====================================================== WARNING: possible circular locking dependency detected 5.15.171-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/4027 is trying to acquire lock: ffff0000e6ede628 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x2bc/0x1a44 fs/ext4/inode.c:597 but task is already holding lock: ffff0000d9890208 (&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+0xc0/0x398 kernel/locking/rwsem.c:1498 v2_read_dquot+0x50/0x11c fs/quota/quota_v2.c:332 dquot_acquire+0x130/0x5e4 fs/quota/dquot.c:463 ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6193 dqget+0x664/0xd0c fs/quota/dquot.c:986 __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1515 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1577 ext4_mkdir+0x15c/0xa74 fs/ext4/namei.c:3059 vfs_mkdir+0x334/0x4e4 fs/namei.c:4065 do_mkdirat+0x20c/0x610 fs/namei.c:4090 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4103 __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+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 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+0x194/0x2154 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743 dquot_commit+0x54/0x240 fs/quota/dquot.c:507 ext4_write_dquot+0x1b4/0x314 fs/ext4/super.c:6173 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6233 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412 __dquot_alloc_space+0xb54/0xf7c fs/quota/dquot.c:1750 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+0xe78/0x4278 fs/ext4/mballoc.c:5739 ext4_ext_map_blocks+0x1500/0x6418 fs/ext4/extents.c:4339 ext4_map_blocks+0x8d0/0x1a44 fs/ext4/inode.c:672 ext4_getblk+0x160/0x688 fs/ext4/inode.c:869 ext4_bread+0x3c/0x1d4 fs/ext4/inode.c:922 ext4_append+0x260/0x4cc fs/ext4/namei.c:83 ext4_init_new_dir+0x294/0x8f4 fs/ext4/namei.c:3030 ext4_mkdir+0x3d4/0xa74 fs/ext4/namei.c:3076 vfs_mkdir+0x334/0x4e4 fs/namei.c:4065 do_mkdirat+0x20c/0x610 fs/namei.c:4090 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4103 __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+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #0 (&ei->i_data_sem/2){++++}-{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+0x32d4/0x7638 kernel/locking/lockdep.c:5012 lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623 down_read+0xc0/0x398 kernel/locking/rwsem.c:1498 ext4_map_blocks+0x2bc/0x1a44 fs/ext4/inode.c:597 ext4_getblk+0x160/0x688 fs/ext4/inode.c:869 ext4_bread+0x3c/0x1d4 fs/ext4/inode.c:922 ext4_quota_write+0x238/0x564 fs/ext4/super.c:6567 write_blk fs/quota/quota_tree.c:64 [inline] get_free_dqblk+0x2dc/0x6a0 fs/quota/quota_tree.c:125 do_insert_tree+0x238/0x14cc fs/quota/quota_tree.c:335 do_insert_tree+0x4b8/0x14cc fs/quota/quota_tree.c:366 dq_insert_tree fs/quota/quota_tree.c:392 [inline] qtree_write_dquot+0x318/0x488 fs/quota/quota_tree.c:411 v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:358 dquot_acquire+0x2cc/0x5e4 fs/quota/dquot.c:472 ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6193 dqget+0x664/0xd0c fs/quota/dquot.c:986 __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1515 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1577 ext4_unlink+0x134/0x6a0 fs/ext4/namei.c:3363 vfs_unlink+0x2f0/0x508 fs/namei.c:4280 do_unlinkat+0x4cc/0x830 fs/namei.c:4348 __do_sys_unlinkat fs/namei.c:4391 [inline] __se_sys_unlinkat fs/namei.c:4384 [inline] __arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4384 __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+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 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/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/4027: #0: ffff0000d9890460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:377 #1: ffff0000e6d903f0 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:824 [inline] #1: ffff0000e6d903f0 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x2d0/0x830 fs/namei.c:4331 #2: ffff0000e6d90de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline] #2: ffff0000e6d90de8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: vfs_unlink+0xd8/0x508 fs/namei.c:4269 #3: ffff0000e6f6e428 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x68/0x5e4 fs/quota/dquot.c:460 #4: ffff0000d9890208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x11c/0x188 fs/quota/quota_v2.c:354 stack backtrace: CPU: 0 PID: 4027 Comm: syz-executor Not tainted 5.15.171-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2011 check_noncircular+0x2cc/0x378 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+0x32d4/0x7638 kernel/locking/lockdep.c:5012 lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623 down_read+0xc0/0x398 kernel/locking/rwsem.c:1498 ext4_map_blocks+0x2bc/0x1a44 fs/ext4/inode.c:597 ext4_getblk+0x160/0x688 fs/ext4/inode.c:869 ext4_bread+0x3c/0x1d4 fs/ext4/inode.c:922 ext4_quota_write+0x238/0x564 fs/ext4/super.c:6567 write_blk fs/quota/quota_tree.c:64 [inline] get_free_dqblk+0x2dc/0x6a0 fs/quota/quota_tree.c:125 do_insert_tree+0x238/0x14cc fs/quota/quota_tree.c:335 do_insert_tree+0x4b8/0x14cc fs/quota/quota_tree.c:366 dq_insert_tree fs/quota/quota_tree.c:392 [inline] qtree_write_dquot+0x318/0x488 fs/quota/quota_tree.c:411 v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:358 dquot_acquire+0x2cc/0x5e4 fs/quota/dquot.c:472 ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6193 dqget+0x664/0xd0c fs/quota/dquot.c:986 __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1515 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1577 ext4_unlink+0x134/0x6a0 fs/ext4/namei.c:3363 vfs_unlink+0x2f0/0x508 fs/namei.c:4280 do_unlinkat+0x4cc/0x830 fs/namei.c:4348 __do_sys_unlinkat fs/namei.c:4391 [inline] __se_sys_unlinkat fs/namei.c:4384 [inline] __arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4384 __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+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 NILFS (loop2): DAT doesn't have a block to manage vblocknr = 8796093022222 NILFS error (device loop2): nilfs_bmap_truncate: broken bmap (inode number=16) Remounting filesystem read-only NILFS (loop2): error -5 truncating bmap (ino=16) NILFS (loop2): disposed unprocessed dirty file(s) when detaching log writer NILFS (loop2): discard dirty page: offset=0, ino=2 NILFS (loop2): discard dirty block: blocknr=18, size=1024 NILFS (loop2): discard dirty block: blocknr=18446744073709551615, size=1024 NILFS (loop2): discard dirty block: blocknr=18446744073709551615, size=1024 NILFS (loop2): discard dirty block: blocknr=18446744073709551615, size=1024 NILFS (loop2): discard dirty page: offset=0, ino=6 NILFS (loop2): discard dirty block: blocknr=35, size=1024 NILFS (loop2): discard dirty block: blocknr=36, size=1024 NILFS (loop2): discard dirty block: blocknr=37, size=1024 NILFS (loop2): discard dirty block: blocknr=38, size=1024 NILFS (loop2): discard dirty page: offset=4096, ino=6 NILFS (loop2): discard dirty block: blocknr=39, size=1024 NILFS (loop2): discard dirty block: blocknr=18446744073709551615, size=1024 NILFS (loop2): discard dirty block: blocknr=18446744073709551615, size=1024 NILFS (loop2): discard dirty block: blocknr=18446744073709551615, size=1024 NILFS (loop2): discard dirty page: offset=0, ino=3 NILFS (loop2): discard dirty block: blocknr=42, size=1024 NILFS (loop2): discard dirty block: blocknr=43, size=1024 NILFS (loop2): discard dirty block: blocknr=44, size=1024 NILFS (loop2): discard dirty block: blocknr=18446744073709551615, size=1024 NILFS (loop2): discard dirty page: offset=163840, ino=3 NILFS (loop2): discard dirty block: blocknr=18446744073709551615, size=1024 NILFS (loop2): discard dirty block: blocknr=18446744073709551615, size=1024 NILFS (loop2): discard dirty block: blocknr=47, size=1024 NILFS (loop2): discard dirty block: blocknr=18446744073709551615, size=1024 NILFS (loop2): discard dirty page: offset=229376, ino=3 NILFS (loop2): discard dirty block: blocknr=18446744073709551615, size=1024 NILFS (loop2): discard dirty block: blocknr=18446744073709551615, size=1024 NILFS (loop2): discard dirty block: blocknr=50, size=1024 NILFS (loop2): discard dirty block: blocknr=18446744073709551615, size=1024