program: syz_mount_image$ext4(&(0x7f0000000240)='ext4\x00', &(0x7f0000000280)='mnt\x00', 0x4, &(0x7f0000000040), 0x0, 0x258, &(0x7f0000000780)="$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") r0 = openat(0xffffffffffffff9c, &(0x7f0000000540)='mnt\x00', 0x0, 0x0) ioctl$FS_IOC_ADD_ENCRYPTION_KEY(r0, 0xc0506617, &(0x7f0000000580)={@id={0x2, 0x0, @a}, 0x40, 0x0, '\x00', @a}) mkdirat(0xffffffffffffff9c, &(0x7f0000000640)='mnt/encrypted_dir\x00', 0x0) r1 = openat(0xffffffffffffff9c, &(0x7f0000000680)='mnt/encrypted_dir\x00', 0x800, 0x0) ioctl$FS_IOC_SET_ENCRYPTION_POLICY(r1, 0x800c6613, &(0x7f00000006c0)=@v2={0x2, @aes256, 0x0, '\x00', @a}) chdir(&(0x7f00000002c0)='mnt/encrypted_dir\x00') symlink(&(0x7f00000000c0)='mnt/encrypted_dir\x00', &(0x7f0000000100)='./file0\x00') ioctl$FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS(r1, 0xc0406619, &(0x7f0000000080)={@id={0x2, 0x0, @a}}) socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000200)={0xffffffffffffffff, 0xffffffffffffffff}) sendmmsg$unix(r2, &(0x7f0000002d00)=[{{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x820}}, {{&(0x7f0000001580)=@file={0x1, './file0\x00'}, 0x6e, 0x0, 0x0, 0x0, 0x0, 0x40042}}], 0x2, 0x20000000) [ 87.502309][ T4680] Bluetooth: hci0: command tx timeout [ 87.700764][ T5336] loop0: detected capacity change from 0 to 128 [ 87.845681][ T5336] EXT4-fs (loop0): mounted filesystem 76b65be2-f6da-4727-8c75-0525a5b65a09 r/w without journal. Quota mode: none. [ 87.902440][ T5336] ext4 filesystem being mounted at /0/mnt supports timestamps until 2038-01-19 (0x7fffffff) [ 87.946886][ T5336] fscrypt: AES-256-CBC-CTS using implementation "cts-cbc-aes-aesni" [ 87.993651][ T5336] fscrypt: loop0: 1 inode(s) still busy after removing key with identifier 69b2f6edeee720cce0577937eb8a6751, including ino 12 [ 88.077957][ T72] [ 88.078983][ T72] ====================================================== [ 88.081765][ T72] WARNING: possible circular locking dependency detected [ 88.084731][ T72] syzkaller #0 Not tainted [ 88.086598][ T72] ------------------------------------------------------ [ 88.089654][ T72] kswapd0/72 is trying to acquire lock: [ 88.092009][ T72] ffff888011fcb098 (&type->lock_class){+.+.}-{4:4}, at: keyring_clear+0xaf/0x240 [ 88.096023][ T72] [ 88.096023][ T72] but task is already holding lock: [ 88.099247][ T72] ffffffff8e251780 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x92a/0x2820 [ 88.102483][ T72] [ 88.102483][ T72] which lock already depends on the new lock. [ 88.102483][ T72] [ 88.106565][ T72] [ 88.106565][ T72] the existing dependency chain (in reverse order) is: [ 88.109849][ T72] [ 88.109849][ T72] -> #1 (fs_reclaim){+.+.}-{0:0}: [ 88.112637][ T72] fs_reclaim_acquire+0x72/0x100 [ 88.114911][ T72] __kmalloc_cache_noprof+0x40/0x700 [ 88.117383][ T72] assoc_array_insert+0x92/0x2f90 [ 88.119741][ T72] __key_link_begin+0xd6/0x1f0 [ 88.122121][ T72] __key_create_or_update+0x41a/0xa30 [ 88.124606][ T72] key_create_or_update+0x42/0x60 [ 88.126929][ T72] x509_load_certificate_list+0x145/0x280 [ 88.129706][ T72] do_one_initcall+0x1fb/0x820 [ 88.132008][ T72] do_initcall_level+0x104/0x190 [ 88.134342][ T72] do_initcalls+0x59/0xa0 [ 88.136447][ T72] kernel_init_freeable+0x334/0x4b0 [ 88.138926][ T72] kernel_init+0x1d/0x1d0 [ 88.141111][ T72] ret_from_fork+0x599/0xb30 [ 88.143325][ T72] ret_from_fork_asm+0x1a/0x30 [ 88.145641][ T72] [ 88.145641][ T72] -> #0 (&type->lock_class){+.+.}-{4:4}: [ 88.149061][ T72] __lock_acquire+0x15a6/0x2cf0 [ 88.151441][ T72] lock_acquire+0x117/0x340 [ 88.153633][ T72] down_write+0x96/0x1f0 [ 88.155554][ T72] keyring_clear+0xaf/0x240 [ 88.157646][ T72] fscrypt_put_master_key+0xca/0x190 [ 88.160113][ T72] put_crypt_info+0x26d/0x310 [ 88.162356][ T72] fscrypt_put_encryption_info+0xf6/0x140 [ 88.164974][ T72] ext4_clear_inode+0x170/0x2f0 [ 88.167242][ T72] ext4_evict_inode+0x9f6/0xe60 [ 88.169540][ T72] evict+0x5f4/0xae0 [ 88.171498][ T72] __dentry_kill+0x209/0x660 [ 88.173682][ T72] shrink_kill+0xa9/0x2c0 [ 88.175770][ T72] shrink_dentry_list+0x2e0/0x5e0 [ 88.178174][ T72] prune_dcache_sb+0x10e/0x180 [ 88.180383][ T72] super_cache_scan+0x369/0x4b0 [ 88.182799][ T72] do_shrink_slab+0x6df/0x10d0 [ 88.184997][ T72] shrink_slab+0x7ef/0x10d0 [ 88.187152][ T72] shrink_one+0x2d9/0x720 [ 88.189059][ T72] shrink_node+0x2f7d/0x35b0 [ 88.191162][ T72] kswapd+0x145a/0x2820 [ 88.193065][ T72] kthread+0x711/0x8a0 [ 88.194952][ T72] ret_from_fork+0x599/0xb30 [ 88.197008][ T72] ret_from_fork_asm+0x1a/0x30 [ 88.199184][ T72] [ 88.199184][ T72] other info that might help us debug this: [ 88.199184][ T72] [ 88.203394][ T72] Possible unsafe locking scenario: [ 88.203394][ T72] [ 88.206425][ T72] CPU0 CPU1 [ 88.208612][ T72] ---- ---- [ 88.210996][ T72] lock(fs_reclaim); [ 88.212714][ T72] lock(&type->lock_class); [ 88.215652][ T72] lock(fs_reclaim); [ 88.218601][ T72] lock(&type->lock_class); [ 88.220487][ T72] [ 88.220487][ T72] *** DEADLOCK *** [ 88.220487][ T72] [ 88.223854][ T72] 2 locks held by kswapd0/72: [ 88.225880][ T72] #0: ffffffff8e251780 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x92a/0x2820 [ 88.229239][ T72] #1: ffff8880119200e0 (&type->s_umount_key#32){++++}-{4:4}, at: super_cache_scan+0x91/0x4b0 [ 88.233291][ T72] [ 88.233291][ T72] stack backtrace: [ 88.235700][ T72] CPU: 0 UID: 0 PID: 72 Comm: kswapd0 Not tainted syzkaller #0 PREEMPT(full) [ 88.235718][ T72] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 88.235725][ T72] Call Trace: [ 88.235733][ T72] [ 88.235739][ T72] dump_stack_lvl+0x189/0x250 [ 88.235754][ T72] ? __pfx_dump_stack_lvl+0x10/0x10 [ 88.235768][ T72] ? __pfx__printk+0x10/0x10 [ 88.235782][ T72] ? print_lock_name+0xde/0x100 [ 88.235795][ T72] print_circular_bug+0x2e2/0x300 [ 88.235809][ T72] check_noncircular+0x12e/0x150 [ 88.235822][ T72] __lock_acquire+0x15a6/0x2cf0 [ 88.235837][ T72] ? keyring_clear+0xaf/0x240 [ 88.235846][ T72] lock_acquire+0x117/0x340 [ 88.235855][ T72] ? keyring_clear+0xaf/0x240 [ 88.235867][ T72] down_write+0x96/0x1f0 [ 88.235881][ T72] ? keyring_clear+0xaf/0x240 [ 88.235890][ T72] ? __pfx_down_write+0x10/0x10 [ 88.235903][ T72] keyring_clear+0xaf/0x240 [ 88.235909][ T72] ? __pfx_keyring_clear+0x10/0x10 [ 88.235916][ T72] fscrypt_put_master_key+0xca/0x190 [ 88.235928][ T72] put_crypt_info+0x26d/0x310 [ 88.235938][ T72] fscrypt_put_encryption_info+0xf6/0x140 [ 88.235947][ T72] ext4_clear_inode+0x170/0x2f0 [ 88.235957][ T72] ext4_evict_inode+0x9f6/0xe60 [ 88.235968][ T72] ? inode_wait_for_writeback+0x14d/0x370 [ 88.235983][ T72] ? __pfx_inode_wait_for_writeback+0x10/0x10 [ 88.235995][ T72] ? __pfx_ext4_evict_inode+0x10/0x10 [ 88.236005][ T72] ? do_raw_spin_unlock+0x4d/0x240 [ 88.236018][ T72] ? __pfx_ext4_evict_inode+0x10/0x10 [ 88.236028][ T72] evict+0x5f4/0xae0 [ 88.236043][ T72] ? __pfx_evict+0x10/0x10 [ 88.236056][ T72] ? _raw_spin_unlock+0x28/0x50 [ 88.236066][ T72] ? iput+0xcc6/0x1030 [ 88.236074][ T72] __dentry_kill+0x209/0x660 [ 88.236086][ T72] ? shrink_kill+0x8d/0x2c0 [ 88.236096][ T72] shrink_kill+0xa9/0x2c0 [ 88.236106][ T72] shrink_dentry_list+0x2e0/0x5e0 [ 88.236119][ T72] prune_dcache_sb+0x10e/0x180 [ 88.236130][ T72] ? __pfx_prune_dcache_sb+0x10/0x10 [ 88.236141][ T72] ? list_lru_count_one+0x27/0x2c0 [ 88.236155][ T72] ? list_lru_count_one+0x264/0x2c0 [ 88.236170][ T72] super_cache_scan+0x369/0x4b0 [ 88.236185][ T72] do_shrink_slab+0x6df/0x10d0 [ 88.236198][ T72] shrink_slab+0x7ef/0x10d0 [ 88.236208][ T72] ? shrink_slab+0x1e8/0x10d0 [ 88.236219][ T72] ? __pfx_shrink_slab+0x10/0x10 [ 88.236231][ T72] shrink_one+0x2d9/0x720 [ 88.236248][ T72] ? shrink_node+0x2d3f/0x35b0 [ 88.236262][ T72] shrink_node+0x2f7d/0x35b0 [ 88.236278][ T72] ? shrink_node+0x2d3f/0x35b0 [ 88.236292][ T72] ? __lock_acquire+0x6b6/0x2cf0 [ 88.236304][ T72] ? percpu_ref_put+0x19/0x180 [ 88.236315][ T72] ? __pfx_shrink_node+0x10/0x10 [ 88.236327][ T72] ? percpu_ref_put+0x19/0x180 [ 88.236338][ T72] ? mem_cgroup_iter+0x420/0x460 [ 88.236351][ T72] ? mem_cgroup_iter+0x3b/0x460 [ 88.236362][ T72] kswapd+0x145a/0x2820 [ 88.236377][ T72] ? kswapd+0x92a/0x2820 [ 88.236388][ T72] ? __pfx_kswapd+0x10/0x10 [ 88.236396][ T72] ? do_raw_spin_lock+0x121/0x290 [ 88.236403][ T72] ? raw_spin_rq_lock_nested+0x2a/0x140 [ 88.236411][ T72] ? __pfx_do_raw_spin_lock+0x10/0x10 [ 88.236422][ T72] ? _raw_spin_unlock_irqrestore+0xad/0x110 [ 88.236428][ T72] ? _raw_spin_unlock+0x30/0x50 [ 88.236435][ T72] ? __pfx_autoremove_wake_function+0x10/0x10 [ 88.236444][ T72] ? __pfx_set_cpus_allowed_ptr+0x10/0x10 [ 88.236452][ T72] ? __kthread_parkme+0x7b/0x200 [ 88.236459][ T72] ? __kthread_parkme+0x1a1/0x200 [ 88.236466][ T72] kthread+0x711/0x8a0 [ 88.236476][ T72] ? __pfx_kswapd+0x10/0x10 [ 88.236485][ T72] ? __pfx_kthread+0x10/0x10 [ 88.236497][ T72] ? _raw_spin_unlock_irq+0x23/0x50 [ 88.236508][ T72] ? lockdep_hardirqs_on+0x98/0x140 [ 88.236518][ T72] ? __pfx_kthread+0x10/0x10 [ 88.236530][ T72] ret_from_fork+0x599/0xb30 [ 88.236541][ T72] ? __pfx_ret_from_fork+0x10/0x10 [ 88.236569][ T72] ? __pfx_kthread+0x10/0x10 [ 88.236582][ T72] ret_from_fork_asm+0x1a/0x30 [ 88.236598][ T72]