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Message-ID: <ckitlqjbhhnspqfvj4wnp4d67h7dw7gsxtntyl6skvyplgxwuf@itqjvgdwbiuh>
Date: Mon, 18 Aug 2025 05:23:22 -0700
From: Breno Leitao <leitao@...ian.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Pavel Begunkov <asml.silence@...il.com>,
Johannes Berg <johannes@...solutions.net>, Mike Galbraith <efault@....de>, paulmck@...nel.org,
LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org, boqun.feng@...il.com
Subject: Re: netconsole: HARDIRQ-safe -> HARDIRQ-unsafe lock order warning
On Fri, Aug 15, 2025 at 10:33:08AM -0700, Jakub Kicinski wrote:
> On Fri, 15 Aug 2025 10:29:00 -0700 Breno Leitao wrote:
> > On Fri, Aug 15, 2025 at 09:42:17AM -0700, Jakub Kicinski wrote:
> > > On Fri, 15 Aug 2025 11:44:45 +0100 Pavel Begunkov wrote:
> > > > On 8/15/25 01:23, Jakub Kicinski wrote:
> > >
> > > I suspect disabling netconsole over WiFi may be the most sensible way out.
> >
> > I believe we might be facing a similar issue with virtio-net.
>
> I could be misremembering but I thought virtio-net try_lock()s.
virtio-net shows the same problem on net-next, as of bab3ce404553de56242
("Merge branch '100GbE' of
git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue")
Chain exists of:
console_owner --> target_list_lock --> _xmit_ETHER#2
Looking at the stack I see it is using try lock:
_raw_spin_trylock (./include/linux/spinlock_api_smp.h:90 kernel/locking/spinlock.c:138)
virtnet_poll (./include/linux/spinlock.h:? ./include/linux/netdevice.h:4684 drivers/net/virtio_net.c:3056 drivers/net/virtio_net.c:3108)
Why would the try_lock() avoid such a problem?
I understand that, whenever the try_lock() succeed, it will reach
a HARDIRQ-unsafe lock (_xmit_ETHER) from a HARDIRQ-safe lock (console
lock), which is the path that should be avoided.
Full lockdep snippet when using virtio-net:
[ 16.284303] ========================================================
[ 16.284303] WARNING: possible irq lock inversion dependency detected
[ 16.284305] 6.17.0-rc1-00216-g059cb8675a8c #8 Tainted: G E
[ 16.284306] --------------------------------------------------------
[ 16.284306] swapper/16/0 just changed the state of lock:
[ 16.284307] ffffffff82d84290 (console_owner){-...}-{0:0}, at: console_flush_all (./include/linux/rcupdate.h:336 ./include/linux/srcu.h:319 kernel/printk/printk.c:288 kernel/printk/printk.c:3203)
[ 16.284315] but this lock took another, HARDIRQ-unsafe lock in the past:
[ 16.284316] (_xmit_ETHER#2){+.-.}-{3:3}
[ 16.284317]
[ 16.284317]
[ 16.284317] and interrupts could create inverse lock ordering between them.
[ 16.284317]
[ 16.284318]
[ 16.284318] other info that might help us debug this:
[ 16.284318] Chain exists of:
[ 16.284318] console_owner --> target_list_lock --> _xmit_ETHER#2
[ 16.284318]
[ 16.284320] Possible interrupt unsafe locking scenario:
[ 16.284320]
[ 16.284321] CPU0 CPU1
[ 16.284321] ---- ----
[ 16.284321] lock(_xmit_ETHER#2);
[ 16.284322] local_irq_disable();
[ 16.284323] lock(console_owner);
[ 16.284323] lock(target_list_lock);
[ 16.284324] <Interrupt>
[ 16.284324] lock(console_owner);
[ 16.284325]
[ 16.284325] *** DEADLOCK ***
[ 16.284325]
[ 16.284325] 2 locks held by swapper/16/0:
[ 16.284326] #0: ffffffff82d842b8 (console_lock){+.+.}-{0:0}, at: irq_work_run_list (kernel/irq_work.c:222 kernel/irq_work.c:252)
[ 16.284330] #1: ffffffff82683d60 (console_srcu){....}-{0:0}, at: console_flush_all (./include/linux/rcupdate.h:336 ./include/linux/srcu.h:319 kernel/printk/printk.c:288 kernel/printk/printk.c:3203)
[ 16.284333]
[ 16.284333] the shortest dependencies between 2nd lock and 1st lock:
[ 16.284336] -> (_xmit_ETHER#2){+.-.}-{3:3} ops: 558 {
[ 16.284340] HARDIRQ-ON-W at:
[ 16.284342] lock_acquire (kernel/locking/lockdep.c:5868)
[ 16.284343] _raw_spin_trylock (./include/linux/spinlock_api_smp.h:90 kernel/locking/spinlock.c:138)
[ 16.284346] virtnet_poll (./include/linux/spinlock.h:? ./include/linux/netdevice.h:4684 drivers/net/virtio_net.c:3056 drivers/net/virtio_net.c:3108)
[ 16.284348] __napi_poll (./arch/x86/include/asm/jump_label.h:36 ./include/trace/events/napi.h:14 net/core/dev.c:7495)
[ 16.284350] net_rx_action (net/core/dev.c:7559 net/core/dev.c:7684)
[ 16.284351] handle_softirqs (./arch/x86/include/asm/jump_label.h:36 ./include/trace/events/irq.h:142 kernel/softirq.c:580)
[ 16.284353] do_softirq (kernel/softirq.c:480)
[ 16.284353] __local_bh_enable_ip (kernel/softirq.c:?)
[ 16.284354] virtnet_napi_enable (drivers/net/virtio_net.c:2874)
[ 16.284356] virtnet_open (drivers/net/virtio_net.c:? drivers/net/virtio_net.c:3211)
[ 16.284357] __dev_open (net/core/dev.c:1682)
[ 16.284358] netif_open (net/core/dev.c:1706)
[ 16.284359] dev_open (net/core/dev_api.c:?)
[ 16.284360] netpoll_setup (net/core/netpoll.c:744)
[ 16.284361] init_netconsole (drivers/net/netconsole.c:1876 drivers/net/netconsole.c:1927)
[ 16.284364] do_one_initcall (init/main.c:1269)
[ 16.284365] do_initcall_level (init/main.c:1330)
[ 16.284367] do_initcalls (init/main.c:1344)
[ 16.284369] kernel_init_freeable (init/main.c:1583)
[ 16.284452] kernel_init (init/main.c:1471)
[ 16.284455] ret_from_fork (arch/x86/kernel/process.c:154)
[ 16.284456] ret_from_fork_asm (arch/x86/entry/entry_64.S:258)
[ 16.284458] IN-SOFTIRQ-W at:
[ 16.284458] lock_acquire (kernel/locking/lockdep.c:5868)
[ 16.284459] _raw_spin_lock (./include/linux/spinlock_api_smp.h:133 kernel/locking/spinlock.c:154)
[ 16.284460] virtnet_poll_tx (./include/linux/netdevice.h:4661 drivers/net/virtio_net.c:3255)
[ 16.284462] __napi_poll (./arch/x86/include/asm/jump_label.h:36 ./include/trace/events/napi.h:14 net/core/dev.c:7495)
[ 16.284463] net_rx_action (net/core/dev.c:7559 net/core/dev.c:7684)
[ 16.284463] handle_softirqs (./arch/x86/include/asm/jump_label.h:36 ./include/trace/events/irq.h:142 kernel/softirq.c:580)
[ 16.284464] do_softirq (kernel/softirq.c:480)
[ 16.284465] __local_bh_enable_ip (kernel/softirq.c:?)
[ 16.284466] virtnet_napi_tx_enable (drivers/net/virtio_net.c:2895)
[ 16.284467] virtnet_open (drivers/net/virtio_net.c:3205)
[ 16.284468] __dev_open (net/core/dev.c:1682)
[ 16.284469] netif_open (net/core/dev.c:1706)
[ 16.284470] dev_open (net/core/dev_api.c:?)
[ 16.284470] netpoll_setup (net/core/netpoll.c:744)
[ 16.284471] init_netconsole (drivers/net/netconsole.c:1876 drivers/net/netconsole.c:1927)
[ 16.284472] do_one_initcall (init/main.c:1269)
[ 16.284473] do_initcall_level (init/main.c:1330)
[ 16.284475] do_initcalls (init/main.c:1344)
[ 16.284476] kernel_init_freeable (init/main.c:1583)
[ 16.284478] kernel_init (init/main.c:1471)
[ 16.284479] ret_from_fork (arch/x86/kernel/process.c:154)
[ 16.284480] ret_from_fork_asm (arch/x86/entry/entry_64.S:258)
[ 16.284481] INITIAL USE at:
[ 16.284482] lock_acquire (kernel/locking/lockdep.c:5868)
[ 16.284482] _raw_spin_trylock (./include/linux/spinlock_api_smp.h:90 kernel/locking/spinlock.c:138)
[ 16.284484] virtnet_poll (./include/linux/spinlock.h:? ./include/linux/netdevice.h:4684 drivers/net/virtio_net.c:3056 drivers/net/virtio_net.c:3108)
[ 16.284485] __napi_poll (./arch/x86/include/asm/jump_label.h:36 ./include/trace/events/napi.h:14 net/core/dev.c:7495)
[ 16.284485] net_rx_action (net/core/dev.c:7559 net/core/dev.c:7684)
[ 16.284486] handle_softirqs (./arch/x86/include/asm/jump_label.h:36 ./include/trace/events/irq.h:142 kernel/softirq.c:580)
[ 16.284487] do_softirq (kernel/softirq.c:480)
[ 16.284488] __local_bh_enable_ip (kernel/softirq.c:?)
[ 16.284489] virtnet_napi_enable (drivers/net/virtio_net.c:2874)
[ 16.284490] virtnet_open (drivers/net/virtio_net.c:? drivers/net/virtio_net.c:3211)
[ 16.284490] __dev_open (net/core/dev.c:1682)
[ 16.284491] netif_open (net/core/dev.c:1706)
[ 16.284492] dev_open (net/core/dev_api.c:?)
[ 16.284492] netpoll_setup (net/core/netpoll.c:744)
[ 16.284493] init_netconsole (drivers/net/netconsole.c:1876 drivers/net/netconsole.c:1927)
[ 16.284494] do_one_initcall (init/main.c:1269)
[ 16.284495] do_initcall_level (init/main.c:1330)
[ 16.284496] do_initcalls (init/main.c:1344)
[ 16.284498] kernel_init_freeable (init/main.c:1583)
[ 16.284499] kernel_init (init/main.c:1471)
[ 16.284501] ret_from_fork (arch/x86/kernel/process.c:154)
[ 16.284502] ret_from_fork_asm (arch/x86/entry/entry_64.S:258)
[ 16.284503] }
[ 16.284503] ... key at: netdev_xmit_lock_key+0x10/0x390
[ 16.284506] ... acquired at:
[ 16.284507] _raw_spin_lock (./include/linux/spinlock_api_smp.h:133 kernel/locking/spinlock.c:154)
[ 16.284508] virtnet_poll_tx (./include/linux/netdevice.h:4661 drivers/net/virtio_net.c:3255)
[ 16.284509] netpoll_poll_dev (net/core/netpoll.c:157 net/core/netpoll.c:170 net/core/netpoll.c:200)
[ 16.284510] netpoll_send_skb (./include/asm-generic/delay.h:62 net/core/netpoll.c:356 net/core/netpoll.c:410)
[ 16.284511] netpoll_send_udp (net/core/netpoll.c:532)
[ 16.284511] write_ext_msg (drivers/net/netconsole.c:1498 drivers/net/netconsole.c:1536 drivers/net/netconsole.c:1692 drivers/net/netconsole.c:1710)
[ 16.284513] console_flush_all (kernel/printk/printk.c:3055 kernel/printk/printk.c:3139 kernel/printk/printk.c:3226)
[ 16.284515] console_unlock (kernel/printk/printk.c:3285 kernel/printk/printk.c:3325)
[ 16.284516] vprintk_emit (kernel/printk/printk.c:?)
[ 16.284518] _printk (kernel/printk/printk.c:2478)
[ 16.284519] register_console (kernel/printk/printk.c:4127)
[ 16.284521] init_netconsole (drivers/net/netconsole.c:1960)
[ 16.284522] do_one_initcall (init/main.c:1269)
[ 16.284523] do_initcall_level (init/main.c:1330)
[ 16.284524] do_initcalls (init/main.c:1344)
[ 16.284526] kernel_init_freeable (init/main.c:1583)
[ 16.284527] kernel_init (init/main.c:1471)
[ 16.284529] ret_from_fork (arch/x86/kernel/process.c:154)
[ 16.284530] ret_from_fork_asm (arch/x86/entry/entry_64.S:258)
[ 16.284530]
[ 16.284531] -> (target_list_lock){....}-{3:3} ops: 420 {
[ 16.284533] INITIAL USE at:
[ 16.284534] lock_acquire (kernel/locking/lockdep.c:5868)
[ 16.284592] _raw_spin_lock_irqsave (./include/linux/spinlock_api_smp.h:110 kernel/locking/spinlock.c:162)
[ 16.284593] init_netconsole (./include/linux/list.h:169 drivers/net/netconsole.c:1944)
[ 16.284595] do_one_initcall (init/main.c:1269)
[ 16.284596] do_initcall_level (init/main.c:1330)
[ 16.284597] do_initcalls (init/main.c:1344)
[ 16.284599] kernel_init_freeable (init/main.c:1583)
[ 16.284600] kernel_init (init/main.c:1471)
[ 16.284602] ret_from_fork (arch/x86/kernel/process.c:154)
[ 16.284603] ret_from_fork_asm (arch/x86/entry/entry_64.S:258)
[ 16.284604] }
[ 16.284604] ... key at: target_list_lock (??:?)
[ 16.284606] ... acquired at:
[ 16.284606] _raw_spin_lock_irqsave (./include/linux/spinlock_api_smp.h:110 kernel/locking/spinlock.c:162)
[ 16.284607] write_ext_msg (drivers/net/netconsole.c:?)
[ 16.284609] console_flush_all (kernel/printk/printk.c:3055 kernel/printk/printk.c:3139 kernel/printk/printk.c:3226)
[ 16.284610] console_unlock (kernel/printk/printk.c:3285 kernel/printk/printk.c:3325)
[ 16.284612] vprintk_emit (kernel/printk/printk.c:?)
[ 16.284613] _printk (kernel/printk/printk.c:2478)
[ 16.284614] register_console (kernel/printk/printk.c:4127)
[ 16.284616] init_netconsole (drivers/net/netconsole.c:1960)
[ 16.284617] do_one_initcall (init/main.c:1269)
[ 16.284618] do_initcall_level (init/main.c:1330)
[ 16.284619] do_initcalls (init/main.c:1344)
[ 16.284620] kernel_init_freeable (init/main.c:1583)
[ 16.284622] kernel_init (init/main.c:1471)
[ 16.284623] ret_from_fork (arch/x86/kernel/process.c:154)
[ 16.284624] ret_from_fork_asm (arch/x86/entry/entry_64.S:258)
[ 16.284625]
[ 16.284625] -> (console_owner){-...}-{0:0} ops: 2643 {
[ 16.284627] IN-HARDIRQ-W at:
[ 16.284628] lock_acquire (kernel/locking/lockdep.c:5868)
[ 16.284629] console_flush_all (kernel/printk/printk.c:1924 kernel/printk/printk.c:3132 kernel/printk/printk.c:3226)
[ 16.284630] console_unlock (kernel/printk/printk.c:3285 kernel/printk/printk.c:3325)
[ 16.284631] wake_up_klogd_work_func (kernel/printk/printk.c:4529)
[ 16.284632] irq_work_run_list (kernel/irq_work.c:222 kernel/irq_work.c:252)
[ 16.284634] update_process_times (kernel/time/timer.c:2478)
[ 16.284636] tick_nohz_handler (kernel/time/tick-sched.c:187 kernel/time/tick-sched.c:306)
[ 16.284638] __hrtimer_run_queues (kernel/time/hrtimer.c:1761 kernel/time/hrtimer.c:1825)
[ 16.284639] hrtimer_interrupt (kernel/time/hrtimer.c:1890)
[ 16.284640] __sysvec_apic_timer_interrupt (./arch/x86/include/asm/jump_label.h:36 ./arch/x86/include/asm/trace/irq_vectors.h:40 arch/x86/kernel/apic/apic.c:1057)
[ 16.284642] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050)
[ 16.284643] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702)
[ 16.284644] pv_native_safe_halt (arch/x86/kernel/paravirt.c:82)
[ 16.284645] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:757)
[ 16.284647] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:123)
[ 16.284648] do_idle (kernel/sched/idle.c:191 kernel/sched/idle.c:330)
[ 16.284649] cpu_startup_entry (kernel/sched/idle.c:427)
[ 16.284650] start_secondary (arch/x86/kernel/smpboot.c:315)
[ 16.284651] common_startup_64 (arch/x86/kernel/head_64.S:419)
[ 16.284653] INITIAL USE at:
[ 16.284654] }
[ 16.284654] ... key at: console_owner_dep_map (??:?)
[ 16.284842] ... acquired at:
[ 16.284843] mark_lock (kernel/locking/lockdep.c:4753)
[ 16.284844] __lock_acquire (kernel/locking/lockdep.c:? kernel/locking/lockdep.c:5191)
[ 16.284845] lock_acquire (kernel/locking/lockdep.c:5868)
[ 16.284846] console_flush_all (kernel/printk/printk.c:1924 kernel/printk/printk.c:3132 kernel/printk/printk.c:3226)
[ 16.284847] console_unlock (kernel/printk/printk.c:3285 kernel/printk/printk.c:3325)
[ 16.284849] wake_up_klogd_work_func (kernel/printk/printk.c:4529)
[ 16.284849] irq_work_run_list (kernel/irq_work.c:222 kernel/irq_work.c:252)
[ 16.284850] update_process_times (kernel/time/timer.c:2478)
[ 16.284852] tick_nohz_handler (kernel/time/tick-sched.c:187 kernel/time/tick-sched.c:306)
[ 16.284854] __hrtimer_run_queues (kernel/time/hrtimer.c:1761 kernel/time/hrtimer.c:1825)
[ 16.284854] hrtimer_interrupt (kernel/time/hrtimer.c:1890)
[ 16.284855] __sysvec_apic_timer_interrupt (./arch/x86/include/asm/jump_label.h:36 ./arch/x86/include/asm/trace/irq_vectors.h:40 arch/x86/kernel/apic/apic.c:1057)
[ 16.284856] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050)
[ 16.284858] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702)
[ 16.284858] pv_native_safe_halt (arch/x86/kernel/paravirt.c:82)
[ 16.284859] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:757)
[ 16.284861] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:123)
[ 16.284862] do_idle (kernel/sched/idle.c:191 kernel/sched/idle.c:330)
[ 16.284863] cpu_startup_entry (kernel/sched/idle.c:427)
[ 16.284863] start_secondary (arch/x86/kernel/smpboot.c:315)
[ 16.284864] common_startup_64 (arch/x86/kernel/head_64.S:419)
[ 16.284866]
[ 16.284866]
[ 16.284866] stack backtrace:
[ 16.284870] Tainted: [E]=UNSIGNED_MODULE
[ 16.284871] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 16.284872] Call Trace:
[ 16.284873] <IRQ>
[ 16.284876] dump_stack_lvl (lib/dump_stack.c:123)
[ 16.284880] print_irq_inversion_bug (kernel/locking/lockdep.c:?)
[ 16.284882] mark_lock_irq (kernel/locking/lockdep.c:?)
[ 16.284883] ? stack_trace_save (kernel/stacktrace.c:123)
[ 16.284886] mark_lock (kernel/locking/lockdep.c:4753)
[ 16.284887] __lock_acquire (kernel/locking/lockdep.c:? kernel/locking/lockdep.c:5191)
[ 16.284890] ? printk_get_next_message (kernel/printk/printk.c:3024)
[ 16.284892] ? console_flush_all (./include/linux/rcupdate.h:336 ./include/linux/srcu.h:319 kernel/printk/printk.c:288 kernel/printk/printk.c:3203)
[ 16.284894] lock_acquire (kernel/locking/lockdep.c:5868)
[ 16.284895] ? console_flush_all (./include/linux/rcupdate.h:336 ./include/linux/srcu.h:319 kernel/printk/printk.c:288 kernel/printk/printk.c:3203)
[ 16.284897] ? console_flush_all (kernel/printk/printk.c:1924 kernel/printk/printk.c:3132 kernel/printk/printk.c:3226)
[ 16.284899] ? console_flush_all (./include/linux/rcupdate.h:336 ./include/linux/srcu.h:319 kernel/printk/printk.c:288 kernel/printk/printk.c:3203)
[ 16.284900] console_flush_all (kernel/printk/printk.c:1924 kernel/printk/printk.c:3132 kernel/printk/printk.c:3226)
[ 16.284923] ? console_flush_all (./include/linux/rcupdate.h:336 ./include/linux/srcu.h:319 kernel/printk/printk.c:288 kernel/printk/printk.c:3203)
[ 16.284925] ? console_flush_all (./include/linux/rcupdate.h:336 ./include/linux/srcu.h:319 kernel/printk/printk.c:288 kernel/printk/printk.c:3203)
[ 16.284928] console_unlock (kernel/printk/printk.c:3285 kernel/printk/printk.c:3325)
[ 16.284930] wake_up_klogd_work_func (kernel/printk/printk.c:4529)
[ 16.284931] irq_work_run_list (kernel/irq_work.c:222 kernel/irq_work.c:252)
[ 16.284933] update_process_times (kernel/time/timer.c:2478)
[ 16.284935] tick_nohz_handler (kernel/time/tick-sched.c:187 kernel/time/tick-sched.c:306)
[ 16.284936] ? tick_setup_sched_timer (kernel/time/tick-sched.c:285)
[ 16.284938] __hrtimer_run_queues (kernel/time/hrtimer.c:1761 kernel/time/hrtimer.c:1825)
[ 16.284940] hrtimer_interrupt (kernel/time/hrtimer.c:1890)
[ 16.284942] __sysvec_apic_timer_interrupt (./arch/x86/include/asm/jump_label.h:36 ./arch/x86/include/asm/trace/irq_vectors.h:40 arch/x86/kernel/apic/apic.c:1057)
[ 16.284943] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050)
[ 16.284945] </IRQ>
[ 16.284946] <TASK>
[ 16.284947] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702)
[ 16.284948] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82)
[ 16.284950] Code: bd 54 01 e8 2f 00 00 00 48 2b 05 a0 8b 57 00 c3 cc cc cc cc cc cc cc f3 0f 1e fa eb 07 0f 00 2d 0d f3 05 00 f3 0f 1e fa fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 66 0f 1f 00 50 8b 37 83 e6
All code
========
0: bd 54 01 e8 2f mov $0x2fe80154,%ebp
5: 00 00 add %al,(%rax)
7: 00 48 2b add %cl,0x2b(%rax)
a: 05 a0 8b 57 00 add $0x578ba0,%eax
f: c3 ret
10: cc int3
11: cc int3
12: cc int3
13: cc int3
14: cc int3
15: cc int3
16: cc int3
17: f3 0f 1e fa endbr64
1b: eb 07 jmp 0x24
1d: 0f 00 2d 0d f3 05 00 verw 0x5f30d(%rip) # 0x5f331
24: f3 0f 1e fa endbr64
28: fb sti
29: f4 hlt
2a:* c3 ret <-- trapping instruction
2b: cc int3
2c: cc int3
2d: cc int3
2e: cc int3
2f: cc int3
30: cc int3
31: cc int3
32: cc int3
33: cc int3
34: cc int3
35: cc int3
36: cc int3
37: 66 0f 1f 00 nopw (%rax)
3b: 50 push %rax
3c: 8b 37 mov (%rdi),%esi
3e: 83 .byte 0x83
3f: e6 .byte 0xe6
Code starting with the faulting instruction
===========================================
0: c3 ret
1: cc int3
2: cc int3
3: cc int3
4: cc int3
5: cc int3
6: cc int3
7: cc int3
8: cc int3
9: cc int3
a: cc int3
b: cc int3
c: cc int3
d: 66 0f 1f 00 nopw (%rax)
11: 50 push %rax
12: 8b 37 mov (%rdi),%esi
14: 83 .byte 0x83
15: e6 .byte 0xe6
[ 16.284952] RSP: 0018:ffa000000012bed8 EFLAGS: 00000282
[ 16.284953] RAX: af64f61648e76300 RBX: ffffffff813cd1f0 RCX: 4000000000000000
[ 16.284954] RDX: 0000000000000001 RSI: ffffffff81fd2a36 RDI: ffffffff813cd1f0
[ 16.284955] RBP: ffa000000012bef8 R08: 0000000000060000 R09: 0000000000000001
[ 16.284956] R10: 0000000000000001 R11: 00000000fffeff01 R12: 0000000000000000
[ 16.284956] R13: 0000000000000000 R14: 0000000000000010 R15: 0000000000000000
[ 16.284958] ? do_idle (kernel/sched/idle.c:191 kernel/sched/idle.c:330)
[ 16.284959] ? default_idle_call (./include/linux/cpuidle.h:132 kernel/sched/idle.c:121)
[ 16.284960] ? do_idle (kernel/sched/idle.c:191 kernel/sched/idle.c:330)
[ 16.284962] ? do_idle (kernel/sched/idle.c:191 kernel/sched/idle.c:330)
[ 16.284962] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:757)
[ 16.284964] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:123)
[ 16.284965] do_idle (kernel/sched/idle.c:191 kernel/sched/idle.c:330)
[ 16.284967] cpu_startup_entry (kernel/sched/idle.c:427)
[ 16.284968] start_secondary (arch/x86/kernel/smpboot.c:315)
[ 16.284969] common_startup_64 (arch/x86/kernel/head_64.S:419)
[ 16.284972] </TASK>
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