====================================================== WARNING: possible circular locking dependency detected 5.18.0-rc2-syzkaller-00351-ga2c29ccd9477 #0 Not tainted ------------------------------------------------------ khugepaged/49 is trying to acquire lock: ffff88801ca7a650 (sb_internal){.+.+}-{0:0}, at: evict+0x2ed/0x6b0 fs/inode.c:664 but task is already holding lock: ffffffff8beac660 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4621 [inline] ffffffff8beac660 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4646 [inline] ffffffff8beac660 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0xa1e/0x20e0 mm/page_alloc.c:5046 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire mm/page_alloc.c:4572 [inline] fs_reclaim_acquire+0x115/0x160 mm/page_alloc.c:4586 might_alloc include/linux/sched/mm.h:254 [inline] slab_pre_alloc_hook mm/slab.h:722 [inline] slab_alloc_node mm/slab.c:3214 [inline] kmem_cache_alloc_node_trace+0x48/0x5b0 mm/slab.c:3625 kmalloc_node include/linux/slab.h:599 [inline] kzalloc_node include/linux/slab.h:725 [inline] mempool_create_node mm/mempool.c:266 [inline] mempool_create+0x4e/0xc0 mm/mempool.c:255 mempool_create_page_pool include/linux/mempool.h:107 [inline] fscrypt_initialize+0x86/0xa0 fs/crypto/crypto.c:330 fscrypt_setup_encryption_info+0xef/0xf00 fs/crypto/keysetup.c:545 fscrypt_get_encryption_info+0x34a/0x3f0 fs/crypto/keysetup.c:654 fscrypt_setup_filename+0x238/0xec0 fs/crypto/fname.c:426 __fscrypt_prepare_lookup+0x28/0xf0 fs/crypto/hooks.c:102 fscrypt_prepare_lookup include/linux/fscrypt.h:898 [inline] ext4_fname_prepare_lookup+0x2b1/0x330 fs/ext4/ext4.h:2770 ext4_lookup_entry fs/ext4/namei.c:1694 [inline] ext4_lookup fs/ext4/namei.c:1769 [inline] ext4_lookup+0x12d/0x730 fs/ext4/namei.c:1760 lookup_open.isra.0+0x9aa/0x1690 fs/namei.c:3308 open_last_lookups fs/namei.c:3400 [inline] path_openat+0x9a2/0x2910 fs/namei.c:3606 do_filp_open+0x1aa/0x400 fs/namei.c:3636 do_sys_openat2+0x16d/0x4c0 fs/open.c:1213 do_sys_open fs/open.c:1229 [inline] __do_sys_openat fs/open.c:1245 [inline] __se_sys_openat fs/open.c:1240 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1240 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #2 (fscrypt_init_mutex){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:600 [inline] __mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:733 fscrypt_initialize+0x3c/0xa0 fs/crypto/crypto.c:324 fscrypt_setup_encryption_info+0xef/0xf00 fs/crypto/keysetup.c:545 fscrypt_get_encryption_info+0x34a/0x3f0 fs/crypto/keysetup.c:654 fscrypt_setup_filename+0x238/0xec0 fs/crypto/fname.c:426 ext4_fname_setup_filename+0x8d/0x240 fs/ext4/ext4.h:2751 ext4_find_entry+0x8c/0x170 fs/ext4/namei.c:1674 __ext4_unlink+0x92/0x920 fs/ext4/namei.c:3155 ext4_unlink+0x346/0x9e0 fs/ext4/namei.c:3231 vfs_unlink+0x351/0x920 fs/namei.c:4148 do_unlinkat+0x3c9/0x650 fs/namei.c:4216 __do_sys_unlink fs/namei.c:4264 [inline] __se_sys_unlink fs/namei.c:4262 [inline] __x64_sys_unlink+0xc6/0x110 fs/namei.c:4262 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #1 (jbd2_handle){++++}-{0:0}: start_this_handle+0xfe7/0x14a0 fs/jbd2/transaction.c:463 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x3a8/0x4a0 fs/ext4/ext4_jbd2.c:105 ext4_sample_last_mounted fs/ext4/file.c:820 [inline] ext4_file_open+0x5e7/0xb50 fs/ext4/file.c:849 do_dentry_open+0x4a1/0x11e0 fs/open.c:824 do_open fs/namei.c:3476 [inline] path_openat+0x1c71/0x2910 fs/namei.c:3609 do_filp_open+0x1aa/0x400 fs/namei.c:3636 do_sys_openat2+0x16d/0x4c0 fs/open.c:1213 do_sys_open fs/open.c:1229 [inline] __do_sys_openat fs/open.c:1245 [inline] __se_sys_openat fs/open.c:1240 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1240 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #0 (sb_internal){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3065 [inline] check_prevs_add kernel/locking/lockdep.c:3188 [inline] validate_chain kernel/locking/lockdep.c:3803 [inline] __lock_acquire+0x2ac6/0x56c0 kernel/locking/lockdep.c:5029 lock_acquire kernel/locking/lockdep.c:5641 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1698 [inline] sb_start_intwrite include/linux/fs.h:1815 [inline] ext4_evict_inode+0xe81/0x1960 fs/ext4/inode.c:240 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1744 [inline] iput.part.0+0x562/0x820 fs/inode.c:1770 iput+0x58/0x70 fs/inode.c:1760 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401 __dentry_kill+0x3c0/0x640 fs/dcache.c:607 dentry_kill fs/dcache.c:745 [inline] dput+0x64d/0xdb0 fs/dcache.c:913 ovl_entry_stack_free fs/overlayfs/super.c:61 [inline] ovl_dentry_release+0xca/0x130 fs/overlayfs/super.c:74 __dentry_kill+0x42b/0x640 fs/dcache.c:612 shrink_dentry_list+0x23c/0x800 fs/dcache.c:1201 prune_dcache_sb+0xe7/0x140 fs/dcache.c:1282 super_cache_scan+0x336/0x590 fs/super.c:104 do_shrink_slab+0x42d/0xbd0 mm/vmscan.c:774 shrink_slab_memcg mm/vmscan.c:843 [inline] shrink_slab+0x3ee/0x6f0 mm/vmscan.c:922 shrink_node_memcgs mm/vmscan.c:3100 [inline] shrink_node+0x8b3/0x1df0 mm/vmscan.c:3221 shrink_zones mm/vmscan.c:3458 [inline] do_try_to_free_pages+0x3b5/0x1700 mm/vmscan.c:3516 try_to_free_pages+0x2ac/0x840 mm/vmscan.c:3751 __perform_reclaim mm/page_alloc.c:4624 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4646 [inline] __alloc_pages_slowpath.constprop.0+0xac7/0x20e0 mm/page_alloc.c:5046 __alloc_pages+0x412/0x500 mm/page_alloc.c:5421 __alloc_pages_node include/linux/gfp.h:587 [inline] khugepaged_alloc_page+0xa0/0x170 mm/khugepaged.c:868 collapse_huge_page mm/khugepaged.c:1071 [inline] khugepaged_scan_pmd mm/khugepaged.c:1357 [inline] khugepaged_scan_mm_slot mm/khugepaged.c:2167 [inline] khugepaged_do_scan mm/khugepaged.c:2248 [inline] khugepaged+0x3474/0x66e0 mm/khugepaged.c:2293 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 other info that might help us debug this: Chain exists of: sb_internal --> fscrypt_init_mutex --> fs_reclaim Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(fscrypt_init_mutex); lock(fs_reclaim); lock(sb_internal); *** DEADLOCK *** 3 locks held by khugepaged/49: #0: ffffffff8beac660 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4621 [inline] #0: ffffffff8beac660 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4646 [inline] #0: ffffffff8beac660 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0xa1e/0x20e0 mm/page_alloc.c:5046 #1: ffffffff8be6e310 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab_memcg mm/vmscan.c:816 [inline] #1: ffffffff8be6e310 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x2b4/0x6f0 mm/vmscan.c:922 #2: ffff8880241a40e0 (&type->s_umount_key#75){++++}-{3:3}, at: trylock_super fs/super.c:415 [inline] #2: ffff8880241a40e0 (&type->s_umount_key#75){++++}-{3:3}, at: super_cache_scan+0x6c/0x590 fs/super.c:79 stack backtrace: CPU: 2 PID: 49 Comm: khugepaged Not tainted 5.18.0-rc2-syzkaller-00351-ga2c29ccd9477 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2145 check_prev_add kernel/locking/lockdep.c:3065 [inline] check_prevs_add kernel/locking/lockdep.c:3188 [inline] validate_chain kernel/locking/lockdep.c:3803 [inline] __lock_acquire+0x2ac6/0x56c0 kernel/locking/lockdep.c:5029 lock_acquire kernel/locking/lockdep.c:5641 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1698 [inline] sb_start_intwrite include/linux/fs.h:1815 [inline] ext4_evict_inode+0xe81/0x1960 fs/ext4/inode.c:240 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1744 [inline] iput.part.0+0x562/0x820 fs/inode.c:1770 iput+0x58/0x70 fs/inode.c:1760 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401 __dentry_kill+0x3c0/0x640 fs/dcache.c:607 dentry_kill fs/dcache.c:745 [inline] dput+0x64d/0xdb0 fs/dcache.c:913 ovl_entry_stack_free fs/overlayfs/super.c:61 [inline] ovl_dentry_release+0xca/0x130 fs/overlayfs/super.c:74 __dentry_kill+0x42b/0x640 fs/dcache.c:612 shrink_dentry_list+0x23c/0x800 fs/dcache.c:1201 prune_dcache_sb+0xe7/0x140 fs/dcache.c:1282 super_cache_scan+0x336/0x590 fs/super.c:104 do_shrink_slab+0x42d/0xbd0 mm/vmscan.c:774 shrink_slab_memcg mm/vmscan.c:843 [inline] shrink_slab+0x3ee/0x6f0 mm/vmscan.c:922 shrink_node_memcgs mm/vmscan.c:3100 [inline] shrink_node+0x8b3/0x1df0 mm/vmscan.c:3221 shrink_zones mm/vmscan.c:3458 [inline] do_try_to_free_pages+0x3b5/0x1700 mm/vmscan.c:3516 try_to_free_pages+0x2ac/0x840 mm/vmscan.c:3751 __perform_reclaim mm/page_alloc.c:4624 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4646 [inline] __alloc_pages_slowpath.constprop.0+0xac7/0x20e0 mm/page_alloc.c:5046 __alloc_pages+0x412/0x500 mm/page_alloc.c:5421 __alloc_pages_node include/linux/gfp.h:587 [inline] khugepaged_alloc_page+0xa0/0x170 mm/khugepaged.c:868 collapse_huge_page mm/khugepaged.c:1071 [inline] khugepaged_scan_pmd mm/khugepaged.c:1357 [inline] khugepaged_scan_mm_slot mm/khugepaged.c:2167 [inline] khugepaged_do_scan mm/khugepaged.c:2248 [inline] khugepaged+0x3474/0x66e0 mm/khugepaged.c:2293 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298