RDX: 0000000020000000 RSI: 00000000400454ca RDI: 0000000000000004 RBP: 00007ff4dd6941d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffc73776c4f R14: 00007ff4dd694300 R15: 0000000000022000 watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.0:9226] Modules linked in: irq event stamp: 9128567 hardirqs last enabled at (9128566): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 hardirqs last disabled at (9128567): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1095 softirqs last enabled at (9092802): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (9092805): [] asm_call_irq_on_stack+0x12/0x20 CPU: 1 PID: 9226 Comm: syz-executor.0 Not tainted 5.10.159 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:deref_stack_reg+0x10e/0x160 arch/x86/kernel/unwind_orc.c:362 Code: fc ff df 48 89 d9 48 89 ef e8 de f8 ff ff 48 c1 e9 03 80 3c 11 00 75 35 48 89 03 b8 01 00 00 00 48 83 c4 08 5b 5d 41 5c 41 5d fd bd 0f 03 e8 88 57 5b 00 e9 17 ff ff ff e8 8e 57 5b 00 e9 5a RSP: 0018:ffff88806cf097f0 EFLAGS: 00000292 RAX: 0000000000000001 RBX: 0000000000000002 RCX: 1ffff1100d9e1322 RDX: dffffc0000000000 RSI: ffff88806cf09db8 RDI: ffff88806cf09db8 RBP: ffff88806cf09905 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000032042 R11: 1ffff1100d9e1307 R12: ffff88806cf09de8 R13: ffff88806cf098d0 R14: 1ffff1100d9e1307 R15: ffffffff85d018ac FS: 00007f41d7c9d700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff4dd693f78 CR3: 000000004753e000 CR4: 0000000000350ee0 Call Trace: unwind_next_frame+0x1289/0x1a90 arch/x86/kernel/unwind_orc.c:589 arch_stack_walk+0x83/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 __save_stack_trace mm/kmemleak.c:563 [inline] create_object.isra.0+0x372/0xa20 mm/kmemleak.c:618 kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline] slab_post_alloc_hook mm/slab.h:534 [inline] slab_alloc_node mm/slub.c:2896 [inline] slab_alloc mm/slub.c:2904 [inline] kmem_cache_alloc+0x159/0x360 mm/slub.c:2909 __skb_ext_alloc+0x19/0x90 net/core/skbuff.c:6225 skb_ext_add+0x508/0x670 net/core/skbuff.c:6320 skb_set_kcov_handle include/linux/skbuff.h:4632 [inline] skb_set_kcov_handle include/linux/skbuff.h:4622 [inline] __alloc_skb+0x3c1/0x620 net/core/skbuff.c:253 __netdev_alloc_skb+0x6e/0x360 net/core/skbuff.c:446 netdev_alloc_skb include/linux/skbuff.h:2836 [inline] dev_alloc_skb include/linux/skbuff.h:2849 [inline] __ieee80211_beacon_get+0x3af/0x13a0 net/mac80211/tx.c:4874 ieee80211_beacon_get_tim+0x88/0x910 net/mac80211/tx.c:4988 ieee80211_beacon_get include/net/mac80211.h:4912 [inline] mac80211_hwsim_beacon_tx+0x111/0x8f0 drivers/net/wireless/mac80211_hwsim.c:1740 __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:1793 __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:compound_head include/linux/page-flags.h:187 [inline] RIP: 0010:release_pages+0xe6/0xc20 mm/swap.c:892 Code: 08 49 bd 00 00 00 00 00 fc ff df e8 a4 0f ea ff 49 8d 7f 08 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 b7 09 00 00 4d 8b 67 08 <31> ff 4c 89 e3 83 e3 01 48 89 de e8 ea 08 ea ff 48 85 db 0f 85 b2 RSP: 0018:ffff88804efd7930 EFLAGS: 00000246 RAX: 1ffffd400019dbf9 RBX: 00000000000001fe RCX: ffffc9000080b000 RDX: 0000000000040000 RSI: ffffffff81561f3c RDI: ffffea0000cedfc8 RBP: 0000000000000017 R08: 0000000000000001 R09: ffffea0000d3cb37 R10: 00000000000001fe R11: 0000000000000001 R12: dead000000000100 R13: dffffc0000000000 R14: ffff888047cd30d0 R15: ffffea0000cedfc0 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu mm/mmu_gather.c:247 [inline] tlb_finish_mmu+0x165/0x8f0 mm/mmu_gather.c:326 exit_mmap+0x29f/0x4f0 mm/mmap.c:3237 __mmput kernel/fork.c:1089 [inline] mmput+0xca/0x340 kernel/fork.c:1110 copy_process+0x494b/0x66f0 kernel/fork.c:2347 kernel_clone+0xe7/0xa20 kernel/fork.c:2467 __do_sys_fork+0x8a/0xc0 kernel/fork.c:2530 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f41da727b19 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:00007f41d7c9d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000039 RAX: ffffffffffffffda RBX: 00007f41da83af60 RCX: 00007f41da727b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f41da781f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff13dbda8f R14: 00007f41d7c9d300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle+0xe/0x20 arch/x86/kernel/process.c:689 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: df 48 89 fisttps -0x77(%rax) 3: d9 48 89 (bad) -0x77(%rax) 6: ef out %eax,(%dx) 7: e8 de f8 ff ff callq 0xfffff8ea c: 48 c1 e9 03 shr $0x3,%rcx 10: 80 3c 11 00 cmpb $0x0,(%rcx,%rdx,1) 14: 75 35 jne 0x4b 16: 48 89 03 mov %rax,(%rbx) 19: b8 01 00 00 00 mov $0x1,%eax 1e: 48 83 c4 08 add $0x8,%rsp 22: 5b pop %rbx 23: 5d pop %rbp 24: 41 5c pop %r12 26: 41 5d pop %r13 * 28: e9 fd bd 0f 03 jmpq 0x30fbe2a <-- trapping instruction 2d: e8 88 57 5b 00 callq 0x5b57ba 32: e9 17 ff ff ff jmpq 0xffffff4e 37: e8 8e 57 5b 00 callq 0x5b57ca 3c: e9 .byte 0xe9 3d: 5a pop %rdx