====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.2.22/5989 is trying to acquire lock: ffff8881bc18d318 (&hugetlbfs_i_mmap_rwsem_key){+.+.}-{4:4}, at: i_mmap_lock_write include/linux/fs.h:548 [inline] ffff8881bc18d318 (&hugetlbfs_i_mmap_rwsem_key){+.+.}-{4:4}, at: hugetlb_unmap_file_folio fs/hugetlbfs/inode.c:451 [inline] ffff8881bc18d318 (&hugetlbfs_i_mmap_rwsem_key){+.+.}-{4:4}, at: remove_inode_single_folio fs/hugetlbfs/inode.c:535 [inline] ffff8881bc18d318 (&hugetlbfs_i_mmap_rwsem_key){+.+.}-{4:4}, at: remove_inode_hugepages+0x972/0x1110 fs/hugetlbfs/inode.c:602 but task is already holding lock: ffff8881ae823178 (&vma_lock->rw_sema){++++}-{4:4}, at: hugetlb_unmap_file_folio fs/hugetlbfs/inode.c:450 [inline] ffff8881ae823178 (&vma_lock->rw_sema){++++}-{4:4}, at: remove_inode_single_folio fs/hugetlbfs/inode.c:535 [inline] ffff8881ae823178 (&vma_lock->rw_sema){++++}-{4:4}, at: remove_inode_hugepages+0x96a/0x1110 fs/hugetlbfs/inode.c:602 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&vma_lock->rw_sema){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1590 hugetlb_zap_begin include/linux/hugetlb.h:257 [inline] unmap_vmas+0x23d/0x580 mm/memory.c:2098 exit_mmap+0x23e/0xb30 mm/mmap.c:1277 __mmput+0x118/0x430 kernel/fork.c:1133 exit_mm+0x1da/0x2c0 kernel/exit.c:582 do_exit+0x648/0x2300 kernel/exit.c:954 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107 get_signal+0x1285/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&hugetlbfs_i_mmap_rwsem_key){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1590 i_mmap_lock_write include/linux/fs.h:548 [inline] hugetlb_unmap_file_folio fs/hugetlbfs/inode.c:451 [inline] remove_inode_single_folio fs/hugetlbfs/inode.c:535 [inline] remove_inode_hugepages+0x972/0x1110 fs/hugetlbfs/inode.c:602 hugetlbfs_punch_hole fs/hugetlbfs/inode.c:725 [inline] hugetlbfs_fallocate+0xbc2/0x1100 fs/hugetlbfs/inode.c:751 vfs_fallocate+0x669/0x7e0 fs/open.c:342 madvise_remove mm/madvise.c:1046 [inline] madvise_vma_behavior+0x341a/0x3d70 mm/madvise.c:1350 madvise_walk_vmas+0x51c/0xa30 mm/madvise.c:1673 madvise_do_behavior+0x38e/0x550 mm/madvise.c:1889 do_madvise+0x1bc/0x270 mm/madvise.c:1982 __do_sys_madvise mm/madvise.c:1991 [inline] __se_sys_madvise mm/madvise.c:1989 [inline] __x64_sys_madvise+0xa7/0xc0 mm/madvise.c:1989 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&vma_lock->rw_sema); lock(&hugetlbfs_i_mmap_rwsem_key); lock(&vma_lock->rw_sema); lock(&hugetlbfs_i_mmap_rwsem_key); *** DEADLOCK *** 4 locks held by syz.2.22/5989: #0: ffff8881056ac420 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3111 [inline] #0: ffff8881056ac420 (sb_writers#12){.+.+}-{0:0}, at: vfs_fallocate+0x5f0/0x7e0 fs/open.c:341 #1: ffff8881bc18d048 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #1: ffff8881bc18d048 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:693 [inline] #1: ffff8881bc18d048 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: hugetlbfs_fallocate+0x3cc/0x1100 fs/hugetlbfs/inode.c:751 #2: ffff888103e8e4e8 (&hugetlb_fault_mutex_table[i]){+.+.}-{4:4}, at: remove_inode_hugepages+0x332/0x1110 fs/hugetlbfs/inode.c:597 #3: ffff8881ae823178 (&vma_lock->rw_sema){++++}-{4:4}, at: hugetlb_unmap_file_folio fs/hugetlbfs/inode.c:450 [inline] #3: ffff8881ae823178 (&vma_lock->rw_sema){++++}-{4:4}, at: remove_inode_single_folio fs/hugetlbfs/inode.c:535 [inline] #3: ffff8881ae823178 (&vma_lock->rw_sema){++++}-{4:4}, at: remove_inode_hugepages+0x96a/0x1110 fs/hugetlbfs/inode.c:602 stack backtrace: CPU: 1 UID: 0 PID: 5989 Comm: syz.2.22 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1590 i_mmap_lock_write include/linux/fs.h:548 [inline] hugetlb_unmap_file_folio fs/hugetlbfs/inode.c:451 [inline] remove_inode_single_folio fs/hugetlbfs/inode.c:535 [inline] remove_inode_hugepages+0x972/0x1110 fs/hugetlbfs/inode.c:602 hugetlbfs_punch_hole fs/hugetlbfs/inode.c:725 [inline] hugetlbfs_fallocate+0xbc2/0x1100 fs/hugetlbfs/inode.c:751 vfs_fallocate+0x669/0x7e0 fs/open.c:342 madvise_remove mm/madvise.c:1046 [inline] madvise_vma_behavior+0x341a/0x3d70 mm/madvise.c:1350 madvise_walk_vmas+0x51c/0xa30 mm/madvise.c:1673 madvise_do_behavior+0x38e/0x550 mm/madvise.c:1889 do_madvise+0x1bc/0x270 mm/madvise.c:1982 __do_sys_madvise mm/madvise.c:1991 [inline] __se_sys_madvise mm/madvise.c:1989 [inline] __x64_sys_madvise+0xa7/0xc0 mm/madvise.c:1989 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fca36b8efc9 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:00007fca37a80038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007fca36de6090 RCX: 00007fca36b8efc9 RDX: 0000000000000009 RSI: 0000000000600000 RDI: 0000200000bc0000 RBP: 00007fca36c11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fca36de6128 R14: 00007fca36de6090 R15: 00007ffeef05aaf8