sctp: [Deprecated]: syz.9.4314 (pid 28585) Use of int in maxseg socket option. Use struct sctp_assoc_value instead loop9: detected capacity change from 0 to 4096 ====================================================== WARNING: possible circular locking dependency detected 6.1.122-syzkaller #0 Tainted: G W ------------------------------------------------------ syz.9.4314/28585 is trying to acquire lock: ffff88804bea9400 (mapping.invalidate_lock#6){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:813 [inline] ffff88804bea9400 (mapping.invalidate_lock#6){++++}-{3:3}, at: filemap_fault+0x640/0x17e0 mm/filemap.c:3219 but task is already holding lock: ffff88807de1f958 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] ffff88807de1f958 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline] ffff88807de1f958 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2e0 mm/memory.c:5382 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&mm->mmap_lock){++++}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __might_fault+0xbd/0x110 mm/memory.c:5851 _copy_to_user+0x26/0x130 lib/usercopy.c:36 copy_to_user include/linux/uaccess.h:169 [inline] ni_fiemap+0x1672/0x18a0 fs/ntfs3/frecord.c:2140 ntfs_fiemap+0x12e/0x170 fs/ntfs3/file.c:1254 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x18e9/0x2a90 fs/ioctl.c:810 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl+0x81/0x160 fs/ioctl.c:856 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 -> #1 (&ni->ni_lock/5){+.+.}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 ni_lock fs/ntfs3/ntfs_fs.h:1101 [inline] ntfs_fallocate+0x731/0x1020 fs/ntfs3/file.c:647 vfs_fallocate+0x547/0x6b0 fs/open.c:323 ksys_fallocate fs/open.c:346 [inline] __do_sys_fallocate fs/open.c:354 [inline] __se_sys_fallocate fs/open.c:352 [inline] __x64_sys_fallocate+0xb9/0x100 fs/open.c:352 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 (mapping.invalidate_lock#6){++++}-{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_read+0xad/0xa30 kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:813 [inline] filemap_fault+0x640/0x17e0 mm/filemap.c:3219 __do_fault+0x136/0x4f0 mm/memory.c:4278 do_read_fault mm/memory.c:4629 [inline] do_fault mm/memory.c:4758 [inline] handle_pte_fault mm/memory.c:5029 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x3410/0x5340 mm/memory.c:5292 do_user_addr_fault arch/x86/mm/fault.c:1340 [inline] handle_page_fault arch/x86/mm/fault.c:1431 [inline] exc_page_fault+0x26f/0x620 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 do_strncpy_from_user lib/strncpy_from_user.c:69 [inline] strncpy_from_user+0x26b/0x360 lib/strncpy_from_user.c:139 strncpy_from_sockptr include/linux/sockptr.h:134 [inline] do_tcp_setsockopt+0x184/0x2320 net/ipv4/tcp.c:3553 __sys_setsockopt+0x57e/0xa00 net/socket.c:2288 __do_sys_setsockopt net/socket.c:2299 [inline] __se_sys_setsockopt net/socket.c:2296 [inline] __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2296 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: Chain exists of: mapping.invalidate_lock#6 --> &ni->ni_lock/5 --> &mm->mmap_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_lock); lock(&ni->ni_lock/5); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#6); *** DEADLOCK *** 1 lock held by syz.9.4314/28585: #0: ffff88807de1f958 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] #0: ffff88807de1f958 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline] #0: ffff88807de1f958 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x2e/0x2e0 mm/memory.c:5382 stack backtrace: CPU: 0 PID: 28585 Comm: syz.9.4314 Tainted: G W 6.1.122-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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_read+0xad/0xa30 kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:813 [inline] filemap_fault+0x640/0x17e0 mm/filemap.c:3219 __do_fault+0x136/0x4f0 mm/memory.c:4278 do_read_fault mm/memory.c:4629 [inline] do_fault mm/memory.c:4758 [inline] handle_pte_fault mm/memory.c:5029 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x3410/0x5340 mm/memory.c:5292 do_user_addr_fault arch/x86/mm/fault.c:1340 [inline] handle_page_fault arch/x86/mm/fault.c:1431 [inline] exc_page_fault+0x26f/0x620 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:72 [inline] RIP: 0010:strncpy_from_user+0x26b/0x360 lib/strncpy_from_user.c:139 Code: 01 f5 e9 90 00 00 00 e8 c3 70 1b fd 48 f7 dd 49 89 ed 48 89 dd 4c 8b 7c 24 10 31 ff 48 89 ee e8 8b 74 1b fd 48 83 ed 01 72 43 <43> 8a 1c 2c 4b 8d 3c 2e 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 RSP: 0018:ffffc90003a77c28 EFLAGS: 00050202 RAX: 0000000000000002 RBX: 00007fffffffeffb RCX: ffff888029edd940 RDX: ffffc900186e0000 RSI: 0000000000000005 RDI: 0000000000000000 RBP: 0000000000000004 R08: ffffffff846f2bc5 R09: ffffffff81eeefd3 R10: 0000000000000003 R11: ffff888029edd940 R12: 00000000200001c0 R13: 0000000000000000 R14: ffffc90003a77cf0 R15: 0000000000000005 strncpy_from_sockptr include/linux/sockptr.h:134 [inline] do_tcp_setsockopt+0x184/0x2320 net/ipv4/tcp.c:3553 __sys_setsockopt+0x57e/0xa00 net/socket.c:2288 __do_sys_setsockopt net/socket.c:2299 [inline] __se_sys_setsockopt net/socket.c:2296 [inline] __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2296 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: 0033:0x7f7b0d985d29 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:00007f7b0e756038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f7b0db75fa0 RCX: 00007f7b0d985d29 RDX: 000000000000000d RSI: 0000000000000006 RDI: 000000000000000b RBP: 00007f7b0da01b08 R08: 0000000000000005 R09: 0000000000000000 R10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f7b0db75fa0 R15: 00007ffdc65a0808 ---------------- Code disassembly (best guess): 0: 01 f5 add %esi,%ebp 2: e9 90 00 00 00 jmp 0x97 7: e8 c3 70 1b fd call 0xfd1b70cf c: 48 f7 dd neg %rbp f: 49 89 ed mov %rbp,%r13 12: 48 89 dd mov %rbx,%rbp 15: 4c 8b 7c 24 10 mov 0x10(%rsp),%r15 1a: 31 ff xor %edi,%edi 1c: 48 89 ee mov %rbp,%rsi 1f: e8 8b 74 1b fd call 0xfd1b74af 24: 48 83 ed 01 sub $0x1,%rbp 28: 72 43 jb 0x6d * 2a: 43 8a 1c 2c mov (%r12,%r13,1),%bl <-- trapping instruction 2e: 4b 8d 3c 2e lea (%r14,%r13,1),%rdi 32: 48 89 f8 mov %rdi,%rax 35: 48 c1 e8 03 shr $0x3,%rax 39: 48 rex.W 3a: b9 00 00 00 00 mov $0x0,%ecx