EXT4-fs (loop1): mounted filesystem without journal. Opts: nodelalloc,orlov,auto_da_alloc,,errors=continue. Quota mode: writeback. ext4 filesystem being mounted at /186/bus supports timestamps until 2038-01-19 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 5.15.173-syzkaller #0 Not tainted ------------------------------------------------------ syz.1.964/8205 is trying to acquire lock: ffff88805fe7d5a8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x57/0x510 fs/quota/dquot.c:507 but task is already holding lock: ffff888056b65c30 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x9a2/0x1c70 fs/ext4/inode.c:665 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->i_data_sem/2){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 ext4_map_blocks+0x9a2/0x1c70 fs/ext4/inode.c:665 ext4_getblk+0x19f/0x710 fs/ext4/inode.c:869 ext4_bread+0x2a/0x170 fs/ext4/inode.c:922 ext4_quota_write+0x21e/0x580 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+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:472 ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6193 dqget+0x762/0xe90 fs/quota/dquot.c:986 dquot_set_dqblk+0x27/0xf20 fs/quota/dquot.c:2824 quota_setquota+0x6d3/0x840 fs/quota/quota.c:309 __do_sys_quotactl fs/quota/quota.c:959 [inline] __se_sys_quotactl+0x2b1/0x770 fs/quota/quota.c:915 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (&s->s_dquot.dqio_sem){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498 v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332 dquot_acquire+0x188/0x680 fs/quota/dquot.c:463 ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6193 dqget+0x762/0xe90 fs/quota/dquot.c:986 __dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1515 ext4_create+0xb1/0x550 fs/ext4/namei.c:2876 lookup_open fs/namei.c:3462 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x130a/0x2f20 fs/namei.c:3739 do_filp_open+0x21c/0x460 fs/namei.c:3769 file_open_name fs/open.c:1198 [inline] filp_open+0x25d/0x2c0 fs/open.c:1218 do_coredump+0x2549/0x31e0 fs/coredump.c:767 get_signal+0xc06/0x14e0 kernel/signal.c:2886 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:320 exc_page_fault+0x342/0x700 arch/x86/mm/fault.c:1504 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 -> #0 (&dquot->dq_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __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:507 ext4_write_dquot+0x1fd/0x360 fs/ext4/super.c:6173 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0xf7/0x400 fs/quota/dquot.c:412 __dquot_alloc_space+0xdd8/0x1090 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+0x12d8/0x4d60 fs/ext4/mballoc.c:5739 ext4_ext_map_blocks+0x1b01/0x7630 fs/ext4/extents.c:4339 ext4_map_blocks+0xa66/0x1c70 fs/ext4/inode.c:672 ext4_alloc_file_blocks+0x3db/0xce0 fs/ext4/extents.c:4526 ext4_fallocate+0xcf9/0x20f0 fs/ext4/extents.c:4813 vfs_fallocate+0x54a/0x6b0 fs/open.c:308 do_vfs_ioctl+0x2317/0x2b70 fs/ioctl.c:853 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x81/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: &dquot->dq_lock --> &s->s_dquot.dqio_sem --> &ei->i_data_sem/2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->i_data_sem/2); lock(&s->s_dquot.dqio_sem); lock(&ei->i_data_sem/2); lock(&dquot->dq_lock); *** DEADLOCK *** 4 locks held by syz.1.964/8205: #0: ffff888061154460 (sb_writers#5){++++}-{0:0}, at: file_start_write include/linux/fs.h:3044 [inline] #0: ffff888061154460 (sb_writers#5){++++}-{0:0}, at: vfs_fallocate+0x4bd/0x6b0 fs/open.c:307 #1: ffff888056b65da8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline] #1: ffff888056b65da8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: ext4_fallocate+0x28b/0x20f0 fs/ext4/extents.c:4787 #2: ffff888056b65c30 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x9a2/0x1c70 fs/ext4/inode.c:665 #3: ffffffff8ca43c58 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311 stack backtrace: CPU: 1 PID: 8205 Comm: syz.1.964 Not tainted 5.15.173-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 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+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __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:507 ext4_write_dquot+0x1fd/0x360 fs/ext4/super.c:6173 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0xf7/0x400 fs/quota/dquot.c:412 __dquot_alloc_space+0xdd8/0x1090 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+0x12d8/0x4d60 fs/ext4/mballoc.c:5739 ext4_ext_map_blocks+0x1b01/0x7630 fs/ext4/extents.c:4339 ext4_map_blocks+0xa66/0x1c70 fs/ext4/inode.c:672 ext4_alloc_file_blocks+0x3db/0xce0 fs/ext4/extents.c:4526 ext4_fallocate+0xcf9/0x20f0 fs/ext4/extents.c:4813 vfs_fallocate+0x54a/0x6b0 fs/open.c:308 do_vfs_ioctl+0x2317/0x2b70 fs/ioctl.c:853 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x81/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f280e9f5819 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f280c86d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f280ebacfa0 RCX: 00007f280e9f5819 RDX: 0000000020000000 RSI: 0000000040305828 RDI: 0000000000000006 RBP: 00007f280ea6875e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f280ebacfa0 R15: 00007ffe302a06a8