loop3: detected capacity change from 0 to 512 EXT4-fs (loop3): mounted filesystem without journal. Quota mode: writeback. ====================================================== WARNING: possible circular locking dependency detected 6.1.110-syzkaller #0 Not tainted ------------------------------------------------------ syz.3.562/6602 is trying to acquire lock: ffff0000e10948c0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x77c/0x1810 fs/ext4/inode.c:671 but task is already holding lock: ffff0000cacd6208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x11c/0x188 fs/quota/quota_v2.c:357 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+0x64/0x308 kernel/locking/rwsem.c:1520 v2_read_dquot+0x50/0x11c fs/quota/quota_v2.c:335 dquot_acquire+0x130/0x5c4 fs/quota/dquot.c:463 ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6796 dqget+0x660/0xcec fs/quota/dquot.c:986 __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1515 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1577 ext4_rmdir+0x120/0x940 fs/ext4/namei.c:3199 vfs_rmdir+0x308/0x43c fs/namei.c:4193 do_rmdir+0x2e0/0x720 fs/namei.c:4254 __do_sys_unlinkat fs/namei.c:4434 [inline] __se_sys_unlinkat fs/namei.c:4428 [inline] __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4428 __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:140 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #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+0x38/0x44 kernel/locking/mutex.c:799 dquot_commit+0x54/0x240 fs/quota/dquot.c:507 ext4_write_dquot+0x1b4/0x314 fs/ext4/super.c:6776 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6836 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412 __dquot_free_space+0x840/0xce4 fs/quota/dquot.c:1940 dquot_free_space_nodirty include/linux/quotaops.h:379 [inline] dquot_free_space include/linux/quotaops.h:384 [inline] dquot_free_block include/linux/quotaops.h:395 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:6145 [inline] ext4_free_blocks+0x1b48/0x2b68 fs/ext4/mballoc.c:6275 ext4_remove_blocks fs/ext4/extents.c:2521 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2687 [inline] ext4_ext_remove_space+0x1bd0/0x4544 fs/ext4/extents.c:2935 ext4_ext_truncate+0x168/0x210 fs/ext4/extents.c:4448 ext4_truncate+0xa08/0x1178 fs/ext4/inode.c:4288 ext4_evict_inode+0xc3c/0x12cc fs/ext4/inode.c:286 evict+0x418/0x894 fs/inode.c:701 iput_final fs/inode.c:1826 [inline] iput+0x7c0/0x8a4 fs/inode.c:1852 do_unlinkat+0x530/0x70c fs/namei.c:4399 __do_sys_unlinkat fs/namei.c:4435 [inline] __se_sys_unlinkat fs/namei.c:4428 [inline] __arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4428 __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:140 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (&ei->i_data_sem/2){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ext4_map_blocks+0x77c/0x1810 fs/ext4/inode.c:671 ext4_getblk+0x198/0x6ec fs/ext4/inode.c:889 ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:945 ext4_quota_write+0x230/0x54c fs/ext4/super.c:7170 write_blk fs/quota/quota_tree.c:70 [inline] find_free_dqentry+0x550/0xa5c fs/quota/quota_tree.c:318 do_insert_tree+0x600/0xec4 fs/quota/quota_tree.c:400 do_insert_tree+0x7fc/0xec4 fs/quota/quota_tree.c:402 do_insert_tree+0x7fc/0xec4 fs/quota/quota_tree.c:402 do_insert_tree+0x7fc/0xec4 fs/quota/quota_tree.c:402 dq_insert_tree fs/quota/quota_tree.c:432 [inline] qtree_write_dquot+0x3c8/0x4d8 fs/quota/quota_tree.c:451 v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:361 dquot_acquire+0x2c4/0x5c4 fs/quota/dquot.c:472 ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6796 dqget+0x660/0xcec fs/quota/dquot.c:986 __dquot_initialize+0x2c8/0xc04 fs/quota/dquot.c:1515 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1577 ext4_symlink+0x194/0x9bc fs/ext4/namei.c:3429 vfs_symlink+0x244/0x3a8 fs/namei.c:4473 do_symlinkat+0x1bc/0x45c fs/namei.c:4502 __do_sys_symlinkat fs/namei.c:4519 [inline] __se_sys_symlinkat fs/namei.c:4516 [inline] __arm64_sys_symlinkat+0xa4/0xbc fs/namei.c:4516 __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:140 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 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 *** 4 locks held by syz.3.562/6602: #0: ffff0000cacd6460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:393 #1: ffff0000e1096850 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff0000e1096850 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x204/0x468 fs/namei.c:3878 #2: ffff0000e11a8ce8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x68/0x5c4 fs/quota/dquot.c:460 #3: ffff0000cacd6208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x11c/0x188 fs/quota/quota_v2.c:357 stack backtrace: CPU: 0 PID: 6602 Comm: syz.3.562 Not tainted 6.1.110-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __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:2048 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ext4_map_blocks+0x77c/0x1810 fs/ext4/inode.c:671 ext4_getblk+0x198/0x6ec fs/ext4/inode.c:889 ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:945 ext4_quota_write+0x230/0x54c fs/ext4/super.c:7170 write_blk fs/quota/quota_tree.c:70 [inline] find_free_dqentry+0x550/0xa5c fs/quota/quota_tree.c:318 do_insert_tree+0x600/0xec4 fs/quota/quota_tree.c:400 do_insert_tree+0x7fc/0xec4 fs/quota/quota_tree.c:402 do_insert_tree+0x7fc/0xec4 fs/quota/quota_tree.c:402 do_insert_tree+0x7fc/0xec4 fs/quota/quota_tree.c:402 dq_insert_tree fs/quota/quota_tree.c:432 [inline] qtree_write_dquot+0x3c8/0x4d8 fs/quota/quota_tree.c:451 v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:361 dquot_acquire+0x2c4/0x5c4 fs/quota/dquot.c:472 ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6796 dqget+0x660/0xcec fs/quota/dquot.c:986 __dquot_initialize+0x2c8/0xc04 fs/quota/dquot.c:1515 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1577 ext4_symlink+0x194/0x9bc fs/ext4/namei.c:3429 vfs_symlink+0x244/0x3a8 fs/namei.c:4473 do_symlinkat+0x1bc/0x45c fs/namei.c:4502 __do_sys_symlinkat fs/namei.c:4519 [inline] __se_sys_symlinkat fs/namei.c:4516 [inline] __arm64_sys_symlinkat+0xa4/0xbc fs/namei.c:4516 __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:140 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 EXT4-fs error (device loop3): ext4_validate_block_bitmap:438: comm syz.3.562: bg 0: block 344: padding at end of block bitmap is not set Quota error (device loop3): write_blk: dquota write failed Quota error (device loop3): find_free_dqentry: Can't write quota data block 5 Quota error (device loop3): qtree_write_dquot: Error -28 occurred while creating quota EXT4-fs error (device loop3): ext4_acquire_dquot:6800: comm syz.3.562: Failed to acquire dquot type 1