====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.5.1485/10967 is trying to acquire lock: ffff88807a269058 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable+0x1d/0x60 include/linux/mmap_lock.h:126 but task is already holding lock: ffff888068ca1bd0 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:764 [inline] ffff888068ca1bd0 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: generic_file_write_iter+0x7f/0x2e0 mm/filemap.c:3986 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}: down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:764 [inline] process_measurement+0x3af/0x1c40 security/integrity/ima/ima_main.c:242 ima_file_mmap+0xe9/0x140 security/integrity/ima/ima_main.c:429 __do_sys_remap_file_pages mm/mmap.c:3036 [inline] __se_sys_remap_file_pages+0x55a/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 -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3a03/0x7ea0 kernel/locking/lockdep.c:5171 lock_acquire+0x1bc/0x4a0 kernel/locking/lockdep.c:5790 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+0x2e8/0xb20 arch/x86/mm/fault.c:1310 handle_page_fault arch/x86/mm/fault.c:1429 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482 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+0xbf/0x2f0 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:2271 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x482/0x9a0 fs/read_write.c:584 ksys_write+0x14d/0x260 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 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#13); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#13); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz.5.1485/10967: #0: ffff8880240e1268 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2ae/0x360 fs/file.c:1038 #1: ffff888053a0c460 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x270/0x9a0 fs/read_write.c:580 #2: ffff888068ca1bd0 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:764 [inline] #2: ffff888068ca1bd0 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: generic_file_write_iter+0x7f/0x2e0 mm/filemap.c:3986 stack backtrace: CPU: 1 PID: 10967 Comm: syz.5.1485 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x2f8/0x400 kernel/locking/lockdep.c:2215 check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3a03/0x7ea0 kernel/locking/lockdep.c:5171 lock_acquire+0x1bc/0x4a0 kernel/locking/lockdep.c:5790 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+0x2e8/0xb20 arch/x86/mm/fault.c:1310 handle_page_fault arch/x86/mm/fault.c:1429 [inline] exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482 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: 68 2b c4 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 47 2b c4 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 2a 2b RSP: 0018:ffffc9000572fab0 EFLAGS: 00050287 RAX: ffffffff81be1b39 RBX: 0000000000001000 RCX: 0000000000080000 RDX: ffffc9001c5c6000 RSI: 0000000000028c80 RDI: 0000000000028c81 RBP: 0000000000000000 R08: ffff88802ccdbc00 R09: 0000000000000002 R10: 0000000000000006 R11: 0000000000000002 R12: 0000200000172000 R13: dffffc0000000000 R14: 0000200000171000 R15: 0000200000171000 fault_in_iov_iter_readable+0xbf/0x2f0 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:2271 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x482/0x9a0 fs/read_write.c:584 ksys_write+0x14d/0x260 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 RIP: 0033:0x7f4da8b9e159 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:00007f4da99c8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f4da8e25fa0 RCX: 00007f4da8b9e159 RDX: 000000000208e24b RSI: 0000200000000000 RDI: 0000000000000005 RBP: 00007f4da8c3506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4da8e26038 R14: 00007f4da8e25fa0 R15: 00007ffc26e85598 ---------------- Code disassembly (best guess): 0: 68 2b c4 ff 4d push $0x4dffc42b 5: 89 f4 mov %esi,%esp 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 47 2b c4 ff call 0xffc42b6c 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: 2a 2b sub (%rbx),%ch