mmap: syz.1.639 (6959) uses deprecated remap_file_pages() syscall. See Documentation/mm/remap_file_pages.rst. ====================================================== WARNING: possible circular locking dependency detected 6.1.120-syzkaller-00773-g52f863f820fd #0 Tainted: G W ------------------------------------------------------ syz.1.639/6959 is trying to acquire lock: ffff888052797430 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] ffff888052797430 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: process_measurement+0x446/0x21b0 security/integrity/ima/ima_main.c:242 but task is already holding lock: ffff8880309f44d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] ffff8880309f44d8 (&mm->mmap_lock){++++}-{3:3}, at: __do_sys_remap_file_pages mm/mmap.c:2981 [inline] ffff8880309f44d8 (&mm->mmap_lock){++++}-{3:3}, at: __se_sys_remap_file_pages+0x207/0x8b0 mm/mmap.c:2956 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&mm->mmap_lock){++++}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 down_read_killable+0xc6/0xd10 kernel/locking/rwsem.c:1543 mmap_read_lock_killable+0x1d/0x60 include/linux/mmap_lock.h:126 get_mmap_lock_carefully mm/memory.c:5331 [inline] lock_mm_and_find_vma+0x2a7/0x2e0 mm/memory.c:5382 do_user_addr_fault arch/x86/mm/fault.c:1312 [inline] handle_page_fault arch/x86/mm/fault.c:1431 [inline] exc_page_fault+0x169/0x620 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 fault_in_readable+0x1c8/0x340 fault_in_iov_iter_readable+0xdb/0x270 lib/iov_iter.c:356 generic_perform_write+0x207/0x5e0 mm/filemap.c:3835 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3973 generic_file_write_iter+0xab/0x310 mm/filemap.c:4005 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x857/0xbc0 fs/read_write.c:584 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] process_measurement+0x446/0x21b0 security/integrity/ima/ima_main.c:242 ima_file_mmap+0x121/0x1c0 security/integrity/ima/ima_main.c:429 __do_sys_remap_file_pages mm/mmap.c:3024 [inline] __se_sys_remap_file_pages+0x67a/0x8b0 mm/mmap.c:2956 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#12); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#12); *** DEADLOCK *** 1 lock held by syz.1.639/6959: #0: ffff8880309f44d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #0: ffff8880309f44d8 (&mm->mmap_lock){++++}-{3:3}, at: __do_sys_remap_file_pages mm/mmap.c:2981 [inline] #0: ffff8880309f44d8 (&mm->mmap_lock){++++}-{3:3}, at: __se_sys_remap_file_pages+0x207/0x8b0 mm/mmap.c:2956 stack backtrace: CPU: 0 PID: 6959 Comm: syz.1.639 Tainted: G W 6.1.120-syzkaller-00773-g52f863f820fd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] process_measurement+0x446/0x21b0 security/integrity/ima/ima_main.c:242 ima_file_mmap+0x121/0x1c0 security/integrity/ima/ima_main.c:429 __do_sys_remap_file_pages mm/mmap.c:3024 [inline] __se_sys_remap_file_pages+0x67a/0x8b0 mm/mmap.c:2956 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fa108385d19 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:00007fa10925f038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d8 RAX: ffffffffffffffda RBX: 00007fa108575fa0 RCX: 00007fa108385d19 RDX: 0000000000000000 RSI: 0000000000200000 RDI: 00000000202ec000 RBP: 00007fa108401a20 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa108575fa0 R15: 00007fff2ab036e8