loop0: detected capacity change from 0 to 1024 EXT4-fs: Warning: mounting with an experimental mount option 'dioread_nolock' for blocksize < PAGE_SIZE ====================================================== WARNING: possible circular locking dependency detected 6.1.134-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor182/5887 is trying to acquire lock: ffff0000e41670e0 (&ei->i_data_sem/1){+.+.}-{3:3}, at: ext4_double_down_write_data_sem+0x3c/0x4c fs/ext4/move_extent.c:-1 but task is already holding lock: ffff0000e1bdd2c8 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_double_down_write_data_sem+0x30/0x4c fs/ext4/move_extent.c:-1 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ei->i_data_sem/2){++++}-{3:3}: down_read+0x64/0x308 kernel/locking/rwsem.c:1520 ext4_map_blocks+0x2ac/0x1810 fs/ext4/inode.c:603 ext4_getblk+0x198/0x6e8 fs/ext4/inode.c:889 ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:945 ext4_quota_read+0x16c/0x294 fs/ext4/super.c:7126 read_blk fs/quota/quota_tree.c:61 [inline] find_tree_dqentry+0x180/0xc5c fs/quota/quota_tree.c:671 find_tree_dqentry+0x504/0xc5c fs/quota/quota_tree.c:698 find_tree_dqentry+0x504/0xc5c fs/quota/quota_tree.c:698 find_tree_dqentry+0x504/0xc5c fs/quota/quota_tree.c:698 find_dqentry fs/quota/quota_tree.c:716 [inline] qtree_read_dquot+0x460/0x73c fs/quota/quota_tree.c:736 v2_read_dquot+0xc0/0x11c fs/quota/quota_v2.c:336 dquot_acquire+0x130/0x5c4 fs/quota/dquot.c:463 ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6798 dqget+0x660/0xcec fs/quota/dquot.c:988 __dquot_initialize+0x2c8/0xc04 fs/quota/dquot.c:1517 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1579 ext4_process_orphan+0x5c/0x2b8 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x974/0x1134 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5523 [inline] ext4_fill_super+0x6f00/0x73a4 fs/ext4/super.c:5654 get_tree_bdev+0x360/0x54c fs/super.c:1366 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5684 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x278/0x8fc fs/namespace.c:3056 path_mount+0x590/0xe5c fs/namespace.c:3386 do_mount fs/namespace.c:3399 [inline] __do_sys_mount fs/namespace.c:3607 [inline] __se_sys_mount fs/namespace.c:3584 [inline] __arm64_sys_mount+0x498/0x588 fs/namespace.c:3584 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}: down_read+0x64/0x308 kernel/locking/rwsem.c:1520 v2_read_dquot+0x50/0x11c fs/quota/quota_v2.c:335 dquot_acquire+0x130/0x5c4 fs/quota/dquot.c:463 ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6798 dqget+0x660/0xcec fs/quota/dquot.c:988 __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1517 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1579 ext4_create+0xb4/0x480 fs/ext4/namei.c:2876 lookup_open fs/namei.c:3482 [inline] open_last_lookups fs/namei.c:3550 [inline] path_openat+0xeac/0x2548 fs/namei.c:3780 do_filp_open+0x1bc/0x3cc fs/namei.c:3810 do_sys_openat2+0x128/0x3e0 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1345 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #1 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 dquot_commit+0x54/0x240 fs/quota/dquot.c:507 ext4_write_dquot+0x1b4/0x314 fs/ext4/super.c:6778 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6838 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412 __dquot_alloc_space+0xb28/0xf50 fs/quota/dquot.c:1752 dquot_alloc_space_nodirty include/linux/quotaops.h:300 [inline] dquot_alloc_space include/linux/quotaops.h:313 [inline] swap_inode_boot_loader fs/ext4/ioctl.c:494 [inline] __ext4_ioctl fs/ext4/ioctl.c:1424 [inline] ext4_ioctl+0x5c7c/0x6b24 fs/ext4/ioctl.c:1614 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (&ei->i_data_sem/1){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 down_write_nested+0x64/0x94 kernel/locking/rwsem.c:1689 ext4_double_down_write_data_sem+0x3c/0x4c fs/ext4/move_extent.c:-1 swap_inode_boot_loader fs/ext4/ioctl.c:426 [inline] __ext4_ioctl fs/ext4/ioctl.c:1424 [inline] ext4_ioctl+0x4e8c/0x6b24 fs/ext4/ioctl.c:1614 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 other info that might help us debug this: Chain exists of: &ei->i_data_sem/1 --> &s->s_dquot.dqio_sem --> &ei->i_data_sem/2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->i_data_sem/2); lock(&s->s_dquot.dqio_sem); lock(&ei->i_data_sem/2); lock(&ei->i_data_sem/1); *** DEADLOCK *** 5 locks held by syz-executor182/5887: #0: ffff0000d99fe460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write_file+0x64/0x1e8 fs/namespace.c:437 #1: ffff0000e1bdd440 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff0000e1bdd440 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: lock_two_nondirectories+0xd4/0x120 fs/inode.c:1208 #2: ffff0000e4167258 (&sb->s_type->i_mutex_key#9/4){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #2: ffff0000e4167258 (&sb->s_type->i_mutex_key#9/4){+.+.}-{3:3}, at: lock_two_nondirectories+0xc4/0x120 fs/inode.c:1210 #3: ffff0000e1bdd5e0 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:803 [inline] #3: ffff0000e1bdd5e0 (mapping.invalidate_lock){++++}-{3:3}, at: swap_inode_boot_loader fs/ext4/ioctl.c:402 [inline] #3: ffff0000e1bdd5e0 (mapping.invalidate_lock){++++}-{3:3}, at: __ext4_ioctl fs/ext4/ioctl.c:1424 [inline] #3: ffff0000e1bdd5e0 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_ioctl+0x4964/0x6b24 fs/ext4/ioctl.c:1614 #4: ffff0000e1bdd2c8 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_double_down_write_data_sem+0x30/0x4c fs/ext4/move_extent.c:-1 stack backtrace: CPU: 0 PID: 5887 Comm: syz-executor182 Not tainted 6.1.134-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 down_write_nested+0x64/0x94 kernel/locking/rwsem.c:1689 ext4_double_down_write_data_sem+0x3c/0x4c fs/ext4/move_extent.c:-1 swap_inode_boot_loader fs/ext4/ioctl.c:426 [inline] __ext4_ioctl fs/ext4/ioctl.c:1424 [inline] ext4_ioctl+0x4e8c/0x6b24 fs/ext4/ioctl.c:1614 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585