====================================================== WARNING: possible circular locking dependency detected 6.1.138-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.6962/31588 is trying to acquire lock: ffff88807aea44d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable+0x1d/0x60 include/linux/mmap_lock.h:126 but task is already holding lock: ffff888061e7e140 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] ffff888061e7e140 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: generic_file_write_iter+0x7f/0x2e0 mm/filemap.c:4003 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}: down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] process_measurement+0x33c/0x1a10 security/integrity/ima/ima_main.c:242 ima_file_mmap+0x104/0x150 security/integrity/ima/ima_main.c:429 __do_sys_remap_file_pages mm/mmap.c:3024 [inline] __se_sys_remap_file_pages+0x53e/0x770 mm/mmap.c:2956 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&mm->mmap_lock){++++}-{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+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 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:5333 [inline] lock_mm_and_find_vma+0x2b1/0x2f0 mm/memory.c:5384 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+0x1d2/0x560 mm/filemap.c:3836 __generic_file_write_iter+0x172/0x430 mm/filemap.c:3974 generic_file_write_iter+0xab/0x2e0 mm/filemap.c:4006 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x44c/0x960 fs/read_write.c:584 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 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(&sb->s_type->i_mutex_key#12); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#12); lock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz.0.6962/31588: #0: ffff88807bd9cd68 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2ae/0x360 fs/file.c:1040 #1: ffff888053e1a460 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x256/0x960 fs/read_write.c:580 #2: ffff888061e7e140 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #2: ffff888061e7e140 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: generic_file_write_iter+0x7f/0x2e0 mm/filemap.c:4003 stack backtrace: CPU: 1 PID: 31588 Comm: syz.0.6962 Not tainted 6.1.138-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 check_noncircular+0x274/0x310 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+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 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:5333 [inline] lock_mm_and_find_vma+0x2b1/0x2f0 mm/memory.c:5384 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 RIP: 0010:fault_in_readable+0x13e/0x1f0 mm/gup.c:1915 Code: 18 94 c3 ff 4d 89 f4 49 81 cc ff 0f 00 00 4d 89 f7 49 01 dc 49 81 e4 00 f0 ff ff 4d 39 e6 77 44 e8 f7 93 c3 ff 4d 39 e7 74 47 <41> 8a 07 88 44 24 07 49 81 c7 00 10 00 00 4d 39 e7 74 07 e8 da 93 RSP: 0018:ffffc9000c757a90 EFLAGS: 00050287 RAX: ffffffff81bd3fb9 RBX: 0000000000001000 RCX: 0000000000080000 RDX: ffffc9000f1bc000 RSI: 000000000004145c RDI: 000000000004145d RBP: 0000000000000000 R08: ffff888052030000 R09: 0000000000000002 R10: 0000000000000006 R11: 0000000000000002 R12: 0000200000321000 R13: dffffc0000000000 R14: 0000200000320000 R15: 0000200000320000 fault_in_iov_iter_readable+0xbb/0x2e0 lib/iov_iter.c:356 generic_perform_write+0x1d2/0x560 mm/filemap.c:3836 __generic_file_write_iter+0x172/0x430 mm/filemap.c:3974 generic_file_write_iter+0xab/0x2e0 mm/filemap.c:4006 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x44c/0x960 fs/read_write.c:584 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f281ab8e969 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:00007f281b961038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f281adb6080 RCX: 00007f281ab8e969 RDX: 000000000208e24b RSI: 0000200000000000 RDI: 0000000000000006 RBP: 00007f281ac10ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f281adb6080 R15: 00007ffd3e76cc38 ---------------- Code disassembly (best guess): 0: 18 94 c3 ff 4d 89 f4 sbb %dl,-0xb76b201(%rbx,%rax,8) 7: 49 81 cc ff 0f 00 00 or $0xfff,%r12 e: 4d 89 f7 mov %r14,%r15 11: 49 01 dc add %rbx,%r12 14: 49 81 e4 00 f0 ff ff and $0xfffffffffffff000,%r12 1b: 4d 39 e6 cmp %r12,%r14 1e: 77 44 ja 0x64 20: e8 f7 93 c3 ff call 0xffc3941c 25: 4d 39 e7 cmp %r12,%r15 28: 74 47 je 0x71 * 2a: 41 8a 07 mov (%r15),%al <-- trapping instruction 2d: 88 44 24 07 mov %al,0x7(%rsp) 31: 49 81 c7 00 10 00 00 add $0x1000,%r15 38: 4d 39 e7 cmp %r12,%r15 3b: 74 07 je 0x44 3d: e8 .byte 0xe8 3e: da .byte 0xda 3f: 93 xchg %eax,%ebx