BUG: sleeping function called from invalid context at mm/vmalloc.c:3409 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5385, name: udevd preempt_count: 1, expected: 0 RCU nest depth: 1, expected: 0 1 lock held by udevd/5385: #0: ffffffff8e5c10e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e5c10e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8e5c10e0 (rcu_read_lock){....}-{1:3}, at: sock_def_readable+0x97/0x600 net/core/sock.c:3561 Preemption disabled at: [] preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 CPU: 0 UID: 0 PID: 5385 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120 __might_resched+0x3c0/0x5e0 kernel/sched/core.c:8957 vfree+0x75/0xb50 mm/vmalloc.c:3409 futex_hash_free+0x98/0xc0 kernel/futex/core.c:1742 __mmdrop+0x33f/0x580 kernel/fork.c:692 mmdrop include/linux/sched/mm.h:55 [inline] mmdrop_sched include/linux/sched/mm.h:83 [inline] mmdrop_lazy_tlb_sched include/linux/sched/mm.h:110 [inline] finish_task_switch.isra.0+0x7a4/0xc10 kernel/sched/core.c:5250 context_switch kernel/sched/core.c:5360 [inline] __schedule+0x1198/0x5de0 kernel/sched/core.c:6961 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7145 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:194 sock_def_readable+0x15b/0x600 net/core/sock.c:3564 __netlink_sendskb net/netlink/af_netlink.c:1265 [inline] netlink_sendskb net/netlink/af_netlink.c:1271 [inline] netlink_unicast+0x75c/0x870 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg net/socket.c:729 [inline] ____sys_sendmsg+0xa98/0xc70 net/socket.c:2614 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2668 __sys_sendmsg+0x16d/0x220 net/socket.c:2700 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff20c6a7407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffceb6e6da0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ff20cea7880 RCX: 00007ff20c6a7407 RDX: 0000000000000000 RSI: 00007ffceb6e6e00 RDI: 0000000000000004 RBP: 000055f5c1f58b30 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000000b3 R13: 000055f5c1f469e0 R14: 0000000000000000 R15: 0000000000000000