====================================================== WARNING: possible circular locking dependency detected 6.9.0-rc2-syzkaller-00413-gf2f80ac80987 #0 Not tainted ------------------------------------------------------ kswapd0/110 is trying to acquire lock: ffff888053641098 (&xfs_dir_ilock_class){++++}-{3:3}, at: xfs_ilock+0x2ef/0x420 fs/xfs/xfs_inode.c:206 but task is already holding lock: ffffffff8d939440 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x166/0x1a10 mm/vmscan.c:6782 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire mm/page_alloc.c:3698 [inline] fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3712 might_alloc include/linux/sched/mm.h:312 [inline] prepare_alloc_pages.constprop.0+0x155/0x560 mm/page_alloc.c:4346 __alloc_pages+0x194/0x2460 mm/page_alloc.c:4564 alloc_pages_mpol+0x275/0x610 mm/mempolicy.c:2264 stack_depot_save_flags+0x566/0x900 lib/stackdepot.c:635 kasan_save_stack+0x42/0x60 mm/kasan/common.c:48 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3966 [inline] __kmalloc+0x1f9/0x440 mm/slub.c:3979 kmalloc include/linux/slab.h:632 [inline] kzalloc include/linux/slab.h:749 [inline] xfs_dabuf_map.constprop.0+0x7b2/0xc60 fs/xfs/libxfs/xfs_da_btree.c:2547 xfs_da_reada_buf+0xca/0x1e0 fs/xfs/libxfs/xfs_da_btree.c:2711 xfs_dir_open+0xbf/0xd0 fs/xfs/xfs_file.c:1257 do_dentry_open+0x8da/0x18c0 fs/open.c:955 do_open fs/namei.c:3642 [inline] path_openat+0x1dfb/0x2990 fs/namei.c:3799 do_filp_open+0x1dc/0x430 fs/namei.c:3826 do_sys_openat2+0x17a/0x1e0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_compat_sys_openat fs/open.c:1481 [inline] __se_compat_sys_openat fs/open.c:1479 [inline] __ia32_compat_sys_openat+0x16e/0x210 fs/open.c:1479 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7a/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7f/0x89 -> #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 kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695 xfs_ilock+0x2ef/0x420 fs/xfs/xfs_inode.c:206 xfs_reclaim_inode fs/xfs/xfs_icache.c:945 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1631 [inline] xfs_icwalk_ag+0xca6/0x1780 fs/xfs/xfs_icache.c:1713 xfs_icwalk+0x57/0x100 fs/xfs/xfs_icache.c:1762 xfs_reclaim_inodes_nr+0x182/0x250 fs/xfs/xfs_icache.c:1011 super_cache_scan+0x409/0x550 fs/super.c:227 do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435 shrink_slab+0x18a/0x1310 mm/shrinker.c:662 shrink_one+0x493/0x7c0 mm/vmscan.c:4774 shrink_many mm/vmscan.c:4835 [inline] lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4935 shrink_node mm/vmscan.c:5894 [inline] kswapd_shrink_node mm/vmscan.c:6704 [inline] balance_pgdat+0x10d1/0x1a10 mm/vmscan.c:6895 kswapd+0x5ea/0xbf0 mm/vmscan.c:7164 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 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: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(&xfs_dir_ilock_class); lock(fs_reclaim); lock(&xfs_dir_ilock_class); *** DEADLOCK *** 2 locks held by kswapd0/110: #0: ffffffff8d939440 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x166/0x1a10 mm/vmscan.c:6782 #1: ffff8880699a80e0 (&type->s_umount_key#68){++++}-{3:3}, at: super_trylock_shared fs/super.c:561 [inline] #1: ffff8880699a80e0 (&type->s_umount_key#68){++++}-{3:3}, at: super_cache_scan+0x96/0x550 fs/super.c:196 stack backtrace: CPU: 3 PID: 110 Comm: kswapd0 Not tainted 6.9.0-rc2-syzkaller-00413-gf2f80ac80987 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_noncircular+0x31a/0x400 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 kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695 xfs_ilock+0x2ef/0x420 fs/xfs/xfs_inode.c:206 xfs_reclaim_inode fs/xfs/xfs_icache.c:945 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1631 [inline] xfs_icwalk_ag+0xca6/0x1780 fs/xfs/xfs_icache.c:1713 xfs_icwalk+0x57/0x100 fs/xfs/xfs_icache.c:1762 xfs_reclaim_inodes_nr+0x182/0x250 fs/xfs/xfs_icache.c:1011 super_cache_scan+0x409/0x550 fs/super.c:227 do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435 shrink_slab+0x18a/0x1310 mm/shrinker.c:662 shrink_one+0x493/0x7c0 mm/vmscan.c:4774 shrink_many mm/vmscan.c:4835 [inline] lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4935 shrink_node mm/vmscan.c:5894 [inline] kswapd_shrink_node mm/vmscan.c:6704 [inline] balance_pgdat+0x10d1/0x1a10 mm/vmscan.c:6895 kswapd+0x5ea/0xbf0 mm/vmscan.c:7164 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243