loop6: detected capacity change from 0 to 1024 ====================================================== WARNING: possible circular locking dependency detected 5.15.173-syzkaller #0 Not tainted ------------------------------------------------------ syz.6.340/5729 is trying to acquire lock: ffff0000dff75238 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x830/0x1a44 fs/ext4/inode.c:665 but task is already holding lock: ffff0000d8368208 (&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_process_orphan+0x5c/0x2b8 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x8bc/0x1048 fs/ext4/orphan.c:474 ext4_fill_super+0x8044/0x8768 fs/ext4/super.c:4975 mount_bdev+0x274/0x370 fs/super.c:1400 ext4_mount+0x44/0x58 fs/ext4/super.c:6603 legacy_get_tree+0xd4/0x16c fs/fs_context.c:611 vfs_get_tree+0x90/0x274 fs/super.c:1530 do_new_mount+0x278/0x8fc fs/namespace.c:3012 path_mount+0x594/0x101c fs/namespace.c:3342 do_mount fs/namespace.c:3355 [inline] __do_sys_mount fs/namespace.c:3563 [inline] __se_sys_mount fs/namespace.c:3540 [inline] __arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3540 __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_get_block+0x1c0/0x5c0 fs/ext4/inode.c:815 ext4_get_block+0x4c/0x60 fs/ext4/inode.c:832 ext4_block_write_begin+0x520/0x1130 fs/ext4/inode.c:1100 ext4_write_begin+0x5e4/0xe84 ext4_da_write_begin+0x3b4/0x8e8 fs/ext4/inode.c:2974 generic_perform_write+0x24c/0x520 mm/filemap.c:3785 ext4_buffered_write_iter+0x3fc/0x528 fs/ext4/file.c:268 ext4_file_write_iter+0x684/0x1618 do_iter_readv_writev+0x420/0x5f8 do_iter_write+0x1b8/0x66c fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_pwritev+0x1ec/0x334 fs/read_write.c:1025 __do_sys_pwritev2 fs/read_write.c:1084 [inline] __se_sys_pwritev2 fs/read_write.c:1075 [inline] __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1075 __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_write+0xbc/0x12c kernel/locking/rwsem.c:1551 ext4_map_blocks+0x830/0x1a44 fs/ext4/inode.c:665 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] find_free_dqentry fs/quota/quota_tree.c:307 [inline] do_insert_tree+0xad0/0x14cc fs/quota/quota_tree.c:364 do_insert_tree+0x4b8/0x14cc fs/quota/quota_tree.c:366 do_insert_tree+0x4b8/0x14cc fs/quota/quota_tree.c:366 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_process_orphan+0x5c/0x2b8 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x8bc/0x1048 fs/ext4/orphan.c:474 ext4_fill_super+0x8044/0x8768 fs/ext4/super.c:4975 mount_bdev+0x274/0x370 fs/super.c:1400 ext4_mount+0x44/0x58 fs/ext4/super.c:6603 legacy_get_tree+0xd4/0x16c fs/fs_context.c:611 vfs_get_tree+0x90/0x274 fs/super.c:1530 do_new_mount+0x278/0x8fc fs/namespace.c:3012 path_mount+0x594/0x101c fs/namespace.c:3342 do_mount fs/namespace.c:3355 [inline] __do_sys_mount fs/namespace.c:3563 [inline] __se_sys_mount fs/namespace.c:3540 [inline] __arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3540 __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 *** 3 locks held by syz.6.340/5729: #0: ffff0000d83680e0 (&type->s_umount_key#26/1){+.+.}-{3:3}, at: alloc_super+0x1b8/0x844 fs/super.c:229 #1: ffff0000e68a05e8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x68/0x5e4 fs/quota/dquot.c:460 #2: ffff0000d8368208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x11c/0x188 fs/quota/quota_v2.c:354 stack backtrace: CPU: 0 PID: 5729 Comm: syz.6.340 Not tainted 5.15.173-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 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_write+0xbc/0x12c kernel/locking/rwsem.c:1551 ext4_map_blocks+0x830/0x1a44 fs/ext4/inode.c:665 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] find_free_dqentry fs/quota/quota_tree.c:307 [inline] do_insert_tree+0xad0/0x14cc fs/quota/quota_tree.c:364 do_insert_tree+0x4b8/0x14cc fs/quota/quota_tree.c:366 do_insert_tree+0x4b8/0x14cc fs/quota/quota_tree.c:366 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_process_orphan+0x5c/0x2b8 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x8bc/0x1048 fs/ext4/orphan.c:474 ext4_fill_super+0x8044/0x8768 fs/ext4/super.c:4975 mount_bdev+0x274/0x370 fs/super.c:1400 ext4_mount+0x44/0x58 fs/ext4/super.c:6603 legacy_get_tree+0xd4/0x16c fs/fs_context.c:611 vfs_get_tree+0x90/0x274 fs/super.c:1530 do_new_mount+0x278/0x8fc fs/namespace.c:3012 path_mount+0x594/0x101c fs/namespace.c:3342 do_mount fs/namespace.c:3355 [inline] __do_sys_mount fs/namespace.c:3563 [inline] __se_sys_mount fs/namespace.c:3540 [inline] __arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3540 __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 EXT4-fs error (device loop6): ext4_read_block_bitmap_nowait:476: comm syz.6.340: Invalid block bitmap block 0 in block_group 0 Quota error (device loop6): write_blk: dquota write failed Quota error (device loop6): qtree_write_dquot: Error -117 occurred while creating quota EXT4-fs error (device loop6): ext4_acquire_dquot:6197: comm syz.6.340: Failed to acquire dquot type 0 EXT4-fs error (device loop6): ext4_free_blocks:6223: comm syz.6.340: Freeing blocks not in datazone - block = 0, count = 4096 EXT4-fs error (device loop6): ext4_read_inode_bitmap:140: comm syz.6.340: Invalid inode bitmap blk 0 in block_group 0 EXT4-fs error (device loop6) in ext4_free_inode:362: Corrupt filesystem EXT4-fs (loop6): 1 orphan inode deleted EXT4-fs (loop6): mounted filesystem without journal. Opts: ; ,errors=continue. Quota mode: writeback. EXT4-fs error (device loop6): ext4_search_dir:1549: inode #2: block 16: comm syz.6.340: bad entry in directory: inode out of bounds - offset=44, inode=40, rec_len=16, size=1024 fake=0