============================= WARNING: suspicious RCU usage 5.13.0-rc1-syzkaller #0 Not tainted ----------------------------- kernel/sched/core.c:8304 Illegal context switch in RCU-sched read-side critical section! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 0 1 lock held by syz-executor.5/10165: #0: ffff888017862458 ( &mm->mmap_lock #2 ){++++}-{3:3} , at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] , at: do_user_addr_fault+0x285/0x1210 arch/x86/mm/fault.c:1331 stack backtrace: CPU: 0 PID: 10165 Comm: syz-executor.5 Not tainted 5.13.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 ___might_sleep+0x266/0x2c0 kernel/sched/core.c:8304 process_huge_page mm/memory.c:5100 [inline] clear_huge_page+0x9c/0x560 mm/memory.c:5161 __do_huge_pmd_anonymous_page mm/huge_memory.c:608 [inline] do_huge_pmd_anonymous_page+0x60e/0x2570 mm/huge_memory.c:771 create_huge_pmd mm/memory.c:4238 [inline] __handle_mm_fault+0x2ffd/0x52c0 mm/memory.c:4473 handle_mm_fault+0x1bc/0x7e0 mm/memory.c:4600 do_user_addr_fault+0x483/0x1210 arch/x86/mm/fault.c:1390 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577 RIP: 0010:__put_user_nocheck_4+0x3/0x11 Code: 00 00 48 39 d9 73 54 0f 01 cb 66 89 01 31 c9 0f 01 ca c3 0f 1f 44 00 00 48 bb fd ef ff ff ff 7f 00 00 48 39 d9 73 34 0f 01 cb <89> 01 31 c9 0f 01 ca c3 66 0f 1f 44 00 00 48 bb f9 ef ff ff ff 7f RSP: 0018:ffffc90017b0fe40 EFLAGS: 00050293 RAX: 0000000000000003 RBX: 00007fffffffeffd RCX: 0000000020002240 RDX: 0000000000040000 RSI: ffffffff8702a30b RDI: 0000000000000000 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000004 R14: 0000000000000000 R15: dffffc0000000000 __sys_socketpair+0x107/0x570 net/socket.c:1546 __do_sys_socketpair net/socket.c:1612 [inline] __se_sys_socketpair net/socket.c:1609 [inline] __x64_sys_socketpair+0x93/0xf0 net/socket.c:1609 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f139622f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020002240 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffda740fb1f R14: 00007f139622f300 R15: 0000000000022000