======================================================
WARNING: possible circular locking dependency detected
5.0.0+ #15 Not tainted
------------------------------------------------------
syz-executor288/7692 is trying to acquire lock:
000000008151ef6e (&rp->fetch_lock){+.+.}, at: mon_bin_vma_fault+0x73/0x2d0 drivers/usb/mon/mon_bin.c:1237
but task is already holding lock:
00000000f36af9e8 (&mm->mmap_sem){++++}, at: __mm_populate+0x270/0x380 mm/gup.c:1427
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&mm->mmap_sem){++++}:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4202
__might_fault mm/memory.c:4406 [inline]
__might_fault+0x15e/0x1e0 mm/memory.c:4391
_copy_to_user+0x30/0x120 lib/usercopy.c:25
copy_to_user include/linux/uaccess.h:152 [inline]
mon_bin_read+0x329/0x640 drivers/usb/mon/mon_bin.c:825
do_loop_readv_writev fs/read_write.c:700 [inline]
do_loop_readv_writev fs/read_write.c:687 [inline]
do_iter_read+0x4a9/0x660 fs/read_write.c:921
vfs_readv+0xf0/0x160 fs/read_write.c:983
do_preadv+0x1c4/0x280 fs/read_write.c:1067
__do_sys_preadv fs/read_write.c:1117 [inline]
__se_sys_preadv fs/read_write.c:1112 [inline]
__x64_sys_preadv+0x9a/0xf0 fs/read_write.c:1112
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 (&rp->fetch_lock){+.+.}:
check_prevs_add kernel/locking/lockdep.c:2324 [inline]
validate_chain kernel/locking/lockdep.c:2705 [inline]
__lock_acquire+0x239c/0x3fb0 kernel/locking/lockdep.c:3692
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4202
__mutex_lock_common kernel/locking/mutex.c:925 [inline]
__mutex_lock+0xf7/0x1310 kernel/locking/mutex.c:1072
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
mon_bin_vma_fault+0x73/0x2d0 drivers/usb/mon/mon_bin.c:1237
__do_fault+0x116/0x4e0 mm/memory.c:3039
do_cow_fault mm/memory.c:3478 [inline]
do_fault mm/memory.c:3580 [inline]
handle_pte_fault mm/memory.c:3809 [inline]
__handle_mm_fault+0xf6c/0x3ec0 mm/memory.c:3933
handle_mm_fault+0x43f/0xb30 mm/memory.c:3970
faultin_page mm/gup.c:538 [inline]
__get_user_pages+0x7b6/0x1a40 mm/gup.c:741
populate_vma_page_range+0x20d/0x2a0 mm/gup.c:1399
__mm_populate+0x204/0x380 mm/gup.c:1447
mm_populate include/linux/mm.h:2343 [inline]
vm_mmap_pgoff+0x213/0x230 mm/util.c:367
ksys_mmap_pgoff+0x4aa/0x630 mm/mmap.c:1609
__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+0x103/0x610 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);
lock(&rp->fetch_lock);
lock(&mm->mmap_sem);
lock(&rp->fetch_lock);
*** DEADLOCK ***
1 lock held by syz-executor288/7692:
#0: 00000000f36af9e8 (&mm->mmap_sem){++++}, at: __mm_populate+0x270/0x380 mm/gup.c:1427
stack backtrace:
CPU: 0 PID: 7692 Comm: syz-executor288 Not tainted 5.0.0+ #15
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+0x1cc/0x28f kernel/locking/lockdep.c:1562
check_prev_add.constprop.0+0xf11/0x23c0 kernel/locking/lockdep.c:2211
check_prevs_add kernel/locking/lockdep.c:2324 [inline]
validate_chain kernel/locking/lockdep.c:2705 [inline]
__lock_acquire+0x239c/0x3fb0 kernel/locking/lockdep.c:3692
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4202
__mutex_lock_common kernel/locking/mutex.c:925 [inline]
__mutex_lock+0xf7/0x1310 kernel/locking/mutex.c:1072
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
mon_bin_vma_fault+0x73/0x2d0 drivers/usb/mon/mon_bin.c:1237
__do_fault+0x116/0x4e0 mm/memory.c:3039
do_cow_fault mm/memory.c:3478 [inline]
do_fault mm/memory.c:3580 [inline]
handle_pte_fault mm/memory.c:3809 [inline]
__handle_mm_fault+0xf6c/0x3ec0 mm/memory.c:3933
handle_mm_fault+0x43f/0xb30 mm/memory.c:3970
faultin_page mm/gup.c:538 [inline]
__get_user_pages+0x7b6/0x1a40 mm/gup.c:741
populate_vma_page_range+0x20d/0x2a0 mm/gup.c:1399
__mm_populate+0x204/0x380 mm/gup.c:1447
mm_populate include/linux/mm.h:2343 [inline]
vm_mmap_pgoff+0x213/0x230 mm/util.c:367
ksys_mmap_pgoff+0x4aa/0x630 mm/mmap.c:1609
__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+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x449669
Code: e8 9c b8 02 00 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 ab d6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f42af561cd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 0000000000449669
RDX: 0000000000000013 RSI: 0000000000400000 RDI: 0000000020a05000
RBP: 00000000006dac30 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000008012 R11: 0000000000000246 R12: 00000000006dac3c
R13: 00007fffff8fbadf R14: 00007f42af5629c0 R15: 20c49ba5e353f7cf