EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: writeback. ext4 filesystem being mounted at /root/syzkaller-testdir3153162823/syzkaller.casHlY/1297/file0 supports timestamps until 2038 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 5.15.102-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/30021 is trying to acquire lock: ffff888053c03e48 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x9e0/0x1e30 fs/ext4/inode.c:638 but task is already holding lock: ffff88807de2a208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x9b/0x190 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}: lock_acquire+0x1ff/0x570 kernel/locking/lockdep.c:5622 down_read+0x3b/0x50 kernel/locking/rwsem.c:1488 v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332 dquot_acquire+0x188/0x680 fs/quota/dquot.c:435 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6163 dqget+0x98b/0xdb0 fs/quota/dquot.c:914 __dquot_initialize+0x2d9/0xe10 fs/quota/dquot.c:1492 ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0xa0d/0x1290 fs/ext4/orphan.c:474 ext4_fill_super+0x9757/0x9f70 fs/ext4/super.c:4964 mount_bdev+0x26d/0x3a0 fs/super.c:1369 legacy_get_tree+0xeb/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1499 do_new_mount+0x28b/0xad0 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 -> #1 (&dquot->dq_lock){+.+.}-{3:3}: lock_acquire+0x1ff/0x570 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:479 ext4_write_dquot+0x1e8/0x2b0 fs/ext4/super.c:6147 mark_dquot_dirty fs/quota/dquot.c:346 [inline] mark_all_dquot_dirty fs/quota/dquot.c:384 [inline] __dquot_alloc_space+0x53a/0xf30 fs/quota/dquot.c:1722 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+0x1372/0x5120 fs/ext4/mballoc.c:5585 ext4_ext_map_blocks+0x1b1c/0x76a0 fs/ext4/extents.c:4287 ext4_map_blocks+0xaad/0x1e30 fs/ext4/inode.c:645 _ext4_get_block+0x23b/0x660 fs/ext4/inode.c:802 ext4_block_write_begin+0x6b0/0x13a0 fs/ext4/inode.c:1087 ext4_write_begin+0x75f/0x1700 generic_perform_write+0x2bf/0x5b0 mm/filemap.c:3776 ext4_buffered_write_iter+0x22e/0x380 fs/ext4/file.c:269 ext4_file_write_iter+0x87c/0x1990 call_write_iter include/linux/fs.h:2101 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacf/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 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+0x1ff/0x570 kernel/locking/lockdep.c:5622 down_write+0x97/0x170 kernel/locking/rwsem.c:1541 ext4_map_blocks+0x9e0/0x1e30 fs/ext4/inode.c:638 ext4_getblk+0x19f/0x710 fs/ext4/inode.c:856 ext4_bread+0x2a/0x170 fs/ext4/inode.c:909 ext4_quota_write+0x21e/0x580 fs/ext4/super.c:6529 write_blk fs/quota/quota_tree.c:64 [inline] find_free_dqentry fs/quota/quota_tree.c:307 [inline] do_insert_tree+0xf5a/0x1c20 fs/quota/quota_tree.c:364 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 dq_insert_tree fs/quota/quota_tree.c:392 [inline] qtree_write_dquot+0x3b9/0x530 fs/quota/quota_tree.c:411 v2_write_dquot+0x11c/0x190 fs/quota/quota_v2.c:358 dquot_acquire+0x34d/0x680 fs/quota/dquot.c:444 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6163 dqget+0x98b/0xdb0 fs/quota/dquot.c:914 __dquot_initialize+0x45e/0xe10 fs/quota/dquot.c:1492 ext4_create+0xb1/0x550 fs/ext4/namei.c:2802 lookup_open fs/namei.c:3334 [inline] open_last_lookups fs/namei.c:3404 [inline] path_openat+0x12c0/0x2ee0 fs/namei.c:3612 do_filp_open+0x21c/0x460 fs/namei.c:3642 do_sys_openat2+0x13b/0x500 fs/open.c:1211 do_sys_open fs/open.c:1227 [inline] __do_sys_open fs/open.c:1235 [inline] __se_sys_open fs/open.c:1231 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1231 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 *** 4 locks held by syz-executor.3/30021: #0: ffff88807de2a460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377 #1: ffff888053c067a0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff888053c067a0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: open_last_lookups fs/namei.c:3401 [inline] #1: ffff888053c067a0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: path_openat+0x818/0x2ee0 fs/namei.c:3612 #2: ffff88804dc63768 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x64/0x680 fs/quota/dquot.c:432 #3: ffff88807de2a208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x9b/0x190 fs/quota/quota_v2.c:354 stack backtrace: CPU: 1 PID: 30021 Comm: syz-executor.3 Not tainted 5.15.102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 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+0x1ff/0x570 kernel/locking/lockdep.c:5622 down_write+0x97/0x170 kernel/locking/rwsem.c:1541 ext4_map_blocks+0x9e0/0x1e30 fs/ext4/inode.c:638 ext4_getblk+0x19f/0x710 fs/ext4/inode.c:856 ext4_bread+0x2a/0x170 fs/ext4/inode.c:909 ext4_quota_write+0x21e/0x580 fs/ext4/super.c:6529 write_blk fs/quota/quota_tree.c:64 [inline] find_free_dqentry fs/quota/quota_tree.c:307 [inline] do_insert_tree+0xf5a/0x1c20 fs/quota/quota_tree.c:364 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 dq_insert_tree fs/quota/quota_tree.c:392 [inline] qtree_write_dquot+0x3b9/0x530 fs/quota/quota_tree.c:411 v2_write_dquot+0x11c/0x190 fs/quota/quota_v2.c:358 dquot_acquire+0x34d/0x680 fs/quota/dquot.c:444 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6163 dqget+0x98b/0xdb0 fs/quota/dquot.c:914 __dquot_initialize+0x45e/0xe10 fs/quota/dquot.c:1492 ext4_create+0xb1/0x550 fs/ext4/namei.c:2802 lookup_open fs/namei.c:3334 [inline] open_last_lookups fs/namei.c:3404 [inline] path_openat+0x12c0/0x2ee0 fs/namei.c:3612 do_filp_open+0x21c/0x460 fs/namei.c:3642 do_sys_openat2+0x13b/0x500 fs/open.c:1211 do_sys_open fs/open.c:1227 [inline] __do_sys_open fs/open.c:1235 [inline] __se_sys_open fs/open.c:1231 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1231 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: 0033:0x7f70c90540f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f70c75c6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f70c9173f80 RCX: 00007f70c90540f9 RDX: 0000000000000000 RSI: 000000000014937e RDI: 0000000020000180 RBP: 00007f70c90afb39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc3b683adf R14: 00007f70c75c6300 R15: 0000000000022000