====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc4-syzkaller-00013-g66701750d556 #0 Not tainted ------------------------------------------------------ syz-executor/10578 is trying to acquire lock: ffff88804e7fd6d8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ffff88804e7fd6d8 (&ei->xattr_sem){++++}-{4:4}, at: ext4_inline_data_truncate+0x1a9/0xad0 fs/ext4/inline.c:1872 but task is already holding lock: ffff88802a052618 (sb_internal){++++}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] ffff88802a052618 (sb_internal){++++}-{0:0}, at: __sb_start_write include/linux/fs.h:1795 [inline] ffff88802a052618 (sb_internal){++++}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1978 [inline] ffff88802a052618 (sb_internal){++++}-{0:0}, at: ext4_evict_inode+0x2d6/0xee0 fs/ext4/inode.c:215 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (sb_internal){++++}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 percpu_down_write+0x54/0x330 kernel/locking/percpu-rwsem.c:232 sb_wait_write fs/super.c:1900 [inline] freeze_super+0x8b7/0x1130 fs/super.c:2183 fs_bdev_freeze+0x1a3/0x310 fs/super.c:1529 bdev_freeze+0xd8/0x220 block/bdev.c:298 ext4_force_shutdown+0x322/0x560 fs/ext4/ioctl.c:822 ext4_ioctl_shutdown fs/ext4/ioctl.c:857 [inline] __ext4_ioctl fs/ext4/ioctl.c:1587 [inline] ext4_ioctl+0x1d39/0x3510 fs/ext4/ioctl.c:1626 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #4 (sb_pagefaults){++++}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 percpu_down_read_internal+0x48/0x1c0 include/linux/percpu-rwsem.h:53 percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] __sb_start_write include/linux/fs.h:1795 [inline] sb_start_pagefault include/linux/fs.h:1960 [inline] ext4_page_mkwrite+0x1e3/0x1110 fs/ext4/inode.c:6576 do_page_mkwrite+0x14d/0x310 mm/memory.c:3378 do_shared_fault mm/memory.c:5666 [inline] do_fault mm/memory.c:5728 [inline] do_pte_missing mm/memory.c:4251 [inline] handle_pte_fault mm/memory.c:6069 [inline] __handle_mm_fault+0x1a60/0x5620 mm/memory.c:6212 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6381 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #3 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __might_fault+0xcc/0x130 mm/memory.c:6971 _inline_copy_to_user include/linux/uaccess.h:192 [inline] _copy_to_user+0x2c/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] fiemap_fill_next_extent+0x1c0/0x390 fs/ioctl.c:145 ocfs2_fiemap+0x888/0xc90 fs/ocfs2/extent_map.c:806 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x16d3/0x1990 fs/ioctl.c:841 __do_sys_ioctl fs/ioctl.c:905 [inline] __se_sys_ioctl+0x82/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 ocfs2_create_local_dquot+0x19d/0x1a40 fs/ocfs2/quota_local.c:1227 ocfs2_acquire_dquot+0x80f/0xb30 fs/ocfs2/quota_global.c:883 dqget+0x7b1/0xf10 fs/quota/dquot.c:977 ocfs2_setattr+0xd72/0x1b40 fs/ocfs2/file.c:1233 notify_change+0xb36/0xe40 fs/attr.c:552 chown_common+0x40c/0x5c0 fs/open.c:790 vfs_fchown fs/open.c:858 [inline] ksys_fchown+0xea/0x160 fs/open.c:870 __do_sys_fchown fs/open.c:875 [inline] __se_sys_fchown fs/open.c:873 [inline] __x64_sys_fchown+0x7a/0x90 fs/open.c:873 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&dquot->dq_lock){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747 wait_on_dquot fs/quota/dquot.c:354 [inline] dqget+0x72a/0xf10 fs/quota/dquot.c:972 dquot_transfer+0x2f8/0x6d0 fs/quota/dquot.c:2140 ext4_setattr+0x865/0x1bc0 fs/ext4/inode.c:5817 notify_change+0xb36/0xe40 fs/attr.c:552 chown_common+0x40c/0x5c0 fs/open.c:790 do_fchownat+0x161/0x270 fs/open.c:821 __do_sys_lchown fs/open.c:846 [inline] __se_sys_lchown fs/open.c:844 [inline] __x64_sys_lchown+0x85/0xa0 fs/open.c:844 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ei->xattr_sem){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ext4_inline_data_truncate+0x1a9/0xad0 fs/ext4/inline.c:1872 ext4_truncate+0x3b5/0x1100 fs/ext4/inode.c:4528 ext4_evict_inode+0x8cf/0xee0 fs/ext4/inode.c:261 evict+0x504/0x9c0 fs/inode.c:810 d_delete_notify include/linux/fsnotify.h:402 [inline] vfs_rmdir+0x3ec/0x520 fs/namei.c:4483 do_rmdir+0x2ac/0x630 fs/namei.c:4525 __do_sys_unlinkat fs/namei.c:4699 [inline] __se_sys_unlinkat fs/namei.c:4693 [inline] __x64_sys_unlinkat+0xc2/0xf0 fs/namei.c:4693 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &ei->xattr_sem --> sb_pagefaults --> sb_internal Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_internal); lock(sb_pagefaults); lock(sb_internal); lock(&ei->xattr_sem); *** DEADLOCK *** 3 locks held by syz-executor/10578: #0: ffff88802a052428 (sb_writers#4){++++}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff88804e41bd40 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #1: ffff88804e41bd40 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: do_rmdir+0x1b2/0x630 fs/namei.c:4517 #2: ffff88802a052618 (sb_internal){++++}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] #2: ffff88802a052618 (sb_internal){++++}-{0:0}, at: __sb_start_write include/linux/fs.h:1795 [inline] #2: ffff88802a052618 (sb_internal){++++}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1978 [inline] #2: ffff88802a052618 (sb_internal){++++}-{0:0}, at: ext4_evict_inode+0x2d6/0xee0 fs/ext4/inode.c:215 stack backtrace: CPU: 0 UID: 0 PID: 10578 Comm: syz-executor Not tainted 6.16.0-rc4-syzkaller-00013-g66701750d556 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2046 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ext4_inline_data_truncate+0x1a9/0xad0 fs/ext4/inline.c:1872 ext4_truncate+0x3b5/0x1100 fs/ext4/inode.c:4528 ext4_evict_inode+0x8cf/0xee0 fs/ext4/inode.c:261 evict+0x504/0x9c0 fs/inode.c:810 d_delete_notify include/linux/fsnotify.h:402 [inline] vfs_rmdir+0x3ec/0x520 fs/namei.c:4483 do_rmdir+0x2ac/0x630 fs/namei.c:4525 __do_sys_unlinkat fs/namei.c:4699 [inline] __se_sys_unlinkat fs/namei.c:4693 [inline] __x64_sys_unlinkat+0xc2/0xf0 fs/namei.c:4693 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdbbc18df07 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 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:00007ffc2bafec38 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fdbbc18df07 RDX: 0000000000000200 RSI: 00007ffc2baffde0 RDI: 00000000ffffff9c RBP: 00007fdbbc210925 R08: 0000555592b2166b R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000207 R12: 00007ffc2baffde0 R13: 00007fdbbc210925 R14: 000000000007dbb3 R15: 00007ffc2bb01fa0 EXT4-fs (loop8): unmounting filesystem 00000000-0000-0000-0000-000000000000.