====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.0.6703/3231 is trying to acquire lock: ffff888020afe540 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:400 but task is already holding lock: ffff888035a41630 (&type->i_mutex_dir_key#5){++++}-{4:4}, at: iterate_dir+0x292/0x570 fs/readdir.c:101 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&type->i_mutex_dir_key#5){++++}-{4:4}: down_read+0x47/0x2e0 kernel/locking/rwsem.c:1537 inode_lock_shared include/linux/fs.h:1042 [inline] lookup_slow+0x46/0x70 fs/namei.c:1874 walk_component fs/namei.c:2221 [inline] lookup_last fs/namei.c:2722 [inline] path_lookupat+0x3f5/0x8c0 fs/namei.c:2746 filename_lookup+0x212/0x570 fs/namei.c:2775 kern_path+0x35/0x50 fs/namei.c:2987 is_same_device fs/btrfs/volumes.c:759 [inline] device_list_add+0xe21/0x22b0 fs/btrfs/volumes.c:893 btrfs_scan_one_device+0x3ef/0x680 fs/btrfs/volumes.c:1492 btrfs_get_tree_super fs/btrfs/super.c:1860 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline] btrfs_get_tree+0x4ab/0x1920 fs/btrfs/super.c:2123 vfs_get_tree+0x92/0x2a0 fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3712 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (&fs_devs->device_list_mutex){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x187/0x1350 kernel/locking/mutex.c:776 insert_dev_extents fs/btrfs/block-group.c:2748 [inline] btrfs_create_pending_block_groups+0x5f8/0x1760 fs/btrfs/block-group.c:2799 __btrfs_end_transaction+0x140/0x640 fs/btrfs/transaction.c:1078 flush_space+0x360/0xd20 fs/btrfs/space-info.c:898 do_async_reclaim_metadata_space+0x11e/0x350 fs/btrfs/space-info.c:1185 btrfs_async_reclaim_metadata_space+0x89/0xe0 fs/btrfs/space-info.c:1252 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 -> #2 (btrfs_trans_num_extwriters){++++}-{0:0}: join_transaction+0x1a4/0xd60 fs/btrfs/transaction.c:323 start_transaction+0x6b7/0x15f0 fs/btrfs/transaction.c:707 btrfs_rebuild_free_space_tree+0xad/0x6c0 fs/btrfs/free-space-tree.c:1330 btrfs_start_pre_rw_mount+0x128f/0x1bf0 fs/btrfs/disk-io.c:3052 open_ctree+0x2b11/0x3d20 fs/btrfs/disk-io.c:3603 btrfs_fill_super fs/btrfs/super.c:983 [inline] btrfs_get_tree_super fs/btrfs/super.c:1946 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline] btrfs_get_tree+0x1061/0x1920 fs/btrfs/super.c:2123 vfs_get_tree+0x92/0x2a0 fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3712 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (btrfs_trans_num_writers){++++}-{0:0}: __lock_release kernel/locking/lockdep.c:5574 [inline] lock_release+0x19a/0x3b0 kernel/locking/lockdep.c:5889 percpu_up_read include/linux/percpu-rwsem.h:112 [inline] __sb_end_write include/linux/fs/super.h:14 [inline] sb_end_intwrite+0x26/0x1c0 include/linux/fs/super.h:101 __btrfs_end_transaction+0x248/0x640 fs/btrfs/transaction.c:1083 btrfs_dirty_inode+0x14c/0x190 fs/btrfs/inode.c:6338 inode_update_time fs/inode.c:2167 [inline] touch_atime+0x2f9/0x6d0 fs/inode.c:2240 file_accessed include/linux/fs.h:2254 [inline] btrfs_file_mmap_prepare+0x176/0x1f0 fs/btrfs/file.c:2053 vfs_mmap_prepare include/linux/fs.h:2058 [inline] call_mmap_prepare mm/vma.c:2596 [inline] __mmap_region mm/vma.c:2692 [inline] mmap_region+0xb2b/0x1d10 mm/vma.c:2786 do_mmap+0xc45/0x10d0 mm/mmap.c:558 vm_mmap_pgoff+0x2a6/0x4d0 mm/util.c:581 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:604 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&mm->mmap_lock){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868 down_read_killable+0x50/0x350 kernel/locking/rwsem.c:1560 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:400 get_mmap_lock_carefully mm/mmap_lock.c:399 [inline] lock_mm_and_find_vma+0x2a8/0x300 mm/mmap_lock.c:450 do_user_addr_fault+0x331/0x1380 arch/x86/mm/fault.c:1359 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x71/0xd0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 user_access_begin arch/x86/include/asm/uaccess.h:-1 [inline] filldir+0x29c/0x6c0 fs/readdir.c:290 dir_emit_dot include/linux/fs.h:3531 [inline] dir_emit_dots include/linux/fs.h:3542 [inline] offset_readdir+0x1e6/0x560 fs/libfs.c:561 iterate_dir+0x399/0x570 fs/readdir.c:108 __do_sys_getdents fs/readdir.c:326 [inline] __se_sys_getdents+0xe4/0x250 fs/readdir.c:312 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 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: &mm->mmap_lock --> &fs_devs->device_list_mutex --> &type->i_mutex_dir_key#5 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&type->i_mutex_dir_key#5); lock(&fs_devs->device_list_mutex); lock(&type->i_mutex_dir_key#5); rlock(&mm->mmap_lock); *** DEADLOCK *** 2 locks held by syz.0.6703/3231: #0: ffff888049e455f8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1255 #1: ffff888035a41630 (&type->i_mutex_dir_key#5){++++}-{4:4}, at: iterate_dir+0x292/0x570 fs/readdir.c:101 stack backtrace: CPU: 0 UID: 0 PID: 3231 Comm: syz.0.6703 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a6/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868 down_read_killable+0x50/0x350 kernel/locking/rwsem.c:1560 mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:400 get_mmap_lock_carefully mm/mmap_lock.c:399 [inline] lock_mm_and_find_vma+0x2a8/0x300 mm/mmap_lock.c:450 do_user_addr_fault+0x331/0x1380 arch/x86/mm/fault.c:1359 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x71/0xd0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0010:filldir+0x29c/0x6c0 fs/readdir.c:294 Code: 82 ff 4c 89 ff 4c 89 e6 e8 31 bf 82 ff 4d 39 e7 0f 82 7c 02 00 00 49 39 ef 0f 87 73 02 00 00 0f 01 cb 0f ae e8 48 8b 44 24 50 <49> 89 44 24 08 48 8b 4c 24 08 48 8b 44 24 58 48 89 01 48 8b 04 24 RSP: 0018:ffffc9000bb97c90 EFLAGS: 00050287 RAX: 0000000000000000 RBX: ffffc9000bb97e38 RCX: ffff888025e79e80 RDX: 0000000000000000 RSI: 0000200000001fc0 RDI: 0000200000001fd8 RBP: 00007ffffffff000 R08: 0000000000000222 R09: 0000000000000004 R10: 000000007fffffff R11: ffffffff823e3870 R12: 0000200000001fc0 R13: ffffffff8b7a2260 R14: 0000000000000001 R15: 0000200000001fd8 dir_emit_dot include/linux/fs.h:3531 [inline] dir_emit_dots include/linux/fs.h:3542 [inline] offset_readdir+0x1e6/0x560 fs/libfs.c:561 iterate_dir+0x399/0x570 fs/readdir.c:108 __do_sys_getdents fs/readdir.c:326 [inline] __se_sys_getdents+0xe4/0x250 fs/readdir.c:312 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f989c98f749 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:00007f989d8d9038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00007f989cbe5fa0 RCX: 00007f989c98f749 RDX: 00000000000000b8 RSI: 0000200000001fc0 RDI: 0000000000000003 RBP: 00007f989ca13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f989cbe6038 R14: 00007f989cbe5fa0 R15: 00007ffeca0357c8 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ff 4c 89 ff decl -0x1(%rcx,%rcx,4) 4: 4c 89 e6 mov %r12,%rsi 7: e8 31 bf 82 ff call 0xff82bf3d c: 4d 39 e7 cmp %r12,%r15 f: 0f 82 7c 02 00 00 jb 0x291 15: 49 39 ef cmp %rbp,%r15 18: 0f 87 73 02 00 00 ja 0x291 1e: 0f 01 cb stac 21: 0f ae e8 lfence 24: 48 8b 44 24 50 mov 0x50(%rsp),%rax * 29: 49 89 44 24 08 mov %rax,0x8(%r12) <-- trapping instruction 2e: 48 8b 4c 24 08 mov 0x8(%rsp),%rcx 33: 48 8b 44 24 58 mov 0x58(%rsp),%rax 38: 48 89 01 mov %rax,(%rcx) 3b: 48 8b 04 24 mov (%rsp),%rax