===================================== WARNING: bad unlock balance detected! 5.6.0-syzkaller #0 Not tainted ------------------------------------- syz-executor.3/8510 is trying to release lock (&mm->mmap_sem) at: [] __get_user_pages_locked mm/gup.c:1366 [inline] [] __get_user_pages_remote+0x33f/0x430 mm/gup.c:1831 but there are no more locks to release! other info that might help us debug this: no locks held by syz-executor.3/8510. stack backtrace: CPU: 0 PID: 8510 Comm: syz-executor.3 Not tainted 5.6.0-syzkaller #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+0x128/0x182 lib/dump_stack.c:118 __lock_release kernel/locking/lockdep.c:4633 [inline] lock_release+0x5aa/0x7f0 kernel/locking/lockdep.c:4941 up_read+0x79/0x740 kernel/locking/rwsem.c:1573 __get_user_pages_locked mm/gup.c:1366 [inline] __get_user_pages_remote+0x33f/0x430 mm/gup.c:1831 process_vm_rw_single_vec mm/process_vm_access.c:108 [inline] process_vm_rw_core.isra.1+0x3a9/0x7a0 mm/process_vm_access.c:218 process_vm_rw+0x1be/0x1f0 mm/process_vm_access.c:286 __do_sys_process_vm_writev mm/process_vm_access.c:308 [inline] __se_sys_process_vm_writev mm/process_vm_access.c:303 [inline] __x64_sys_process_vm_writev+0xda/0x1b0 mm/process_vm_access.c:303 do_syscall_64+0xc6/0x620 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c879 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:00007fecdeeecc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000137 RAX: ffffffffffffffda RBX: 00007fecdeeed6d4 RCX: 000000000045c879 RDX: 0000000000000001 RSI: 0000000020c22000 RDI: 0000000000000004 RBP: 000000000076bf00 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000020c22fa0 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000085d R14: 00000000004cb1ee R15: 000000000076bf0c