======================================================
WARNING: possible circular locking dependency detected
6.1.120-syzkaller-00773-g52f863f820fd #0 Tainted: G W
------------------------------------------------------
syz.4.929/7876 is trying to acquire lock:
ffff88802995c4d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
ffff88802995c4d8 (&mm->mmap_lock){++++}-{3:3}, at: upgrade_mmap_lock_carefully+0xbb/0x140 mm/memory.c:5355
but task is already holding lock:
ffff888054b3bb60 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
ffff888054b3bb60 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: generic_file_write_iter+0x7f/0x310 mm/filemap.c:4002
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}:
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
down_write+0x36/0x60 kernel/locking/rwsem.c:1573
inode_lock include/linux/fs.h:758 [inline]
process_measurement+0x446/0x21b0 security/integrity/ima/ima_main.c:242
ima_file_mmap+0x121/0x1c0 security/integrity/ima/ima_main.c:429
__do_sys_remap_file_pages mm/mmap.c:3024 [inline]
__se_sys_remap_file_pages+0x67a/0x8b0 mm/mmap.c:2956
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 (&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+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_write_killable+0x45/0x90 kernel/locking/rwsem.c:1584
mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
upgrade_mmap_lock_carefully+0xbb/0x140 mm/memory.c:5355
lock_mm_and_find_vma+0x115/0x2e0 mm/memory.c:5408
do_user_addr_fault arch/x86/mm/fault.c:1312 [inline]
handle_page_fault arch/x86/mm/fault.c:1431 [inline]
exc_page_fault+0x169/0x620 arch/x86/mm/fault.c:1487
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
fault_in_readable+0x1c8/0x340
fault_in_iov_iter_readable+0xdb/0x270 lib/iov_iter.c:356
generic_perform_write+0x207/0x5e0 mm/filemap.c:3835
__generic_file_write_iter+0x176/0x400 mm/filemap.c:3973
generic_file_write_iter+0xab/0x310 mm/filemap.c:4005
call_write_iter include/linux/fs.h:2265 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x857/0xbc0 fs/read_write.c:584
ksys_write+0x19c/0x2c0 fs/read_write.c:637
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:
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.4.929/7876:
#0: ffff88807dbf2fe8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2ba/0x360 fs/file.c:1031
#1: ffff888068f78460 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x269/0xbc0 fs/read_write.c:580
#2: ffff888054b3bb60 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#2: ffff888054b3bb60 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: generic_file_write_iter+0x7f/0x310 mm/filemap.c:4002
stack backtrace:
CPU: 0 PID: 7876 Comm: syz.4.929 Tainted: G W 6.1.120-syzkaller-00773-g52f863f820fd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
Call Trace:
<TASK>
__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_write_killable+0x45/0x90 kernel/locking/rwsem.c:1584
mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
upgrade_mmap_lock_carefully+0xbb/0x140 mm/memory.c:5355
lock_mm_and_find_vma+0x115/0x2e0 mm/memory.c:5408
do_user_addr_fault arch/x86/mm/fault.c:1312 [inline]
handle_page_fault arch/x86/mm/fault.c:1431 [inline]
exc_page_fault+0x169/0x620 arch/x86/mm/fault.c:1487
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0010:fault_in_readable+0x1c8/0x340 mm/gup.c:1898
Code: 24 08 4c 8d b0 ff 0f 00 00 48 89 c3 4d 01 e6 49 81 e6 00 f0 ff ff 49 39 c6 72 70 e8 d2 b1 bf ff 4c 39 f3 74 73 4c 89 64 24 10 <44> 8a 23 43 0f b6 04 2f 84 c0 75 18 44 88 64 24 40 48 81 c3 00 10
RSP: 0018:ffffc900048e79e0 EFLAGS: 00050287
RAX: ffffffff81caea9e RBX: 0000000020001000 RCX: 0000000000080000
RDX: ffffc9000ccfa000 RSI: 0000000000000077 RDI: 0000000000000078
RBP: ffffc900048e7a98 R08: ffffffff81caea36 R09: ffffffff844210c5
R10: 0000000000000002 R11: ffff88802a838000 R12: 0000000000001000
R13: dffffc0000000000 R14: 0000000020002000 R15: 1ffff9200091cf44
fault_in_iov_iter_readable+0xdb/0x270 lib/iov_iter.c:356
generic_perform_write+0x207/0x5e0 mm/filemap.c:3835
__generic_file_write_iter+0x176/0x400 mm/filemap.c:3973
generic_file_write_iter+0xab/0x310 mm/filemap.c:4005
call_write_iter include/linux/fs.h:2265 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x857/0xbc0 fs/read_write.c:584
ksys_write+0x19c/0x2c0 fs/read_write.c:637
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: 0033:0x7f5fecf85d19
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:00007f5fedd64038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f5fed175fa0 RCX: 00007f5fecf85d19
RDX: 000000000000fecc RSI: 0000000020000100 RDI: 0000000000000003
RBP: 00007f5fed001a20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5fed175fa0 R15: 00007ffe5926be08
</TASK>
----------------
Code disassembly (best guess):
0: 24 08 and $0x8,%al
2: 4c 8d b0 ff 0f 00 00 lea 0xfff(%rax),%r14
9: 48 89 c3 mov %rax,%rbx
c: 4d 01 e6 add %r12,%r14
f: 49 81 e6 00 f0 ff ff and $0xfffffffffffff000,%r14
16: 49 39 c6 cmp %rax,%r14
19: 72 70 jb 0x8b
1b: e8 d2 b1 bf ff call 0xffbfb1f2
20: 4c 39 f3 cmp %r14,%rbx
23: 74 73 je 0x98
25: 4c 89 64 24 10 mov %r12,0x10(%rsp)
* 2a: 44 8a 23 mov (%rbx),%r12b <-- trapping instruction
2d: 43 0f b6 04 2f movzbl (%r15,%r13,1),%eax
32: 84 c0 test %al,%al
34: 75 18 jne 0x4e
36: 44 88 64 24 40 mov %r12b,0x40(%rsp)
3b: 48 rex.W
3c: 81 .byte 0x81
3d: c3 ret
3e: 00 10 add %dl,(%rax)