overlayfs: failed to resolve './mnt': -2 ====================================================== WARNING: possible circular locking dependency detected 6.12.0-rc5-syzkaller-00181-g6c52d4da1c74 #0 Not tainted ------------------------------------------------------ syz.1.597/12166 is trying to acquire lock: ffff888061b45be0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_page_mkwrite+0x346/0xed0 fs/ocfs2/mmap.c:142 but task is already holding lock: ffff888068bcc518 (sb_pagefaults#8){.+.+}-{0:0}, at: do_page_mkwrite+0x198/0x480 mm/memory.c:3162 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_pagefaults#8){.+.+}-{0:0}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1716 [inline] sb_start_pagefault include/linux/fs.h:1881 [inline] ocfs2_page_mkwrite+0x222/0xed0 fs/ocfs2/mmap.c:122 do_page_mkwrite+0x198/0x480 mm/memory.c:3162 do_shared_fault mm/memory.c:5373 [inline] do_fault mm/memory.c:5435 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault+0x11fa/0x6800 mm/memory.c:5766 __handle_mm_fault mm/memory.c:5909 [inline] handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6077 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 filldir64+0x297/0x690 fs/readdir.c:369 dir_emit include/linux/fs.h:3663 [inline] ocfs2_dir_foreach_blk_id fs/ocfs2/dir.c:1792 [inline] ocfs2_dir_foreach_blk+0x1603/0x1b20 fs/ocfs2/dir.c:1912 ocfs2_readdir+0x2a1/0x5e0 fs/ocfs2/dir.c:1956 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65 iterate_dir+0x571/0x800 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:407 [inline] __se_sys_getdents64+0x1d3/0x4a0 fs/readdir.c:392 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&mm->mmap_lock){++++}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __might_fault+0xc6/0x120 mm/memory.c:6716 _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+0x235/0x410 fs/ioctl.c:145 ocfs2_fiemap_inline fs/ocfs2/extent_map.c:725 [inline] ocfs2_fiemap+0xc25/0xf80 fs/ocfs2/extent_map.c:762 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x1bf8/0x2e40 fs/ioctl.c:841 __do_sys_ioctl fs/ioctl.c:905 [inline] __se_sys_ioctl+0x81/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 ocfs2_page_mkwrite+0x346/0xed0 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x198/0x480 mm/memory.c:3162 do_shared_fault mm/memory.c:5373 [inline] do_fault mm/memory.c:5435 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault+0x11fa/0x6800 mm/memory.c:5766 __handle_mm_fault mm/memory.c:5909 [inline] handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6077 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 filldir64+0x297/0x690 fs/readdir.c:369 dir_emit include/linux/fs.h:3663 [inline] ocfs2_dir_foreach_blk_id fs/ocfs2/dir.c:1792 [inline] ocfs2_dir_foreach_blk+0x1603/0x1b20 fs/ocfs2/dir.c:1912 ocfs2_readdir+0x2a1/0x5e0 fs/ocfs2/dir.c:1956 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65 iterate_dir+0x571/0x800 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:407 [inline] __se_sys_getdents64+0x1d3/0x4a0 fs/readdir.c:392 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 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#8 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_pagefaults#8); lock(&mm->mmap_lock); lock(sb_pagefaults#8); lock(&ocfs2_file_ip_alloc_sem_key); *** DEADLOCK *** 4 locks held by syz.1.597/12166: #0: ffff88802442c2b8 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1160 #1: ffff88805bcad100 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: wrap_directory_iterator+0x5a/0xd0 fs/readdir.c:54 #2: ffff88801b758198 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline] #2: ffff88801b758198 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6114 [inline] #2: ffff88801b758198 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6174 #3: ffff888068bcc518 (sb_pagefaults#8){.+.+}-{0:0}, at: do_page_mkwrite+0x198/0x480 mm/memory.c:3162 stack backtrace: CPU: 0 UID: 0 PID: 12166 Comm: syz.1.597 Not tainted 6.12.0-rc5-syzkaller-00181-g6c52d4da1c74 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 ocfs2_page_mkwrite+0x346/0xed0 fs/ocfs2/mmap.c:142 do_page_mkwrite+0x198/0x480 mm/memory.c:3162 do_shared_fault mm/memory.c:5373 [inline] do_fault mm/memory.c:5435 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault+0x11fa/0x6800 mm/memory.c:5766 __handle_mm_fault mm/memory.c:5909 [inline] handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6077 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:filldir64+0x297/0x690 fs/readdir.c:373 Code: 81 ff 48 89 df 4c 89 f6 e8 96 35 81 ff 4c 39 f3 0f 82 5f 02 00 00 48 39 eb 0f 87 56 02 00 00 0f 01 cb 0f ae e8 48 8b 44 24 58 <49> 89 46 08 48 8b 4c 24 18 48 8b 44 24 50 48 89 01 48 8b 44 24 20 RSP: 0018:ffffc90004a87988 EFLAGS: 00050297 RAX: 0000000000000000 RBX: 0000000020000f98 RCX: ffff88802bf99e00 RDX: ffffc9000ad71000 RSI: 0000000020000f80 RDI: 0000000020000f98 RBP: 00007fffffffefff R08: ffffffff8213a68a R09: 0000000000000004 R10: dffffc0000000000 R11: ffffffff8213a410 R12: ffff88805f8442d4 R13: ffffc90004a87e50 R14: 0000000020000f80 R15: 0000000000000001 dir_emit include/linux/fs.h:3663 [inline] ocfs2_dir_foreach_blk_id fs/ocfs2/dir.c:1792 [inline] ocfs2_dir_foreach_blk+0x1603/0x1b20 fs/ocfs2/dir.c:1912 ocfs2_readdir+0x2a1/0x5e0 fs/ocfs2/dir.c:1956 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65 iterate_dir+0x571/0x800 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:407 [inline] __se_sys_getdents64+0x1d3/0x4a0 fs/readdir.c:392 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7febe577e719 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:00007febe64b0038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007febe5935f80 RCX: 00007febe577e719 RDX: 0000000000001000 RSI: 0000000020000f80 RDI: 0000000000000004 RBP: 00007febe57f132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007febe5935f80 R15: 00007fff3d632da8 ---------------- Code disassembly (best guess): 0: 81 ff 48 89 df 4c cmp $0x4cdf8948,%edi 6: 89 f6 mov %esi,%esi 8: e8 96 35 81 ff call 0xff8135a3 d: 4c 39 f3 cmp %r14,%rbx 10: 0f 82 5f 02 00 00 jb 0x275 16: 48 39 eb cmp %rbp,%rbx 19: 0f 87 56 02 00 00 ja 0x275 1f: 0f 01 cb stac 22: 0f ae e8 lfence 25: 48 8b 44 24 58 mov 0x58(%rsp),%rax * 2a: 49 89 46 08 mov %rax,0x8(%r14) <-- trapping instruction 2e: 48 8b 4c 24 18 mov 0x18(%rsp),%rcx 33: 48 8b 44 24 50 mov 0x50(%rsp),%rax 38: 48 89 01 mov %rax,(%rcx) 3b: 48 8b 44 24 20 mov 0x20(%rsp),%rax