===================================== WARNING: bad unlock balance detected! 6.16.0-rc2-next-20250616-syzkaller #0 Not tainted ------------------------------------- syz.3.148/6672 is trying to release lock (&mapping->i_mmap_rwsem) at: [] i_mmap_unlock_write include/linux/fs.h:557 [inline] [] maybe_drop_rmap_locks mm/mremap.c:197 [inline] [] move_pgt_entry mm/mremap.c:686 [inline] [] move_page_tables+0xf51/0x2940 mm/mremap.c:1358 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz.3.148/6672: #0: ffff888067e8ed60 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:374 [inline] #0: ffff888067e8ed60 (&mm->mmap_lock){++++}-{4:4}, at: do_mremap mm/mremap.c:2371 [inline] #0: ffff888067e8ed60 (&mm->mmap_lock){++++}-{4:4}, at: __do_sys_mremap mm/mremap.c:2453 [inline] #0: ffff888067e8ed60 (&mm->mmap_lock){++++}-{4:4}, at: __se_sys_mremap+0x3c0/0xc60 mm/mremap.c:2421 stack backtrace: CPU: 1 UID: 0 PID: 6672 Comm: syz.3.148 Not tainted 6.16.0-rc2-next-20250616-syzkaller #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_unlock_imbalance_bug+0xdc/0xf0 kernel/locking/lockdep.c:5301 __lock_release kernel/locking/lockdep.c:5540 [inline] lock_release+0x269/0x3e0 kernel/locking/lockdep.c:5892 up_write+0x2d/0x420 kernel/locking/rwsem.c:1629 i_mmap_unlock_write include/linux/fs.h:557 [inline] maybe_drop_rmap_locks mm/mremap.c:197 [inline] move_pgt_entry mm/mremap.c:686 [inline] move_page_tables+0xf51/0x2940 mm/mremap.c:1358 copy_vma_and_data mm/mremap.c:1807 [inline] move_vma+0xd5e/0x2010 mm/mremap.c:1913 mremap_to+0x7e7/0x8b0 mm/mremap.c:2106 do_mremap mm/mremap.c:2396 [inline] __do_sys_mremap mm/mremap.c:2453 [inline] __se_sys_mremap+0x8f5/0xc60 mm/mremap.c:2421 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7b8038e929 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:00007f7b81264038 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 RAX: ffffffffffffffda RBX: 00007f7b805b6240 RCX: 00007f7b8038e929 RDX: 0000000000200000 RSI: 0000000000600600 RDI: 0000200000000000 RBP: 00007f7b80410b39 R08: 0000200000a00000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f7b805b6240 R15: 00007ffd9eb353e8 ------------[ cut here ]------------ DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888053960bb0, owner = 0x0, curr 0xffff88802a7d0000, list empty WARNING: kernel/locking/rwsem.c:1368 at __up_write kernel/locking/rwsem.c:1367 [inline], CPU#1: syz.3.148/6672 WARNING: kernel/locking/rwsem.c:1368 at up_write+0x3a2/0x420 kernel/locking/rwsem.c:1630, CPU#1: syz.3.148/6672 Modules linked in: CPU: 1 UID: 0 PID: 6672 Comm: syz.3.148 Not tainted 6.16.0-rc2-next-20250616-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__up_write kernel/locking/rwsem.c:1367 [inline] RIP: 0010:up_write+0x3a2/0x420 kernel/locking/rwsem.c:1630 Code: d0 48 c7 c7 60 ee 8a 8b 48 c7 c6 80 f0 8a 8b 48 8b 14 24 4c 89 f1 4d 89 e0 4c 8b 4c 24 08 41 52 e8 23 3b e6 ff 48 83 c4 08 90 <0f> 0b 90 90 e9 6d fd ff ff 48 c7 c1 34 81 a1 8f 80 e1 07 80 c1 03 RSP: 0018:ffffc9000ab67530 EFLAGS: 00010296 RAX: 7a6412b148f80100 RBX: ffff888053960bb0 RCX: 0000000000080000 RDX: ffffc9000fe71000 RSI: 000000000002b0ed RDI: 000000000002b0ee RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bfaa14 R12: 0000000000000000 R13: ffff888053960c08 R14: ffff888053960bb0 R15: 1ffff1100a72c177 FS: 00007f7b812646c0(0000) GS:ffff888125d40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7b81263f98 CR3: 00000000642b0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: i_mmap_unlock_write include/linux/fs.h:557 [inline] maybe_drop_rmap_locks mm/mremap.c:197 [inline] move_pgt_entry mm/mremap.c:686 [inline] move_page_tables+0xf51/0x2940 mm/mremap.c:1358 copy_vma_and_data mm/mremap.c:1807 [inline] move_vma+0xd5e/0x2010 mm/mremap.c:1913 mremap_to+0x7e7/0x8b0 mm/mremap.c:2106 do_mremap mm/mremap.c:2396 [inline] __do_sys_mremap mm/mremap.c:2453 [inline] __se_sys_mremap+0x8f5/0xc60 mm/mremap.c:2421 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7b8038e929 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:00007f7b81264038 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 RAX: ffffffffffffffda RBX: 00007f7b805b6240 RCX: 00007f7b8038e929 RDX: 0000000000200000 RSI: 0000000000600600 RDI: 0000200000000000 RBP: 00007f7b80410b39 R08: 0000200000a00000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f7b805b6240 R15: 00007ffd9eb353e8