====================================================== WARNING: possible circular locking dependency detected 6.6.0-rc4-next-20231003-syzkaller-dirty #0 Not tainted ------------------------------------------------------ syz-executor.0/5480 is trying to acquire lock: ffff8880156a0df8 (mapping.invalidate_lock#3){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:847 [inline] ffff8880156a0df8 (mapping.invalidate_lock#3){++++}-{3:3}, at: try_to_migrate_one+0x4ac/0x29e0 mm/rmap.c:1950 but task is already holding lock: ffff88807f7f58f8 (&anon_vma->rwsem){++++}-{3:3}, at: folio_lock_anon_vma_read+0x187/0xb20 mm/rmap.c:555 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&anon_vma->rwsem){++++}-{3:3}: down_write+0x93/0x200 kernel/locking/rwsem.c:1579 anon_vma_lock_write include/linux/rmap.h:121 [inline] __anon_vma_prepare+0xbd/0x550 mm/rmap.c:210 anon_vma_prepare include/linux/rmap.h:164 [inline] hugetlb_no_page mm/hugetlb.c:5812 [inline] hugetlb_fault+0x1d04/0x24a0 mm/hugetlb.c:5999 handle_mm_fault+0x905/0xa00 mm/memory.c:5430 do_user_addr_fault+0x3d1/0x1000 arch/x86/mm/fault.c:1413 handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x5c/0xd0 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 -> #0 (mapping.invalidate_lock#3){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 down_write+0x93/0x200 kernel/locking/rwsem.c:1579 filemap_invalidate_lock include/linux/fs.h:847 [inline] try_to_migrate_one+0x4ac/0x29e0 mm/rmap.c:1950 rmap_walk_anon+0x225/0x570 mm/rmap.c:2526 rmap_walk mm/rmap.c:2603 [inline] rmap_walk mm/rmap.c:2598 [inline] try_to_migrate+0x2b6/0x300 mm/rmap.c:2255 unmap_and_move_huge_page mm/migrate.c:1421 [inline] migrate_hugetlbs mm/migrate.c:1547 [inline] migrate_pages+0xa42/0x27c0 mm/migrate.c:1901 migrate_to_node mm/mempolicy.c:1097 [inline] do_migrate_pages+0x2e9/0x670 mm/mempolicy.c:1196 kernel_migrate_pages+0x59b/0x780 mm/mempolicy.c:1681 __do_sys_migrate_pages mm/mempolicy.c:1700 [inline] __se_sys_migrate_pages mm/mempolicy.c:1696 [inline] __x64_sys_migrate_pages+0x96/0x100 mm/mempolicy.c:1696 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&anon_vma->rwsem); lock(mapping.invalidate_lock#3); lock(&anon_vma->rwsem); lock(mapping.invalidate_lock#3); *** DEADLOCK *** 2 locks held by syz-executor.0/5480: #0: ffff888025bd1e20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:146 [inline] #0: ffff888025bd1e20 (&mm->mmap_lock){++++}-{3:3}, at: do_migrate_pages+0xc8/0x670 mm/mempolicy.c:1121 #1: ffff88807f7f58f8 (&anon_vma->rwsem){++++}-{3:3}, at: folio_lock_anon_vma_read+0x187/0xb20 mm/rmap.c:555 stack backtrace: CPU: 0 PID: 5480 Comm: syz-executor.0 Not tainted 6.6.0-rc4-next-20231003-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 check_noncircular+0x311/0x3f0 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:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 down_write+0x93/0x200 kernel/locking/rwsem.c:1579 filemap_invalidate_lock include/linux/fs.h:847 [inline] try_to_migrate_one+0x4ac/0x29e0 mm/rmap.c:1950 rmap_walk_anon+0x225/0x570 mm/rmap.c:2526 rmap_walk mm/rmap.c:2603 [inline] rmap_walk mm/rmap.c:2598 [inline] try_to_migrate+0x2b6/0x300 mm/rmap.c:2255 unmap_and_move_huge_page mm/migrate.c:1421 [inline] migrate_hugetlbs mm/migrate.c:1547 [inline] migrate_pages+0xa42/0x27c0 mm/migrate.c:1901 migrate_to_node mm/mempolicy.c:1097 [inline] do_migrate_pages+0x2e9/0x670 mm/mempolicy.c:1196 kernel_migrate_pages+0x59b/0x780 mm/mempolicy.c:1681 __do_sys_migrate_pages mm/mempolicy.c:1700 [inline] __se_sys_migrate_pages mm/mempolicy.c:1696 [inline] __x64_sys_migrate_pages+0x96/0x100 mm/mempolicy.c:1696 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fce6d67cae9 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:00007fce6e47d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000100 RAX: ffffffffffffffda RBX: 00007fce6d79bf80 RCX: 00007fce6d67cae9 RDX: 0000000020000000 RSI: 0000000000000004 RDI: 0000000000000000 RBP: 00007fce6d6c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fce6d79bf80 R15: 00007ffe82a8ede8