EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: writeback. ====================================================== WARNING: possible circular locking dependency detected 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Not tainted ------------------------------------------------------ syz-executor.5/11405 is trying to acquire lock: ffff000135c08288 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x2ac/0x1884 fs/ext4/inode.c:574 but task is already holding lock: ffff0000de0a0208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x11c/0x188 fs/quota/quota_v2.c:354 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}: down_read+0x50/0x6c kernel/locking/rwsem.c:1520 v2_read_dquot+0x50/0x11c fs/quota/quota_v2.c:332 dquot_acquire+0x130/0x5c4 fs/quota/dquot.c:435 ext4_acquire_dquot+0x270/0x398 fs/ext4/super.c:6770 dqget+0x844/0xc48 fs/quota/dquot.c:914 __dquot_initialize+0x344/0xb54 fs/quota/dquot.c:1492 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1550 ext4_create+0xb4/0x480 fs/ext4/namei.c:2801 lookup_open fs/namei.c:3416 [inline] open_last_lookups fs/namei.c:3484 [inline] path_openat+0xf80/0x27f8 fs/namei.c:3712 do_filp_open+0x1bc/0x3cc fs/namei.c:3742 do_sys_openat2+0x128/0x3d8 fs/open.c:1348 do_sys_open fs/open.c:1364 [inline] __do_sys_openat fs/open.c:1380 [inline] __se_sys_openat fs/open.c:1375 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1375 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 -> #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+0x2c/0x38 kernel/locking/mutex.c:799 dquot_commit+0x54/0x240 fs/quota/dquot.c:479 ext4_write_dquot+0x1b4/0x288 fs/ext4/super.c:6754 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6802 mark_dquot_dirty fs/quota/dquot.c:346 [inline] mark_all_dquot_dirty fs/quota/dquot.c:384 [inline] __dquot_alloc_space+0x48c/0xd20 fs/quota/dquot.c:1722 dquot_alloc_space_nodirty include/linux/quotaops.h:300 [inline] dquot_alloc_space include/linux/quotaops.h:313 [inline] dquot_alloc_block include/linux/quotaops.h:337 [inline] ext4_mb_new_blocks+0xed4/0x43dc fs/ext4/mballoc.c:5571 ext4_ext_map_blocks+0x1378/0x5f50 fs/ext4/extents.c:4286 ext4_map_blocks+0x828/0x1884 fs/ext4/inode.c:651 _ext4_get_block+0x1c8/0x5f0 fs/ext4/inode.c:807 ext4_get_block+0x4c/0x60 fs/ext4/inode.c:824 ext4_block_write_begin+0x52c/0x14ec fs/ext4/inode.c:1097 ext4_write_begin+0x5f8/0x12f8 ext4_da_write_begin+0x350/0x9b0 fs/ext4/inode.c:3057 generic_perform_write+0x278/0x55c mm/filemap.c:3926 ext4_buffered_write_iter+0x2e0/0x538 fs/ext4/file.c:289 ext4_file_write_iter+0x188/0x16c8 call_write_iter include/linux/fs.h:1851 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x610/0x914 fs/read_write.c:584 ksys_write+0x15c/0x26c fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 -> #0 (&ei->i_data_sem/2){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x238/0x718 kernel/locking/lockdep.c:5669 down_read+0x50/0x6c kernel/locking/rwsem.c:1520 ext4_map_blocks+0x2ac/0x1884 fs/ext4/inode.c:574 ext4_getblk+0x198/0x6ec fs/ext4/inode.c:863 ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:919 ext4_quota_write+0x230/0x54c fs/ext4/super.c:7135 write_blk fs/quota/quota_tree.c:64 [inline] get_free_dqblk+0x284/0x570 fs/quota/quota_tree.c:130 do_insert_tree+0x200/0x1438 fs/quota/quota_tree.c:340 do_insert_tree+0x534/0x1438 fs/quota/quota_tree.c:375 dq_insert_tree fs/quota/quota_tree.c:401 [inline] qtree_write_dquot+0x318/0x488 fs/quota/quota_tree.c:420 v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:358 dquot_acquire+0x2c4/0x5c4 fs/quota/dquot.c:444 ext4_acquire_dquot+0x270/0x398 fs/ext4/super.c:6770 dqget+0x844/0xc48 fs/quota/dquot.c:914 dquot_transfer+0x3a8/0x5c0 fs/quota/dquot.c:2117 ext4_setattr+0x8bc/0x1628 fs/ext4/inode.c:5496 notify_change+0xa84/0xd20 fs/attr.c:482 chown_common+0x438/0x700 fs/open.c:774 vfs_fchown fs/open.c:842 [inline] ksys_fchown+0xe0/0x158 fs/open.c:853 __do_sys_fchown fs/open.c:861 [inline] __se_sys_fchown fs/open.c:859 [inline] __arm64_sys_fchown+0x7c/0x94 fs/open.c:859 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 other info that might help us debug this: Chain exists of: &ei->i_data_sem/2 --> &dquot->dq_lock --> &s->s_dquot.dqio_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&s->s_dquot.dqio_sem); lock(&dquot->dq_lock); lock(&s->s_dquot.dqio_sem); lock(&ei->i_data_sem/2); *** DEADLOCK *** 5 locks held by syz-executor.5/11405: #0: ffff0000de0a0460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write_file+0x64/0x1e8 fs/namespace.c:438 #1: ffff000132bf2218 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff000132bf2218 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: chown_common+0x348/0x700 fs/open.c:764 #2: ffff000132bf1ee0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0x8ac/0x1628 fs/ext4/inode.c:5495 #3: ffff000135fea5e8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x68/0x5c4 fs/quota/dquot.c:432 #4: ffff0000de0a0208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x11c/0x188 fs/quota/quota_v2.c:354 stack backtrace: CPU: 1 PID: 11405 Comm: syz-executor.5 Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2056 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x238/0x718 kernel/locking/lockdep.c:5669 down_read+0x50/0x6c kernel/locking/rwsem.c:1520 ext4_map_blocks+0x2ac/0x1884 fs/ext4/inode.c:574 ext4_getblk+0x198/0x6ec fs/ext4/inode.c:863 ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:919 ext4_quota_write+0x230/0x54c fs/ext4/super.c:7135 write_blk fs/quota/quota_tree.c:64 [inline] get_free_dqblk+0x284/0x570 fs/quota/quota_tree.c:130 do_insert_tree+0x200/0x1438 fs/quota/quota_tree.c:340 do_insert_tree+0x534/0x1438 fs/quota/quota_tree.c:375 dq_insert_tree fs/quota/quota_tree.c:401 [inline] qtree_write_dquot+0x318/0x488 fs/quota/quota_tree.c:420 v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:358 dquot_acquire+0x2c4/0x5c4 fs/quota/dquot.c:444 ext4_acquire_dquot+0x270/0x398 fs/ext4/super.c:6770 dqget+0x844/0xc48 fs/quota/dquot.c:914 dquot_transfer+0x3a8/0x5c0 fs/quota/dquot.c:2117 ext4_setattr+0x8bc/0x1628 fs/ext4/inode.c:5496 notify_change+0xa84/0xd20 fs/attr.c:482 chown_common+0x438/0x700 fs/open.c:774 vfs_fchown fs/open.c:842 [inline] ksys_fchown+0xe0/0x158 fs/open.c:853 __do_sys_fchown fs/open.c:861 [inline] __se_sys_fchown fs/open.c:859 [inline] __arm64_sys_fchown+0x7c/0x94 fs/open.c:859 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591