====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc4-syzkaller #0 Not tainted ------------------------------------------------------ syz.7.225/8546 is trying to acquire lock: ffff88805a96f360 (mapping.invalidate_lock#4){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] ffff88805a96f360 (mapping.invalidate_lock#4){++++}-{4:4}, at: filemap_fault+0x7f8/0x16c0 mm/filemap.c:3435 but task is already holding lock: ffff888035026360 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:209 [inline] ffff888035026360 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/memory.c:6249 [inline] ffff888035026360 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6309 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __might_fault+0xc6/0x120 mm/memory.c:6851 _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+0x235/0x420 fs/ioctl.c:145 ni_fiemap+0xa2f/0x1270 fs/ntfs3/frecord.c:2064 ntfs_fiemap+0x132/0x180 fs/ntfs3/file.c:1360 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x1981/0x2770 fs/ioctl.c:840 __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0x80/0x170 fs/ioctl.c:892 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 (&ni->ni_lock#2/5){+.+.}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730 ni_lock fs/ntfs3/ntfs_fs.h:1111 [inline] ntfs_fallocate+0x93e/0x1270 fs/ntfs3/file.c:684 vfs_fallocate+0x623/0x7a0 fs/open.c:338 ksys_fallocate fs/open.c:362 [inline] __do_sys_fallocate fs/open.c:367 [inline] __se_sys_fallocate fs/open.c:365 [inline] __x64_sys_fallocate+0xbc/0x110 fs/open.c:365 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 (mapping.invalidate_lock#4){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 down_read+0xb1/0xa40 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] filemap_fault+0x7f8/0x16c0 mm/filemap.c:3435 __do_fault+0x135/0x390 mm/memory.c:4988 do_read_fault mm/memory.c:5403 [inline] do_fault mm/memory.c:5537 [inline] do_pte_missing mm/memory.c:4058 [inline] handle_pte_fault mm/memory.c:5900 [inline] __handle_mm_fault+0x4c44/0x70f0 mm/memory.c:6043 handle_mm_fault+0x2c1/0x7e0 mm/memory.c:6212 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x2b9/0x8b0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 strncpy_from_user+0xbb/0x270 lib/strncpy_from_user.c:130 getname_flags+0xf1/0x540 fs/namei.c:150 do_sys_openat2+0xd2/0x1d0 fs/open.c:1422 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1454 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: mapping.invalidate_lock#4 --> &ni->ni_lock#2/5 --> &mm->mmap_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&mm->mmap_lock); lock(&ni->ni_lock#2/5); lock(&mm->mmap_lock); rlock(mapping.invalidate_lock#4); *** DEADLOCK *** 1 lock held by syz.7.225/8546: #0: ffff888035026360 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:209 [inline] #0: ffff888035026360 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/memory.c:6249 [inline] #0: ffff888035026360 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6309 stack backtrace: CPU: 1 UID: 0 PID: 8546 Comm: syz.7.225 Not tainted 6.14.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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:2076 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 down_read+0xb1/0xa40 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] filemap_fault+0x7f8/0x16c0 mm/filemap.c:3435 __do_fault+0x135/0x390 mm/memory.c:4988 do_read_fault mm/memory.c:5403 [inline] do_fault mm/memory.c:5537 [inline] do_pte_missing mm/memory.c:4058 [inline] handle_pte_fault mm/memory.c:5900 [inline] __handle_mm_fault+0x4c44/0x70f0 mm/memory.c:6043 handle_mm_fault+0x2c1/0x7e0 mm/memory.c:6212 do_user_addr_fault arch/x86/mm/fault.c:1388 [inline] handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x2b9/0x8b0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] RIP: 0010:strncpy_from_user+0xbb/0x270 lib/strncpy_from_user.c:130 Code: 00 4c 89 f6 e8 26 52 9c fc 49 83 fe 07 0f 86 90 00 00 00 4c 89 24 24 4c 89 74 24 08 49 c7 c4 f8 ff ff ff 45 31 ed 48 8b 04 24 <4e> 8b 34 28 48 b8 ff fe fe fe fe fe fe fe 49 8d 2c 06 4c 89 f3 48 RSP: 0018:ffffc90003bd7cb0 EFLAGS: 00050246 RAX: 0000400000001b40 RBX: ffff88804eeb6600 RCX: ffff888028360000 RDX: ffffc900050e2000 RSI: 0000000000000fe0 RDI: 0000000000000007 RBP: ffff88804eeb6620 R08: ffffffff8525705a R09: 1ffffffff207784e R10: dffffc0000000000 R11: fffffbfff207784f R12: fffffffffffffff8 R13: 0000000000000000 R14: 0000000000000fe0 R15: ffff88804eeb6620 getname_flags+0xf1/0x540 fs/namei.c:150 do_sys_openat2+0xd2/0x1d0 fs/open.c:1422 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1454 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: 0033:0x7f260fd8d169 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:00007f2610b92038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f260ffa5fa0 RCX: 00007f260fd8d169 RDX: 0000000000143042 RSI: 0000400000001b40 RDI: ffffffffffffff9c RBP: 00007f260fe0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000f8 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f260ffa5fa0 R15: 00007ffc733334e8 ---------------- Code disassembly (best guess): 0: 00 4c 89 f6 add %cl,-0xa(%rcx,%rcx,4) 4: e8 26 52 9c fc call 0xfc9c522f 9: 49 83 fe 07 cmp $0x7,%r14 d: 0f 86 90 00 00 00 jbe 0xa3 13: 4c 89 24 24 mov %r12,(%rsp) 17: 4c 89 74 24 08 mov %r14,0x8(%rsp) 1c: 49 c7 c4 f8 ff ff ff mov $0xfffffffffffffff8,%r12 23: 45 31 ed xor %r13d,%r13d 26: 48 8b 04 24 mov (%rsp),%rax * 2a: 4e 8b 34 28 mov (%rax,%r13,1),%r14 <-- trapping instruction 2e: 48 b8 ff fe fe fe fe movabs $0xfefefefefefefeff,%rax 35: fe fe fe 38: 49 8d 2c 06 lea (%r14,%rax,1),%rbp 3c: 4c 89 f3 mov %r14,%rbx 3f: 48 rex.W