====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ kswapd0/111 is trying to acquire lock: ffff88802aa42610 (sb_internal#4){.+.+}-{0:0}, at: nilfs_dirty_inode+0x1a4/0x270 fs/nilfs2/inode.c:1153 but task is already holding lock: ffffffff8dd3a9a0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x166/0x1970 mm/vmscan.c:6798 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire mm/page_alloc.c:3783 [inline] fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3797 might_alloc include/linux/sched/mm.h:334 [inline] prepare_alloc_pages.constprop.0+0x155/0x560 mm/page_alloc.c:4431 __alloc_pages_noprof+0x194/0x2460 mm/page_alloc.c:4649 alloc_pages_mpol_noprof+0x275/0x610 mm/mempolicy.c:2265 folio_alloc_noprof+0x1e/0xc0 mm/mempolicy.c:2343 filemap_alloc_folio_noprof+0x3ba/0x490 mm/filemap.c:1008 __filemap_get_folio+0x51e/0xa80 mm/filemap.c:1950 pagecache_get_page+0x2c/0x250 mm/folio-compat.c:87 block_write_begin+0x38/0x4a0 fs/buffer.c:2232 nilfs_write_begin+0x9f/0x1a0 fs/nilfs2/inode.c:262 page_symlink+0x356/0x450 fs/namei.c:5236 nilfs_symlink+0x23c/0x3c0 fs/nilfs2/namei.c:153 vfs_symlink fs/namei.c:4489 [inline] vfs_symlink+0x3e8/0x660 fs/namei.c:4473 do_symlinkat+0x263/0x310 fs/namei.c:4515 __do_sys_symlinkat fs/namei.c:4531 [inline] __se_sys_symlinkat fs/namei.c:4528 [inline] __ia32_sys_symlinkat+0x97/0xc0 fs/namei.c:4528 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #1 (&nilfs->ns_segctor_sem){++++}-{3:3}: down_read+0x9a/0x330 kernel/locking/rwsem.c:1526 nilfs_transaction_begin+0x326/0xa40 fs/nilfs2/segment.c:223 nilfs_create+0xb7/0x320 fs/nilfs2/namei.c:82 lookup_open.isra.0+0x10a1/0x13c0 fs/namei.c:3505 open_last_lookups fs/namei.c:3574 [inline] path_openat+0x92f/0x29f0 fs/namei.c:3804 do_filp_open+0x1dc/0x430 fs/namei.c:3834 do_sys_openat2+0x17a/0x1e0 fs/open.c:1405 do_sys_open fs/open.c:1420 [inline] __do_compat_sys_openat fs/open.c:1480 [inline] __se_compat_sys_openat fs/open.c:1478 [inline] __ia32_compat_sys_openat+0x16e/0x210 fs/open.c:1478 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #0 (sb_internal#4){.+.+}-{0:0}: 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 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1655 [inline] sb_start_intwrite include/linux/fs.h:1838 [inline] nilfs_transaction_begin+0x21b/0xa40 fs/nilfs2/segment.c:220 nilfs_dirty_inode+0x1a4/0x270 fs/nilfs2/inode.c:1153 __mark_inode_dirty+0x1f0/0xe70 fs/fs-writeback.c:2486 mark_inode_dirty_sync include/linux/fs.h:2409 [inline] iput.part.0+0x5b/0x7f0 fs/inode.c:1764 iput+0x5c/0x80 fs/inode.c:1757 dentry_unlink_inode+0x295/0x480 fs/dcache.c:400 __dentry_kill+0x1d0/0x600 fs/dcache.c:603 shrink_kill fs/dcache.c:1048 [inline] shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156 super_cache_scan+0x32a/0x550 fs/super.c:221 do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa87/0x1310 mm/shrinker.c:626 shrink_one+0x493/0x7c0 mm/vmscan.c:4790 shrink_many mm/vmscan.c:4851 [inline] lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4951 shrink_node mm/vmscan.c:5910 [inline] kswapd_shrink_node mm/vmscan.c:6720 [inline] balance_pgdat+0x1105/0x1970 mm/vmscan.c:6911 kswapd+0x5ea/0xbf0 mm/vmscan.c:7180 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 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#4 --> &nilfs->ns_segctor_sem --> fs_reclaim Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(&nilfs->ns_segctor_sem); lock(fs_reclaim); rlock(sb_internal#4); *** DEADLOCK *** 2 locks held by kswapd0/111: #0: ffffffff8dd3a9a0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x166/0x1970 mm/vmscan.c:6798 #1: ffff88802aa420e0 (&type->s_umount_key#61){++++}-{3:3}, at: super_trylock_shared fs/super.c:562 [inline] #1: ffff88802aa420e0 (&type->s_umount_key#61){++++}-{3:3}, at: super_cache_scan+0x96/0x550 fs/super.c:196 stack backtrace: CPU: 2 PID: 111 Comm: kswapd0 Not tainted 6.10.0-rc1-syzkaller #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 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1655 [inline] sb_start_intwrite include/linux/fs.h:1838 [inline] nilfs_transaction_begin+0x21b/0xa40 fs/nilfs2/segment.c:220 nilfs_dirty_inode+0x1a4/0x270 fs/nilfs2/inode.c:1153 __mark_inode_dirty+0x1f0/0xe70 fs/fs-writeback.c:2486 mark_inode_dirty_sync include/linux/fs.h:2409 [inline] iput.part.0+0x5b/0x7f0 fs/inode.c:1764 iput+0x5c/0x80 fs/inode.c:1757 dentry_unlink_inode+0x295/0x480 fs/dcache.c:400 __dentry_kill+0x1d0/0x600 fs/dcache.c:603 shrink_kill fs/dcache.c:1048 [inline] shrink_dentry_list+0x140/0x5d0 fs/dcache.c:1075 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1156 super_cache_scan+0x32a/0x550 fs/super.c:221 do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0xa87/0x1310 mm/shrinker.c:626 shrink_one+0x493/0x7c0 mm/vmscan.c:4790 shrink_many mm/vmscan.c:4851 [inline] lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4951 shrink_node mm/vmscan.c:5910 [inline] kswapd_shrink_node mm/vmscan.c:6720 [inline] balance_pgdat+0x1105/0x1970 mm/vmscan.c:6911 kswapd+0x5ea/0xbf0 mm/vmscan.c:7180 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244