mmap: syz.0.190 (5991) uses deprecated remap_file_pages() syscall. See Documentation/mm/remap_file_pages.rst. ====================================================== WARNING: possible circular locking dependency detected 6.11.0-syzkaller-11558-g075dbe9f6e3c #0 Not tainted ------------------------------------------------------ syz.0.190/5991 is trying to acquire lock: ffff888040b35e38 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] ffff888040b35e38 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: process_measurement+0x39c/0x2370 security/integrity/ima/ima_main.c:250 but task is already holding lock: ffff88802862cd98 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:122 [inline] ffff88802862cd98 (&mm->mmap_lock){++++}-{3:3}, at: __do_sys_remap_file_pages+0x184/0x900 mm/mmap.c:1649 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+0x9d/0x380 kernel/locking/rwsem.c:1549 mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline] get_mmap_lock_carefully mm/memory.c:6108 [inline] lock_mm_and_find_vma+0x3a9/0x6a0 mm/memory.c:6159 do_user_addr_fault+0x2b5/0x13f0 arch/x86/mm/fault.c:1361 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 fault_in_readable+0x126/0x230 mm/gup.c:2235 fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:94 generic_perform_write+0x21b/0x920 mm/filemap.c:4040 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3221 new_sync_write fs/read_write.c:590 [inline] vfs_write+0x6b5/0x1140 fs/read_write.c:683 ksys_write+0x12f/0x260 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3158 [inline] check_prevs_add kernel/locking/lockdep.c:3277 [inline] validate_chain kernel/locking/lockdep.c:3901 [inline] __lock_acquire+0x250b/0x3ce0 kernel/locking/lockdep.c:5199 lock_acquire kernel/locking/lockdep.c:5822 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5787 down_write+0x93/0x200 kernel/locking/rwsem.c:1579 inode_lock include/linux/fs.h:815 [inline] process_measurement+0x39c/0x2370 security/integrity/ima/ima_main.c:250 ima_file_mmap+0x146/0x1d0 security/integrity/ima/ima_main.c:455 security_mmap_file+0x8bd/0x990 security/security.c:2977 __do_sys_remap_file_pages+0x526/0x900 mm/mmap.c:1692 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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.0.190/5991: #0: ffff88802862cd98 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:122 [inline] #0: ffff88802862cd98 (&mm->mmap_lock){++++}-{3:3}, at: __do_sys_remap_file_pages+0x184/0x900 mm/mmap.c:1649 stack backtrace: CPU: 1 UID: 0 PID: 5991 Comm: syz.0.190 Not tainted 6.11.0-syzkaller-11558-g075dbe9f6e3c #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2203 check_prev_add kernel/locking/lockdep.c:3158 [inline] check_prevs_add kernel/locking/lockdep.c:3277 [inline] validate_chain kernel/locking/lockdep.c:3901 [inline] __lock_acquire+0x250b/0x3ce0 kernel/locking/lockdep.c:5199 lock_acquire kernel/locking/lockdep.c:5822 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5787 down_write+0x93/0x200 kernel/locking/rwsem.c:1579 inode_lock include/linux/fs.h:815 [inline] process_measurement+0x39c/0x2370 security/integrity/ima/ima_main.c:250 ima_file_mmap+0x146/0x1d0 security/integrity/ima/ima_main.c:455 security_mmap_file+0x8bd/0x990 security/security.c:2977 __do_sys_remap_file_pages+0x526/0x900 mm/mmap.c:1692 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa31ef7df39 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:00007fa31fd89038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d8 RAX: ffffffffffffffda RBX: 00007fa31f135f80 RCX: 00007fa31ef7df39 RDX: 0000000000000000 RSI: 0000000000800000 RDI: 0000000020800000 RBP: 00007fa31eff0216 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa31f135f80 R15: 00007fff80089bf8