====================================================== WARNING: possible circular locking dependency detected 4.19.83 #0 Not tainted ------------------------------------------------------ syz-executor.2/28280 is trying to acquire lock: 0000000054f1f3c0 (&mm->mmap_sem){++++}, at: __might_fault+0xfb/0x1e0 mm/memory.c:4637 but task is already holding lock: 000000006222b176 (&rp->fetch_lock){+.+.}, at: mon_bin_read+0x60/0x640 drivers/usb/mon/mon_bin.c:813 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&rp->fetch_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1300 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+0x111/0x480 mm/memory.c:3269 do_cow_fault mm/memory.c:3710 [inline] do_fault mm/memory.c:3812 [inline] handle_pte_fault mm/memory.c:4041 [inline] __handle_mm_fault+0xf6d/0x3f80 mm/memory.c:4165 handle_mm_fault+0x1b5/0x690 mm/memory.c:4202 faultin_page mm/gup.c:530 [inline] __get_user_pages+0x609/0x17a0 mm/gup.c:730 populate_vma_page_range+0x20d/0x2a0 mm/gup.c:1234 __mm_populate+0x204/0x380 mm/gup.c:1282 mm_populate include/linux/mm.h:2328 [inline] vm_mmap_pgoff+0x213/0x230 mm/util.c:362 ksys_mmap_pgoff+0x4aa/0x630 mm/mmap.c:1586 __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+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&mm->mmap_sem){++++}: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903 __might_fault mm/memory.c:4638 [inline] __might_fault+0x15e/0x1e0 mm/memory.c:4623 _copy_to_user+0x30/0x120 lib/usercopy.c:25 copy_to_user include/linux/uaccess.h:155 [inline] mon_bin_read+0x329/0x640 drivers/usb/mon/mon_bin.c:825 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x490/0x640 fs/read_write.c:925 vfs_readv+0xf0/0x160 fs/read_write.c:987 do_readv+0x15e/0x370 fs/read_write.c:1020 __do_sys_readv fs/read_write.c:1107 [inline] __se_sys_readv fs/read_write.c:1104 [inline] __x64_sys_readv+0x75/0xb0 fs/read_write.c:1104 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rp->fetch_lock); lock(&mm->mmap_sem); lock(&rp->fetch_lock); lock(&mm->mmap_sem); *** DEADLOCK *** 1 lock held by syz-executor.2/28280: #0: 000000006222b176 (&rp->fetch_lock){+.+.}, at: mon_bin_read+0x60/0x640 drivers/usb/mon/mon_bin.c:813 stack backtrace: CPU: 0 PID: 28280 Comm: syz-executor.2 Not tainted 4.19.83 #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+0x1cc/0x28f kernel/locking/lockdep.c:1221 check_prev_add kernel/locking/lockdep.c:1861 [inline] check_prevs_add kernel/locking/lockdep.c:1974 [inline] validate_chain kernel/locking/lockdep.c:2415 [inline] __lock_acquire+0x2e19/0x49c0 kernel/locking/lockdep.c:3411 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903 __might_fault mm/memory.c:4638 [inline] __might_fault+0x15e/0x1e0 mm/memory.c:4623 _copy_to_user+0x30/0x120 lib/usercopy.c:25 copy_to_user include/linux/uaccess.h:155 [inline] mon_bin_read+0x329/0x640 drivers/usb/mon/mon_bin.c:825 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x490/0x640 fs/read_write.c:925 vfs_readv+0xf0/0x160 fs/read_write.c:987 do_readv+0x15e/0x370 fs/read_write.c:1020 __do_sys_readv fs/read_write.c:1107 [inline] __se_sys_readv fs/read_write.c:1104 [inline] __x64_sys_readv+0x75/0xb0 fs/read_write.c:1104 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a219 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fce3a302c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a219 RDX: 0000000000000007 RSI: 0000000020000600 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fce3a3036d4 R13: 00000000004c7aa2 R14: 00000000004ddd20 R15: 00000000ffffffff kobject: 'loop5' (00000000be212a0c): kobject_uevent_env kobject: 'loop5' (00000000be212a0c): fill_kobj_path: path = '/devices/virtual/block/loop5' ptrace attach of ""[28394] was attempted by "/root/syz-executor.1"[28400] kobject: 'loop0' (000000004a36cc11): kobject_uevent_env kobject: 'loop0' (000000004a36cc11): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000f3175a5f): kobject_uevent_env kobject: 'loop4' (00000000f3175a5f): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop2' (00000000ca4e988f): kobject_uevent_env kobject: 'loop2' (00000000ca4e988f): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (000000008f11640d): kobject_uevent_env kobject: 'loop3' (000000008f11640d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (000000004a36cc11): kobject_uevent_env kobject: 'loop0' (000000004a36cc11): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000f3175a5f): kobject_uevent_env kobject: 'loop4' (00000000f3175a5f): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (000000008f11640d): kobject_uevent_env kobject: 'loop3' (000000008f11640d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (000000004a36cc11): kobject_uevent_env kobject: 'loop0' (000000004a36cc11): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (00000000ca4e988f): kobject_uevent_env kobject: 'loop2' (00000000ca4e988f): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000f3175a5f): kobject_uevent_env kobject: 'loop4' (00000000f3175a5f): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (000000008f11640d): kobject_uevent_env kobject: 'loop3' (000000008f11640d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (00000000be212a0c): kobject_uevent_env kobject: 'loop5' (00000000be212a0c): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (000000004a36cc11): kobject_uevent_env kobject: 'loop0' (000000004a36cc11): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (00000000ca4e988f): kobject_uevent_env kobject: 'loop2' (00000000ca4e988f): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000f3175a5f): kobject_uevent_env kobject: 'loop4' (00000000f3175a5f): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (000000008f11640d): kobject_uevent_env kobject: 'loop3' (000000008f11640d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (000000004a36cc11): kobject_uevent_env kobject: 'loop0' (000000004a36cc11): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000f3175a5f): kobject_uevent_env kobject: 'loop4' (00000000f3175a5f): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (000000008f11640d): kobject_uevent_env kobject: 'loop3' (000000008f11640d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000ca4e988f): kobject_uevent_env kobject: 'loop2' (00000000ca4e988f): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (00000000be212a0c): kobject_uevent_env kobject: 'loop5' (00000000be212a0c): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (000000004a36cc11): kobject_uevent_env kobject: 'loop0' (000000004a36cc11): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000f3175a5f): kobject_uevent_env kobject: 'loop4' (00000000f3175a5f): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (000000004a36cc11): kobject_uevent_env kobject: 'loop0' (000000004a36cc11): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (000000008f11640d): kobject_uevent_env kobject: 'loop3' (000000008f11640d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (000000004a36cc11): kobject_uevent_env kobject: 'loop0' (000000004a36cc11): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000f3175a5f): kobject_uevent_env kobject: 'loop4' (00000000f3175a5f): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (000000008f11640d): kobject_uevent_env kobject: 'loop3' (000000008f11640d): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (00000000ca4e988f): kobject_uevent_env kobject: 'loop2' (00000000ca4e988f): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (00000000be212a0c): kobject_uevent_env kobject: 'loop5' (00000000be212a0c): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (000000004a36cc11): kobject_uevent_env kobject: 'loop0' (000000004a36cc11): fill_kobj_path: path = '/devices/virtual/block/loop0'