bisecting fixing commit since 6e764bcd1cf72a2846c0e53d3975a09b242c04c9 building syzkaller on b599f2fcc734e2183016a340d4f6fc2891d8e41f testing commit 6e764bcd1cf72a2846c0e53d3975a09b242c04c9 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: e120b21d61e2baf9572aeb0255a59ee637f930a2dae9794cc0fe975c5f2dcbca all runs: crashed: INFO: task hung in pn533_finalize_setup testing current HEAD 40037e4f8b2f7d33b8d266f139bf345962c48d46 testing commit 40037e4f8b2f7d33b8d266f139bf345962c48d46 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 0f723e5f9ad1f797ff6bb91483060f95110b1b6ffb8e6797761957fa8efe32f1 all runs: crashed: INFO: task hung in pn533_finalize_setup revisions tested: 2, total time: 23m59.783350755s (build: 12m12.316355937s, test: 10m58.480593019s) the crash still happens on HEAD commit msg: Merge tag 'sound-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound crash: INFO: task hung in pn533_finalize_setup INFO: task kworker/1:2:141 blocked for more than 143 seconds. Tainted: G W 5.17.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:2 state:D stack:26632 pid: 141 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5073 [inline] __schedule+0x913/0x26a0 kernel/sched/core.c:6382 schedule+0xd2/0x1f0 kernel/sched/core.c:6454 schedule_timeout+0x19d/0x250 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x373/0x530 kernel/sched/completion.c:106 pn533_send_cmd_sync drivers/nfc/pn533/pn533.c:631 [inline] pn533_get_firmware_version drivers/nfc/pn533/pn533.c:2519 [inline] pn533_finalize_setup+0xec/0x130 drivers/nfc/pn533/pn533.c:2716 pn533_usb_probe+0x846/0xf00 drivers/nfc/pn533/usb.c:544 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:755 driver_probe_device+0x44/0x110 drivers/base/dd.c:785 __device_attach_driver+0x185/0x250 drivers/base/dd.c:902 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:973 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_set_configuration+0xa66/0x18b0 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x95/0x240 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:755 driver_probe_device+0x44/0x110 drivers/base/dd.c:785 __device_attach_driver+0x185/0x250 drivers/base/dd.c:902 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:973 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_new_device.cold+0x5d1/0xeeb drivers/usb/core/hub.c:2566 hub_port_connect drivers/usb/core/hub.c:5358 [inline] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline] port_event drivers/usb/core/hub.c:5660 [inline] hub_event+0x114d/0x39b0 drivers/usb/core/hub.c:5742 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x299/0x340 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: task kworker/0:3:3653 blocked for more than 144 seconds. Tainted: G W 5.17.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:3 state:D stack:26880 pid: 3653 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5073 [inline] __schedule+0x913/0x26a0 kernel/sched/core.c:6382 schedule+0xd2/0x1f0 kernel/sched/core.c:6454 schedule_timeout+0x19d/0x250 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x373/0x530 kernel/sched/completion.c:106 pn533_send_cmd_sync drivers/nfc/pn533/pn533.c:631 [inline] pn533_get_firmware_version drivers/nfc/pn533/pn533.c:2519 [inline] pn533_finalize_setup+0xec/0x130 drivers/nfc/pn533/pn533.c:2716 pn533_usb_probe+0x846/0xf00 drivers/nfc/pn533/usb.c:544 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:755 driver_probe_device+0x44/0x110 drivers/base/dd.c:785 __device_attach_driver+0x185/0x250 drivers/base/dd.c:902 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:973 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_set_configuration+0xa66/0x18b0 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x95/0x240 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:755 driver_probe_device+0x44/0x110 drivers/base/dd.c:785 __device_attach_driver+0x185/0x250 drivers/base/dd.c:902 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:973 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_new_device.cold+0x5d1/0xeeb drivers/usb/core/hub.c:2566 hub_port_connect drivers/usb/core/hub.c:5358 [inline] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline] port_event drivers/usb/core/hub.c:5660 [inline] hub_event+0x114d/0x39b0 drivers/usb/core/hub.c:5742 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x299/0x340 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: task kworker/1:5:3654 blocked for more than 144 seconds. Tainted: G W 5.17.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:5 state:D stack:25352 pid: 3654 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5073 [inline] __schedule+0x913/0x26a0 kernel/sched/core.c:6382 schedule+0xd2/0x1f0 kernel/sched/core.c:6454 schedule_timeout+0x19d/0x250 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x373/0x530 kernel/sched/completion.c:106 pn533_send_cmd_sync drivers/nfc/pn533/pn533.c:631 [inline] pn533_get_firmware_version drivers/nfc/pn533/pn533.c:2519 [inline] pn533_finalize_setup+0xec/0x130 drivers/nfc/pn533/pn533.c:2716 pn533_usb_probe+0x846/0xf00 drivers/nfc/pn533/usb.c:544 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:755 driver_probe_device+0x44/0x110 drivers/base/dd.c:785 __device_attach_driver+0x185/0x250 drivers/base/dd.c:902 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:973 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_set_configuration+0xa66/0x18b0 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x95/0x240 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:755 driver_probe_device+0x44/0x110 drivers/base/dd.c:785 __device_attach_driver+0x185/0x250 drivers/base/dd.c:902 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:973 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_new_device.cold+0x5d1/0xeeb drivers/usb/core/hub.c:2566 hub_port_connect drivers/usb/core/hub.c:5358 [inline] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline] port_event drivers/usb/core/hub.c:5660 [inline] hub_event+0x114d/0x39b0 drivers/usb/core/hub.c:5742 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x299/0x340 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: task kworker/1:6:3655 blocked for more than 145 seconds. Tainted: G W 5.17.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:6 state:D stack:26016 pid: 3655 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5073 [inline] __schedule+0x913/0x26a0 kernel/sched/core.c:6382 schedule+0xd2/0x1f0 kernel/sched/core.c:6454 schedule_timeout+0x19d/0x250 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x373/0x530 kernel/sched/completion.c:106 pn533_send_cmd_sync drivers/nfc/pn533/pn533.c:631 [inline] pn533_get_firmware_version drivers/nfc/pn533/pn533.c:2519 [inline] pn533_finalize_setup+0xec/0x130 drivers/nfc/pn533/pn533.c:2716 pn533_usb_probe+0x846/0xf00 drivers/nfc/pn533/usb.c:544 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:755 driver_probe_device+0x44/0x110 drivers/base/dd.c:785 __device_attach_driver+0x185/0x250 drivers/base/dd.c:902 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:973 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_set_configuration+0xa66/0x18b0 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x95/0x240 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:755 driver_probe_device+0x44/0x110 drivers/base/dd.c:785 __device_attach_driver+0x185/0x250 drivers/base/dd.c:902 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:973 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_new_device.cold+0x5d1/0xeeb drivers/usb/core/hub.c:2566 hub_port_connect drivers/usb/core/hub.c:5358 [inline] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline] port_event drivers/usb/core/hub.c:5660 [inline] hub_event+0x114d/0x39b0 drivers/usb/core/hub.c:5742 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x299/0x340 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: task kworker/1:7:3974 blocked for more than 146 seconds. Tainted: G W 5.17.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:7 state:D stack:26904 pid: 3974 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5073 [inline] __schedule+0x913/0x26a0 kernel/sched/core.c:6382 schedule+0xd2/0x1f0 kernel/sched/core.c:6454 schedule_timeout+0x19d/0x250 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x373/0x530 kernel/sched/completion.c:106 pn533_send_cmd_sync drivers/nfc/pn533/pn533.c:631 [inline] pn533_get_firmware_version drivers/nfc/pn533/pn533.c:2519 [inline] pn533_finalize_setup+0xec/0x130 drivers/nfc/pn533/pn533.c:2716 pn533_usb_probe+0x846/0xf00 drivers/nfc/pn533/usb.c:544 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:755 driver_probe_device+0x44/0x110 drivers/base/dd.c:785 __device_attach_driver+0x185/0x250 drivers/base/dd.c:902 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:973 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_set_configuration+0xa66/0x18b0 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x95/0x240 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:755 driver_probe_device+0x44/0x110 drivers/base/dd.c:785 __device_attach_driver+0x185/0x250 drivers/base/dd.c:902 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:973 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_new_device.cold+0x5d1/0xeeb drivers/usb/core/hub.c:2566 hub_port_connect drivers/usb/core/hub.c:5358 [inline] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline] port_event drivers/usb/core/hub.c:5660 [inline] hub_event+0x114d/0x39b0 drivers/usb/core/hub.c:5742 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x299/0x340 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: task kworker/1:8:3975 blocked for more than 146 seconds. Tainted: G W 5.17.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:8 state:D stack:26904 pid: 3975 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5073 [inline] __schedule+0x913/0x26a0 kernel/sched/core.c:6382 schedule+0xd2/0x1f0 kernel/sched/core.c:6454 schedule_timeout+0x19d/0x250 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x373/0x530 kernel/sched/completion.c:106 pn533_send_cmd_sync drivers/nfc/pn533/pn533.c:631 [inline] pn533_get_firmware_version drivers/nfc/pn533/pn533.c:2519 [inline] pn533_finalize_setup+0xec/0x130 drivers/nfc/pn533/pn533.c:2716 pn533_usb_probe+0x846/0xf00 drivers/nfc/pn533/usb.c:544 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:755 driver_probe_device+0x44/0x110 drivers/base/dd.c:785 __device_attach_driver+0x185/0x250 drivers/base/dd.c:902 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:973 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_set_configuration+0xa66/0x18b0 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x95/0x240 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:755 driver_probe_device+0x44/0x110 drivers/base/dd.c:785 __device_attach_driver+0x185/0x250 drivers/base/dd.c:902 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:973 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_new_device.cold+0x5d1/0xeeb drivers/usb/core/hub.c:2566 hub_port_connect drivers/usb/core/hub.c:5358 [inline] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline] port_event drivers/usb/core/hub.c:5660 [inline] hub_event+0x114d/0x39b0 drivers/usb/core/hub.c:5742 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x299/0x340 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Tainted: G W 5.17.0-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+0x57/0x7d lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x30/0xc0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x140/0x170 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0x88c/0xbf0 kernel/hung_task.c:369 kthread+0x299/0x340 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 14 Comm: ksoftirqd/0 Tainted: G W 5.17.0-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:265 [inline] RIP: 0010:virt_to_folio include/linux/mm.h:860 [inline] RIP: 0010:virt_to_slab mm/slab.h:175 [inline] RIP: 0010:kmem_cache_free+0x8c/0x5a0 mm/slub.c:3527 Code: 00 48 89 df 4c 8b 64 24 78 e8 c0 d9 82 ff 48 c1 e8 0c 48 89 c5 48 b8 00 00 00 00 00 ea ff ff 48 c1 e5 06 48 01 c5 48 8b 45 08 01 0f 85 52 02 00 00 0f 1f 44 00 00 48 89 ef e8 ef 5a ff ff 4c RSP: 0018:ffffc90000d37cd0 EFLAGS: 00000286 RAX: ffffea000187dd01 RBX: ffff888061f779c0 RCX: 000000000000002e RDX: 0000000000000000 RSI: 1ffffffff194a276 RDI: ffff888061f779c0 RBP: ffffea000187ddc0 R08: 0000000000000001 R09: ffff888061f77be8 R10: ffffed100c3eef7f R11: 0000000000000000 R12: ffffffff815b04e1 R13: ffff88800fc4fc80 R14: 0000000000000015 R15: ffff888061f779d8 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020002800 CR3: 000000001b6c0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_do_batch kernel/rcu/tree.c:2535 [inline] rcu_core+0x7b1/0x1880 kernel/rcu/tree.c:2786 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 run_ksoftirqd kernel/softirq.c:921 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:913 smpboot_thread_fn+0x548/0x8c0 kernel/smpboot.c:164 kthread+0x299/0x340 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 00 48 89 add %cl,-0x77(%rax) 3: df 4c 8b 64 fisttps 0x64(%rbx,%rcx,4) 7: 24 78 and $0x78,%al 9: e8 c0 d9 82 ff callq 0xff82d9ce e: 48 c1 e8 0c shr $0xc,%rax 12: 48 89 c5 mov %rax,%rbp 15: 48 b8 00 00 00 00 00 movabs $0xffffea0000000000,%rax 1c: ea ff ff 1f: 48 c1 e5 06 shl $0x6,%rbp 23: 48 01 c5 add %rax,%rbp 26: 48 8b 45 08 mov 0x8(%rbp),%rax * 2a: a8 01 test $0x1,%al <-- trapping instruction 2c: 0f 85 52 02 00 00 jne 0x284 32: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 37: 48 89 ef mov %rbp,%rdi 3a: e8 ef 5a ff ff callq 0xffff5b2e 3f: 4c rex.WR