====================================================== WARNING: possible circular locking dependency detected 5.11.0-syzkaller #0 Not tainted ------------------------------------------------------ syz.2.15/4713 is trying to acquire lock: ffff8880158c5488 (&osb->system_file_mutex){+.+.}-{3:3}, at: ocfs2_get_system_file_inode+0x32d/0x6a0 fs/ocfs2/sysfile.c:103 but task is already holding lock: ffff88802c5158e0 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_page_mkwrite+0x250/0xa00 fs/ocfs2/mmap.c:144 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&oi->ip_alloc_sem){++++}-{3:3}: lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1a8/0x730 kernel/locking/lockdep.c:5407 down_write+0x8d/0x150 kernel/locking/rwsem.c:1406 ocfs2_page_mkwrite+0x250/0xa00 fs/ocfs2/mmap.c:144 do_page_mkwrite+0x18b/0x400 mm/memory.c:2714 do_shared_fault mm/memory.c:4083 [inline] do_fault mm/memory.c:4151 [inline] handle_pte_fault mm/memory.c:4387 [inline] __handle_mm_fault mm/memory.c:4522 [inline] handle_mm_fault+0x230a/0x3ba0 mm/memory.c:4620 do_user_addr_fault+0x2d3/0x930 arch/x86/mm/fault.c:1393 handle_page_fault arch/x86/mm/fault.c:1450 [inline] exc_page_fault+0x61/0xc0 arch/x86/mm/fault.c:1506 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:580 -> #3 (sb_pagefaults#2){.+.+}-{0:0}: lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1a8/0x730 kernel/locking/lockdep.c:5407 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1592 [inline] sb_start_pagefault include/linux/fs.h:1691 [inline] ocfs2_page_mkwrite+0x170/0xa00 fs/ocfs2/mmap.c:124 do_page_mkwrite+0x18b/0x400 mm/memory.c:2714 do_shared_fault mm/memory.c:4083 [inline] do_fault mm/memory.c:4151 [inline] handle_pte_fault mm/memory.c:4387 [inline] __handle_mm_fault mm/memory.c:4522 [inline] handle_mm_fault+0x230a/0x3ba0 mm/memory.c:4620 do_user_addr_fault+0x2d3/0x930 arch/x86/mm/fault.c:1393 handle_page_fault arch/x86/mm/fault.c:1450 [inline] exc_page_fault+0x61/0xc0 arch/x86/mm/fault.c:1506 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:580 -> #2 (&mm->mmap_lock#2){++++}-{3:3}: lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1a8/0x730 kernel/locking/lockdep.c:5407 __might_fault mm/memory.c:5019 [inline] __might_fault+0xe8/0x160 mm/memory.c:5004 _copy_to_user+0x20/0xd0 lib/usercopy.c:28 copy_to_user include/linux/uaccess.h:200 [inline] fiemap_fill_next_extent+0x18d/0x320 fs/ioctl.c:141 ocfs2_fiemap_inline fs/ocfs2/extent_map.c:727 [inline] ocfs2_fiemap+0x6b3/0xa60 fs/ocfs2/extent_map.c:764 ioctl_fiemap fs/ioctl.c:216 [inline] do_vfs_ioctl+0x1fd/0xe10 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:751 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0xc5/0x190 fs/ioctl.c:739 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #1 (&ocfs2_file_ip_alloc_sem_key){.+.+}-{3:3}: lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1a8/0x730 kernel/locking/lockdep.c:5407 down_read+0x36/0x50 kernel/locking/rwsem.c:1353 ocfs2_read_virt_blocks+0x1b9/0x710 fs/ocfs2/extent_map.c:978 ocfs2_read_dir_block+0xa7/0x440 fs/ocfs2/dir.c:504 ocfs2_find_entry_el fs/ocfs2/dir.c:711 [inline] ocfs2_find_entry+0x4d8/0xde0 fs/ocfs2/dir.c:1076 ocfs2_find_files_on_disk+0x6c/0x310 fs/ocfs2/dir.c:1975 ocfs2_lookup_ino_from_name+0x87/0xd0 fs/ocfs2/dir.c:1997 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:138 [inline] ocfs2_get_system_file_inode+0x1fb/0x6a0 fs/ocfs2/sysfile.c:114 ocfs2_init_global_system_inodes fs/ocfs2/super.c:462 [inline] ocfs2_initialize_super.isra.0+0x1d0d/0x31f0 fs/ocfs2/super.c:2283 ocfs2_fill_super+0x720/0x2f00 fs/ocfs2/super.c:1007 mount_bdev+0x2ce/0x3b0 fs/super.c:1366 legacy_get_tree+0xfc/0x1f0 fs/fs_context.c:592 vfs_get_tree+0x85/0x2d0 fs/super.c:1496 do_new_mount fs/namespace.c:2881 [inline] path_mount+0x41e/0x1b30 fs/namespace.c:3211 do_mount fs/namespace.c:3224 [inline] __do_sys_mount fs/namespace.c:3432 [inline] __se_sys_mount fs/namespace.c:3409 [inline] __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3409 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> #0 (&osb->system_file_mutex){+.+.}-{3:3}: check_prev_add+0x163/0x20f0 kernel/locking/lockdep.c:2868 check_prevs_add kernel/locking/lockdep.c:2993 [inline] validate_chain kernel/locking/lockdep.c:3608 [inline] __lock_acquire+0x2872/0x35d0 kernel/locking/lockdep.c:4832 lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1a8/0x730 kernel/locking/lockdep.c:5407 __mutex_lock_common kernel/locking/mutex.c:956 [inline] __mutex_lock+0x134/0x1130 kernel/locking/mutex.c:1103 ocfs2_get_system_file_inode+0x32d/0x6a0 fs/ocfs2/sysfile.c:103 ocfs2_reserve_local_alloc_bits+0xc4/0xa70 fs/ocfs2/localalloc.c:628 ocfs2_reserve_clusters_with_limit+0x3db/0x9a0 fs/ocfs2/suballoc.c:1164 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1225 [inline] ocfs2_lock_allocators+0x208/0x420 fs/ocfs2/suballoc.c:2670 ocfs2_write_begin_nolock+0x19f6/0x4f20 fs/ocfs2/aops.c:1745 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:95 [inline] ocfs2_page_mkwrite+0x5c2/0xa00 fs/ocfs2/mmap.c:146 do_page_mkwrite+0x18b/0x400 mm/memory.c:2714 do_shared_fault mm/memory.c:4083 [inline] do_fault mm/memory.c:4151 [inline] handle_pte_fault mm/memory.c:4387 [inline] __handle_mm_fault mm/memory.c:4522 [inline] handle_mm_fault+0x230a/0x3ba0 mm/memory.c:4620 do_user_addr_fault+0x2d3/0x930 arch/x86/mm/fault.c:1393 handle_page_fault arch/x86/mm/fault.c:1450 [inline] exc_page_fault+0x61/0xc0 arch/x86/mm/fault.c:1506 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:580 other info that might help us debug this: Chain exists of: &osb->system_file_mutex --> sb_pagefaults#2 --> &oi->ip_alloc_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&oi->ip_alloc_sem); lock(sb_pagefaults#2); lock(&oi->ip_alloc_sem); lock(&osb->system_file_mutex); *** DEADLOCK *** 3 locks held by syz.2.15/4713: #0: ffff88801e101d58 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline] #0: ffff88801e101d58 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x5f9/0x930 arch/x86/mm/fault.c:1344 #1: ffff888021326540 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x18b/0x400 mm/memory.c:2714 #2: ffff88802c5158e0 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_page_mkwrite+0x250/0xa00 fs/ocfs2/mmap.c:144 stack backtrace: CPU: 1 PID: 4713 Comm: syz.2.15 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x9a/0xcc lib/dump_stack.c:120 check_noncircular+0x263/0x2e0 kernel/locking/lockdep.c:2117 check_prev_add+0x163/0x20f0 kernel/locking/lockdep.c:2868 check_prevs_add kernel/locking/lockdep.c:2993 [inline] validate_chain kernel/locking/lockdep.c:3608 [inline] __lock_acquire+0x2872/0x35d0 kernel/locking/lockdep.c:4832 lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1a8/0x730 kernel/locking/lockdep.c:5407 __mutex_lock_common kernel/locking/mutex.c:956 [inline] __mutex_lock+0x134/0x1130 kernel/locking/mutex.c:1103 ocfs2_get_system_file_inode+0x32d/0x6a0 fs/ocfs2/sysfile.c:103 ocfs2_reserve_local_alloc_bits+0xc4/0xa70 fs/ocfs2/localalloc.c:628 ocfs2_reserve_clusters_with_limit+0x3db/0x9a0 fs/ocfs2/suballoc.c:1164 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1225 [inline] ocfs2_lock_allocators+0x208/0x420 fs/ocfs2/suballoc.c:2670 ocfs2_write_begin_nolock+0x19f6/0x4f20 fs/ocfs2/aops.c:1745 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:95 [inline] ocfs2_page_mkwrite+0x5c2/0xa00 fs/ocfs2/mmap.c:146 do_page_mkwrite+0x18b/0x400 mm/memory.c:2714 do_shared_fault mm/memory.c:4083 [inline] do_fault mm/memory.c:4151 [inline] handle_pte_fault mm/memory.c:4387 [inline] __handle_mm_fault mm/memory.c:4522 [inline] handle_mm_fault+0x230a/0x3ba0 mm/memory.c:4620 do_user_addr_fault+0x2d3/0x930 arch/x86/mm/fault.c:1393 handle_page_fault arch/x86/mm/fault.c:1450 [inline] exc_page_fault+0x61/0xc0 arch/x86/mm/fault.c:1506 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:580 RIP: 0033:0x7f42eb6681ab Code: fa 10 73 2d 83 fa 08 73 46 83 fa 04 73 16 83 fa 01 7c 10 8a 0e 74 0a 0f b7 74 16 fe 66 89 74 17 fe 88 0f c3 8b 4c 16 fc 8b 36 <89> 4c 17 fc 89 37 c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 c5 fa 7f 07 c5 RSP: 002b:00007ffc25ba3228 EFLAGS: 00010202 RAX: 0000000020005100 RBX: 0000000000000004 RCX: 0000000000736672 RDX: 0000000000000006 RSI: 0000000066727462 RDI: 0000000020005100 RBP: 00007f42eb859a80 R08: 00007f42eb522000 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000009 R12: 000000000001247e R13: 00007ffc25ba3330 R14: 0000000000000032 R15: fffffffffffffffe