mmap: syz.0.17 (4433) uses deprecated remap_file_pages() syscall. See Documentation/mm/remap_file_pages.rst.
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.17/4433 is trying to acquire lock:
ffff88807cfc9f58 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
ffff88807cfc9f58 (&mm->mmap_lock){++++}-{3:3}, at: upgrade_mmap_lock_carefully+0xbb/0x140 mm/memory.c:5357
but task is already holding lock:
ffff888073e5c1b0 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
ffff888073e5c1b0 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: generic_file_write_iter+0x7f/0x2e0 mm/filemap.c:4003
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}:
down_write+0x36/0x60 kernel/locking/rwsem.c:1573
inode_lock include/linux/fs.h:758 [inline]
process_measurement+0x33c/0x1a10 security/integrity/ima/ima_main.c:242
ima_file_mmap+0x104/0x150 security/integrity/ima/ima_main.c:429
__do_sys_remap_file_pages mm/mmap.c:3036 [inline]
__se_sys_remap_file_pages+0x53e/0x770 mm/mmap.c:2968
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 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 kernel/locking/lockdep.c:3825 [inline]
__lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049
lock_acquire+0x1b4/0x490 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:5357
lock_mm_and_find_vma+0x117/0x2f0 mm/memory.c:5410
do_user_addr_fault+0x2db/0xb10 arch/x86/mm/fault.c:1312
handle_page_fault arch/x86/mm/fault.c:1431 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1487
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+0xbb/0x2e0 lib/iov_iter.c:356
generic_perform_write+0x1d2/0x560 mm/filemap.c:3836
__generic_file_write_iter+0x172/0x430 mm/filemap.c:3974
generic_file_write_iter+0xab/0x2e0 mm/filemap.c:4006
call_write_iter include/linux/fs.h:2265 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x44c/0x960 fs/read_write.c:584
ksys_write+0x143/0x240 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 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 ***
2 locks held by syz.0.17/4433:
#0: ffff88807bf60460 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x256/0x960 fs/read_write.c:580
#1: ffff888073e5c1b0 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#1: ffff888073e5c1b0 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: generic_file_write_iter+0x7f/0x2e0 mm/filemap.c:4003
stack backtrace:
CPU: 0 PID: 4433 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
<TASK>
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
check_noncircular+0x274/0x310 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 kernel/locking/lockdep.c:3825 [inline]
__lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049
lock_acquire+0x1b4/0x490 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:5357
lock_mm_and_find_vma+0x117/0x2f0 mm/memory.c:5410
do_user_addr_fault+0x2db/0xb10 arch/x86/mm/fault.c:1312
handle_page_fault arch/x86/mm/fault.c:1431 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1487
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: 48 e7 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 27 e7 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 0a e7
RSP: 0018:ffffc900035a7a90 EFLAGS: 00050287
RAX: ffffffff81bbef39 RBX: 0000000000001000 RCX: ffff88807efd1dc0
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88807efd1dc0 R09: 0000000000000002
R10: 0000000000000006 R11: 0000000000000000 R12: 0000200000002000
R13: dffffc0000000000 R14: 0000200000000100 R15: 0000200000001000
fault_in_iov_iter_readable+0xbb/0x2e0 lib/iov_iter.c:356
generic_perform_write+0x1d2/0x560 mm/filemap.c:3836
__generic_file_write_iter+0x172/0x430 mm/filemap.c:3974
generic_file_write_iter+0xab/0x2e0 mm/filemap.c:4006
call_write_iter include/linux/fs.h:2265 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x44c/0x960 fs/read_write.c:584
ksys_write+0x143/0x240 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fec11f8f749
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:00007fffd97579f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fec121e5fa0 RCX: 00007fec11f8f749
RDX: 0000000000032600 RSI: 0000200000000100 RDI: 0000000000000003
RBP: 00007fec12013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fec121e5fa0 R14: 00007fec121e5fa0 R15: 0000000000000003
</TASK>
----------------
Code disassembly (best guess):
0: 48 e7 c4 rex.W out %eax,$0xc4
3: ff 4d 89 decl -0x77(%rbp)
6: f4 hlt
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 27 e7 c4 ff call 0xffc4e74c
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: 0a e7 or %bh,%ah