======================================================
WARNING: possible circular locking dependency detected
6.16.0-rc6-syzkaller-00279-gbf61759db409 #0 Not tainted
------------------------------------------------------
syz.1.5054/19923 is trying to acquire lock:
ffff8880333bc7e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable include/linux/mmap_lock.h:421 [inline]
ffff8880333bc7e0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:197 [inline]
ffff8880333bc7e0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x3e7/0x6e0 mm/mmap_lock.c:248
but task is already holding lock:
ffff8880478bbe58 (&sb->s_type->i_mutex_key#34){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:899 [inline]
ffff8880478bbe58 (&sb->s_type->i_mutex_key#34){+.+.}-{4:4}, at: ntfs_file_write_iter+0xdf/0x2120 fs/ntfs3/file.c:1160
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&sb->s_type->i_mutex_key#34){+.+.}-{4:4}:
down_write+0x92/0x200 kernel/locking/rwsem.c:1577
inode_lock include/linux/fs.h:869 [inline]
ntfs_file_mmap+0x60c/0x780 fs/ntfs3/file.c:313
call_mmap include/linux/fs.h:2286 [inline]
mmap_file mm/internal.h:167 [inline]
__mmap_new_file_vma mm/vma.c:2405 [inline]
__mmap_new_vma mm/vma.c:2467 [inline]
__mmap_region+0x128e/0x25e0 mm/vma.c:2622
mmap_region+0x32b/0x3f0 mm/vma.c:2692
do_mmap+0xa3e/0x1210 mm/mmap.c:561
vm_mmap_pgoff+0x281/0x450 mm/util.c:579
ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:607
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&mm->mmap_lock){++++}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3168 [inline]
check_prevs_add kernel/locking/lockdep.c:3287 [inline]
validate_chain kernel/locking/lockdep.c:3911 [inline]
__lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240
lock_acquire kernel/locking/lockdep.c:5871 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828
down_read_killable+0x9e/0x4b0 kernel/locking/rwsem.c:1547
mmap_read_lock_killable include/linux/mmap_lock.h:421 [inline]
get_mmap_lock_carefully mm/mmap_lock.c:197 [inline]
lock_mm_and_find_vma+0x3e7/0x6e0 mm/mmap_lock.c:248
do_user_addr_fault+0x2ac/0x1370 arch/x86/mm/fault.c:1359
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
fault_in_readable+0x135/0x1d0 mm/gup.c:2227
fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:94
ntfs_compress_write fs/ntfs3/file.c:1026 [inline]
ntfs_file_write_iter+0x1210/0x2120 fs/ntfs3/file.c:1196
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x6c7/0x1150 fs/read_write.c:686
ksys_pwrite64 fs/read_write.c:793 [inline]
__do_sys_pwrite64 fs/read_write.c:801 [inline]
__se_sys_pwrite64 fs/read_write.c:798 [inline]
__x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:798
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sb->s_type->i_mutex_key#34);
lock(&mm->mmap_lock);
lock(&sb->s_type->i_mutex_key#34);
rlock(&mm->mmap_lock);
*** DEADLOCK ***
2 locks held by syz.1.5054/19923:
#0: ffff8880395a8428 (sb_writers#12){.+.+}-{0:0}, at: ksys_pwrite64 fs/read_write.c:793 [inline]
#0: ffff8880395a8428 (sb_writers#12){.+.+}-{0:0}, at: __do_sys_pwrite64 fs/read_write.c:801 [inline]
#0: ffff8880395a8428 (sb_writers#12){.+.+}-{0:0}, at: __se_sys_pwrite64 fs/read_write.c:798 [inline]
#0: ffff8880395a8428 (sb_writers#12){.+.+}-{0:0}, at: __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:798
#1: ffff8880478bbe58 (&sb->s_type->i_mutex_key#34){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:899 [inline]
#1: ffff8880478bbe58 (&sb->s_type->i_mutex_key#34){+.+.}-{4:4}, at: ntfs_file_write_iter+0xdf/0x2120 fs/ntfs3/file.c:1160
stack backtrace:
CPU: 1 UID: 0 PID: 19923 Comm: syz.1.5054 Not tainted 6.16.0-rc6-syzkaller-00279-gbf61759db409 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2046
check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2178
check_prev_add kernel/locking/lockdep.c:3168 [inline]
check_prevs_add kernel/locking/lockdep.c:3287 [inline]
validate_chain kernel/locking/lockdep.c:3911 [inline]
__lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240
lock_acquire kernel/locking/lockdep.c:5871 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828
down_read_killable+0x9e/0x4b0 kernel/locking/rwsem.c:1547
mmap_read_lock_killable include/linux/mmap_lock.h:421 [inline]
get_mmap_lock_carefully mm/mmap_lock.c:197 [inline]
lock_mm_and_find_vma+0x3e7/0x6e0 mm/mmap_lock.c:248
do_user_addr_fault+0x2ac/0x1370 arch/x86/mm/fault.c:1359
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:fault_in_readable+0x135/0x1d0 mm/gup.c:2227
Code: 11 27 b9 ff 48 85 db 0f 84 9c 00 00 00 e8 93 2b b9 ff 48 89 de 48 89 ef e8 38 26 b9 ff 48 39 eb 73 1d e8 7e 2b b9 ff 45 89 f7 <8a> 03 31 ff 44 89 fe 88 44 24 28 e8 ab 26 b9 ff 45 85 ff 74 a8 e8
RSP: 0018:ffffc90003e1fac8 EFLAGS: 00050287
RAX: 0000000000038863 RBX: 0000200000009000 RCX: ffffc9000e8f9000
RDX: 0000000000080000 RSI: ffffffff8202bc82 RDI: 0000000000000006
RBP: 000020000000ff2f R08: 0000000000000006 R09: 000020000000ff2f
R10: 0000200000009000 R11: 0000000000000001 R12: 0000200000000274
R13: 000000000000fcbb R14: 0000000000000000 R15: 0000000000000000
fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:94
ntfs_compress_write fs/ntfs3/file.c:1026 [inline]
ntfs_file_write_iter+0x1210/0x2120 fs/ntfs3/file.c:1196
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x6c7/0x1150 fs/read_write.c:686
ksys_pwrite64 fs/read_write.c:793 [inline]
__do_sys_pwrite64 fs/read_write.c:801 [inline]
__se_sys_pwrite64 fs/read_write.c:798 [inline]
__x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:798
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f996158e9a9
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:00007f99623f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f99617b5fa0 RCX: 00007f996158e9a9
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000005
RBP: 00007f9961610d69 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fecc R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f99617b5fa0 R15: 00007ffcf39cee18
</TASK>
----------------
Code disassembly (best guess):
0: 11 27 adc %esp,(%rdi)
2: b9 ff 48 85 db mov $0xdb8548ff,%ecx
7: 0f 84 9c 00 00 00 je 0xa9
d: e8 93 2b b9 ff call 0xffb92ba5
12: 48 89 de mov %rbx,%rsi
15: 48 89 ef mov %rbp,%rdi
18: e8 38 26 b9 ff call 0xffb92655
1d: 48 39 eb cmp %rbp,%rbx
20: 73 1d jae 0x3f
22: e8 7e 2b b9 ff call 0xffb92ba5
27: 45 89 f7 mov %r14d,%r15d
* 2a: 8a 03 mov (%rbx),%al <-- trapping instruction
2c: 31 ff xor %edi,%edi
2e: 44 89 fe mov %r15d,%esi
31: 88 44 24 28 mov %al,0x28(%rsp)
35: e8 ab 26 b9 ff call 0xffb926e5
3a: 45 85 ff test %r15d,%r15d
3d: 74 a8 je 0xffffffe7
3f: e8 .byte 0xe8