====================================================== WARNING: possible circular locking dependency detected 5.15.182-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor298/4219 is trying to acquire lock: ffff0000e252d238 (&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: ffff0000e2427020 (&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+0xc0/0x390 kernel/locking/rwsem.c:1498 ext4_map_blocks+0x288/0x167c fs/ext4/inode.c:598 ext4_getblk+0x138/0x5f0 fs/ext4/inode.c:870 ext4_bread+0x3c/0x1d4 fs/ext4/inode.c:923 ext4_quota_read+0x17c/0x354 fs/ext4/super.c:6545 read_blk fs/quota/quota_tree.c:55 [inline] find_tree_dqentry+0x15c/0x934 fs/quota/quota_tree.c:617 find_tree_dqentry+0x300/0x934 fs/quota/quota_tree.c:635 find_tree_dqentry+0x300/0x934 fs/quota/quota_tree.c:635 find_tree_dqentry+0x300/0x934 fs/quota/quota_tree.c:635 find_dqentry fs/quota/quota_tree.c:647 [inline] qtree_read_dquot+0x12c/0x618 fs/quota/quota_tree.c:667 v2_read_dquot+0xbc/0x118 fs/quota/quota_v2.c:333 dquot_acquire+0x120/0x510 fs/quota/dquot.c:463 ext4_acquire_dquot+0x270/0x428 fs/ext4/super.c:6200 dqget+0x658/0xcf4 fs/quota/dquot.c:988 __dquot_initialize+0x264/0xa80 fs/quota/dquot.c:1517 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1579 ext4_process_orphan+0x5c/0x2b4 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x888/0xf8c fs/ext4/orphan.c:474 ext4_fill_super+0x7a5c/0x812c fs/ext4/super.c:4975 mount_bdev+0x264/0x358 fs/super.c:1400 ext4_mount+0x44/0x58 fs/ext4/super.c:6627 legacy_get_tree+0xd4/0x16c fs/fs_context.c:611 vfs_get_tree+0x90/0x274 fs/super.c:1530 do_new_mount+0x228/0x810 fs/namespace.c:3013 path_mount+0x5b4/0x1000 fs/namespace.c:3343 do_mount fs/namespace.c:3356 [inline] __do_sys_mount fs/namespace.c:3564 [inline] __se_sys_mount fs/namespace.c:3541 [inline] __arm64_sys_mount+0x514/0x5e4 fs/namespace.c:3541 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}: down_read+0xc0/0x390 kernel/locking/rwsem.c:1498 v2_read_dquot+0x4c/0x118 fs/quota/quota_v2.c:332 dquot_acquire+0x120/0x510 fs/quota/dquot.c:463 ext4_acquire_dquot+0x270/0x428 fs/ext4/super.c:6200 dqget+0x658/0xcf4 fs/quota/dquot.c:988 __dquot_initialize+0x2d4/0xa80 fs/quota/dquot.c:1517 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1579 ext4_create+0x94/0x3fc fs/ext4/namei.c:2876 lookup_open fs/namei.c:3462 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x1144/0x26e4 fs/namei.c:3739 do_filp_open+0x164/0x330 fs/namei.c:3769 do_sys_openat2+0x128/0x3d8 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __arm64_sys_openat+0x120/0x154 fs/open.c:1280 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #1 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 dquot_commit+0x50/0x1c4 fs/quota/dquot.c:507 ext4_write_dquot+0x1b4/0x31c fs/ext4/super.c:6180 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6257 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412 __dquot_alloc_space+0x560/0xd0c fs/quota/dquot.c:1752 dquot_alloc_space_nodirty include/linux/quotaops.h:297 [inline] dquot_alloc_space+0x2c/0x8c include/linux/quotaops.h:310 swap_inode_boot_loader+0xa1c/0xc60 fs/ext4/ioctl.c:243 __ext4_ioctl fs/ext4/ioctl.c:1056 [inline] ext4_ioctl+0x1840/0x3600 fs/ext4/ioctl.c:1276 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #0 (&ei->i_data_sem/1){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 down_write_nested+0xc0/0x130 kernel/locking/rwsem.c:1667 ext4_double_down_write_data_sem+0x3c/0x4c fs/ext4/move_extent.c:-1 swap_inode_boot_loader+0x3f0/0xc60 fs/ext4/ioctl.c:176 __ext4_ioctl fs/ext4/ioctl.c:1056 [inline] ext4_ioctl+0x1840/0x3600 fs/ext4/ioctl.c:1276 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 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 *** 6 locks held by syz-executor298/4219: #0: ffff0000d4f76460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write_file+0x64/0x1e8 fs/namespace.c:421 #1: ffff0000e2427198 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff0000e2427198 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: lock_two_nondirectories+0xd0/0x128 fs/inode.c:1147 #2: ffff0000e252d3b0 (&sb->s_type->i_mutex_key#9/4){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline] #2: ffff0000e252d3b0 (&sb->s_type->i_mutex_key#9/4){+.+.}-{3:3}, at: lock_two_nondirectories+0xb8/0x128 fs/inode.c:1149 #3: ffff0000e2427338 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline] #3: ffff0000e2427338 (mapping.invalidate_lock){++++}-{3:3}, at: swap_inode_boot_loader+0x278/0xc60 fs/ext4/ioctl.c:152 #4: ffff0000d4f7c990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xecc/0x11a4 fs/jbd2/transaction.c:462 #5: ffff0000e2427020 (&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: 4219 Comm: syz-executor298 Not tainted 5.15.182-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2011 check_noncircular+0x240/0x2d4 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 kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 down_write_nested+0xc0/0x130 kernel/locking/rwsem.c:1667 ext4_double_down_write_data_sem+0x3c/0x4c fs/ext4/move_extent.c:-1 swap_inode_boot_loader+0x3f0/0xc60 fs/ext4/ioctl.c:176 __ext4_ioctl fs/ext4/ioctl.c:1056 [inline] ext4_ioctl+0x1840/0x3600 fs/ext4/ioctl.c:1276 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 loop0: detected capacity change from 0 to 512 EXT4-fs (loop0): ext4_check_descriptors: Block bitmap for group 1 overlaps superblock EXT4-fs (loop0): ext4_check_descriptors: Inode bitmap for group 1 overlaps superblock EXT4-fs (loop0): ext4_check_descriptors: Inode table for group 1 overlaps superblock EXT4-fs (loop0): revision level too high, forcing read-only mode [EXT4 FS bs=4096, gc=2, bpg=34, ipg=32, mo=c040e118, mo2=0000] EXT4-fs (loop0): orphan cleanup on readonly fs EXT4-fs error (device loop0): ext4_validate_block_bitmap:438: comm syz-executor298: bg 0: block 34: padding at end of block bitmap is not set EXT4-fs error (device loop0): ext4_read_block_bitmap_nowait:476: comm syz-executor298: Invalid block bitmap block 0 in block_group 1 EXT4-fs error (device loop0): ext4_acquire_dquot:6204: comm syz-executor298: Failed to acquire dquot type 1 EXT4-fs (loop0): ext4_process_orphan: truncating inode 13 to 1050 bytes EXT4-fs (loop0): 1 truncate cleaned up