====================================================== WARNING: possible circular locking dependency detected 6.8.0-rc1-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/2670 is trying to acquire lock: ffffffff833a7900 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline] ffffffff833a7900 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:3761 [inline] ffffffff833a7900 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3842 [inline] ffffffff833a7900 (fs_reclaim){+.+.}-{0:0}, at: kmalloc_trace+0x57/0x350 mm/slub.c:4007 but task is already holding lock: ffff888101eba8d8 (ptlock_ptr(ptdesc)){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff888101eba8d8 (ptlock_ptr(ptdesc)){+.+.}-{2:2}, at: huge_pte_lock include/linux/hugetlb.h:1232 [inline] ffff888101eba8d8 (ptlock_ptr(ptdesc)){+.+.}-{2:2}, at: __unmap_hugepage_range+0x14b/0x810 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+0xf5/0x1140 mm/huge_memory.c:2622 split_huge_pmd_address mm/huge_memory.c:2655 [inline] split_huge_pmd_if_needed mm/huge_memory.c:2667 [inline] split_huge_pmd_if_needed mm/huge_memory.c:2658 [inline] vma_adjust_trans_huge+0xdd/0x1a0 mm/huge_memory.c:2679 __split_vma+0x312/0x3f0 mm/mmap.c:2369 split_vma mm/mmap.c:2405 [inline] vma_modify+0x8b/0xd0 mm/mmap.c:2440 vma_modify_flags include/linux/mm.h:3283 [inline] mprotect_fixup+0xad/0x3d0 mm/mprotect.c:635 do_mprotect_pkey+0x30a/0x560 mm/mprotect.c:809 __do_sys_mprotect mm/mprotect.c:830 [inline] __se_sys_mprotect mm/mprotect.c:827 [inline] __x64_sys_mprotect+0x1a/0x20 mm/mprotect.c:827 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x84/0x180 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b -> #1 (&mapping->i_mmap_rwsem){++++}-{3:3}: down_write+0x29/0xb0 kernel/locking/rwsem.c:1579 i_mmap_lock_write include/linux/fs.h:512 [inline] dma_resv_lockdep+0x1b2/0x2e0 drivers/dma-buf/dma-resv.c:787 do_one_initcall+0x6b/0x300 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+0x250/0x3f0 init/main.c:1551 kernel_init+0x15/0x190 init/main.c:1441 ret_from_fork+0x2c/0x40 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 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+0x1293/0x1a70 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0xcd/0x2d0 kernel/locking/lockdep.c:5719 __fs_reclaim_acquire mm/page_alloc.c:3692 [inline] fs_reclaim_acquire+0x9d/0xd0 mm/page_alloc.c:3706 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slub.c:3761 [inline] slab_alloc_node mm/slub.c:3842 [inline] kmalloc_trace+0x57/0x350 mm/slub.c:4007 kmalloc include/linux/slab.h:590 [inline] allocate_file_region_entries+0x9a/0x1c0 mm/hugetlb.c:666 region_chg+0x57/0x80 mm/hugetlb.c:786 __vma_reservation_common+0x12b/0x250 mm/hugetlb.c:2832 vma_needs_reservation mm/hugetlb.c:2899 [inline] __unmap_hugepage_range+0x4f2/0x810 mm/hugetlb.c:5681 unmap_vmas+0xe7/0x1c0 mm/memory.c:1758 exit_mmap+0x100/0x470 mm/mmap.c:3277 __mmput+0x3a/0x110 kernel/fork.c:1343 exit_mm kernel/exit.c:569 [inline] do_exit+0x2fa/0xb90 kernel/exit.c:858 do_group_exit+0x32/0xa0 kernel/exit.c:1020 __do_sys_exit_group kernel/exit.c:1031 [inline] __se_sys_exit_group kernel/exit.c:1029 [inline] __x64_sys_exit_group+0x13/0x20 kernel/exit.c:1029 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x84/0x180 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b 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.0/2670: #0: ffff888107b73620 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:146 [inline] #0: ffff888107b73620 (&mm->mmap_lock){++++}-{3:3}, at: exit_mmap+0x83/0x470 mm/mmap.c:3261 #1: ffff8881073898e8 (&resv_map->rw_sema){++++}-{3:3}, at: __hugetlb_zap_begin+0x7b/0xa0 mm/hugetlb.c:5724 #2: ffff888101ac4ce8 (&hugetlbfs_i_mmap_rwsem_key){+.+.}-{3:3}, at: hugetlb_zap_begin include/linux/hugetlb.h:258 [inline] #2: ffff888101ac4ce8 (&hugetlbfs_i_mmap_rwsem_key){+.+.}-{3:3}, at: unmap_vmas+0x132/0x1c0 mm/memory.c:1757 #3: ffff888101eba8d8 (ptlock_ptr(ptdesc)){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #3: ffff888101eba8d8 (ptlock_ptr(ptdesc)){+.+.}-{2:2}, at: huge_pte_lock include/linux/hugetlb.h:1232 [inline] #3: ffff888101eba8d8 (ptlock_ptr(ptdesc)){+.+.}-{2:2}, at: __unmap_hugepage_range+0x14b/0x810 mm/hugetlb.c:5611 stack backtrace: CPU: 0 PID: 2670 Comm: syz-executor.0 Not tainted 6.8.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x5c/0xb0 lib/dump_stack.c:106 check_noncircular+0x118/0x130 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+0x1293/0x1a70 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0xcd/0x2d0 kernel/locking/lockdep.c:5719 __fs_reclaim_acquire mm/page_alloc.c:3692 [inline] fs_reclaim_acquire+0x9d/0xd0 mm/page_alloc.c:3706 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slub.c:3761 [inline] slab_alloc_node mm/slub.c:3842 [inline] kmalloc_trace+0x57/0x350 mm/slub.c:4007 kmalloc include/linux/slab.h:590 [inline] allocate_file_region_entries+0x9a/0x1c0 mm/hugetlb.c:666 region_chg+0x57/0x80 mm/hugetlb.c:786 __vma_reservation_common+0x12b/0x250 mm/hugetlb.c:2832 vma_needs_reservation mm/hugetlb.c:2899 [inline] __unmap_hugepage_range+0x4f2/0x810 mm/hugetlb.c:5681 unmap_vmas+0xe7/0x1c0 mm/memory.c:1758 exit_mmap+0x100/0x470 mm/mmap.c:3277 __mmput+0x3a/0x110 kernel/fork.c:1343 exit_mm kernel/exit.c:569 [inline] do_exit+0x2fa/0xb90 kernel/exit.c:858 do_group_exit+0x32/0xa0 kernel/exit.c:1020 __do_sys_exit_group kernel/exit.c:1031 [inline] __se_sys_exit_group kernel/exit.c:1029 [inline] __x64_sys_exit_group+0x13/0x20 kernel/exit.c:1029 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x84/0x180 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f3c0687cda9 Code: Unable to access opcode bytes at 0x7f3c0687cd7f. RSP: 002b:00007ffcec5f6f98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007f3c0687cda9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: 00007f3c069abf8c R09: 0000000000000000 R10: 0000001b30e60000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000