===================================== WARNING: bad unlock balance detected! 6.16.0-rc2-syzkaller #0 Not tainted ------------------------------------- syz.5.25/6454 is trying to release lock (&mapping->i_mmap_rwsem) at: [] i_mmap_unlock_write include/linux/fs.h:555 [inline] [] maybe_drop_rmap_locks mm/mremap.c:196 [inline] [] move_pgt_entry+0xbf7/0xd30 mm/mremap.c:632 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz.5.25/6454: #0: ffff888113cab660 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:374 [inline] #0: ffff888113cab660 (&mm->mmap_lock){++++}-{4:4}, at: do_mremap mm/mremap.c:2061 [inline] #0: ffff888113cab660 (&mm->mmap_lock){++++}-{4:4}, at: __do_sys_mremap mm/mremap.c:2143 [inline] #0: ffff888113cab660 (&mm->mmap_lock){++++}-{4:4}, at: __se_sys_mremap+0x3e0/0xc40 mm/mremap.c:2111 stack backtrace: CPU: 0 UID: 0 PID: 6454 Comm: syz.5.25 Not tainted 6.16.0-rc2-syzkaller #0 PREEMPT(undef) 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:555 [inline] maybe_drop_rmap_locks mm/mremap.c:196 [inline] move_pgt_entry+0xbf7/0xd30 mm/mremap.c:632 move_page_tables+0xb18/0x1a90 mm/mremap.c:1074 copy_vma_and_data mm/mremap.c:1498 [inline] move_vma+0xd13/0x1f90 mm/mremap.c:1604 mremap_to+0x7e7/0x8b0 mm/mremap.c:1797 do_mremap mm/mremap.c:2086 [inline] __do_sys_mremap mm/mremap.c:2143 [inline] __se_sys_mremap+0x901/0xc40 mm/mremap.c:2111 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: 0033:0x7f2a10dae929 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:00007f2a107fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 RAX: ffffffffffffffda RBX: 00007f2a10fd6080 RCX: 00007f2a10dae929 RDX: 0000000000200000 RSI: 0000000000600600 RDI: 0000200000000000 RBP: 00007f2a10e30b39 R08: 0000200000a00000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2a10fd6080 R15: 00007fff68c67ce8 ------------[ cut here ]------------ DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88812331ab18, owner = 0x0, curr 0xffff88810abc1d00, list empty WARNING: CPU: 0 PID: 6454 at kernel/locking/rwsem.c:1368 __up_write kernel/locking/rwsem.c:1367 [inline] WARNING: CPU: 0 PID: 6454 at kernel/locking/rwsem.c:1368 up_write+0x3a2/0x420 kernel/locking/rwsem.c:1630 Modules linked in: CPU: 0 UID: 0 PID: 6454 Comm: syz.5.25 Not tainted 6.16.0-rc2-syzkaller #0 PREEMPT(undef) 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 80 24 89 85 48 c7 c6 a0 26 89 85 48 8b 14 24 4c 89 f1 4d 89 e0 4c 8b 4c 24 08 41 52 e8 63 db e9 ff 48 83 c4 08 90 <0f> 0b 90 90 e9 6d fd ff ff 48 c7 c1 f4 3d 4e 87 80 e1 07 80 c1 03 RSP: 0018:ffffc900020a7500 EFLAGS: 00010296 RAX: 1e79ad0dbfc03a00 RBX: ffff88812331ab18 RCX: ffff88810abc1d00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002 RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff0d2d48c R12: 0000000000000000 R13: ffff88812331ab70 R14: ffff88812331ab18 R15: 1ffff11024663564 FS: 00007f2a107fe6c0(0000) GS:ffff88826d29d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2de5ffff CR3: 0000000134468000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: i_mmap_unlock_write include/linux/fs.h:555 [inline] maybe_drop_rmap_locks mm/mremap.c:196 [inline] move_pgt_entry+0xbf7/0xd30 mm/mremap.c:632 move_page_tables+0xb18/0x1a90 mm/mremap.c:1074 copy_vma_and_data mm/mremap.c:1498 [inline] move_vma+0xd13/0x1f90 mm/mremap.c:1604 mremap_to+0x7e7/0x8b0 mm/mremap.c:1797 do_mremap mm/mremap.c:2086 [inline] __do_sys_mremap mm/mremap.c:2143 [inline] __se_sys_mremap+0x901/0xc40 mm/mremap.c:2111 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: 0033:0x7f2a10dae929 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:00007f2a107fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 RAX: ffffffffffffffda RBX: 00007f2a10fd6080 RCX: 00007f2a10dae929 RDX: 0000000000200000 RSI: 0000000000600600 RDI: 0000200000000000 RBP: 00007f2a10e30b39 R08: 0000200000a00000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2a10fd6080 R15: 00007fff68c67ce8