====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.4.1836/12929 is trying to acquire lock: ffff88807b2fbb60 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] ffff88807b2fbb60 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: process_measurement+0x3a2/0x1c30 security/integrity/ima/ima_main.c:242 but task is already holding lock: ffff88807de49058 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] ffff88807de49058 (&mm->mmap_lock){++++}-{3:3}, at: __do_sys_remap_file_pages mm/mmap.c:2993 [inline] ffff88807de49058 (&mm->mmap_lock){++++}-{3:3}, at: __se_sys_remap_file_pages+0x1a4/0x7b0 mm/mmap.c:2968 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&mm->mmap_lock){++++}-{3:3}: down_read_killable+0x4c/0x340 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+0x2b1/0x2f0 mm/memory.c:5382 do_user_addr_fault+0x2db/0xb10 arch/x86/mm/fault.c:1312 handle_page_fault arch/x86/mm/fault.c:1431 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 fault_in_readable+0x13e/0x1f0 mm/gup.c:1914 fault_in_iov_iter_readable+0xbb/0x2e0 lib/iov_iter.c:356 generic_perform_write+0x1f1/0x5c0 mm/filemap.c:3852 __generic_file_write_iter+0x148/0x2a0 mm/filemap.c:3960 generic_file_write_iter+0xab/0x2e0 mm/filemap.c:3989 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x4b1/0xa30 fs/read_write.c:584 ksys_write+0x14c/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] process_measurement+0x3a2/0x1c30 security/integrity/ima/ima_main.c:242 ima_file_mmap+0x102/0x150 security/integrity/ima/ima_main.c:429 __do_sys_remap_file_pages mm/mmap.c:3036 [inline] __se_sys_remap_file_pages+0x559/0x7b0 mm/mmap.c:2968 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 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#13); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#13); *** DEADLOCK *** 1 lock held by syz.4.1836/12929: #0: ffff88807de49058 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline] #0: ffff88807de49058 (&mm->mmap_lock){++++}-{3:3}, at: __do_sys_remap_file_pages mm/mmap.c:2993 [inline] #0: ffff88807de49058 (&mm->mmap_lock){++++}-{3:3}, at: __se_sys_remap_file_pages+0x1a4/0x7b0 mm/mmap.c:2968 stack backtrace: CPU: 1 PID: 12929 Comm: syz.4.1836 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x296/0x330 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 kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] process_measurement+0x3a2/0x1c30 security/integrity/ima/ima_main.c:242 ima_file_mmap+0x102/0x150 security/integrity/ima/ima_main.c:429 __do_sys_remap_file_pages mm/mmap.c:3036 [inline] __se_sys_remap_file_pages+0x559/0x7b0 mm/mmap.c:2968 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f7d7899acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7d798a5028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d8 RAX: ffffffffffffffda RBX: 00007f7d78c15fa0 RCX: 00007f7d7899acb9 RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000200000640000 RBP: 00007f7d78a08bf7 R08: 0000000000020000 R09: 0000000000000000 R10: fffffffffffffffd R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7d78c16038 R14: 00007f7d78c15fa0 R15: 00007ffd9b24ecc8