rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10334 ticks this GP) idle=1aa/1/0x4000000000000000 softirq=263639/263643 fqs=1096 (t=10500 jiffies g=522765 q=678) NMI backtrace for cpu 0 CPU: 0 PID: 8759 Comm: syz-executor.0 Not tainted 5.14.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:342 print_cpu_stall kernel/rcu/tree_stall.h:625 [inline] check_cpu_stall kernel/rcu/tree_stall.h:700 [inline] rcu_pending kernel/rcu/tree.c:3922 [inline] rcu_sched_clock_irq.cold+0x9f/0x747 kernel/rcu/tree.c:2641 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1601 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:mac80211_hwsim_tx_frame_no_nl.isra.0+0x77b/0x1330 drivers/net/wireless/mac80211_hwsim.c:1527 Code: 00 00 00 c6 84 24 98 00 00 00 00 74 bb e8 6d 2e 43 fc 48 8d bb ac 3c 00 00 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 0f b6 04 28 <38> d0 7f 08 84 c0 0f 85 36 09 00 00 44 0f b6 bb ac 3c 00 00 31 ff RSP: 0018:ffffc90000007ba0 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff888029a332a0 RCX: 0000000000000100 RDX: 0000000000000004 RSI: ffffffff85327a83 RDI: ffff888029a36f4c RBP: dffffc0000000000 R08: 0000000000000007 R09: 0000000000000000 R10: ffffffff85327ab9 R11: 0000000000000000 R12: ffff888072ac3a00 R13: ffff888036f4b4d0 R14: ffff888036f4b2a0 R15: 0000000000000000 mac80211_hwsim_tx_frame+0x1ee/0x2a0 drivers/net/wireless/mac80211_hwsim.c:1784 mac80211_hwsim_beacon_tx+0x49b/0x930 drivers/net/wireless/mac80211_hwsim.c:1838 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829 mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1861 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1601 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1618 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:197 Code: 01 f0 4d 89 03 e9 63 fd ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 00 <65> 8b 05 09 47 8c 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b RSP: 0018:ffffc900018af1d0 EFLAGS: 00000216 RAX: 000000000000b597 RBX: 0000000000000000 RCX: ffffc90002ec2000 RDX: 0000000000040000 RSI: ffffffff815d5343 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8fcd58e7 R10: ffffffff815d5339 R11: 0000000000000000 R12: ffffffff84c53da0 R13: 0000000000000200 R14: dffffc0000000000 R15: ffffc900018af230 console_unlock+0x7c9/0xc40 kernel/printk/printk.c:2653 vprintk_emit+0x1ca/0x560 kernel/printk/printk.c:2174 vprintk+0x8d/0x260 kernel/printk/printk_safe.c:392 printk+0xba/0xed kernel/printk/printk.c:2216 __nla_validate_parse.cold+0x6d/0xaa lib/nlattr.c:600 __nla_parse+0x3d/0x50 lib/nlattr.c:685 __nlmsg_parse include/net/netlink.h:733 [inline] genl_family_rcv_msg_attrs_parse.constprop.0+0x1ab/0x290 net/netlink/genetlink.c:548 genl_family_rcv_msg_doit+0xda/0x320 net/netlink/genetlink.c:717 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2394 ___sys_sendmsg+0xf3/0x170 net/socket.c:2448 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2477 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 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:00007fd3e2f0a188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffed03bc61f R14: 00007fd3e2f0a300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 c6 add %al,%dh 4: 84 24 98 test %ah,(%rax,%rbx,4) 7: 00 00 add %al,(%rax) 9: 00 00 add %al,(%rax) b: 74 bb je 0xffffffc8 d: e8 6d 2e 43 fc callq 0xfc432e7f 12: 48 8d bb ac 3c 00 00 lea 0x3cac(%rbx),%rdi 19: 48 89 f8 mov %rdi,%rax 1c: 48 89 fa mov %rdi,%rdx 1f: 48 c1 e8 03 shr $0x3,%rax 23: 83 e2 07 and $0x7,%edx 26: 0f b6 04 28 movzbl (%rax,%rbp,1),%eax * 2a: 38 d0 cmp %dl,%al <-- trapping instruction 2c: 7f 08 jg 0x36 2e: 84 c0 test %al,%al 30: 0f 85 36 09 00 00 jne 0x96c 36: 44 0f b6 bb ac 3c 00 movzbl 0x3cac(%rbx),%r15d 3d: 00 3e: 31 ff xor %edi,%edi