rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
(detected by 0, t=10502 jiffies, g=431249, q=91)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295201148-4295190646), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g431249 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:28880 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4681 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5938
schedule+0xd3/0x270 kernel/sched/core.c:6017
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop kernel/rcu/tree.c:1996 [inline]
rcu_gp_kthread+0xd34/0x1980 kernel/rcu/tree.c:2169
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 26835 Comm: syz-executor.2 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_check_gp_kthread_starvation.cold+0x1d1/0x1d6 kernel/rcu/tree_stall.h:479
print_other_cpu_stall kernel/rcu/tree_stall.h:584 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:709 [inline]
rcu_pending kernel/rcu/tree.c:3922 [inline]
rcu_sched_clock_irq+0x2001/0x20c0 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 5d 6f 42 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: ffff8880aa3d32a0 RCX: 0000000000000100
RDX: 0000000000000004 RSI: ffffffff85333b83 RDI: ffff8880aa3d6f4c
RBP: dffffc0000000000 R08: 0000000000000006 R09: 0000000000000000
R10: ffffffff85333bb9 R11: 0000000000000000 R12: ffff8880ac3f8640
R13: ffff88806acbb4d0 R14: ffff88806acbb2a0 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_schedule_irq+0x49/0x90 kernel/sched/core.c:6326
Code: 55 53 65 48 8b 1c 25 40 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 e2 26 1e f8 e8 fd 72 4a f8 fb bf 01 00 00 00 d2 cd ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 f0 15 1e
RSP: 0018:ffffc9000174f4b8 EFLAGS: 00000206
RAX: 000000000000590f RBX: ffff88808c4f9c40 RCX: 1ffffffff1fa6552
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed101189f388 R08: 0000000000000001 R09: ffffffff8fcfa977
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
irqentry_exit+0x31/0x80 kernel/entry/common.c:427
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0x70 kernel/kcov.c:285
Code: 44 30 e0 03 00 00 00 48 89 7c 30 e8 48 89 4c 30 f0 4c 89 54 d8 20 48 89 10 5b c3 0f 1f 80 00 00 00 00 41 89 f8 bf 03 00 00 00 <4c> 8b 14 24 89 f1 65 48 8b 34 25 40 f0 01 00 e8 54 f0 ff ff 84 c0
RSP: 0018:ffffc9000174f580 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000003
RBP: ffff888147e76000 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff8208d067 R11: 0000000000000000 R12: ffff8880287da870
R13: 0000000000000000 R14: ffff888147e76678 R15: 0000000000000001
ext4_get_group_desc+0x19c/0x500 fs/ext4/balloc.c:284
recently_deleted fs/ext4/ialloc.c:683 [inline]
find_inode_bit+0x1c4/0x580 fs/ext4/ialloc.c:729
__ext4_new_inode+0xc4d/0x5c40 fs/ext4/ialloc.c:1064
ext4_create+0x2d6/0x4d0 fs/ext4/namei.c:2738
lookup_open.isra.0+0xfe4/0x13d0 fs/namei.c:3228
open_last_lookups fs/namei.c:3298 [inline]
path_openat+0x9b3/0x27f0 fs/namei.c:3504
do_filp_open+0x1aa/0x400 fs/namei.c:3534
do_sys_openat2+0x16d/0x420 fs/open.c:1204
do_sys_open fs/open.c:1220 [inline]
__do_sys_openat fs/open.c:1236 [inline]
__se_sys_openat fs/open.c:1231 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1231
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:00007facd9c6f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 00000000000026e1 RSI: 00000000200002c0 RDI: ffffffffffffff9c
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffc3deab1ff R14: 00007facd9c6f300 R15: 0000000000022000
================================
WARNING: inconsistent lock state
5.14.0-rc7-syzkaller #0 Not tainted
--------------------------------
inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
syz-executor.2/26835 [HC0[0]:SC1[1]:HE0:SE0] takes:
ffffffff8b9850d8 (rcu_node_0){?.-.}-{2:2}, at: print_other_cpu_stall kernel/rcu/tree_stall.h:543 [inline]
ffffffff8b9850d8 (rcu_node_0){?.-.}-{2:2}, at: check_cpu_stall kernel/rcu/tree_stall.h:709 [inline]
ffffffff8b9850d8 (rcu_node_0){?.-.}-{2:2}, at: rcu_pending kernel/rcu/tree.c:3922 [inline]
ffffffff8b9850d8 (rcu_node_0){?.-.}-{2:2}, at: rcu_sched_clock_irq+0xc9a/0x20c0 kernel/rcu/tree.c:2641
{IN-HARDIRQ-W} state was registered at:
lock_acquire kernel/locking/lockdep.c:5625 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159
rcu_report_exp_cpu_mult+0x1c/0x280 kernel/rcu/tree_exp.h:237
flush_smp_call_function_queue+0x34b/0x640 kernel/smp.c:663
__sysvec_call_function_single+0x95/0x3d0 arch/x86/kernel/smp.c:248
sysvec_call_function_single+0x8e/0xc0 arch/x86/kernel/smp.c:243
asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:646
lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5593
__fs_reclaim_acquire mm/page_alloc.c:4554 [inline]
fs_reclaim_acquire+0x117/0x160 mm/page_alloc.c:4568
prepare_alloc_pages+0x15c/0x580 mm/page_alloc.c:5166
__alloc_pages+0x12f/0x500 mm/page_alloc.c:5379
alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244
alloc_slab_page mm/slub.c:1691 [inline]
allocate_slab+0x32e/0x4b0 mm/slub.c:1831
new_slab mm/slub.c:1894 [inline]
new_slab_objects mm/slub.c:2640 [inline]
___slab_alloc+0x473/0x7b0 mm/slub.c:2803
__slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2843
slab_alloc_node mm/slub.c:2925 [inline]
slab_alloc mm/slub.c:2967 [inline]
kmem_cache_alloc+0x3e1/0x4a0 mm/slub.c:2972
vm_area_alloc+0x1c/0x110 kernel/fork.c:349
__bprm_mm_init fs/exec.c:252 [inline]
bprm_mm_init fs/exec.c:376 [inline]
alloc_bprm+0x33e/0x8f0 fs/exec.c:1521
kernel_execve+0x55/0x460 fs/exec.c:1941
call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:112
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
irq event stamp: 9794723
hardirqs last enabled at (9794722): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
hardirqs last disabled at (9794723): [] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1100
softirqs last enabled at (2966828): [] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last enabled at (2966828): [] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
softirqs last disabled at (2966831): [] invoke_softirq kernel/softirq.c:432 [inline]
softirqs last disabled at (2966831): [] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(rcu_node_0);
lock(rcu_node_0);
*** DEADLOCK ***
6 locks held by syz-executor.2/26835:
#0: ffff888147e76460 (sb_writers#5){.+.+}-{0:0}, at: open_last_lookups fs/namei.c:3287 [inline]
#0: ffff888147e76460 (sb_writers#5){.+.+}-{0:0}, at: path_openat+0x25ed/0x27f0 fs/namei.c:3504
#1: ffff88808aaec058 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: inode_lock include/linux/fs.h:774 [inline]
#1: ffff88808aaec058 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: open_last_lookups fs/namei.c:3295 [inline]
#1: ffff88808aaec058 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: path_openat+0x94d/0x27f0 fs/namei.c:3504
#2: ffffffff8b97c280 (rcu_read_lock){....}-{1:2}, at: ext4_get_group_desc+0x110/0x500 fs/ext4/balloc.c:283
#3: ffffffff8b97c280 (rcu_read_lock){....}-{1:2}, at: ieee80211_iterate_active_interfaces_atomic+0x0/0x180 net/mac80211/util.c:1237
#4: ffffffff8c77d738 (hwsim_radio_lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
#4: ffffffff8c77d738 (hwsim_radio_lock){+.-.}-{2:2}, at: mac80211_hwsim_tx_frame_no_nl.isra.0+0x68f/0x1330 drivers/net/wireless/mac80211_hwsim.c:1516
#5: ffffffff8b9850d8 (rcu_node_0){?.-.}-{2:2}, at: print_other_cpu_stall kernel/rcu/tree_stall.h:543 [inline]
#5: ffffffff8b9850d8 (rcu_node_0){?.-.}-{2:2}, at: check_cpu_stall kernel/rcu/tree_stall.h:709 [inline]
#5: ffffffff8b9850d8 (rcu_node_0){?.-.}-{2:2}, at: rcu_pending kernel/rcu/tree.c:3922 [inline]
#5: ffffffff8b9850d8 (rcu_node_0){?.-.}-{2:2}, at: rcu_sched_clock_irq+0xc9a/0x20c0 kernel/rcu/tree.c:2641
stack backtrace:
CPU: 0 PID: 26835 Comm: syz-executor.2 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
print_usage_bug kernel/locking/lockdep.c:203 [inline]
valid_state kernel/locking/lockdep.c:3933 [inline]
mark_lock_irq kernel/locking/lockdep.c:4136 [inline]
mark_lock.cold+0x61/0x8e kernel/locking/lockdep.c:4593
mark_held_locks+0x9f/0xe0 kernel/locking/lockdep.c:4194
__trace_hardirqs_on_caller kernel/locking/lockdep.c:4212 [inline]
lockdep_hardirqs_on_prepare kernel/locking/lockdep.c:4280 [inline]
lockdep_hardirqs_on_prepare+0x135/0x400 kernel/locking/lockdep.c:4232
trace_hardirqs_on+0x5b/0x1c0 kernel/trace/trace_preemptirq.c:49
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 5d 6f 42 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: ffff8880aa3d32a0 RCX: 0000000000000100
RDX: 0000000000000004 RSI: ffffffff85333b83 RDI: ffff8880aa3d6f4c
RBP: dffffc0000000000 R08: 0000000000000006 R09: 0000000000000000
R10: ffffffff85333bb9 R11: 0000000000000000 R12: ffff8880ac3f8640
R13: ffff88806acbb4d0 R14: ffff88806acbb2a0 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_schedule_irq+0x49/0x90 kernel/sched/core.c:6326
Code: 55 53 65 48 8b 1c 25 40 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 e2 26 1e f8 e8 fd 72 4a f8 fb bf 01 00 00 00 d2 cd ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 f0 15 1e
RSP: 0018:ffffc9000174f4b8 EFLAGS: 00000206
RAX: 000000000000590f RBX: ffff88808c4f9c40 RCX: 1ffffffff1fa6552
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed101189f388 R08: 0000000000000001 R09: ffffffff8fcfa977
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
irqentry_exit+0x31/0x80 kernel/entry/common.c:427
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0x70 kernel/kcov.c:285
Code: 44 30 e0 03 00 00 00 48 89 7c 30 e8 48 89 4c 30 f0 4c 89 54 d8 20 48 89 10 5b c3 0f 1f 80 00 00 00 00 41 89 f8 bf 03 00 00 00 <4c> 8b 14 24 89 f1 65 48 8b 34 25 40 f0 01 00 e8 54 f0 ff ff 84 c0
RSP: 0018:ffffc9000174f580 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000003
RBP: ffff888147e76000 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff8208d067 R11: 0000000000000000 R12: ffff8880287da870
R13: 0000000000000000 R14: ffff888147e76678 R15: 0000000000000001
ext4_get_group_desc+0x19c/0x500 fs/ext4/balloc.c:284
recently_deleted fs/ext4/ialloc.c:683 [inline]
find_inode_bit+0x1c4/0x580 fs/ext4/ialloc.c:729
__ext4_new_inode+0xc4d/0x5c40 fs/ext4/ialloc.c:1064
ext4_create+0x2d6/0x4d0 fs/ext4/namei.c:2738
lookup_open.isra.0+0xfe4/0x13d0 fs/namei.c:3228
open_last_lookups fs/namei.c:3298 [inline]
path_openat+0x9b3/0x27f0 fs/namei.c:3504
do_filp_open+0x1aa/0x400 fs/namei.c:3534
do_sys_openat2+0x16d/0x420 fs/open.c:1204
do_sys_open fs/open.c:1220 [inline]
__do_sys_openat fs/open.c:1236 [inline]
__se_sys_openat fs/open.c:1231 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1231
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:00007facd9c6f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 00000000000026e1 RSI: 00000000200002c0 RDI: ffffffffffffff9c
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffc3deab1ff R14: 00007facd9c6f300 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 5d 6f 42 fc callq 0xfc426f6f
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