watchdog: BUG: soft lockup - CPU#0 stuck for 134s! [syz-executor.4:19821] Modules linked in: irq event stamp: 19393951 hardirqs last enabled at (19393950): [] asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:654 hardirqs last disabled at (19393951): [] sysvec_apic_timer_interrupt+0xc/0x100 arch/x86/kernel/apic/apic.c:1096 softirqs last enabled at (5826588): [] asm_call_irq_on_stack+0xf/0x20 softirqs last disabled at (5826591): [] asm_call_irq_on_stack+0xf/0x20 CPU: 0 PID: 19821 Comm: syz-executor.4 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:compound_head include/linux/page-flags.h:187 [inline] RIP: 0010:virt_to_head_page include/linux/mm.h:876 [inline] RIP: 0010:kmem_cache_free+0x6e/0x350 mm/slub.c:3158 Code: e8 0c 48 89 e6 4c 89 24 24 48 c7 44 24 08 00 00 00 00 49 89 c5 48 b8 00 00 00 00 00 ea ff ff 49 c1 e5 06 49 01 c5 49 8b 45 08 <48> 8d 50 ff a8 01 4c 0f 45 ea 48 8d 54 24 08 e8 1e 7f ff ff 84 c0 RSP: 0018:ffffc90000007c68 EFLAGS: 00000286 RAX: dead000000000100 RBX: 0000000000000000 RCX: 0000000000000100 RDX: ffff888018a30000 RSI: ffffc90000007c68 RDI: ffff8881406f7c80 RBP: ffff8881406f7c80 R08: 0000000000000000 R09: 0000000000000030 R10: ffffffff8132e02a R11: 000000000000003f R12: ffff888068ba7a00 R13: ffffea0001a2e9c0 R14: ffffffff86f0ebcf R15: ffff888074280cd0 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000749138 CR3: 0000000068ba6000 CR4: 0000000000350ef0 DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:632 __kfree_skb net/core/skbuff.c:689 [inline] consume_skb net/core/skbuff.c:844 [inline] consume_skb+0xcf/0x160 net/core/skbuff.c:838 mac80211_hwsim_tx_frame+0x157/0x1e0 drivers/net/wireless/mac80211_hwsim.c:1706 mac80211_hwsim_beacon_tx+0x4ba/0x910 drivers/net/wireless/mac80211_hwsim.c:1759 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0x8d/0x170 net/mac80211/util.c:829 mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1782 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x609/0xe40 kernel/time/hrtimer.c:1583 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/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+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:mm_update_next_owner+0x44e/0x7a0 kernel/exit.c:388 Code: fb ff ff 48 89 f8 48 c1 e8 03 0f b6 14 18 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 b5 02 00 00 44 8b b5 dc fb ff ff <31> ff 41 81 e6 00 00 20 00 44 89 f6 e8 91 b6 2e 00 45 85 f6 0f 85 RSP: 0018:ffffc90002697b18 EFLAGS: 00000246 RAX: 0000000000000007 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81441a70 RDI: ffff888018e937ac RBP: ffff888018e93bd0 R08: 0000000000000000 R09: ffffffff8b00a083 R10: ffffffff81441aaf R11: 0000000000000001 R12: ffff88801a6a3100 R13: ffff888018e93780 R14: 0000000000404100 R15: ffff888021874e10 exit_mm kernel/exit.c:500 [inline] do_exit+0xb62/0x2ae0 kernel/exit.c:812 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x3e9/0x20a0 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: Unable to access opcode bytes at RIP 0x45e1ef. RSP: 002b:00007f42a7f82cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000119c180 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000119c180 RBP: 000000000119c178 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c184 R13: 00007ffdc678ffff R14: 00007f42a7f839c0 R15: 000000000119c184 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 19822 Comm: syz-executor.4 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:queued_write_lock_slowpath+0x131/0x270 kernel/locking/qrwlock.c:77 Code: 00 00 00 00 fc ff df 49 01 c7 41 83 c6 03 41 0f b6 07 41 38 c6 7c 08 84 c0 0f 85 fe 00 00 00 8b 03 3d 00 01 00 00 74 19 f3 90 <41> 0f b6 07 41 38 c6 7c ec 84 c0 74 e8 48 89 df e8 2a fd 5b 00 eb RSP: 0018:ffffc900026a7a60 EFLAGS: 00000006 RAX: 0000000000000300 RBX: ffffffff8b00a080 RCX: ffffffff8159871a RDX: fffffbfff1601411 RSI: 0000000000000004 RDI: ffffffff8b00a080 RBP: 00000000000000ff R08: 0000000000000001 R09: ffffffff8b00a083 R10: fffffbfff1601410 R11: 0000000000000000 R12: 1ffff920004d4f4d R13: ffffffff8b00a084 R14: 0000000000000003 R15: fffffbfff1601410 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f42a7f61db8 CR3: 0000000068ba6000 CR4: 0000000000350ee0 Call Trace: queued_write_lock include/asm-generic/qrwlock.h:95 [inline] do_raw_write_lock+0x1ce/0x280 kernel/locking/spinlock_debug.c:207 exit_notify kernel/exit.c:667 [inline] do_exit+0xcaa/0x2ae0 kernel/exit.c:845 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x3e9/0x20a0 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: Unable to access opcode bytes at RIP 0x45e1ef. RSP: 002b:00007f42a7f61cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000119c228 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000119c228 RBP: 000000000119c220 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c22c R13: 00007ffdc678ffff R14: 00007f42a7f629c0 R15: 000000000119c22c