audit: type=1400 audit(1571628402.223:36): avc: denied { map } for pid=6932 comm="syz-executor509" path="/root/syz-executor509828604" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
audit: type=1400 audit(1571628402.283:37): avc: denied { map } for pid=6941 comm="syz-executor509" path="/dev/usbmon0" dev="devtmpfs" ino=255 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:usbmon_device_t:s0 tclass=chr_file permissive=1
======================================================
WARNING: possible circular locking dependency detected
4.14.150 #0 Not tainted
------------------------------------------------------
syz-executor509/6944 is trying to acquire lock:
(&rp->fetch_lock){+.+.}, at: [<ffffffff83f76c6f>] mon_bin_vma_fault+0x6f/0x280 drivers/usb/mon/mon_bin.c:1236
but task is already holding lock:
(&mm->mmap_sem){++++}, at: [<ffffffff817bec75>] __mm_populate+0x1e5/0x2c0 mm/gup.c:1259
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&mm->mmap_sem){++++}:
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__might_fault mm/memory.c:4584 [inline]
__might_fault+0x143/0x1d0 mm/memory.c:4569
_copy_to_user+0x2c/0xd0 lib/usercopy.c:25
copy_to_user include/linux/uaccess.h:155 [inline]
mon_bin_read+0x2fb/0x5e0 drivers/usb/mon/mon_bin.c:825
__vfs_read+0x105/0x6a0 fs/read_write.c:411
vfs_read+0x137/0x350 fs/read_write.c:447
SYSC_read fs/read_write.c:574 [inline]
SyS_read+0xfd/0x230 fs/read_write.c:567
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
-> #0 (&rp->fetch_lock){+.+.}:
check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]
__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
mon_bin_vma_fault+0x6f/0x280 drivers/usb/mon/mon_bin.c:1236
__do_fault+0x104/0x390 mm/memory.c:3223
do_cow_fault mm/memory.c:3662 [inline]
do_fault mm/memory.c:3761 [inline]
handle_pte_fault mm/memory.c:3989 [inline]
__handle_mm_fault+0xde1/0x3470 mm/memory.c:4113
handle_mm_fault+0x293/0x7c0 mm/memory.c:4150
faultin_page mm/gup.c:514 [inline]
__get_user_pages+0x465/0x1220 mm/gup.c:714
populate_vma_page_range+0x18e/0x230 mm/gup.c:1231
__mm_populate+0x198/0x2c0 mm/gup.c:1279
mm_populate include/linux/mm.h:2187 [inline]
vm_mmap_pgoff+0x1be/0x1d0 mm/util.c:338
SYSC_mmap_pgoff mm/mmap.c:1551 [inline]
SyS_mmap_pgoff+0x3ca/0x520 mm/mmap.c:1509
SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
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-executor509/6944:
#0: (&mm->mmap_sem){++++}, at: [<ffffffff817bec75>] __mm_populate+0x1e5/0x2c0 mm/gup.c:1259
stack backtrace:
CPU: 0 PID: 6944 Comm: syz-executor509 Not tainted 4.14.150 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x197 lib/dump_stack.c:53
print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]
__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
lock_acquire+0x16f/0x430 kernel/locking/lockdep.c:3994
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xe8/0x1470 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
mon_bin_vma_fault+0x6f/0x280 drivers/usb/mon/mon_bin.c:1236
__do_fault+0x104/0x390 mm/memory.c:3223
do_cow_fault mm/memory.c:3662 [inline]
do_fault mm/memory.c:3761 [inline]
handle_pte_fault mm/memory.c:3989 [inline]
__handle_mm_fault+0xde1/0x3470 mm/memory.c:4113
handle_mm_fault+0x293/0x7c0 mm/memory.c:4150
faultin_page mm/gup.c:514 [inline]
__get_user_pages+0x465/0x1220 mm/gup.c:714
populate_vma_page_range+0x18e/0x230 mm/gup.c:1231
__mm_populate+0x198/0x2c0 mm/gup.c:1279
mm_populate include/linux/mm.h:2187 [inline]
vm_mmap_pgoff+0x1be/0x1d0 mm/util.c:338
SYSC_mmap_pgoff mm/mmap.c:1551 [inline]
SyS_mmap_pgoff+0x3ca/0x520 mm/mmap.c:1509
SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x44a729
RSP: 002b:00007f2f379e5cd8 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: 00007ffe5e93ceaf R14: 00007f2f379e69c0 R15: 00000000006dbc20