loop4: detected capacity change from 0 to 512 EXT4-fs (loop4): Ignoring removed bh option EXT4-fs (loop4): feature flags set on rev 0 fs, running e2fsck is recommended ====================================================== WARNING: possible circular locking dependency detected 5.15.138-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/9406 is trying to acquire lock: ffff88808687dc30 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x3a6/0x1e00 fs/ext4/inode.c:568 but task is already holding lock: ffff88803a0c2208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1488 v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332 dquot_acquire+0x188/0x680 fs/quota/dquot.c:461 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6180 dqget+0x74e/0xe30 fs/quota/dquot.c:984 __dquot_initialize+0x2d9/0xe10 fs/quota/dquot.c:1562 ext4_create+0xb1/0x550 fs/ext4/namei.c:2827 lookup_open fs/namei.c:3392 [inline] open_last_lookups fs/namei.c:3462 [inline] path_openat+0x12f6/0x2f20 fs/namei.c:3669 do_filp_open+0x21c/0x460 fs/namei.c:3699 do_sys_openat2+0x13b/0x500 fs/open.c:1211 do_sys_open fs/open.c:1227 [inline] __do_sys_openat fs/open.c:1243 [inline] __se_sys_openat fs/open.c:1238 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1238 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #1 (&dquot->dq_lock){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __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:505 ext4_write_dquot+0x1e8/0x2b0 fs/ext4/super.c:6164 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty fs/quota/dquot.c:410 [inline] __dquot_alloc_space+0x53a/0xf30 fs/quota/dquot.c:1792 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+0x12bb/0x4d50 fs/ext4/mballoc.c:5640 ext4_ext_map_blocks+0x1986/0x7220 fs/ext4/extents.c:4287 ext4_map_blocks+0xaad/0x1e00 fs/ext4/inode.c:645 ext4_getblk+0x19f/0x710 fs/ext4/inode.c:846 ext4_bread+0x2a/0x170 fs/ext4/inode.c:899 ext4_append+0x31f/0x5c0 fs/ext4/namei.c:83 ext4_init_new_dir+0x33a/0xa20 fs/ext4/namei.c:2981 ext4_mkdir+0x4f2/0xce0 fs/ext4/namei.c:3027 vfs_mkdir+0x419/0x640 fs/namei.c:3994 do_mkdirat+0x260/0x520 fs/namei.c:4019 __do_sys_mkdirat fs/namei.c:4034 [inline] __se_sys_mkdirat fs/namei.c:4032 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4032 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #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+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1488 ext4_map_blocks+0x3a6/0x1e00 fs/ext4/inode.c:568 ext4_getblk+0x19f/0x710 fs/ext4/inode.c:846 ext4_bread+0x2a/0x170 fs/ext4/inode.c:899 ext4_quota_read+0x1a1/0x2c0 fs/ext4/super.c:6500 read_blk fs/quota/quota_tree.c:55 [inline] find_tree_dqentry+0x192/0xb60 fs/quota/quota_tree.c:617 find_tree_dqentry+0x41a/0xb60 fs/quota/quota_tree.c:635 find_dqentry fs/quota/quota_tree.c:647 [inline] qtree_read_dquot+0x13f/0x650 fs/quota/quota_tree.c:667 v2_read_dquot+0xbe/0x100 fs/quota/quota_v2.c:333 dquot_acquire+0x188/0x680 fs/quota/dquot.c:461 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6180 dqget+0x74e/0xe30 fs/quota/dquot.c:984 __dquot_initialize+0x2d9/0xe10 fs/quota/dquot.c:1562 ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474 ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4966 mount_bdev+0x2c9/0x3f0 fs/super.c:1387 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1517 do_new_mount+0x28b/0xae0 fs/namespace.c:2994 do_mount fs/namespace.c:3337 [inline] __do_sys_mount fs/namespace.c:3545 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3522 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb 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-executor.4/9406: #0: ffff88803a0c20e0 (&type->s_umount_key#28/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229 #1: ffff88803c0b3ca8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x64/0x680 fs/quota/dquot.c:458 #2: ffff88803a0c2208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332 stack backtrace: CPU: 1 PID: 9406 Comm: syz-executor.4 Not tainted 5.15.138-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb 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+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1488 ext4_map_blocks+0x3a6/0x1e00 fs/ext4/inode.c:568 ext4_getblk+0x19f/0x710 fs/ext4/inode.c:846 ext4_bread+0x2a/0x170 fs/ext4/inode.c:899 ext4_quota_read+0x1a1/0x2c0 fs/ext4/super.c:6500 read_blk fs/quota/quota_tree.c:55 [inline] find_tree_dqentry+0x192/0xb60 fs/quota/quota_tree.c:617 find_tree_dqentry+0x41a/0xb60 fs/quota/quota_tree.c:635 find_dqentry fs/quota/quota_tree.c:647 [inline] qtree_read_dquot+0x13f/0x650 fs/quota/quota_tree.c:667 v2_read_dquot+0xbe/0x100 fs/quota/quota_v2.c:333 dquot_acquire+0x188/0x680 fs/quota/dquot.c:461 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6180 dqget+0x74e/0xe30 fs/quota/dquot.c:984 __dquot_initialize+0x2d9/0xe10 fs/quota/dquot.c:1562 ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474 ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4966 mount_bdev+0x2c9/0x3f0 fs/super.c:1387 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1517 do_new_mount+0x28b/0xae0 fs/namespace.c:2994 do_mount fs/namespace.c:3337 [inline] __do_sys_mount fs/namespace.c:3545 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3522 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f113b4611ea Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f11399e0ee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f11399e0f80 RCX: 00007f113b4611ea RDX: 0000000020000040 RSI: 0000000020000500 RDI: 00007f11399e0f40 RBP: 0000000020000040 R08: 00007f11399e0f80 R09: 000000000001c916 R10: 000000000001c916 R11: 0000000000000202 R12: 0000000020000500 R13: 00007f11399e0f40 R14: 00000000000004d3 R15: 0000000020000080 EXT4-fs (loop4): 1 truncate cleaned up EXT4-fs (loop4): mounted filesystem without journal. Opts: nobarrier,noblock_validity,discard,bh,noinit_itable,resgid=0x000000000000ee01,nombcache,resgid=0x000000000000ee01,resgid=0x000000000000ee002,errors=continue. Quota mode: writeback. EXT4-fs error (device loop4): ext4_mb_mark_diskspace_used:3851: comm syz-executor.4: Allocating blocks 50-51 which overlap fs metadata EXT4-fs (loop4): pa ffff888080118b60: logic 16, phys. 43, len 16 EXT4-fs error (device loop4): ext4_mb_release_inode_pa:4859: group 0, free 8, pa_free 9