INFO: task kworker/1:3:1134 blocked for more than 143 seconds.
      Not tainted 5.16.0-rc4-next-20211207-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:3     state:D stack:25536 pid: 1134 ppid:     2 flags:0x00004000
Workqueue: events linkwatch_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4983 [inline]
 __schedule+0xab2/0x4d90 kernel/sched/core.c:6293
 schedule+0xd2/0x260 kernel/sched/core.c:6366
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425
 __mutex_lock_common kernel/locking/mutex.c:680 [inline]
 __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
 linkwatch_event+0xb/0x60 net/core/link_watch.c:251
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2318
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2465
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task kworker/1:2:15351 blocked for more than 143 seconds.
      Not tainted 5.16.0-rc4-next-20211207-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:2     state:D stack:28128 pid:15351 ppid:     2 flags:0x00004000
Workqueue: events switchdev_deferred_process_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4983 [inline]
 __schedule+0xab2/0x4d90 kernel/sched/core.c:6293
 schedule+0xd2/0x260 kernel/sched/core.c:6366
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425
 __mutex_lock_common kernel/locking/mutex.c:680 [inline]
 __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
 switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2318
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2465
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task syz-executor.2:15884 blocked for more than 144 seconds.
      Not tainted 5.16.0-rc4-next-20211207-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:24472 pid:15884 ppid:     1 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4983 [inline]
 __schedule+0xab2/0x4d90 kernel/sched/core.c:6293
 schedule+0xd2/0x260 kernel/sched/core.c:6366
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425
 __mutex_lock_common kernel/locking/mutex.c:680 [inline]
 __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0x3be/0xb80 net/core/rtnetlink.c:5567
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2492
 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1341
 netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 __sys_sendto+0x21c/0x320 net/socket.c:2036
 __do_sys_sendto net/socket.c:2048 [inline]
 __se_sys_sendto net/socket.c:2044 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2044
 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: 0033:0x7f4cf079d8bc
RSP: 002b:00007fff9c871d80 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f4cf1836320 RCX: 00007f4cf079d8bc
RDX: 0000000000000038 RSI: 00007f4cf1836370 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007fff9c871dd4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f4cf1836370 R14: 0000000000000003 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8bb828a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
1 lock held by khugepaged/33:
 #0: ffffffff8bc696a8 (lock#5){+.+.}-{3:3}, at: __lru_add_drain_all+0x65/0x760 mm/swap.c:798
1 lock held by in:imklog/6220:
 #0: ffff88801aae65f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:994
2 locks held by kworker/1:7/8514:
 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline]
 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline]
 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2289
 #1: ffffc9000faf7db0 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2293
3 locks held by kworker/0:5/8517:
 #0: ffff888022cb6938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888022cb6938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888022cb6938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
 #0: ffff888022cb6938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline]
 #0: ffff888022cb6938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline]
 #0: ffff888022cb6938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2289
 #1: ffffc9000fb67db0 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2293
 #2: ffffffff8d319fe8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4595
3 locks held by kworker/1:3/1134:
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2289
 #1: ffffc900033cfdb0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2293
 #2: ffffffff8d319fe8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xb/0x60 net/core/link_watch.c:251
3 locks held by kworker/u4:10/7129:
3 locks held by kworker/1:2/15351:
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2289
 #1: ffffc90004897db0 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2293
 #2: ffffffff8d319fe8 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74
1 lock held by syz-executor.1/15818:
 #0: ffffffff8d319fe8 (rtnl_mutex){+.+.}-{3:3}, at: netdev_run_todo+0x6fa/0xa80 net/core/dev.c:9954
5 locks held by syz-executor.5/15843:
2 locks held by syz-executor.0/15851:
 #0: ffffffff8d319fe8 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:684 [inline]
 #0: ffffffff8d319fe8 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3402
 #1: ffffffff8bb8c4a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
 #1: ffffffff8bb8c4a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4fa/0x620 kernel/rcu/tree_exp.h:840
1 lock held by syz-executor.2/15884:
 #0: ffffffff8d319fe8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d319fe8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3be/0xb80 net/core/rtnetlink.c:5567

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc4-next-20211207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:256 [inline]
 watchdog+0xcb7/0xed0 kernel/hung_task.c:413
 kthread+0x405/0x4f0 kernel/kthread.c:345
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 15843 Comm: syz-executor.5 Not tainted 5.16.0-rc4-next-20211207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1177 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0x83/0x150 kernel/rcu/tree.c:1167
Code: 3c 02 00 0f 85 ad 00 00 00 48 03 1c ed a0 38 57 8b 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 18 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 90 00 00 00 48 8d 7b 20 48 8b 6b 18 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc90000007a58 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff8880b9c3ab80 RCX: ffffffff8131cac9
RDX: 1ffff11017387573 RSI: 0000000000010104 RDI: ffff8880b9c3ab98
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8d923217
R10: fffffbfff1b24642 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b663cbba98 CR3: 000000000b88e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
 rcu_read_lock_held_common kernel/rcu/update.c:102 [inline]
 rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:123
 trace_local_timer_entry arch/x86/include/asm/trace/irq_vectors.h:41 [inline]
 __sysvec_apic_timer_interrupt+0x383/0x530 arch/x86/kernel/apic/apic.c:1102
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:slab_pre_alloc_hook mm/slab.h:737 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:3145 [inline]
RIP: 0010:kmem_cache_alloc_node+0x36/0x3e0 mm/slub.c:3267
Code: 41 54 55 48 89 fd 53 48 83 ec 18 44 8b 25 a6 20 d0 0b 65 48 8b 04 25 28 00 00 00 48 89 44 24 10 31 c0 48 8b 44 24 48 8b 5f 1c <41> 21 f4 44 89 e7 48 89 04 24 e8 cb d8 f4 ff 44 89 e7 e8 d3 d7 f4
RSP: 0018:ffffc90000007b60 EFLAGS: 00000246
RAX: ffffffff8730f625 RBX: 00000000000000e8 RCX: 0000000000000100
RDX: 00000000ffffffff RSI: 0000000000020820 RDI: ffff8880155bd640
RBP: ffff8880155bd640 R08: 0000000000000004 R09: 0000000000000000
R10: ffffffff8730f47b R11: 0000000000000000 R12: 0000000003ffffff
R13: 0000000000020820 R14: 00000000ffffffff R15: 0000000000000002
 __alloc_skb+0x215/0x340 net/core/skbuff.c:414
 __netdev_alloc_skb+0x73/0x400 net/core/skbuff.c:494
 netdev_alloc_skb include/linux/skbuff.h:2915 [inline]
 dev_alloc_skb include/linux/skbuff.h:2928 [inline]
 __ieee80211_beacon_get+0x9f7/0x15e0 net/mac80211/tx.c:5147
 ieee80211_beacon_get_tim+0x88/0x930 net/mac80211/tx.c:5226
 ieee80211_beacon_get include/net/mac80211.h:5004 [inline]
 mac80211_hwsim_beacon_tx+0x111/0x930 drivers/net/wireless/mac80211_hwsim.c:1808
 __iterate_interfaces+0x1e5/0x560 net/mac80211/util.c:793
 ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829
 mac80211_hwsim_beacon+0xcd/0x1c0 drivers/net/wireless/mac80211_hwsim.c:1861
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:core_kernel_text+0x7a/0x90 kernel/extable.c:74
Code: 2f 83 3d ac a4 44 0c 01 76 07 44 89 e0 5b 41 5c c3 48 81 fb 00 60 d1 8e 72 f0 48 81 fb 96 98 e5 8e 73 e7 41 bc 01 00 00 00 5b <44> 89 e0 41 5c c3 48 c7 c7 84 06 92 8d e8 04 18 75 00 eb c3 66 90
RSP: 0018:ffffc9000c1073e8 EFLAGS: 00000293
RAX: dffffc0000000000 RBX: ffffffff81b7a529 RCX: 0000000000000000
RDX: 1ffff92001820e90 RSI: ffffc9000c1076d8 RDI: ffffffff81b7a529
RBP: ffffffff81b7a529 R08: ffffffff8e1854e8 R09: 0000000000000001
R10: fffff52001820e92 R11: 000000000008808a R12: 0000000000000001
R13: 0000000000000000 R14: ffff88801c3bba80 R15: 000001bed8353aa0
 kernel_text_address+0xd/0x80 kernel/extable.c:98
 __kernel_text_address+0x9/0x30 kernel/extable.c:78
 unwind_get_return_address arch/x86/kernel/unwind_orc.c:318 [inline]
 unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:313
 arch_stack_walk+0x93/0xe0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
 save_stack+0x151/0x1e0 mm/page_owner.c:121
 __reset_page_owner+0x5d/0x180 mm/page_owner.c:142
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1351 [inline]
 free_pcp_prepare+0x414/0xb60 mm/page_alloc.c:1403
 free_unref_page_prepare mm/page_alloc.c:3324 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3403
 kasan_depopulate_vmalloc_pte+0x5c/0x70 mm/kasan/shadow.c:380
 apply_to_pte_range mm/memory.c:2518 [inline]
 apply_to_pmd_range mm/memory.c:2562 [inline]
 apply_to_pud_range mm/memory.c:2598 [inline]
 apply_to_p4d_range mm/memory.c:2634 [inline]
 __apply_to_page_range+0x694/0x1080 mm/memory.c:2668
 kasan_release_vmalloc+0xa7/0xc0 mm/kasan/shadow.c:490
 __purge_vmap_area_lazy+0x8f9/0x1c50 mm/vmalloc.c:1708
 try_purge_vmap_area_lazy mm/vmalloc.c:1727 [inline]
 free_vmap_area_noflush+0xa5b/0xd10 mm/vmalloc.c:1769
 free_unmap_vmap_area mm/vmalloc.c:1782 [inline]
 remove_vm_area+0x1ca/0x230 mm/vmalloc.c:2528
 vm_remove_mappings mm/vmalloc.c:2557 [inline]
 __vunmap+0x392/0xb70 mm/vmalloc.c:2622
 __vfree+0x3c/0xd0 mm/vmalloc.c:2680
 vfree+0x5a/0x90 mm/vmalloc.c:2711
 kcov_put kernel/kcov.c:411 [inline]
 kcov_put+0x26/0x40 kernel/kcov.c:407
 kcov_close+0xc/0x10 kernel/kcov.c:513
 __fput+0x286/0x9f0 fs/file_table.c:311
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xc14/0x2c20 kernel/exit.c:832
 do_group_exit+0x125/0x310 kernel/exit.c:929
 get_signal+0x34c/0x28b0 kernel/signal.c:2859
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f2aaf781af9
Code: Unable to access opcode bytes at RIP 0x7f2aaf781acf.
RSP: 002b:00007f2aae6f7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: 0000000000000070 RBX: 00007f2aaf894f60 RCX: 00007f2aaf781af9
RDX: 0400000000000070 RSI: 0000000020007fc0 RDI: 0000000000000003
RBP: 00007f2aaf7dbff7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe15fcfe4f R14: 00007f2aae6f7300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	3c 02                	cmp    $0x2,%al
   2:	00 0f                	add    %cl,(%rdi)
   4:	85 ad 00 00 00 48    	test   %ebp,0x48000000(%rbp)
   a:	03 1c ed a0 38 57 8b 	add    -0x74a8c760(,%rbp,8),%ebx
  11:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  18:	fc ff df
  1b:	48 8d 7b 18          	lea    0x18(%rbx),%rdi
  1f:	48 89 fa             	mov    %rdi,%rdx
  22:	48 c1 ea 03          	shr    $0x3,%rdx
  26:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
* 2a:	0f 85 90 00 00 00    	jne    0xc0 <-- trapping instruction
  30:	48 8d 7b 20          	lea    0x20(%rbx),%rdi
  34:	48 8b 6b 18          	mov    0x18(%rbx),%rbp
  38:	48                   	rex.W
  39:	b8 00 00 00 00       	mov    $0x0,%eax
  3e:	00 fc                	add    %bh,%ah