======================================================
WARNING: possible circular locking dependency detected
6.8.0-rc1-next-20240125-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.4/14241 is trying to acquire lock:
ffffffff8d725f60
 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline]
 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:3762 [inline]
 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3843 [inline]
 (fs_reclaim){+.+.}-{0:0}, at: kmalloc_trace+0x51/0x330 mm/slub.c:4008

but task is already holding lock:
ffff888016f2f648 (ptlock_ptr(ptdesc)){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
ffff888016f2f648 (ptlock_ptr(ptdesc)){+.+.}-{2:2}, at: huge_pte_lock include/linux/hugetlb.h:1232 [inline]
ffff888016f2f648 (ptlock_ptr(ptdesc)){+.+.}-{2:2}, at: __unmap_hugepage_range+0x4e5/0x1bf0 mm/hugetlb.c:5611

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (ptlock_ptr(ptdesc)){+.+.}-{2:2}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
       _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
       spin_lock include/linux/spinlock.h:351 [inline]
       pmd_lock include/linux/mm.h:3036 [inline]
       __split_huge_pmd+0x21f/0x2ec0 mm/huge_memory.c:2631
       split_huge_pmd_address mm/huge_memory.c:2664 [inline]
       split_huge_pmd_if_needed mm/huge_memory.c:2676 [inline]
       split_huge_pmd_if_needed mm/huge_memory.c:2667 [inline]
       vma_adjust_trans_huge+0x2da/0x560 mm/huge_memory.c:2688
       __split_vma+0xcb9/0x1190 mm/mmap.c:2365
       split_vma mm/mmap.c:2401 [inline]
       vma_modify+0x261/0x460 mm/mmap.c:2436
       vma_modify_flags include/linux/mm.h:3283 [inline]
       mprotect_fixup+0x228/0xc90 mm/mprotect.c:635
       do_mprotect_pkey+0x8a4/0xdc0 mm/mprotect.c:809
       __do_sys_mprotect mm/mprotect.c:830 [inline]
       __se_sys_mprotect mm/mprotect.c:827 [inline]
       __x64_sys_mprotect+0x78/0xc0 mm/mprotect.c:827
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x6d/0x75

-> #1 (&mapping->i_mmap_rwsem){++++}-{3:3}:
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1579
       i_mmap_lock_write include/linux/fs.h:512 [inline]
       dma_resv_lockdep+0x292/0x620 drivers/dma-buf/dma-resv.c:787
       do_one_initcall+0x128/0x690 init/main.c:1236
       do_initcall_level init/main.c:1298 [inline]
       do_initcalls init/main.c:1314 [inline]
       do_basic_setup init/main.c:1333 [inline]
       kernel_init_freeable+0x698/0xc30 init/main.c:1551
       kernel_init+0x1c/0x2a0 init/main.c:1441
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242

-> #0 (fs_reclaim){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
       lock_acquire kernel/locking/lockdep.c:5754 [inline]
       lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
       __fs_reclaim_acquire mm/page_alloc.c:3728 [inline]
       fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:3742
       might_alloc include/linux/sched/mm.h:303 [inline]
       slab_pre_alloc_hook mm/slub.c:3762 [inline]
       slab_alloc_node mm/slub.c:3843 [inline]
       kmalloc_trace+0x51/0x330 mm/slub.c:4008
       kmalloc include/linux/slab.h:590 [inline]
       allocate_file_region_entries+0x1a3/0x620 mm/hugetlb.c:666
       region_chg+0x85/0x140 mm/hugetlb.c:786
       __vma_reservation_common+0x443/0x740 mm/hugetlb.c:2832
       vma_needs_reservation mm/hugetlb.c:2899 [inline]
       __unmap_hugepage_range+0xfdb/0x1bf0 mm/hugetlb.c:5681
       unmap_single_vma+0x24b/0x2b0 mm/memory.c:1813
       unmap_vmas+0x22f/0x490 mm/memory.c:1861
       unmap_region+0x1f3/0x420 mm/mmap.c:2300
       do_vmi_align_munmap+0x11b3/0x1ad0 mm/mmap.c:2621
       do_vmi_munmap+0x20b/0x450 mm/mmap.c:2689
       mmap_region+0x188/0x2810 mm/mmap.c:2740
       do_mmap+0x8ae/0xf10 mm/mmap.c:1375
       vm_mmap_pgoff+0x1f6/0x410 mm/util.c:573
       ksys_mmap_pgoff+0x425/0x5b0 mm/mmap.c:1421
       __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline]
       __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
       __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:86
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x6d/0x75

other info that might help us debug this:

Chain exists of:
  fs_reclaim --> &mapping->i_mmap_rwsem --> ptlock_ptr(ptdesc)

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(ptlock_ptr(ptdesc));
                               lock(&mapping->i_mmap_rwsem);
                               lock(ptlock_ptr(ptdesc));
  lock(fs_reclaim);

 *** DEADLOCK ***

4 locks held by syz-executor.4/14241:
 #0: ffff88806a523aa0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:128 [inline]
 #0: ffff88806a523aa0 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x160/0x410 mm/util.c:571
 #1: ffff88807b7428e8 (&resv_map->rw_sema){++++}-{3:3}, at: hugetlb_vma_lock_write mm/hugetlb.c:300 [inline]
 #1: ffff88807b7428e8 (&resv_map->rw_sema){++++}-{3:3}, at: hugetlb_vma_lock_write+0x105/0x140 mm/hugetlb.c:291
 #2: ffff88807bb6c3c8 (&hugetlbfs_i_mmap_rwsem_key){+.+.}-{3:3}, at: i_mmap_lock_write include/linux/fs.h:512 [inline]
 #2: ffff88807bb6c3c8 (&hugetlbfs_i_mmap_rwsem_key){+.+.}-{3:3}, at: __hugetlb_zap_begin+0x242/0x2b0 mm/hugetlb.c:5726
 #3: ffff888016f2f648 (ptlock_ptr(ptdesc)){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #3: ffff888016f2f648 (ptlock_ptr(ptdesc)){+.+.}-{2:2}, at: huge_pte_lock include/linux/hugetlb.h:1232 [inline]
 #3: ffff888016f2f648 (ptlock_ptr(ptdesc)){+.+.}-{2:2}, at: __unmap_hugepage_range+0x4e5/0x1bf0 mm/hugetlb.c:5611

stack backtrace:
CPU: 0 PID: 14241 Comm: syz-executor.4 Not tainted 6.8.0-rc1-next-20240125-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
 __fs_reclaim_acquire mm/page_alloc.c:3728 [inline]
 fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:3742
 might_alloc include/linux/sched/mm.h:303 [inline]
 slab_pre_alloc_hook mm/slub.c:3762 [inline]
 slab_alloc_node mm/slub.c:3843 [inline]
 kmalloc_trace+0x51/0x330 mm/slub.c:4008
 kmalloc include/linux/slab.h:590 [inline]
 allocate_file_region_entries+0x1a3/0x620 mm/hugetlb.c:666
 region_chg+0x85/0x140 mm/hugetlb.c:786
 __vma_reservation_common+0x443/0x740 mm/hugetlb.c:2832
 vma_needs_reservation mm/hugetlb.c:2899 [inline]
 __unmap_hugepage_range+0xfdb/0x1bf0 mm/hugetlb.c:5681
 unmap_single_vma+0x24b/0x2b0 mm/memory.c:1813
 unmap_vmas+0x22f/0x490 mm/memory.c:1861
 unmap_region+0x1f3/0x420 mm/mmap.c:2300
 do_vmi_align_munmap+0x11b3/0x1ad0 mm/mmap.c:2621
 do_vmi_munmap+0x20b/0x450 mm/mmap.c:2689
 mmap_region+0x188/0x2810 mm/mmap.c:2740
 do_mmap+0x8ae/0xf10 mm/mmap.c:1375
 vm_mmap_pgoff+0x1f6/0x410 mm/util.c:573
 ksys_mmap_pgoff+0x425/0x5b0 mm/mmap.c:1421
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:86
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f53ba07cda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f53badc20c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f53ba1abf80 RCX: 00007f53ba07cda9
RDX: 0000000000000000 RSI: 0000000000400000 RDI: 0000000020000000
RBP: 00007f53ba0c947a R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f53ba1abf80 R15: 00007ffda184e9d8
 </TASK>
BUG: sleeping function called from invalid context at include/linux/sched/mm.h:306
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 14241, name: syz-executor.4
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
INFO: lockdep is turned off.
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 PID: 14241 Comm: syz-executor.4 Not tainted 6.8.0-rc1-next-20240125-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
 __might_resched+0x3c0/0x5e0 kernel/sched/core.c:10178
 might_alloc include/linux/sched/mm.h:306 [inline]
 might_alloc include/linux/sched/mm.h:301 [inline]
 slab_pre_alloc_hook mm/slub.c:3762 [inline]
 slab_alloc_node mm/slub.c:3843 [inline]
 kmalloc_trace+0x2a3/0x330 mm/slub.c:4008
 kmalloc include/linux/slab.h:590 [inline]
 allocate_file_region_entries+0x1a3/0x620 mm/hugetlb.c:666
 region_chg+0x85/0x140 mm/hugetlb.c:786
 __vma_reservation_common+0x443/0x740 mm/hugetlb.c:2832
 vma_needs_reservation mm/hugetlb.c:2899 [inline]
 __unmap_hugepage_range+0xfdb/0x1bf0 mm/hugetlb.c:5681
 unmap_single_vma+0x24b/0x2b0 mm/memory.c:1813
 unmap_vmas+0x22f/0x490 mm/memory.c:1861
 unmap_region+0x1f3/0x420 mm/mmap.c:2300
 do_vmi_align_munmap+0x11b3/0x1ad0 mm/mmap.c:2621
 do_vmi_munmap+0x20b/0x450 mm/mmap.c:2689
 mmap_region+0x188/0x2810 mm/mmap.c:2740
 do_mmap+0x8ae/0xf10 mm/mmap.c:1375
 vm_mmap_pgoff+0x1f6/0x410 mm/util.c:573
 ksys_mmap_pgoff+0x425/0x5b0 mm/mmap.c:1421
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:86
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f53ba07cda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f53badc20c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f53ba1abf80 RCX: 00007f53ba07cda9
RDX: 0000000000000000 RSI: 0000000000400000 RDI: 0000000020000000
RBP: 00007f53ba0c947a R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f53ba1abf80 R15: 00007ffda184e9d8
 </TASK>