======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc5-syzkaller #0 Not tainted
------------------------------------------------------
syz.1.1523/15716 is trying to acquire lock:
ffff88801233b118 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153
but task is already holding lock:
ffff88807f3029f8 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
ffff88807f3029f8 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: shmem_file_write_iter+0x80/0x120 mm/shmem.c:3206
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+0x1ed/0x550 kernel/locking/lockdep.c:5825
down_write+0x99/0x220 kernel/locking/rwsem.c:1577
inode_lock include/linux/fs.h:815 [inline]
process_measurement+0x439/0x1fb0 security/integrity/ima/ima_main.c:250
ima_file_mmap+0x13d/0x2b0 security/integrity/ima/ima_main.c:455
security_mmap_file+0x7e7/0xa40 security/security.c:2979
__do_sys_remap_file_pages mm/mmap.c:1702 [inline]
__se_sys_remap_file_pages+0x6e6/0xa50 mm/mmap.c:1634
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> #0 (&mm->mmap_lock){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153
get_mmap_lock_carefully mm/memory.c:6112 [inline]
lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6163
do_user_addr_fault arch/x86/mm/fault.c:1361 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x1bf/0x8c0 arch/x86/mm/fault.c:1539
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
generic_perform_write+0x259/0x6d0 mm/filemap.c:4044
shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3216
new_sync_write fs/read_write.c:590 [inline]
vfs_write+0xaeb/0xd30 fs/read_write.c:683
ksys_write+0x183/0x2b0 fs/read_write.c:736
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
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);
rlock(&mm->mmap_lock);
*** DEADLOCK ***
3 locks held by syz.1.1523/15716:
#0: ffff88806b134638 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1160
#1: ffff888024536420 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline]
#1: ffff888024536420 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x225/0xd30 fs/read_write.c:679
#2: ffff88807f3029f8 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
#2: ffff88807f3029f8 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: shmem_file_write_iter+0x80/0x120 mm/shmem.c:3206
stack backtrace:
CPU: 1 UID: 0 PID: 15716 Comm: syz.1.1523 Not tainted 6.12.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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:2074
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
down_read_killable+0xca/0xd30 kernel/locking/rwsem.c:1547
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:153
get_mmap_lock_carefully mm/memory.c:6112 [inline]
lock_mm_and_find_vma+0x29c/0x2f0 mm/memory.c:6163
do_user_addr_fault arch/x86/mm/fault.c:1361 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x1bf/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:fault_in_readable+0x173/0x2d0 mm/gup.c:2235
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 b7 bf b3 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: 0018:ffffc9000b41fa20 EFLAGS: 00050283
RAX: ffffffff81e11905 RBX: 00000000201b8000 RCX: 0000000000040000
RDX: ffffc90004892000 RSI: 000000000000c03a RDI: 000000000000c03b
RBP: ffffc9000b41fad8 R08: ffffffff81e1186c R09: ffffffff84ba85c9
R10: 0000000000000002 R11: ffff88801e7c9e00 R12: 0000000000200000
R13: 0000000020201000 R14: 1ffff92001683f4c R15: dffffc0000000000
fault_in_iov_iter_readable+0x229/0x280 lib/iov_iter.c:94
generic_perform_write+0x259/0x6d0 mm/filemap.c:4044
shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3216
new_sync_write fs/read_write.c:590 [inline]
vfs_write+0xaeb/0xd30 fs/read_write.c:683
ksys_write+0x183/0x2b0 fs/read_write.c:736
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf73ad579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f569655c EFLAGS: 00000206 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000240
RDX: 000000000208e24b RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</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 b7 bf b3 ff call 0xffb3bfd4
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)