watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.6:6979] Modules linked in: irq event stamp: 4514257 hardirqs last enabled at (4514256): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 hardirqs last disabled at (4514257): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1095 softirqs last enabled at (4504202): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (4504205): [] asm_call_irq_on_stack+0x12/0x20 CPU: 0 PID: 6979 Comm: syz-executor.6 Not tainted 5.10.155 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__sanitizer_cov_trace_pc+0x55/0x60 kernel/kcov.c:207 Code: 82 40 13 00 00 83 f8 02 75 20 48 8b 8a 48 13 00 00 8b 92 44 13 00 00 48 8b 01 48 83 c0 01 48 39 c2 76 07 48 89 34 c1 48 89 01 c6 15 e0 02 66 0f 1f 44 00 00 41 55 41 54 49 89 fc 55 48 bd eb RSP: 0018:ffff88806ce09b88 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff82c4b6a1 RDX: ffff88800fbccc80 RSI: ffffffff82c4b6af RDI: 0000000000000007 RBP: ffff88800fb2f698 R08: 0000000000000001 R09: ffff88806ce09c50 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800fb2f640 R13: ffff888043d3b3f0 R14: 0000000000000000 R15: ffff888043d3b1c0 FS: 00007f9d7bd54700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd902e9d48 CR3: 00000000454f4000 CR4: 0000000000350ef0 Call Trace: mac80211_hwsim_tx_frame_no_nl.isra.0+0x4bf/0x13d0 drivers/net/wireless/mac80211_hwsim.c:1425 mac80211_hwsim_tx_frame+0x152/0x1e0 drivers/net/wireless/mac80211_hwsim.c:1711 mac80211_hwsim_beacon_tx+0x494/0x8f0 drivers/net/wireless/mac80211_hwsim.c:1765 __iterate_interfaces+0x1f0/0x530 net/mac80211/util.c:792 ieee80211_iterate_active_interfaces_atomic+0x72/0x180 net/mac80211/util.c:828 mac80211_hwsim_beacon+0xd1/0x1d0 drivers/net/wireless/mac80211_hwsim.c:1788 __run_hrtimer kernel/time/hrtimer.c:1583 [inline] __hrtimer_run_queues+0x5e8/0xb50 kernel/time/hrtimer.c:1647 hrtimer_run_softirq+0x148/0x310 kernel/time/hrtimer.c:1664 __do_softirq+0x1b8/0x86b kernel/softirq.c:298 asm_call_irq_on_stack+0x12/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x80/0xa0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x114/0x1b0 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x43/0xa0 arch/x86/kernel/apic/apic.c:1095 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:cmpxchg_double_slab mm/slub.c:402 [inline] RIP: 0010:__slab_free+0xb5/0x5d0 mm/slub.c:3023 Code: 85 ed 89 c6 41 0f 94 c1 66 45 85 ff 74 08 45 31 f6 45 84 c9 74 0c 45 31 f6 40 84 f6 0f 84 e7 00 00 00 48 8b 8c 24 88 00 00 00 <41> f6 40 0b 40 74 61 48 83 7c 24 50 00 0f 85 0a 03 00 00 48 89 da RSP: 0018:ffff88804745f9c0 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 0000000080120010 RCX: 000000008012000f RDX: ffff88803db0ef30 RSI: 0000000000000001 RDI: ffff888007c4d640 RBP: ffff88804745faa0 R08: ffff888007c4d640 R09: ffffffff816bd000 R10: ffff88803db0ef30 R11: 0000000000000001 R12: ffffea0000f6c380 R13: ffff88803db0ea20 R14: 0000000000000000 R15: 000000008012000f qlink_free mm/kasan/quarantine.c:151 [inline] qlist_free_all+0x59/0xe0 mm/kasan/quarantine.c:170 quarantine_reduce+0x184/0x210 mm/kasan/quarantine.c:267 __kasan_kmalloc.constprop.0+0xa2/0xd0 mm/kasan/common.c:442 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:664 [inline] fib_default_rule_add+0x4e/0x400 net/core/fib_rules.c:60 fib_default_rules_init net/ipv4/fib_rules.c:400 [inline] fib4_rules_init+0x7e/0x1c0 net/ipv4/fib_rules.c:418 ip_fib_net_init net/ipv4/fib_frontend.c:1533 [inline] fib_net_init+0x15b/0x320 net/ipv4/fib_frontend.c:1586 ops_init+0xbb/0x680 net/core/net_namespace.c:153 setup_net+0x2d8/0x810 net/core/net_namespace.c:351 copy_net_ns+0x2ca/0x5e0 net/core/net_namespace.c:492 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:231 ksys_unshare+0x449/0x8a0 kernel/fork.c:2960 __do_sys_unshare kernel/fork.c:3028 [inline] __se_sys_unshare kernel/fork.c:3026 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3026 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f9d7e7deb19 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:00007f9d7bd54188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f9d7e8f1f60 RCX: 00007f9d7e7deb19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 00007f9d7e838f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffc2a9c4df R14: 00007f9d7bd54300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 1 skipped: idling at default_idle+0xe/0x20 arch/x86/kernel/process.c:689 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 40 13 00 rex adc (%rax),%eax 3: 00 83 f8 02 75 20 add %al,0x207502f8(%rbx) 9: 48 8b 8a 48 13 00 00 mov 0x1348(%rdx),%rcx 10: 8b 92 44 13 00 00 mov 0x1344(%rdx),%edx 16: 48 8b 01 mov (%rcx),%rax 19: 48 83 c0 01 add $0x1,%rax 1d: 48 39 c2 cmp %rax,%rdx 20: 76 07 jbe 0x29 22: 48 89 34 c1 mov %rsi,(%rcx,%rax,8) 26: 48 89 01 mov %rax,(%rcx) * 29: e9 c6 15 e0 02 jmpq 0x2e015f4 <-- trapping instruction 2e: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) 34: 41 55 push %r13 36: 41 54 push %r12 38: 49 89 fc mov %rdi,%r12 3b: 55 push %rbp 3c: 48 rex.W 3d: bd .byte 0xbd 3e: eb .byte 0xeb