====================================================== WARNING: possible circular locking dependency detected 5.15.175-syzkaller #0 Not tainted ------------------------------------------------------ syz.5.111/4917 is trying to acquire lock: ffff88801e269d28 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0x91/0x110 mm/memory.c:5354 but task is already holding lock: ffff88805e8514a0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_fiemap+0x36f/0xf80 fs/ocfs2/extent_map.c:755 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_read_virt_blocks+0x2b3/0xa10 fs/ocfs2/extent_map.c:976 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x437/0x26d0 fs/ocfs2/dir.c:1080 ocfs2_find_files_on_disk+0xea/0x310 fs/ocfs2/dir.c:1982 ocfs2_lookup_ino_from_name+0xad/0x1e0 fs/ocfs2/dir.c:2004 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x314/0x7b0 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x328/0x720 fs/ocfs2/super.c:458 ocfs2_initialize_super fs/ocfs2/super.c:2276 [inline] ocfs2_fill_super+0x47b3/0x5890 fs/ocfs2/super.c:995 mount_bdev+0x2c9/0x3f0 fs/super.c:1400 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x2ba/0xb40 fs/namespace.c:3012 do_mount fs/namespace.c:3355 [inline] __do_sys_mount fs/namespace.c:3563 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540 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 -> #3 (&osb->system_file_mutex){+.+.}-{3:3}: 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 ocfs2_get_system_file_inode+0x1a1/0x7b0 fs/ocfs2/sysfile.c:101 ocfs2_reserve_local_alloc_bits+0x103/0x27a0 fs/ocfs2/localalloc.c:626 ocfs2_reserve_clusters_with_limit+0x1b4/0xb50 fs/ocfs2/suballoc.c:1162 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1223 [inline] ocfs2_lock_allocators+0x306/0x620 fs/ocfs2/suballoc.c:2669 ocfs2_write_begin_nolock+0x28e5/0x4d20 fs/ocfs2/aops.c:1741 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:93 [inline] ocfs2_page_mkwrite+0x65f/0xbd0 fs/ocfs2/mmap.c:144 do_page_mkwrite+0x1a9/0x440 mm/memory.c:2920 do_shared_fault mm/memory.c:4326 [inline] do_fault mm/memory.c:4394 [inline] handle_pte_fault mm/memory.c:4648 [inline] __handle_mm_fault mm/memory.c:4783 [inline] handle_mm_fault+0x2803/0x5960 mm/memory.c:4881 do_user_addr_fault arch/x86/mm/fault.c:1357 [inline] handle_page_fault arch/x86/mm/fault.c:1445 [inline] exc_page_fault+0x271/0x700 arch/x86/mm/fault.c:1501 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 -> #2 (&oi->ip_alloc_sem){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 ocfs2_page_mkwrite+0x301/0xbd0 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x1a9/0x440 mm/memory.c:2920 do_shared_fault mm/memory.c:4326 [inline] do_fault mm/memory.c:4394 [inline] handle_pte_fault mm/memory.c:4648 [inline] __handle_mm_fault mm/memory.c:4783 [inline] handle_mm_fault+0x2803/0x5960 mm/memory.c:4881 do_user_addr_fault arch/x86/mm/fault.c:1357 [inline] handle_page_fault arch/x86/mm/fault.c:1445 [inline] exc_page_fault+0x271/0x700 arch/x86/mm/fault.c:1501 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 -> #1 (sb_pagefaults#2){.+.+}-{0:0}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1813 [inline] sb_start_pagefault include/linux/fs.h:1912 [inline] ocfs2_page_mkwrite+0x1d9/0xbd0 fs/ocfs2/mmap.c:122 do_page_mkwrite+0x1a9/0x440 mm/memory.c:2920 do_shared_fault mm/memory.c:4326 [inline] do_fault mm/memory.c:4394 [inline] handle_pte_fault mm/memory.c:4648 [inline] __handle_mm_fault mm/memory.c:4783 [inline] handle_mm_fault+0x2803/0x5960 mm/memory.c:4881 do_user_addr_fault arch/x86/mm/fault.c:1357 [inline] handle_page_fault arch/x86/mm/fault.c:1445 [inline] exc_page_fault+0x271/0x700 arch/x86/mm/fault.c:1501 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 -> #0 (&mm->mmap_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 __might_fault+0xb4/0x110 mm/memory.c:5355 _copy_to_user+0x28/0x130 lib/usercopy.c:35 copy_to_user include/linux/uaccess.h:200 [inline] fiemap_fill_next_extent+0x231/0x410 fs/ioctl.c:144 ocfs2_fiemap_inline fs/ocfs2/extent_map.c:725 [inline] ocfs2_fiemap+0xc1d/0xf80 fs/ocfs2/extent_map.c:762 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x1934/0x2b70 fs/ioctl.c:814 __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: &mm->mmap_lock --> &osb->system_file_mutex --> &ocfs2_file_ip_alloc_sem_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_file_ip_alloc_sem_key); lock(&osb->system_file_mutex); lock(&ocfs2_file_ip_alloc_sem_key); lock(&mm->mmap_lock); *** DEADLOCK *** 1 lock held by syz.5.111/4917: #0: ffff88805e8514a0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_fiemap+0x36f/0xf80 fs/ocfs2/extent_map.c:755 stack backtrace: CPU: 1 PID: 4917 Comm: syz.5.111 Not tainted 5.15.175-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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 __might_fault+0xb4/0x110 mm/memory.c:5355 _copy_to_user+0x28/0x130 lib/usercopy.c:35 copy_to_user include/linux/uaccess.h:200 [inline] fiemap_fill_next_extent+0x231/0x410 fs/ioctl.c:144 ocfs2_fiemap_inline fs/ocfs2/extent_map.c:725 [inline] ocfs2_fiemap+0xc1d/0xf80 fs/ocfs2/extent_map.c:762 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x1934/0x2b70 fs/ioctl.c:814 __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: 0033:0x7f95bb726d29 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:00007f95b9597038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f95bb916fa0 RCX: 00007f95bb726d29 RDX: 00000000200003c0 RSI: 00000000c020660b RDI: 0000000000000007 RBP: 00007f95bb7a2b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f95bb916fa0 R15: 00007ffda22d91a8