======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc5-next-20241104 #1 Not tainted
------------------------------------------------------
syz-executor.2/17915 is trying to acquire lock:
ffff88801890bae0 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault+0xe0/0x190
but task is already holding lock:
ffff88800ea988e8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x99/0x270
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&q->debugfs_mutex){+.+.}-{4:4}:
__mutex_lock+0x13d/0xac0
blk_mq_init_sched+0x429/0x670
elevator_init_mq+0x299/0x3d0
add_disk_fwnode+0x113/0x1310
sd_probe+0xa82/0xf20
really_probe+0x240/0x820
__driver_probe_device+0x2c4/0x380
driver_probe_device+0x4e/0x2a0
__device_attach_driver+0x1d4/0x390
bus_for_each_drv+0x14c/0x1d0
__device_attach_async_helper+0x1d1/0x260
async_run_entry_fn+0x91/0x290
process_one_work+0x8ee/0x1a00
worker_thread+0x674/0xe70
kthread+0x2c2/0x3a0
ret_from_fork+0x48/0x80
ret_from_fork_asm+0x1a/0x30
-> #3 (&q->q_usage_counter(io)){++++}-{0:0}:
blk_mq_submit_bio+0x1faa/0x26a0
__submit_bio+0x175/0x480
submit_bio_noacct_nocheck+0x641/0xcc0
submit_bio_noacct+0x3b3/0x13b0
ext4_mpage_readpages+0x5c0/0x1060
ext4_readahead+0x106/0x140
read_pages+0x1a6/0xc70
page_cache_ra_unbounded+0x353/0x670
page_cache_ra_order+0x1d4/0x290
page_cache_sync_ra+0x51a/0xa60
filemap_get_pages+0x329/0x1880
filemap_read+0x386/0xbc0
generic_file_read_iter+0x2ec/0x3f0
ext4_file_read_iter+0x188/0x4a0
__kernel_read+0x3cd/0xb20
kernel_read+0xc3/0x230
bprm_execve+0x618/0x1850
kernel_execve+0x2ff/0x3d0
kernel_init+0x159/0x2d0
ret_from_fork+0x48/0x80
ret_from_fork_asm+0x1a/0x30
-> #2 (mapping.invalidate_lock){++++}-{4:4}:
down_read+0x9a/0x320
filemap_fault+0xc66/0x2cb0
__do_fault+0x10d/0x480
__handle_mm_fault+0x122b/0x2f50
handle_mm_fault+0x2b4/0x6a0
do_user_addr_fault+0x4fa/0xf40
exc_page_fault+0x9c/0x1a0
asm_exc_page_fault+0x26/0x30
-> #1 (&vma->vm_lock->lock){++++}-{4:4}:
down_write+0x92/0x1f0
vma_link+0x240/0x690
insert_vm_struct+0x197/0x3f0
alloc_bprm+0x5f7/0xbe0
kernel_execve+0xb0/0x3d0
kernel_init+0x159/0x2d0
ret_from_fork+0x48/0x80
ret_from_fork_asm+0x1a/0x30
-> #0 (&mm->mmap_lock){++++}-{4:4}:
__lock_acquire+0x2930/0x4430
lock_acquire.part.0+0xeb/0x320
__might_fault+0x110/0x190
_copy_from_user+0x2b/0xd0
__blk_trace_setup+0x96/0x180
blk_trace_ioctl+0x137/0x270
blkdev_ioctl+0x108/0x6d0
__x64_sys_ioctl+0x1a0/0x210
do_syscall_64+0xbf/0x1d0
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&mm->mmap_lock --> &q->q_usage_counter(io) --> &q->debugfs_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&q->debugfs_mutex);
lock(&q->q_usage_counter(io));
lock(&q->debugfs_mutex);
rlock(&mm->mmap_lock);
*** DEADLOCK ***
1 lock held by syz-executor.2/17915:
#0: ffff88800ea988e8 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x99/0x270
stack backtrace:
CPU: 1 UID: 0 PID: 17915 Comm: syz-executor.2 Not tainted 6.12.0-rc5-next-20241104 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0xca/0x120
print_circular_bug+0x53f/0x820
check_noncircular+0x2e9/0x3c0
__lock_acquire+0x2930/0x4430
lock_acquire.part.0+0xeb/0x320
__might_fault+0x110/0x190
_copy_from_user+0x2b/0xd0
__blk_trace_setup+0x96/0x180
blk_trace_ioctl+0x137/0x270
blkdev_ioctl+0x108/0x6d0
__x64_sys_ioctl+0x1a0/0x210
do_syscall_64+0xbf/0x1d0
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f52e895bb19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f52e5eb0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f52e8a6f020 RCX: 00007f52e895bb19
RDX: 0000000020000300 RSI: 00000000c0481273 RDI: 0000000000000005
RBP: 00007f52e89b5f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff804d254f R14: 00007f52e5eb0300 R15: 0000000000022000
</TASK>
blktrace: Concurrent blktraces are not allowed on loop0
random: crng reseeded on system resumption
random: crng reseeded on system resumption
random: crng reseeded on system resumption
random: crng reseeded on system resumption
random: crng reseeded on system resumption