wlan1: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge) rcu: INFO: rcu_sched detected stalls on CPUs/tasks: rcu: 1-....: (10414 ticks this GP) idle=23a/1/0x4000000000000004 softirq=307903/308005 fqs=5180 rcu: (detected by 0, t=10503 jiffies, g=90777, q=14) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 11968 Comm: syz-executor.2 Not tainted 4.19.152-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:168 [inline] RIP: 0010:lock_acquire+0x15f/0x3c0 kernel/locking/lockdep.c:3908 Code: 1f 1e da 09 0f 82 95 01 00 00 4c 8b 4c 24 08 44 89 ea 6a 00 48 89 ef 6a 00 45 89 f8 44 89 f1 44 89 e6 ff 74 24 60 ff 74 24 18 <49> c1 e9 09 49 83 f1 01 41 83 e1 01 e8 d0 a3 ff ff 48 b8 00 00 00 RSP: 0018:ffff8880ba107ca0 EFLAGS: 00000002 RAX: 0000000000000000 RBX: ffff88801e0d44c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880ba107d48 RBP: ffff8880ba107d48 R08: 0000000000000001 R09: 0000000000000282 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 0000000001a3c940(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004fbd30 CR3: 0000000238e88000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: call_timer_fn+0x113/0x700 kernel/time/timer.c:1335 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1703 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1716 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:zap_pte_range mm/memory.c:1349 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1452 [inline] RIP: 0010:zap_pud_range mm/memory.c:1481 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1502 [inline] RIP: 0010:unmap_page_range+0x12cf/0x2a70 mm/memory.c:1523 Code: c7 a4 d6 ff c1 fb 1f 83 e3 03 e8 8c a3 d6 ff 48 8b 84 24 a0 00 00 00 48 63 db 48 8d 3c 98 48 89 f8 48 c1 e8 03 42 0f b6 14 30 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 19 14 00 00 83 RSP: 0018:ffff88822f947768 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13 RAX: 1ffff11045f28f0d RBX: 0000000000000000 RCX: ffffffff818e2919 RDX: 0000000000000000 RSI: ffffffff818e2924 RDI: ffff88822f947868 RBP: ffffea000283c808 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: dead000000000100 R13: ffffea000283c800 R14: dffffc0000000000 R15: 00007f9926c92000 unmap_single_vma+0x198/0x300 mm/memory.c:1568 unmap_vmas+0xa9/0x180 mm/memory.c:1598 exit_mmap+0x2b9/0x530 mm/mmap.c:3093 __mmput kernel/fork.c:1015 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1036 exit_mm kernel/exit.c:546 [inline] do_exit+0xab5/0x2b70 kernel/exit.c:874 do_group_exit+0x125/0x310 kernel/exit.c:990 get_signal+0x3f2/0x1f70 kernel/signal.c:2588 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45de59 Code: Bad RIP value. RSP: 002b:00007ffc63c47c98 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffff5 RBX: 000000000000002d RCX: 000000000045de59 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000118bf2c RBP: 000000000118bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffc63c47d70 R11: 0000000000000246 R12: 00000000001f301a R13: 00000000001f2fed R14: 00000000000003e8 R15: 000000000118bf2c