink_slab+0x6d2/0x1140 mm/shrinker.c:435 shrink_slab+0x1092/0x14d0 mm/shrinker.c:662 shrink_one+0x423/0x7f0 mm/vmscan.c:4767 shrink_many mm/vmscan.c:4828 [inline] lru_gen_shrink_node mm/vmscan.c:4929 [inline] shrink_node+0x37b8/0x3e70 mm/vmscan.c:5888 kswapd_shrink_node mm/vmscan.c:6696 [inline] balance_pgdat mm/vmscan.c:6886 [inline] kswapd+0x17d1/0x36e0 mm/vmscan.c:7146 kthread+0x2f2/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 </TASK> --- 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@xxxxxxxxxxxxxxxx. 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
