====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc1-next-20240603-syzkaller #0 Tainted: G W ------------------------------------------------------ kswapd0/89 is trying to acquire lock: ffff88802fbc8610 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1671 [inline] ffff88802fbc8610 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1854 [inline] ffff88802fbc8610 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x2f4/0xf50 fs/ext4/inode.c:212 but task is already holding lock: ffffffff8e42c540 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6852 [inline] ffffffff8e42c540 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xbe8/0x3710 mm/vmscan.c:7234 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (fs_reclaim){+.+.}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5817 __fs_reclaim_acquire mm/page_alloc.c:3838 [inline] fs_reclaim_acquire+0x88/0x140 mm/page_alloc.c:3852 might_alloc include/linux/sched/mm.h:334 [inline] slab_pre_alloc_hook mm/slub.c:3891 [inline] slab_alloc_node mm/slub.c:3981 [inline] __do_kmalloc_node mm/slub.c:4121 [inline] __kmalloc_node_noprof+0xb0/0x440 mm/slub.c:4129 kmalloc_node_noprof include/linux/slab.h:681 [inline] kvmalloc_node_noprof+0x72/0x190 mm/util.c:634 ext4_xattr_inode_cache_find fs/ext4/xattr.c:1535 [inline] ext4_xattr_inode_lookup_create+0x488/0x1ee0 fs/ext4/xattr.c:1581 ext4_xattr_block_set+0x274/0x3980 fs/ext4/xattr.c:1910 ext4_xattr_move_to_block fs/ext4/xattr.c:2663 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2738 [inline] ext4_expand_extra_isize_ea+0x12d7/0x1cf0 fs/ext4/xattr.c:2830 __ext4_expand_extra_isize+0x2fb/0x3e0 fs/ext4/inode.c:5782 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5825 [inline] __ext4_mark_inode_dirty+0x524/0x880 fs/ext4/inode.c:5903 ext4_setattr+0x1552/0x1bc0 fs/ext4/inode.c:5413 notify_change+0xb9d/0xe70 fs/attr.c:497 do_truncate+0x220/0x310 fs/open.c:65 handle_truncate fs/namei.c:3312 [inline] do_open fs/namei.c:3658 [inline] path_openat+0x2a3d/0x3280 fs/namei.c:3811 do_filp_open+0x235/0x490 fs/namei.c:3838 do_sys_openat2+0x13e/0x1d0 fs/open.c:1409 do_sys_open fs/open.c:1424 [inline] __do_sys_creat fs/open.c:1500 [inline] __se_sys_creat fs/open.c:1494 [inline] __x64_sys_creat+0x123/0x170 fs/open.c:1494 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&ei->i_data_sem){++++}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5817 down_write+0x3a/0x50 kernel/locking/rwsem.c:1579 ext4_truncate+0x991/0x11a0 fs/ext4/inode.c:4134 ext4_evict_inode+0x90f/0xf50 fs/ext4/inode.c:258 evict+0x2a8/0x630 fs/inode.c:667 d_delete_notify include/linux/fsnotify.h:326 [inline] vfs_rmdir+0x3d7/0x510 fs/namei.c:4231 do_rmdir+0x3b5/0x580 fs/namei.c:4277 __do_sys_unlinkat fs/namei.c:4453 [inline] __se_sys_unlinkat fs/namei.c:4447 [inline] __x64_sys_unlinkat+0xe0/0xf0 fs/namei.c:4447 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (sb_internal){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3159 [inline] check_prevs_add kernel/locking/lockdep.c:3278 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3902 __lock_acquire+0x1359/0x2000 kernel/locking/lockdep.c:5194 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5817 percpu_down_read+0x44/0x1b0 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1671 [inline] sb_start_intwrite include/linux/fs.h:1854 [inline] ext4_evict_inode+0x2f4/0xf50 fs/ext4/inode.c:212 evict+0x2a8/0x630 fs/inode.c:667 __dentry_kill+0x20d/0x630 fs/dcache.c:603 shrink_kill+0xa9/0x2c0 fs/dcache.c:1048 shrink_dentry_list+0x2c0/0x5b0 fs/dcache.c:1075 prune_dcache_sb+0x10f/0x180 fs/dcache.c:1156 super_cache_scan+0x34f/0x4b0 fs/super.c:221 do_shrink_slab+0x701/0x1160 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0x878/0x14c0 mm/shrinker.c:626 shrink_one+0x450/0x880 mm/vmscan.c:4806 shrink_many mm/vmscan.c:4867 [inline] lru_gen_shrink_node mm/vmscan.c:4967 [inline] shrink_node+0x3975/0x4160 mm/vmscan.c:5947 kswapd_shrink_node mm/vmscan.c:6774 [inline] balance_pgdat mm/vmscan.c:6965 [inline] kswapd+0x1882/0x3710 mm/vmscan.c:7234 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 other info that might help us debug this: Chain exists of: sb_internal --> &ei->i_data_sem --> fs_reclaim Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(&ei->i_data_sem); lock(fs_reclaim); rlock(sb_internal); *** DEADLOCK *** 2 locks held by kswapd0/89: #0: ffffffff8e42c540 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6852 [inline] #0: ffffffff8e42c540 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xbe8/0x3710 mm/vmscan.c:7234 #1: ffff88802fbc80e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_trylock_shared fs/super.c:562 [inline] #1: ffff88802fbc80e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_cache_scan+0x94/0x4b0 fs/super.c:196 stack backtrace: CPU: 1 PID: 89 Comm: kswapd0 Tainted: G W 6.10.0-rc1-next-20240603-syzkaller #0 Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:91 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:117 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2075 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2204 check_prev_add kernel/locking/lockdep.c:3159 [inline] check_prevs_add kernel/locking/lockdep.c:3278 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3902 __lock_acquire+0x1359/0x2000 kernel/locking/lockdep.c:5194 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5817 percpu_down_read+0x44/0x1b0 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1671 [inline] sb_start_intwrite include/linux/fs.h:1854 [inline] ext4_evict_inode+0x2f4/0xf50 fs/ext4/inode.c:212 evict+0x2a8/0x630 fs/inode.c:667 __dentry_kill+0x20d/0x630 fs/dcache.c:603 shrink_kill+0xa9/0x2c0 fs/dcache.c:1048 shrink_dentry_list+0x2c0/0x5b0 fs/dcache.c:1075 prune_dcache_sb+0x10f/0x180 fs/dcache.c:1156 super_cache_scan+0x34f/0x4b0 fs/super.c:221 do_shrink_slab+0x701/0x1160 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0x878/0x14c0 mm/shrinker.c:626 shrink_one+0x450/0x880 mm/vmscan.c:4806 shrink_many mm/vmscan.c:4867 [inline] lru_gen_shrink_node mm/vmscan.c:4967 [inline] shrink_node+0x3975/0x4160 mm/vmscan.c:5947 kswapd_shrink_node mm/vmscan.c:6774 [inline] balance_pgdat mm/vmscan.c:6965 [inline] kswapd+0x1882/0x3710 mm/vmscan.c:7234 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244