============================= WARNING: suspicious RCU usage 5.13.0-rc5-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.5/10217: #0: ffff888020c14758 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] #0: ffff888020c14758 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x2d8/0x1120 arch/x86/mm/fault.c:1331 stack backtrace: CPU: 0 PID: 10217 Comm: syz-executor.5 Not tainted 5.13.0-rc5-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 do_user_addr_fault+0x308/0x1120 arch/x86/mm/fault.c:1348 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: 0033:0x4123e7 Code: 0a 00 00 49 69 c7 b8 00 00 00 80 7b f8 00 44 89 7c 24 34 48 8d 6b f4 48 89 5c 24 28 48 89 44 24 40 75 bc 80 3d 29 ed 12 00 01 43 f8 01 b9 40 42 0f 00 48 89 de 48 19 c0 44 89 7b f4 ba 81 00 RSP: 002b:00007ffde3b11b10 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 000000000056bf8c RCX: 0000000000000000 RDX: 00007ffde3b11c58 RSI: 0000000000000000 RDI: 00007ffde3b11c98 RBP: 000000000056bf80 R08: 0000000000000000 R09: 0000000000000010 R10: 00007ffde3b6e0b8 R11: 0000000000000016 R12: 0000000000570030 R13: 00007ffde3b11c10 R14: 000000000056bf80 R15: 0000000000000000