loop0: detected capacity change from 0 to 1024 EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: writeback. ====================================================== WARNING: possible circular locking dependency detected 5.15.146-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor408/5148 is trying to acquire lock: ffff88807376fe68 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x57/0x510 fs/quota/dquot.c:505 but task is already holding lock: ffff8880737fa060 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x9e0/0x1e00 fs/ext4/inode.c:638 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->i_data_sem/2){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1488 ext4_map_blocks+0x3a6/0x1e00 fs/ext4/inode.c:568 ext4_getblk+0x19f/0x710 fs/ext4/inode.c:846 ext4_bread+0x2a/0x170 fs/ext4/inode.c:899 ext4_quota_read+0x1a1/0x2c0 fs/ext4/super.c:6500 read_blk fs/quota/quota_tree.c:55 [inline] find_tree_dqentry+0x192/0xb60 fs/quota/quota_tree.c:617 find_tree_dqentry+0x41a/0xb60 fs/quota/quota_tree.c:635 find_dqentry fs/quota/quota_tree.c:647 [inline] qtree_read_dquot+0x13f/0x650 fs/quota/quota_tree.c:667 v2_read_dquot+0xbe/0x100 fs/quota/quota_v2.c:333 dquot_acquire+0x188/0x680 fs/quota/dquot.c:461 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6180 dqget+0x74e/0xe30 fs/quota/dquot.c:984 __dquot_initialize+0x2d9/0xe10 fs/quota/dquot.c:1562 ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474 ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4966 mount_bdev+0x2c9/0x3f0 fs/super.c:1387 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1517 do_new_mount+0x28b/0xae0 fs/namespace.c:2994 do_mount fs/namespace.c:3337 [inline] __do_sys_mount fs/namespace.c:3545 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3522 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 (&s->s_dquot.dqio_sem){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1488 v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332 dquot_acquire+0x188/0x680 fs/quota/dquot.c:461 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6180 dqget+0x74e/0xe30 fs/quota/dquot.c:984 __dquot_initialize+0x2d9/0xe10 fs/quota/dquot.c:1562 ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474 ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4966 mount_bdev+0x2c9/0x3f0 fs/super.c:1387 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1517 do_new_mount+0x28b/0xae0 fs/namespace.c:2994 do_mount fs/namespace.c:3337 [inline] __do_sys_mount fs/namespace.c:3545 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3522 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 (&dquot->dq_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __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 dquot_commit+0x57/0x510 fs/quota/dquot.c:505 ext4_write_dquot+0x1e8/0x2b0 fs/ext4/super.c:6164 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty fs/quota/dquot.c:410 [inline] __dquot_alloc_space+0x53a/0xf30 fs/quota/dquot.c:1792 dquot_alloc_space_nodirty include/linux/quotaops.h:297 [inline] dquot_alloc_space include/linux/quotaops.h:310 [inline] dquot_alloc_block include/linux/quotaops.h:334 [inline] ext4_mb_new_blocks+0x12bb/0x4d50 fs/ext4/mballoc.c:5644 ext4_ext_map_blocks+0x1986/0x7220 fs/ext4/extents.c:4287 ext4_map_blocks+0xaad/0x1e00 fs/ext4/inode.c:645 ext4_convert_inline_data_nolock+0x483/0xda0 fs/ext4/inline.c:1246 ext4_convert_inline_data+0x4cf/0x610 fs/ext4/inline.c:2056 ext4_fallocate+0x148/0x20c0 fs/ext4/extents.c:4705 vfs_fallocate+0x54a/0x6b0 fs/open.c:308 do_vfs_ioctl+0x2317/0x2b70 fs/ioctl.c:853 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x81/0x160 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: &dquot->dq_lock --> &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(&dquot->dq_lock); *** DEADLOCK *** 5 locks held by syz-executor408/5148: #0: ffff888077488460 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3009 [inline] #0: ffff888077488460 (sb_writers#5){.+.+}-{0:0}, at: vfs_fallocate+0x4bd/0x6b0 fs/open.c:307 #1: ffff8880737fa1d8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff8880737fa1d8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_fallocate+0x140/0x20c0 fs/ext4/extents.c:4704 #2: ffff8880737f9eb0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] #2: ffff8880737f9eb0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x3ab/0x610 fs/ext4/inline.c:2054 #3: ffff8880737fa060 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x9e0/0x1e00 fs/ext4/inode.c:638 #4: ffffffff8ca42958 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:268 stack backtrace: CPU: 1 PID: 5148 Comm: syz-executor408 Not tainted 5.15.146-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 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+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __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 dquot_commit+0x57/0x510 fs/quota/dquot.c:505 ext4_write_dquot+0x1e8/0x2b0 fs/ext4/super.c:6164 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty fs/quota/dquot.c:410 [inline] __dquot_alloc_space+0x53a/0xf30 fs/quota/dquot.c:1792 dquot_alloc_space_nodirty include/linux/quotaops.h:297 [inline] dquot_alloc_space include/linux/quotaops.h:310 [inline] dquot_alloc_block include/linux/quotaops.h:334 [inline] ext4_mb_new_blocks+0x12bb/0x4d50 fs/ext4/mballoc.c:5644 ext4_ext_map_blocks+0x1986/0x7220 fs/ext4/extents.c:4287 ext4_map_blocks+0xaad/0x1e00 fs/ext4/inode.c:645 ext4_convert_inline_data_nolock+0x483/0xda0 fs/ext4/inline.c:1246 ext4_convert_inline_data+0x4cf/0x610 fs/ext4/inline.c:2056 ext4_fallocate+0x148/0x20c0 fs/ext4/extents.c:4705 vfs_fallocate+0x54a/0x6b0 fs/open.c:308 do_vfs_ioctl+0x2317/0x2b70 fs/ioctl.c:853 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x81/0x160 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: 0033:0x7ff5af10b4e9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 18 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:00007fff0b80bf78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007ff5af10b4e9 RDX: 0000000020000100 RSI: 0000000040305829 RDI: 0000000000000005 RBP: 0000000000000000 R08: 00007fff0b80bfb0 R09: 00007fff0b80bfb0 R10: 00007fff0b80bfb0 R11: 0000000000000246 R12: 00007fff0b80bf9c R13: 0000000000000314 R14: 431bde82d7b634db R15: 00007fff0b80bfd0