============================= WARNING: suspicious RCU usage 5.13.0-rc3-syzkaller #0 Not tainted ----------------------------- kernel/sched/core.c:8304 Illegal context switch in RCU-bh 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.1/10132: #0: ffff88802ec93958 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] #0: ffff88802ec93958 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x2d8/0x1120 arch/x86/mm/fault.c:1331 stack backtrace: CPU: 0 PID: 10132 Comm: syz-executor.1 Not tainted 5.13.0-rc3-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+0x202/0x31e lib/dump_stack.c:120 ___might_sleep+0xce/0x6b0 kernel/sched/core.c:8304 process_huge_page mm/memory.c:5100 [inline] clear_huge_page+0x208/0x8a0 mm/memory.c:5161 __do_huge_pmd_anonymous_page+0x2df/0xe80 mm/huge_memory.c:608 do_huge_pmd_anonymous_page+0x654/0xce0 mm/huge_memory.c:771 create_huge_pmd mm/memory.c:4238 [inline] __handle_mm_fault mm/memory.c:4473 [inline] handle_mm_fault+0x207e/0x2620 mm/memory.c:4600 do_user_addr_fault+0x8ce/0x1120 arch/x86/mm/fault.c:1390 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0xa1/0x1e0 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 1f 00 66 89 01 31 c9 0f 1f 00 c3 0f 1f 44 00 00 48 bb fd ef ff ff ff 7f 00 00 48 39 d9 73 34 0f 1f 00 <89> 01 31 c9 0f 1f 00 c3 66 0f 1f 44 00 00 48 bb f9 ef ff ff ff 7f RSP: 0018:ffffc90001acfdf8 EFLAGS: 00010297 RAX: 0000000000000003 RBX: 00007fffffffeffd RCX: 00000000200000c0 RDX: 1ffff92000359fa8 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90001acfef0 R08: dffffc0000000000 R09: fffffbfff1c704b6 R10: fffffbfff1c704b6 R11: 0000000000000000 R12: 00000000200000c0 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000004 __sys_socketpair+0x138/0xde0 net/socket.c:1546 __do_sys_socketpair net/socket.c:1612 [inline] __se_sys_socketpair net/socket.c:1609 [inline] __x64_sys_socketpair+0x97/0xb0 net/socket.c:1609 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 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:00007fd932336188 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 000000000000001e RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000200000c0 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffdf782f1bf R14: 00007fd932336300 R15: 0000000000022000