====================================================== WARNING: possible circular locking dependency detected 5.15.108-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/6461 is trying to acquire lock: ffff888027a6abd0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] ffff888027a6abd0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1675 but task is already holding lock: ffff888069a51ce0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: btrfs_free_stale_devices+0x14b/0xb00 fs/btrfs/volumes.c:603 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (&fs_devs->device_list_mutex){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 insert_dev_extents fs/btrfs/block-group.c:2345 [inline] btrfs_create_pending_block_groups+0x5c1/0x1130 fs/btrfs/block-group.c:2395 __btrfs_end_transaction+0x296/0x780 fs/btrfs/transaction.c:1007 find_free_extent_update_loop fs/btrfs/extent-tree.c:4044 [inline] find_free_extent+0x4297/0x5000 fs/btrfs/extent-tree.c:4393 btrfs_reserve_extent+0x20a/0x540 fs/btrfs/extent-tree.c:4474 cow_file_range+0x674/0xe10 fs/btrfs/inode.c:1181 btrfs_run_delalloc_range+0x38b/0x1500 fs/btrfs/inode.c:2018 writepage_delalloc+0x283/0x5a0 fs/btrfs/extent_io.c:3802 __extent_writepage+0x57d/0xbc0 fs/btrfs/extent_io.c:4108 extent_write_cache_pages fs/btrfs/extent_io.c:5029 [inline] extent_writepages+0xbbd/0x1590 fs/btrfs/extent_io.c:5156 do_writepages+0x481/0x730 mm/page-writeback.c:2364 filemap_fdatawrite_wbc+0x1d6/0x230 mm/filemap.c:400 start_delalloc_inodes+0x7df/0xca0 fs/btrfs/inode.c:10064 btrfs_start_delalloc_roots+0x72f/0xa70 fs/btrfs/inode.c:10143 shrink_delalloc fs/btrfs/space-info.c:538 [inline] flush_space+0x650/0xd50 fs/btrfs/space-info.c:646 btrfs_async_reclaim_metadata_space+0x29b/0x340 fs/btrfs/space-info.c:953 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2306 worker_thread+0xaca/0x1280 kernel/workqueue.c:2453 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 -> #5 (sb_internal#3){.+.+}-{0:0}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1742 [inline] sb_start_intwrite include/linux/fs.h:1859 [inline] start_transaction+0x5a8/0x11a0 fs/btrfs/transaction.c:677 btrfs_dirty_inode+0xcc/0x1c0 fs/btrfs/inode.c:6322 inode_update_time fs/inode.c:1787 [inline] touch_atime+0x34e/0x680 fs/inode.c:1860 file_accessed include/linux/fs.h:2447 [inline] btrfs_file_mmap+0xbf/0x120 fs/btrfs/file.c:2424 call_mmap include/linux/fs.h:2108 [inline] mmap_region+0x10e7/0x1670 mm/mmap.c:1791 do_mmap+0x78d/0xe00 mm/mmap.c:1575 vm_mmap_pgoff+0x1ca/0x2d0 mm/util.c:551 ksys_mmap_pgoff+0x559/0x780 mm/mmap.c:1624 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #4 (&mm->mmap_lock#2){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 down_write+0x97/0x170 kernel/locking/rwsem.c:1541 mmap_write_lock include/linux/mmap_lock.h:71 [inline] mpol_rebind_mm+0x34/0x2b0 mm/mempolicy.c:381 cpuset_attach+0x393/0x540 kernel/cgroup/cpuset.c:2289 cgroup_migrate_execute+0x7fb/0x10e0 kernel/cgroup/cgroup.c:2559 cgroup_attach_task+0x58a/0x840 kernel/cgroup/cgroup.c:2854 __cgroup1_procs_write+0x2ec/0x460 kernel/cgroup/cgroup-v1.c:528 cgroup_file_write+0x2ac/0x670 kernel/cgroup/cgroup.c:3932 kernfs_fop_write_iter+0x3a2/0x4f0 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2103 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacf/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #3 (&cpuset_rwsem){++++}-{0:0}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] cpuset_read_lock+0x40/0x150 kernel/cgroup/cpuset.c:356 __sched_setscheduler+0x626/0x1df0 kernel/sched/core.c:7409 _sched_setscheduler kernel/sched/core.c:7586 [inline] sched_setscheduler_nocheck+0x187/0x2d0 kernel/sched/core.c:7633 __kthread_create_on_node+0x31b/0x3f0 kernel/kthread.c:413 kthread_create_on_node+0xda/0x120 kernel/kthread.c:453 cryptomgr_schedule_test crypto/algboss.c:219 [inline] cryptomgr_notify+0x125/0xc70 crypto/algboss.c:240 notifier_call_chain kernel/notifier.c:83 [inline] blocking_notifier_call_chain+0x104/0x1b0 kernel/notifier.c:318 crypto_probing_notify+0x21/0x70 crypto/api.c:251 crypto_wait_for_test+0x3e/0xd0 crypto/algapi.c:396 crypto_register_alg+0x25b/0x330 crypto/algapi.c:429 do_one_initcall+0x22b/0x7a0 init/main.c:1306 do_initcall_level+0x157/0x207 init/main.c:1379 do_initcalls+0x49/0x86 init/main.c:1395 kernel_init_freeable+0x43c/0x5c5 init/main.c:1619 kernel_init+0x19/0x290 init/main.c:1510 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 -> #2 ((crypto_chain).rwsem){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 down_read+0x3b/0x50 kernel/locking/rwsem.c:1488 blocking_notifier_call_chain+0x5e/0x1b0 kernel/notifier.c:317 crypto_probing_notify crypto/api.c:251 [inline] crypto_alg_mod_lookup+0x4e6/0x710 crypto/api.c:281 crypto_find_alg crypto/api.c:490 [inline] crypto_alloc_tfm_node+0x12c/0x350 crypto/api.c:527 cryptd_alloc_skcipher+0xde/0x1f0 crypto/cryptd.c:916 simd_skcipher_init+0x63/0x130 crypto/simd.c:122 crypto_create_tfm_node+0x105/0x360 crypto/api.c:457 crypto_alloc_tfm_node+0x15d/0x350 crypto/api.c:533 fscrypt_allocate_skcipher fs/crypto/keysetup.c:84 [inline] fscrypt_prepare_key+0x89/0x360 fs/crypto/keysetup.c:135 fscrypt_set_per_file_enc_key fs/crypto/keysetup.c:160 [inline] fscrypt_setup_v2_file_key fs/crypto/keysetup.c:349 [inline] setup_file_encryption_key fs/crypto/keysetup.c:474 [inline] fscrypt_setup_encryption_info+0xcf4/0x13a0 fs/crypto/keysetup.c:553 fscrypt_prepare_new_inode+0x208/0x2f0 fs/crypto/keysetup.c:698 __ext4_new_inode+0x86b/0x4390 fs/ext4/ialloc.c:988 ext4_mkdir+0x421/0xce0 fs/ext4/namei.c:2991 vfs_mkdir+0x419/0x640 fs/namei.c:3994 do_mkdirat+0x260/0x520 fs/namei.c:4019 __do_sys_mkdir fs/namei.c:4039 [inline] __se_sys_mkdir fs/namei.c:4037 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4037 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #1 (&mk->mk_sem){.+.+}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 down_read+0x3b/0x50 kernel/locking/rwsem.c:1488 setup_file_encryption_key fs/crypto/keysetup.c:456 [inline] fscrypt_setup_encryption_info+0x5b6/0x13a0 fs/crypto/keysetup.c:553 fscrypt_prepare_new_inode+0x208/0x2f0 fs/crypto/keysetup.c:698 __ext4_new_inode+0x86b/0x4390 fs/ext4/ialloc.c:988 ext4_create+0x275/0x550 fs/ext4/namei.c:2808 lookup_open fs/namei.c:3392 [inline] open_last_lookups fs/namei.c:3462 [inline] path_openat+0x12f6/0x2f20 fs/namei.c:3669 do_filp_open+0x21c/0x460 fs/namei.c:3699 do_sys_openat2+0x13b/0x500 fs/open.c:1211 do_sys_open fs/open.c:1227 [inline] __do_sys_creat fs/open.c:1301 [inline] __se_sys_creat fs/open.c:1295 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1295 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #0 (&type->i_mutex_dir_key#4){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 down_read+0x3b/0x50 kernel/locking/rwsem.c:1488 inode_lock_shared include/linux/fs.h:797 [inline] lookup_slow+0x45/0x70 fs/namei.c:1675 walk_component+0x48c/0x610 fs/namei.c:1972 lookup_last fs/namei.c:2427 [inline] path_lookupat+0x16f/0x450 fs/namei.c:2451 filename_lookup+0x230/0x5c0 fs/namei.c:2480 kern_path+0x37/0x180 fs/namei.c:2570 lookup_bdev+0xc1/0x280 block/bdev.c:979 device_matched fs/btrfs/volumes.c:568 [inline] btrfs_free_stale_devices+0x71f/0xb00 fs/btrfs/volumes.c:608 btrfs_forget_devices+0x52/0x80 fs/btrfs/volumes.c:1380 btrfs_control_ioctl+0x108/0x210 fs/btrfs/super.c:2451 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb other info that might help us debug this: Chain exists of: &type->i_mutex_dir_key#4 --> sb_internal#3 --> &fs_devs->device_list_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&fs_devs->device_list_mutex); lock(sb_internal#3); lock(&fs_devs->device_list_mutex); lock(&type->i_mutex_dir_key#4); *** DEADLOCK *** 2 locks held by syz-executor.1/6461: #0: ffffffff8cdf1248 (uuid_mutex){+.+.}-{3:3}, at: btrfs_forget_devices+0x1a/0x80 fs/btrfs/volumes.c:1379 #1: ffff888069a51ce0 (&fs_devs->device_list_mutex){+.+.}-{3:3}, at: btrfs_free_stale_devices+0x14b/0xb00 fs/btrfs/volumes.c:603 stack backtrace: CPU: 0 PID: 6461 Comm: syz-executor.1 Not tainted 5.15.108-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 down_read+0x3b/0x50 kernel/locking/rwsem.c:1488 inode_lock_shared include/linux/fs.h:797 [inline] lookup_slow+0x45/0x70 fs/namei.c:1675 walk_component+0x48c/0x610 fs/namei.c:1972 lookup_last fs/namei.c:2427 [inline] path_lookupat+0x16f/0x450 fs/namei.c:2451 filename_lookup+0x230/0x5c0 fs/namei.c:2480 kern_path+0x37/0x180 fs/namei.c:2570 lookup_bdev+0xc1/0x280 block/bdev.c:979 device_matched fs/btrfs/volumes.c:568 [inline] btrfs_free_stale_devices+0x71f/0xb00 fs/btrfs/volumes.c:608 btrfs_forget_devices+0x52/0x80 fs/btrfs/volumes.c:1380 btrfs_control_ioctl+0x108/0x210 fs/btrfs/super.c:2451 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f675d4e4169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f675ba56168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f675d603f80 RCX: 00007f675d4e4169 RDX: 00000000200031c0 RSI: 0000000050009405 RDI: 0000000000000003 RBP: 00007f675d53fca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc579fbaaf R14: 00007f675ba56300 R15: 0000000000022000