exFAT-fs (loop6): failed to load alloc-bitmap
exFAT-fs (loop6): failed to recognize exfat type
loop6: detected capacity change from 0 to 4096
ntfs3(loop6): ino=5, "/" mi_enum_attr
======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc1-syzkaller-00081-gbb066fe812d6 #0 Not tainted
------------------------------------------------------
syz.6.717/13207 is trying to acquire lock:
ffff88805968f6e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:199
but task is already holding lock:
ffff88804c9499a0 (&sb->s_type->i_mutex_key#31){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:885 [inline]
ffff88804c9499a0 (&sb->s_type->i_mutex_key#31){+.+.}-{4:4}, at: ntfs_file_write_iter+0x294/0x7e0 fs/ntfs3/file.c:1240
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&sb->s_type->i_mutex_key#31){+.+.}-{4:4}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
down_write+0x99/0x220 kernel/locking/rwsem.c:1577
inode_lock include/linux/fs.h:865 [inline]
ntfs_file_mmap+0x5bc/0x850 fs/ntfs3/file.c:379
call_mmap include/linux/fs.h:2233 [inline]
mmap_file mm/internal.h:124 [inline]
__mmap_new_file_vma mm/vma.c:2292 [inline]
__mmap_new_vma mm/vma.c:2356 [inline]
__mmap_region mm/vma.c:2457 [inline]
mmap_region+0x245e/0x2f80 mm/vma.c:2535
do_mmap+0xecc/0x13a0 mm/mmap.c:561
vm_mmap_pgoff+0x214/0x430 mm/util.c:575
ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:607
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&mm->mmap_lock){++++}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:199
get_mmap_lock_carefully mm/memory.c:6247 [inline]
lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6298
do_user_addr_fault arch/x86/mm/fault.c:1360 [inline]
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x1bf/0x8b0 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
fault_in_readable+0x173/0x2d0
fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94
ntfs_compress_write+0x110b/0x2170 fs/ntfs3/file.c:1095
ntfs_file_write_iter+0x697/0x7e0 fs/ntfs3/file.c:1266
new_sync_write fs/read_write.c:586 [inline]
vfs_write+0xacf/0xd10 fs/read_write.c:679
ksys_write+0x18f/0x2b0 fs/read_write.c:731
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 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(&sb->s_type->i_mutex_key#31);
lock(&mm->mmap_lock);
lock(&sb->s_type->i_mutex_key#31);
rlock(&mm->mmap_lock);
*** DEADLOCK ***
3 locks held by syz.6.717/13207:
#0: ffff888029a82638 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x254/0x320 fs/file.c:1192
#1: ffff8880329e8420 (sb_writers#25){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3023 [inline]
#1: ffff8880329e8420 (sb_writers#25){.+.+}-{0:0}, at: vfs_write+0x225/0xd10 fs/read_write.c:675
#2: ffff88804c9499a0 (&sb->s_type->i_mutex_key#31){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:885 [inline]
#2: ffff88804c9499a0 (&sb->s_type->i_mutex_key#31){+.+.}-{4:4}, at: ntfs_file_write_iter+0x294/0x7e0 fs/ntfs3/file.c:1240
stack backtrace:
CPU: 1 UID: 0 PID: 13207 Comm: syz.6.717 Not tainted 6.14.0-rc1-syzkaller-00081-gbb066fe812d6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:199
get_mmap_lock_carefully mm/memory.c:6247 [inline]
lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6298
do_user_addr_fault arch/x86/mm/fault.c:1360 [inline]
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x1bf/0x8b0 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:fault_in_readable+0x173/0x2d0 mm/gup.c:2241
Code: 00 fc ff df 4c 89 e8 4f 8d ac 25 ff 0f 00 00 49 81 e5 00 f0 ff ff 49 39 c5 72 7a e8 27 7f b7 ff 4c 39 eb 74 7d 4c 89 64 24 08 <44> 8a 23 43 0f b6 04 3e 84 c0 75 18 44 88 64 24 40 48 81 c3 00 10
RSP: 0000:ffffc900044cf980 EFLAGS: 00050287
RAX: ffffffff8207de99 RBX: 0000200000021000 RCX: 0000000000080000
RDX: ffffc9000d319000 RSI: 0000000000031888 RDI: 0000000000031889
RBP: ffffc900044cfa38 R08: ffffffff8207de2c R09: ffffffff84de5179
R10: 0000000000000002 R11: ffff88802fea0000 R12: 0000000000010000
R13: 0000200000031000 R14: 1ffff92000899f38 R15: dffffc0000000000
fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94
ntfs_compress_write+0x110b/0x2170 fs/ntfs3/file.c:1095
ntfs_file_write_iter+0x697/0x7e0 fs/ntfs3/file.c:1266
new_sync_write fs/read_write.c:586 [inline]
vfs_write+0xacf/0xd10 fs/read_write.c:679
ksys_write+0x18f/0x2b0 fs/read_write.c:731
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f064e98cde9
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:00007f064f71e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f064eba5fa0 RCX: 00007f064e98cde9
RDX: 00000000fffffdef RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007f064ea0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f064eba5fa0 R15: 00007ffda2aee4e8
</TASK>
----------------
Code disassembly (best guess), 3 bytes skipped:
0: df 4c 89 e8 fisttps -0x18(%rcx,%rcx,4)
4: 4f 8d ac 25 ff 0f 00 lea 0xfff(%r13,%r12,1),%r13
b: 00
c: 49 81 e5 00 f0 ff ff and $0xfffffffffffff000,%r13
13: 49 39 c5 cmp %rax,%r13
16: 72 7a jb 0x92
18: e8 27 7f b7 ff call 0xffb77f44
1d: 4c 39 eb cmp %r13,%rbx
20: 74 7d je 0x9f
22: 4c 89 64 24 08 mov %r12,0x8(%rsp)
* 27: 44 8a 23 mov (%rbx),%r12b <-- trapping instruction
2a: 43 0f b6 04 3e movzbl (%r14,%r15,1),%eax
2f: 84 c0 test %al,%al
31: 75 18 jne 0x4b
33: 44 88 64 24 40 mov %r12b,0x40(%rsp)
38: 48 rex.W
39: 81 .byte 0x81
3a: c3 ret
3b: 00 10 add %dl,(%rax)