watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.3:5386] Modules linked in: irq event stamp: 5141435 hardirqs last enabled at (5141434): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 hardirqs last disabled at (5141435): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1106 softirqs last enabled at (5133792): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (5133795): [] asm_call_irq_on_stack+0x12/0x20 CPU: 0 PID: 5386 Comm: syz-executor.3 Not tainted 5.10.234 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__orc_find+0x9f/0xf0 arch/x86/kernel/unwind_orc.c:59 Code: 83 c0 03 38 d0 7c 04 84 d2 75 50 48 63 03 48 01 d8 48 39 c1 73 b0 4c 8d 63 fc 49 39 ec 73 b3 4d 29 ee 49 c1 fe 02 4b 8d 04 76 <48> 8d 04 46 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f e9 ca d3 0f RSP: 0018:ffff88806ce09770 EFLAGS: 00000212 RAX: 000000000000000c RBX: ffffffff857252e4 RCX: ffffffff816c28ed RDX: 0000000000000000 RSI: ffffffff85a15856 RDI: ffffffff857252d4 RBP: ffffffff857252e8 R08: ffffffff85a15856 R09: ffffffff85a15874 R10: 0000000000032042 R11: 1ffff1100d9c12ff R12: ffffffff857252e4 R13: ffffffff857252d4 R14: 0000000000000004 R15: dffffc0000000000 FS: 00007fd64d867700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556e9f6df000 CR3: 00000000464a8000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 00000000dddd06aa Call Trace: orc_find arch/x86/kernel/unwind_orc.c:178 [inline] unwind_next_frame+0x2b3/0x1a90 arch/x86/kernel/unwind_orc.c:448 arch_stack_walk+0x83/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0x110/0x160 mm/kasan/common.c:422 slab_free_hook mm/slub.c:1542 [inline] slab_free_freelist_hook+0xa9/0x180 mm/slub.c:1576 slab_free mm/slub.c:3149 [inline] kmem_cache_free+0xa7/0x2d0 mm/slub.c:3165 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:638 __kfree_skb net/core/skbuff.c:695 [inline] consume_skb net/core/skbuff.c:850 [inline] consume_skb+0x11d/0x2b0 net/core/skbuff.c:844 mac80211_hwsim_tx_frame+0x15a/0x1e0 drivers/net/wireless/mac80211_hwsim.c:1717 mac80211_hwsim_beacon_tx+0x494/0x940 drivers/net/wireless/mac80211_hwsim.c:1770 __iterate_interfaces+0x1f0/0x550 net/mac80211/util.c:792 ieee80211_iterate_active_interfaces_atomic+0x71/0x1c0 net/mac80211/util.c:828 mac80211_hwsim_beacon+0xd1/0x1d0 drivers/net/wireless/mac80211_hwsim.c:1793 __run_hrtimer kernel/time/hrtimer.c:1586 [inline] __hrtimer_run_queues+0x632/0xb40 kernel/time/hrtimer.c:1650 hrtimer_run_softirq+0x148/0x310 kernel/time/hrtimer.c:1667 __do_softirq+0x1b8/0x7c9 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:1106 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:cmpxchg_double_slab mm/slub.c:403 [inline] RIP: 0010:__slab_free+0xdd/0x5d0 mm/slub.c:3023 Code: 00 00 41 f6 40 0b 40 74 61 48 83 7c 24 50 00 0f 85 0a 03 00 00 48 89 da 48 8b 7c 24 48 48 8b 5c 24 58 4c 89 e8 f0 48 0f c7 0f <0f> 84 f1 01 00 00 f3 90 4d 85 f6 0f 84 6e ff ff ff 48 8b 34 24 4c RSP: 0018:ffff888048847900 EFLAGS: 00000246 RAX: ffff88800ca7f7a0 RBX: ffff88800ca7ebd0 RCX: 0000000080120010 RDX: 0000000080120011 RSI: 0000000000000001 RDI: ffffea0000329fa0 RBP: ffff8880488479d8 R08: ffff88800804d640 R09: ffffffff816cb300 R10: ffff88800ca7ebd0 R11: 0000000000000001 R12: ffffea0000329f80 R13: ffff88800ca7f7a0 R14: 0000000000000000 R15: 0000000080120010 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 slab_post_alloc_hook mm/slab.h:532 [inline] slab_alloc_node mm/slub.c:2896 [inline] slab_alloc mm/slub.c:2904 [inline] kmem_cache_alloc_trace+0x133/0x320 mm/slub.c:2921 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] kobject_uevent_env+0x22b/0xfd0 lib/kobject_uevent.c:539 device_del+0xa8f/0x1180 drivers/base/core.c:3200 unregister_netdevice_many+0xbb7/0x1490 net/core/dev.c:10778 unregister_netdevice_queue+0x201/0x2c0 net/core/dev.c:10685 unregister_netdevice include/linux/netdevice.h:2891 [inline] __tun_detach+0xfc1/0x12b0 drivers/net/tun.c:697 tun_detach drivers/net/tun.c:713 [inline] tun_chr_close+0xc4/0x250 drivers/net/tun.c:3486 __fput+0x285/0x9f0 fs/file_table.c:281 task_work_run+0xe2/0x1a0 kernel/task_work.c:185 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x186/0x190 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x38/0x1d0 kernel/entry/common.c:274 entry_SYSCALL_64_after_hwframe+0x67/0xd1 RIP: 0033:0x7fd6502f1b19 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:00007fd64d867188 EFLAGS: 00000246 ORIG_RAX: 0000000000000124 RAX: 0000000000000003 RBX: 00007fd650404f60 RCX: 00007fd6502f1b19 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 00007fd65034bf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffead0cb0f R14: 00007fd64d867300 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:706 ---------------- Code disassembly (best guess): 0: 83 c0 03 add $0x3,%eax 3: 38 d0 cmp %dl,%al 5: 7c 04 jl 0xb 7: 84 d2 test %dl,%dl 9: 75 50 jne 0x5b b: 48 63 03 movslq (%rbx),%rax e: 48 01 d8 add %rbx,%rax 11: 48 39 c1 cmp %rax,%rcx 14: 73 b0 jae 0xffffffc6 16: 4c 8d 63 fc lea -0x4(%rbx),%r12 1a: 49 39 ec cmp %rbp,%r12 1d: 73 b3 jae 0xffffffd2 1f: 4d 29 ee sub %r13,%r14 22: 49 c1 fe 02 sar $0x2,%r14 26: 4b 8d 04 76 lea (%r14,%r14,2),%rax * 2a: 48 8d 04 46 lea (%rsi,%rax,2),%rax <-- trapping instruction 2e: 48 83 c4 10 add $0x10,%rsp 32: 5b pop %rbx 33: 5d pop %rbp 34: 41 5c pop %r12 36: 41 5d pop %r13 38: 41 5e pop %r14 3a: 41 5f pop %r15 3c: e9 .byte 0xe9 3d: ca d3 0f lret $0xfd3