====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc5-syzkaller-00300-g3ce9925823c7 #0 Not tainted ------------------------------------------------------ syz.0.867/14528 is trying to acquire lock: ffff88805a3bcda0 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_page_mkwrite+0x2ff/0xc40 fs/ocfs2/mmap.c:142 but task is already holding lock: ffff88807e500518 (sb_pagefaults#6){.+.+}-{0:0}, at: do_page_mkwrite+0x14a/0x310 mm/memory.c:3287 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_pagefaults#6){.+.+}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 percpu_down_read include/linux/percpu-rwsem.h:52 [inline] __sb_start_write include/linux/fs.h:1783 [inline] sb_start_pagefault include/linux/fs.h:1948 [inline] ocfs2_page_mkwrite+0x1da/0xc40 fs/ocfs2/mmap.c:122 do_page_mkwrite+0x14a/0x310 mm/memory.c:3287 do_shared_fault mm/memory.c:5594 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x18d2/0x5380 mm/memory.c:6140 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1388 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 user_access_begin arch/x86/include/asm/uaccess.h:-1 [inline] filldir64+0x299/0x690 fs/readdir.c:366 dir_emit include/linux/fs.h:3861 [inline] ocfs2_dir_foreach_blk_id fs/ocfs2/dir.c:1805 [inline] ocfs2_dir_foreach_blk+0x141c/0x18a0 fs/ocfs2/dir.c:1925 ocfs2_readdir+0x254/0x4c0 fs/ocfs2/dir.c:1969 wrap_directory_iterator+0x93/0xe0 fs/readdir.c:65 iterate_dir+0x5ac/0x770 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:403 [inline] __se_sys_getdents64+0xe4/0x260 fs/readdir.c:389 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 __might_fault+0xcc/0x130 mm/memory.c:7151 _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_inline fs/ocfs2/extent_map.c:735 [inline] ocfs2_fiemap+0x9dc/0xc90 fs/ocfs2/extent_map.c:772 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x1638/0x1eb0 fs/ioctl.c:840 __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0x82/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 ocfs2_page_mkwrite+0x2ff/0xc40 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x14a/0x310 mm/memory.c:3287 do_shared_fault mm/memory.c:5594 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x18d2/0x5380 mm/memory.c:6140 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1388 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 user_access_begin arch/x86/include/asm/uaccess.h:-1 [inline] filldir64+0x299/0x690 fs/readdir.c:366 dir_emit include/linux/fs.h:3861 [inline] ocfs2_dir_foreach_blk_id fs/ocfs2/dir.c:1805 [inline] ocfs2_dir_foreach_blk+0x141c/0x18a0 fs/ocfs2/dir.c:1925 ocfs2_readdir+0x254/0x4c0 fs/ocfs2/dir.c:1969 wrap_directory_iterator+0x93/0xe0 fs/readdir.c:65 iterate_dir+0x5ac/0x770 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:403 [inline] __se_sys_getdents64+0xe4/0x260 fs/readdir.c:389 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 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: &ocfs2_file_ip_alloc_sem_key --> &mm->mmap_lock --> sb_pagefaults#6 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_pagefaults#6); lock(&mm->mmap_lock); lock(sb_pagefaults#6); lock(&ocfs2_file_ip_alloc_sem_key); *** DEADLOCK *** 4 locks held by syz.0.867/14528: #0: ffff88803017d0b8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1213 #1: ffff888051963480 (&type->i_mutex_dir_key#13){++++}-{4:4}, at: wrap_directory_iterator+0x5a/0xe0 fs/readdir.c:54 #2: ffff888028e26fe0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:203 [inline] #2: ffff888028e26fe0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/memory.c:6346 [inline] #2: ffff888028e26fe0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x300 mm/memory.c:6406 #3: ffff88807e500518 (sb_pagefaults#6){.+.+}-{0:0}, at: do_page_mkwrite+0x14a/0x310 mm/memory.c:3287 stack backtrace: CPU: 0 UID: 0 PID: 14528 Comm: syz.0.867 Not tainted 6.15.0-rc5-syzkaller-00300-g3ce9925823c7 #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:2079 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 ocfs2_page_mkwrite+0x2ff/0xc40 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x14a/0x310 mm/memory.c:3287 do_shared_fault mm/memory.c:5594 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x18d2/0x5380 mm/memory.c:6140 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1388 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:filldir64+0x299/0x690 fs/readdir.c:370 Code: 8a ff 4c 89 e7 4c 89 f6 e8 84 72 8a ff 4d 39 f4 0f 82 55 02 00 00 4d 39 fc 0f 87 4c 02 00 00 0f 01 cb 0f ae e8 48 8b 44 24 60 <49> 89 46 08 48 8b 4c 24 38 48 8b 44 24 58 48 89 01 48 8b 44 24 10 RSP: 0018:ffffc90002e979e0 EFLAGS: 00050283 RAX: 0000000000000000 RBX: ffffc90002e97e50 RCX: ffff888027a31e00 RDX: 0000000000000002 RSI: 0000200000000f80 RDI: 0000200000000f98 RBP: 0000000000000001 R08: 0000000000000041 R09: 0000000000000004 R10: dffffc0000000000 R11: ffffffff82355ca0 R12: 0000200000000f98 R13: ffff88804e4662d4 R14: 0000200000000f80 R15: 00007ffffffff000 dir_emit include/linux/fs.h:3861 [inline] ocfs2_dir_foreach_blk_id fs/ocfs2/dir.c:1805 [inline] ocfs2_dir_foreach_blk+0x141c/0x18a0 fs/ocfs2/dir.c:1925 ocfs2_readdir+0x254/0x4c0 fs/ocfs2/dir.c:1969 wrap_directory_iterator+0x93/0xe0 fs/readdir.c:65 iterate_dir+0x5ac/0x770 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:403 [inline] __se_sys_getdents64+0xe4/0x260 fs/readdir.c:389 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc06a58e969 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:00007fc06b465038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007fc06a7b5fa0 RCX: 00007fc06a58e969 RDX: 0000000000001000 RSI: 0000200000000f80 RDI: 0000000000000007 RBP: 00007fc06a610ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc06a7b5fa0 R15: 00007ffe3229f478 ---------------- Code disassembly (best guess): 0: 8a ff mov %bh,%bh 2: 4c 89 e7 mov %r12,%rdi 5: 4c 89 f6 mov %r14,%rsi 8: e8 84 72 8a ff call 0xff8a7291 d: 4d 39 f4 cmp %r14,%r12 10: 0f 82 55 02 00 00 jb 0x26b 16: 4d 39 fc cmp %r15,%r12 19: 0f 87 4c 02 00 00 ja 0x26b 1f: 0f 01 cb stac 22: 0f ae e8 lfence 25: 48 8b 44 24 60 mov 0x60(%rsp),%rax * 2a: 49 89 46 08 mov %rax,0x8(%r14) <-- trapping instruction 2e: 48 8b 4c 24 38 mov 0x38(%rsp),%rcx 33: 48 8b 44 24 58 mov 0x58(%rsp),%rax 38: 48 89 01 mov %rax,(%rcx) 3b: 48 8b 44 24 10 mov 0x10(%rsp),%rax