mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium watchdog: BUG: soft lockup - CPU#0 stuck for 21s! [syz-executor.2:23837] Modules linked in: irq event stamp: 2503445 hardirqs last enabled at (2503444): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (2503444): [] _raw_spin_unlock_irqrestore+0x79/0xe0 kernel/locking/spinlock.c:184 hardirqs last disabled at (2503445): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (2490490): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (2490495): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (2490495): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 23837 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ieee80211_rx_napi+0x121/0x2470 net/mac80211/rx.c:4570 Code: 9f c1 f9 80 fb 02 0f 87 04 89 73 00 e8 78 9e c1 f9 49 8d 7e 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 eb 1f 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 6e 38 48 8d RSP: 0018:ffff8880ba007d00 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87a0e6ea RDX: 1ffff11012b1223f RSI: ffffffff87a0e6f8 RDI: ffff8880958911f8 RBP: ffff8880958917d8 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888097404b80 R13: ffff8880958911c0 R14: ffff8880958911c0 R15: ffff888097404b80 FS: 00007f3675b62700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f51fb7f3718 CR3: 0000000009e6d000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ieee80211_rx include/net/mac80211.h:4109 [inline] ieee80211_tasklet_handler+0x101/0x160 net/mac80211/main.c:229 tasklet_action_common.constprop.0+0x265/0x360 kernel/softirq.c:522 __do_softirq+0x265/0x980 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:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:write_comp_data+0x6/0x70 kernel/kcov.c:121 Code: 00 00 8b 80 64 13 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 c3 0f 1f 84 00 00 00 00 00 49 89 f1 49 89 fa <65> 48 8b 34 25 c0 df 01 00 65 8b 05 7a 59 9f 7e a9 00 01 1f 00 75 RSP: 0018:ffff8880304f7a20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffffd40004be071 RBX: 0000000000000000 RCX: ffffffff818ba5e7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffffea00025f0388 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: dead000000000100 R13: ffffea00025f0380 R14: dffffc0000000000 R15: 00007f3676cd7000 page_mapcount include/linux/mm.h:640 [inline] zap_pte_range mm/memory.c:1351 [inline] zap_pmd_range mm/memory.c:1463 [inline] zap_pud_range mm/memory.c:1492 [inline] zap_p4d_range mm/memory.c:1513 [inline] unmap_page_range+0x19e7/0x2c50 mm/memory.c:1534 unmap_single_vma+0x198/0x300 mm/memory.c:1579 unmap_vmas+0xa9/0x180 mm/memory.c:1609 exit_mmap+0x2b9/0x530 mm/mmap.c:3093 __mmput kernel/fork.c:1016 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1037 exit_mm kernel/exit.c:549 [inline] do_exit+0xaec/0x2be0 kernel/exit.c:857 do_group_exit+0x125/0x310 kernel/exit.c:967 __do_sys_exit_group kernel/exit.c:978 [inline] __se_sys_exit_group kernel/exit.c:976 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:976 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f36771eceb9 Code: Bad RIP value. RSP: 002b:00007f3675b60f38 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f3675b610d0 RCX: 00007f36771eceb9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000043 RBP: 00007f3677245f80 R08: 000000000000001e R09: 00007f3675b610d0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3677236520 R13: 0000000000000016 R14: 00000000000000a8 R15: 0000000000000000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60 ---------------- Code disassembly (best guess): 0: 9f lahf 1: c1 f9 80 sar $0x80,%ecx 4: fb sti 5: 02 0f add (%rdi),%cl 7: 87 04 89 xchg %eax,(%rcx,%rcx,4) a: 73 00 jae 0xc c: e8 78 9e c1 f9 callq 0xf9c19e89 11: 49 8d 7e 38 lea 0x38(%r14),%rdi 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 48 89 fa mov %rdi,%rdx 22: 48 c1 ea 03 shr $0x3,%rdx 26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) * 2a: 0f 85 eb 1f 00 00 jne 0x201b <-- trapping instruction 30: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 37: fc ff df 3a: 49 8b 6e 38 mov 0x38(%r14),%rbp 3e: 48 rex.W 3f: 8d .byte 0x8d