Oops: general protection fault, probably for non-canonical address 0xdffffc0060000000: 0000 [#1] SMP KASAN NOPTI
KASAN: probably user-memory-access in range [0x0000000300000000-0x0000000300000007]
CPU: 0 UID: 0 PID: 3953 Comm: syz-executor.4 Tainted: G W 6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary)
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:apply_wqattrs_cleanup.part.0+0xbd/0x2b0
Code: dd 28 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 95 01 00 00 48 8b 5c dd 28 48 85 db 74 41 e8 8a af 32 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 a6 01 00 00 48 8b 3b e8 50 a8 7c 03 48 89 df
RSP: 0018:ffff888044fc76b8 EFLAGS: 00010216
RAX: 0000000060000000 RBX: 0000000300000000 RCX: ffffc90003c17000
RDX: 0000000000040000 RSI: ffffffff814137f6 RDI: ffff88800d87d330
RBP: ffff88800d87d300 R08: 0000000000000001 R09: ffffed10089f8ec7
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: fffffbfff0b0a4ac R14: ffffffffffffffff R15: 0000000000000001
FS: 00007fd1a2734700(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeddbe4ff8 CR3: 0000000044e15000 CR4: 0000000000350ef0
Call Trace:
apply_workqueue_attrs_locked+0xa1/0xf0
__alloc_workqueue+0x1065/0x1820
alloc_workqueue_noprof+0xc7/0x200
loop_configure+0xf73/0x1590
lo_ioctl+0x66d/0x1c70
blkdev_ioctl+0x27c/0x6c0
__x64_sys_ioctl+0x18f/0x210
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd1a51be8d7
Code: 3c 1c 48 f7 d8 49 39 c4 72 b8 e8 a4 54 02 00 85 c0 78 bd 48 83 c4 08 4c 89 e0 5b 41 5c c3 0f 1f 44 00 00 b8 10 00 00 00 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:00007fd1a2733f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd1a5208970 RCX: 00007fd1a51be8d7
RDX: 0000000000000003 RSI: 0000000000004c00 RDI: 0000000000000004
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000003 R14: 00000000200002e0 R15: 0000000000000004
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:apply_wqattrs_cleanup.part.0+0xbd/0x2b0
Code: dd 28 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 95 01 00 00 48 8b 5c dd 28 48 85 db 74 41 e8 8a af 32 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 a6 01 00 00 48 8b 3b e8 50 a8 7c 03 48 89 df
RSP: 0018:ffff888044fc76b8 EFLAGS: 00010216
RAX: 0000000060000000 RBX: 0000000300000000 RCX: ffffc90003c17000
RDX: 0000000000040000 RSI: ffffffff814137f6 RDI: ffff88800d87d330
RBP: ffff88800d87d300 R08: 0000000000000001 R09: ffffed10089f8ec7
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: fffffbfff0b0a4ac R14: ffffffffffffffff R15: 0000000000000001
FS: 00007fd1a2734700(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeddbe4ff8 CR3: 0000000044e15000 CR4: 0000000000350ef0
loop2: detected capacity change from 0 to 1
kmemleak: Found object by alias at 0x607f1a6381bc
CPU: 1 UID: 0 PID: 3955 Comm: syz-executor.5 Tainted: G D W 6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary)
Tainted: [D]=DIE, [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xca/0x120
__lookup_object+0x94/0xb0
delete_object_full+0x27/0x70
free_percpu+0x30/0x1160
futex_hash_free+0x38/0xc0
mmput+0x2d3/0x390
do_exit+0x79d/0x2970
do_group_exit+0xd3/0x2a0
__x64_sys_exit_group+0x3e/0x50
x64_sys_call+0x18c5/0x18d0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbc0eb64b19
Code: Unable to access opcode bytes at 0x7fbc0eb64aef.
RSP: 002b:00007ffd8a8bb018 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007fbc0eb64b19
RDX: 00007fbc0eb1772b RSI: ffffffffffffffbc RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000001b2d125d90 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffd8a8bb100
kmemleak: Object (percpu) 0x607f1a6381b8 (size 8):
kmemleak: comm "syz-executor.4", pid 3953, jiffies 4294771774
kmemleak: min_count = 1
kmemleak: count = 0
kmemleak: flags = 0x21
kmemleak: checksum = 0
kmemleak: backtrace:
pcpu_alloc_noprof+0x87a/0x1170
__alloc_workqueue+0x74b/0x1820
alloc_workqueue_noprof+0xc7/0x200
loop_configure+0xf73/0x1590
lo_ioctl+0x66d/0x1c70
blkdev_ioctl+0x27c/0x6c0
__x64_sys_ioctl+0x18f/0x210
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
==================================================================
BUG: KASAN: slab-use-after-free in __mutex_lock+0xc72/0x1020
Read of size 4 at addr ffff88800a7f52b4 by task systemd-udevd/114
CPU: 0 UID: 0 PID: 114 Comm: systemd-udevd Tainted: G D W 6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary)
Tainted: [D]=DIE, [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xca/0x120
print_report+0xcb/0x610
kasan_report+0xca/0x100
__mutex_lock+0xc72/0x1020
lo_open+0x4e/0xe0
blkdev_get_whole+0x97/0x290
bdev_open+0x2c7/0xe40
blkdev_open+0x277/0x400
do_dentry_open+0x71c/0x1420
vfs_open+0x82/0x3f0
path_openat+0x1c3f/0x2880
do_filp_open+0x1e8/0x450
do_sys_openat2+0x104/0x1b0
__x64_sys_openat+0x142/0x200
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbb6ea17767
Code: 25 00 00 41 00 3d 00 00 41 00 74 47 64 8b 04 25 18 00 00 00 85 c0 75 6b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 95 00 00 00 48 8b 4c 24 28 64 48 2b 0c 25
RSP: 002b:00007ffe9aaf7a30 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffe9aaf7b40 RCX: 00007fbb6ea17767
RDX: 00000000000a0800 RSI: 000055e5093eb380 RDI: 00000000ffffff9c
RBP: 000055e5093eb380 R08: 000055e4c8e65540 R09: 00007fbb6e9fdbe0
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800
R13: 000055e4c8e6589f R14: 00007ffe9aaf7b00 R15: 000055e5093f6450
Allocated by task 3952:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_slab_alloc+0x59/0x70
kmem_cache_alloc_node_noprof+0x21a/0x690
copy_process+0x461/0x73c0
kernel_clone+0xea/0x7f0
__do_sys_clone+0xce/0x120
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 3966:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_save_free_info+0x3a/0x60
__kasan_slab_free+0x3f/0x50
kmem_cache_free+0x2a1/0x540
rcu_core+0x7c8/0x1800
handle_softirqs+0x1b1/0x770
__irq_exit_rcu+0xc4/0x100
irq_exit_rcu+0x9/0x20
sysvec_apic_timer_interrupt+0x70/0x80
asm_sysvec_apic_timer_interrupt+0x1a/0x20
Last potentially related work creation:
kasan_save_stack+0x24/0x50
kasan_record_aux_stack+0x89/0xa0
__call_rcu_common.constprop.0+0x70/0x960
delayed_put_task_struct+0xde/0x260
rcu_core+0x7c8/0x1800
handle_softirqs+0x1b1/0x770
run_ksoftirqd+0x2e/0x60
smpboot_thread_fn+0x41d/0x9d0
kthread+0x3c8/0x740
ret_from_fork+0x34b/0x430
ret_from_fork_asm+0x1a/0x30
Second to last potentially related work creation:
kasan_save_stack+0x24/0x50
kasan_record_aux_stack+0x89/0xa0
__call_rcu_common.constprop.0+0x70/0x960
put_task_struct_rcu_user+0x75/0xc0
__schedule+0xe86/0x3590
schedule+0xdb/0x390
worker_thread+0x156/0xe90
kthread+0x3c8/0x740
ret_from_fork+0x34b/0x430
ret_from_fork_asm+0x1a/0x30
The buggy address belongs to the object at ffff88800a7f5280
which belongs to the cache task_struct of size 6784
The buggy address is located 52 bytes inside of
freed 6784-byte region [ffff88800a7f5280, ffff88800a7f6d00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa7f0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800d302181
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888008ff7640 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000040004 00000000f5000000 ffff88800d302181
head: 0100000000000040 ffff888008ff7640 dead000000000100 dead000000000122
head: 0000000000000000 0000000000040004 00000000f5000000 ffff88800d302181
head: 0100000000000003 ffffea000029fc01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88800a7f5180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88800a7f5200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88800a7f5280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88800a7f5300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88800a7f5380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
loop2: detected capacity change from 0 to 1
BUG: unable to handle page fault for address: ffffed10212c935e
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 7ffd4067 P4D 7ffd4067 PUD 7ffd3067 PMD 0
Oops: Oops: 0000 [#2] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 3990 Comm: syz-executor.5 Tainted: G B D W 6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:perf_tp_event+0x175/0xe70
Code: ff df 48 89 85 a8 fd ff ff 48 c1 e8 03 4c 01 e0 48 89 85 c8 fd ff ff e8 c9 51 ea ff 48 8d bb f0 01 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 74 08 3c 03 0f 8e c5 0b 00 00 44 8b ab f0 01
RSP: 0018:ffff88801acdf800 EFLAGS: 00010212
RAX: 1ffff110212c935e RBX: ffff888109649900 RCX: ffffc90004a1e000
RDX: 0000000000040000 RSI: ffffffff818995b7 RDI: ffff888109649af0
RBP: ffff88801acdfa70 R08: ffff88806ce31340 R09: ffffe8ffffc151b8
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 000000000000002c R14: ffff88806ce31340 R15: dffffc0000000000
FS: 00007fbc0c0da700(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed10212c935e CR3: 00000000453ce000 CR4: 0000000000350ef0
Call Trace:
perf_trace_run_bpf_submit+0xef/0x180
perf_trace_lock+0x337/0x5d0
lock_release+0x1ab/0x290
futex_ref_get+0x119/0x300
futex_hash+0x70/0x390
futex_wake+0x143/0x540
do_futex+0x26d/0x370
__x64_sys_futex+0x1c9/0x4d0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbc0eb64b19
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:00007fbc0c0da218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fbc0ec77f68 RCX: 00007fbc0eb64b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fbc0ec77f6c
RBP: 00007fbc0ec77f60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00007fbc0ec77f6c
R13: 00007ffd8a8badef R14: 00007fbc0c0da300 R15: 0000000000022000
Modules linked in:
CR2: ffffed10212c935e
---[ end trace 0000000000000000 ]---
RIP: 0010:apply_wqattrs_cleanup.part.0+0xbd/0x2b0
Code: dd 28 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 95 01 00 00 48 8b 5c dd 28 48 85 db 74 41 e8 8a af 32 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 a6 01 00 00 48 8b 3b e8 50 a8 7c 03 48 89 df
RSP: 0018:ffff888044fc76b8 EFLAGS: 00010216
RAX: 0000000060000000 RBX: 0000000300000000 RCX: ffffc90003c17000
RDX: 0000000000040000 RSI: ffffffff814137f6 RDI: ffff88800d87d330
RBP: ffff88800d87d300 R08: 0000000000000001 R09: ffffed10089f8ec7
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: fffffbfff0b0a4ac R14: ffffffffffffffff R15: 0000000000000001
FS: 00007fbc0c0da700(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed10212c935e CR3: 00000000453ce000 CR4: 0000000000350ef0
note: syz-executor.5[3990] exited with irqs disabled
BUG: unable to handle page fault for address: ffffed10212c935e
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 7ffd4067 P4D 7ffd4067 PUD 7ffd3067 PMD 0
Oops: Oops: 0000 [#3] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 3990 Comm: syz-executor.5 Tainted: G B D W 6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE, [D]=DIE, [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:perf_tp_event+0x175/0xe70
Code: ff df 48 89 85 a8 fd ff ff 48 c1 e8 03 4c 01 e0 48 89 85 c8 fd ff ff e8 c9 51 ea ff 48 8d bb f0 01 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 74 08 3c 03 0f 8e c5 0b 00 00 44 8b ab f0 01
RSP: 0018:ffff88806ce08a80 EFLAGS: 00010012
RAX: 1ffff110212c935e RBX: ffff888109649900 RCX: 0000000000000002
RDX: ffff888043f65280 RSI: ffffffff818995b7 RDI: ffff888109649af0
RBP: ffff88806ce08cf0 R08: ffff88806ce31490 R09: ffffe8ffffc151b8
R10: 0000000000000000 R11: 746e756f63716573 R12: dffffc0000000000
R13: 000000000000002c R14: ffff88806ce31490 R15: dffffc0000000000
FS: 00007fbc0c0da700(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed10212c935e CR3: 00000000453ce000 CR4: 0000000000350ef0
Call Trace:
perf_trace_run_bpf_submit+0xef/0x180
perf_trace_lock+0x337/0x5d0
lock_release+0x1ab/0x290
ktime_get_update_offsets_now+0xab/0x3c0
hrtimer_interrupt+0x114/0x830
__sysvec_apic_timer_interrupt+0xbb/0x330
sysvec_apic_timer_interrupt+0x6b/0x80
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:make_task_dead+0xa2/0x3b0
Code: 38 00 85 db 0f 84 21 01 00 00 e8 d9 96 38 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 27 92 38 00 48 85 db 0f 84 17 01 00 00 b9 96 38 00 31 ff 65 8b 1d 60 df 48 06 81 e3 ff ff ff 7f 89 de
RSP: 0018:ffff88801acdff28 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff888043f65280 RCX: ffffffff817c2b86
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff813b5234
RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8643ac57 R11: 0000000000000001 R12: ffff888043f65280
R13: 0000000000000009 R14: ffff88801acdf7e0 R15: 0000000000000000
rewind_stack_and_make_dead+0x16/0x20
RIP: 0033:0x7fbc0eb64b19
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:00007fbc0c0da218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fbc0ec77f68 RCX: 00007fbc0eb64b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fbc0ec77f6c
RBP: 00007fbc0ec77f60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00007fbc0ec77f6c
R13: 00007ffd8a8badef R14: 00007fbc0c0da300 R15: 0000000000022000
Modules linked in:
CR2: ffffed10212c935e
---[ end trace 0000000000000000 ]---
RIP: 0010:apply_wqattrs_cleanup.part.0+0xbd/0x2b0
Code: dd 28 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 95 01 00 00 48 8b 5c dd 28 48 85 db 74 41 e8 8a af 32 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 a6 01 00 00 48 8b 3b e8 50 a8 7c 03 48 89 df
RSP: 0018:ffff888044fc76b8 EFLAGS: 00010216
RAX: 0000000060000000 RBX: 0000000300000000 RCX: ffffc90003c17000
RDX: 0000000000040000 RSI: ffffffff814137f6 RDI: ffff88800d87d330
RBP: ffff88800d87d300 R08: 0000000000000001 R09: ffffed10089f8ec7
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: fffffbfff0b0a4ac R14: ffffffffffffffff R15: 0000000000000001
FS: 00007fbc0c0da700(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed10212c935e CR3: 00000000453ce000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
0: dd 28 (bad) (%rax)
2: 48 89 f8 mov %rdi,%rax
5: 48 c1 e8 03 shr $0x3,%rax
9: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
e: 0f 85 95 01 00 00 jne 0x1a9
14: 48 8b 5c dd 28 mov 0x28(%rbp,%rbx,8),%rbx
19: 48 85 db test %rbx,%rbx
1c: 74 41 je 0x5f
1e: e8 8a af 32 00 callq 0x32afad
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 0f 85 a6 01 00 00 jne 0x1db
35: 48 8b 3b mov (%rbx),%rdi
38: e8 50 a8 7c 03 callq 0x37ca88d
3d: 48 89 df mov %rbx,%rdi