====================================================== WARNING: possible circular locking dependency detected 5.15.173-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/9303 is trying to acquire lock: ffff88806057e968 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x57/0x510 fs/quota/dquot.c:507 but task is already holding lock: ffff8880578b5c30 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0x974/0x1130 fs/ext4/inode.c:4244 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:1498 ext4_map_blocks+0x391/0x1c70 fs/ext4/inode.c:597 ext4_getblk+0x19f/0x710 fs/ext4/inode.c:869 ext4_bread+0x2a/0x170 fs/ext4/inode.c:922 ext4_quota_write+0x21e/0x580 fs/ext4/super.c:6567 write_blk fs/quota/quota_tree.c:64 [inline] get_free_dqblk+0x3a9/0x800 fs/quota/quota_tree.c:125 do_insert_tree+0x2b4/0x1c20 fs/quota/quota_tree.c:335 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 dq_insert_tree fs/quota/quota_tree.c:392 [inline] qtree_write_dquot+0x3b9/0x530 fs/quota/quota_tree.c:411 v2_write_dquot+0x11c/0x190 fs/quota/quota_v2.c:358 dquot_acquire+0x34d/0x680 fs/quota/dquot.c:472 ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6193 dqget+0x762/0xe90 fs/quota/dquot.c:986 __dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1515 ext4_setattr+0x2a0/0x1990 fs/ext4/inode.c:5399 notify_change+0xc6d/0xf50 fs/attr.c:505 do_truncate+0x21c/0x300 fs/open.c:65 vfs_truncate+0x2dd/0x3a0 fs/open.c:111 do_sys_truncate+0xda/0x190 fs/open.c:134 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #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:1498 v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332 dquot_acquire+0x188/0x680 fs/quota/dquot.c:463 ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6193 dqget+0x762/0xe90 fs/quota/dquot.c:986 __dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1515 ext4_mkdir+0x197/0xce0 fs/ext4/namei.c:3059 vfs_mkdir+0x3b6/0x590 fs/namei.c:4065 do_mkdirat+0x260/0x520 fs/namei.c:4090 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4103 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #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:507 ext4_write_dquot+0x1fd/0x360 fs/ext4/super.c:6173 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0xf7/0x400 fs/quota/dquot.c:412 __dquot_free_space+0x932/0xe40 fs/quota/dquot.c:1940 dquot_free_space_nodirty include/linux/quotaops.h:376 [inline] dquot_free_space include/linux/quotaops.h:381 [inline] dquot_free_block include/linux/quotaops.h:392 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:6156 [inline] ext4_free_blocks+0x1f5c/0x2e90 fs/ext4/mballoc.c:6286 ext4_remove_blocks fs/ext4/extents.c:2523 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2689 [inline] ext4_ext_remove_space+0x24da/0x4db0 fs/ext4/extents.c:2937 ext4_ext_truncate+0x191/0x250 fs/ext4/extents.c:4471 ext4_truncate+0x9fd/0x1130 fs/ext4/inode.c:4249 ext4_evict_inode+0xba1/0x1100 fs/ext4/inode.c:289 evict+0x529/0x930 fs/inode.c:622 d_delete_notify include/linux/fsnotify.h:267 [inline] vfs_rmdir+0x33c/0x460 fs/namei.c:4162 do_rmdir+0x368/0x670 fs/namei.c:4210 __do_sys_unlinkat fs/namei.c:4390 [inline] __se_sys_unlinkat fs/namei.c:4384 [inline] __x64_sys_unlinkat+0xdc/0xf0 fs/namei.c:4384 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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-executor/9303: #0: ffff888065b88460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377 #1: ffff888060527198 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:824 [inline] #1: ffff888060527198 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: do_rmdir+0x225/0x670 fs/namei.c:4197 #2: ffff888065b88650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1813 [inline] #2: ffff888065b88650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1930 [inline] #2: ffff888065b88650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x375/0x1100 fs/ext4/inode.c:243 #3: ffff8880578b5c30 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0x974/0x1130 fs/ext4/inode.c:4244 #4: ffffffff8ca43c58 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311 stack backtrace: CPU: 0 PID: 9303 Comm: syz-executor Not tainted 5.15.173-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 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:507 ext4_write_dquot+0x1fd/0x360 fs/ext4/super.c:6173 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0xf7/0x400 fs/quota/dquot.c:412 __dquot_free_space+0x932/0xe40 fs/quota/dquot.c:1940 dquot_free_space_nodirty include/linux/quotaops.h:376 [inline] dquot_free_space include/linux/quotaops.h:381 [inline] dquot_free_block include/linux/quotaops.h:392 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:6156 [inline] ext4_free_blocks+0x1f5c/0x2e90 fs/ext4/mballoc.c:6286 ext4_remove_blocks fs/ext4/extents.c:2523 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2689 [inline] ext4_ext_remove_space+0x24da/0x4db0 fs/ext4/extents.c:2937 ext4_ext_truncate+0x191/0x250 fs/ext4/extents.c:4471 ext4_truncate+0x9fd/0x1130 fs/ext4/inode.c:4249 ext4_evict_inode+0xba1/0x1100 fs/ext4/inode.c:289 evict+0x529/0x930 fs/inode.c:622 d_delete_notify include/linux/fsnotify.h:267 [inline] vfs_rmdir+0x33c/0x460 fs/namei.c:4162 do_rmdir+0x368/0x670 fs/namei.c:4210 __do_sys_unlinkat fs/namei.c:4390 [inline] __se_sys_unlinkat fs/namei.c:4384 [inline] __x64_sys_unlinkat+0xdc/0xf0 fs/namei.c:4384 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f5de5962df7 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe529bcda8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f5de5962df7 RDX: 0000000000000200 RSI: 00007ffe529bdf50 RDI: 00000000ffffff9c RBP: 00007f5de59d65fc R08: 00005555803b466b R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000207 R12: 00007ffe529bdf50 R13: 00007f5de59d65fc R14: 000000000003e476 R15: 00007ffe529c0100 attempt to access beyond end of device loop4: rw=2049, want=45152, limit=40427