======================================================
WARNING: possible circular locking dependency detected
5.4.0-rc1+ #0 Not tainted
------------------------------------------------------
syz-executor940/8700 is trying to acquire lock:
ffff888091b2ce40 (&rp->fetch_lock){+.+.}, at: mon_bin_vma_fault+0x73/0x2d0 drivers/usb/mon/mon_bin.c:1237
but task is already holding lock:
ffff88808b3f2c58 (&mm->mmap_sem#2){++++}, at: __mm_populate+0x270/0x380 mm/gup.c:1251
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&mm->mmap_sem#2){++++}:
__might_fault mm/memory.c:4450 [inline]
__might_fault+0x15e/0x1e0 mm/memory.c:4435
_copy_to_user+0x30/0x160 lib/usercopy.c:26
copy_to_user include/linux/uaccess.h:152 [inline]
mon_bin_read+0x329/0x640 drivers/usb/mon/mon_bin.c:825
__vfs_read+0x8a/0x110 fs/read_write.c:425
vfs_read+0x1f0/0x440 fs/read_write.c:461
ksys_read+0x14f/0x290 fs/read_write.c:587
__do_sys_read fs/read_write.c:597 [inline]
__se_sys_read fs/read_write.c:595 [inline]
__x64_sys_read+0x73/0xb0 fs/read_write.c:595
do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 (&rp->fetch_lock){+.+.}:
check_prev_add kernel/locking/lockdep.c:2476 [inline]
check_prevs_add kernel/locking/lockdep.c:2581 [inline]
validate_chain kernel/locking/lockdep.c:2971 [inline]
__lock_acquire+0x2596/0x4a00 kernel/locking/lockdep.c:3955
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487
__mutex_lock_common kernel/locking/mutex.c:956 [inline]
__mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1103
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
mon_bin_vma_fault+0x73/0x2d0 drivers/usb/mon/mon_bin.c:1237
__do_fault+0x111/0x540 mm/memory.c:3092
do_cow_fault mm/memory.c:3518 [inline]
do_fault mm/memory.c:3620 [inline]
handle_pte_fault mm/memory.c:3849 [inline]
__handle_mm_fault+0xce8/0x4040 mm/memory.c:3973
handle_mm_fault+0x3b7/0xaa0 mm/memory.c:4010
faultin_page mm/gup.c:640 [inline]
__get_user_pages+0x7d4/0x1b30 mm/gup.c:845
populate_vma_page_range+0x20d/0x2a0 mm/gup.c:1223
__mm_populate+0x204/0x380 mm/gup.c:1271
mm_populate include/linux/mm.h:2362 [inline]
vm_mmap_pgoff+0x213/0x230 mm/util.c:501
ksys_mmap_pgoff+0x4aa/0x630 mm/mmap.c:1629
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
__x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91
do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&mm->mmap_sem#2);
lock(&rp->fetch_lock);
lock(&mm->mmap_sem#2);
lock(&rp->fetch_lock);
*** DEADLOCK ***
1 lock held by syz-executor940/8700:
#0: ffff88808b3f2c58 (&mm->mmap_sem#2){++++}, at: __mm_populate+0x270/0x380 mm/gup.c:1251
stack backtrace:
CPU: 0 PID: 8700 Comm: syz-executor940 Not tainted 5.4.0-rc1+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_circular_bug.isra.0.cold+0x163/0x172 kernel/locking/lockdep.c:1685
check_noncircular+0x32e/0x3e0 kernel/locking/lockdep.c:1809
check_prev_add kernel/locking/lockdep.c:2476 [inline]
check_prevs_add kernel/locking/lockdep.c:2581 [inline]
validate_chain kernel/locking/lockdep.c:2971 [inline]
__lock_acquire+0x2596/0x4a00 kernel/locking/lockdep.c:3955
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4487
__mutex_lock_common kernel/locking/mutex.c:956 [inline]
__mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1103
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
mon_bin_vma_fault+0x73/0x2d0 drivers/usb/mon/mon_bin.c:1237
__do_fault+0x111/0x540 mm/memory.c:3092
do_cow_fault mm/memory.c:3518 [inline]
do_fault mm/memory.c:3620 [inline]
handle_pte_fault mm/memory.c:3849 [inline]
__handle_mm_fault+0xce8/0x4040 mm/memory.c:3973
handle_mm_fault+0x3b7/0xaa0 mm/memory.c:4010
faultin_page mm/gup.c:640 [inline]
__get_user_pages+0x7d4/0x1b30 mm/gup.c:845
populate_vma_page_range+0x20d/0x2a0 mm/gup.c:1223
__mm_populate+0x204/0x380 mm/gup.c:1271
mm_populate include/linux/mm.h:2362 [inline]
vm_mmap_pgoff+0x213/0x230 mm/util.c:501
ksys_mmap_pgoff+0x4aa/0x630 mm/mmap.c:1629
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
__x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91
do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x44a729
Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 7b cb fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff71ae06cd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 000000000044a729
RDX: 000000000300001f RSI: 0000000000003000 RDI: 0000000020ffa000
RBP: 00000000006dbc20 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000002012 R11: 0000000000000246 R12: 00000000006dbc2c
R13: 00007fffbb3ba1ff R14: 00007ff71ae079c0 R15: 00000000006dbc20