RBP: 00007fea241421d0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000010000027f R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd110d7e3f R14: 00007fea24142300 R15: 0000000000022000
 </TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 15042 Comm: syz-executor.0 Not tainted 6.3.0-rc7-next-20230418 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:folio_wait_stable+0x23/0xe0
Code: 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 fd 53 e8 32 58 e7 ff 48 8d 7d 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a4 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffff88804290f488 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffff888018833e20 RCX: ffffc900007e7000
RDX: 0000000000000001 RSI: ffffffff81647cce RDI: 000000000000000c
RBP: fffffffffffffff4 R08: 0000000000000001 R09: ffffffff856c1693
R10: fffffbfff0ad82d2 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888018834048 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fea24142700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2c525000 CR3: 000000000dd82000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ext4_da_write_begin+0x38d/0x830
 generic_perform_write+0x25a/0x580
 ext4_buffered_write_iter+0x164/0x460
 ext4_file_write_iter+0x3ff/0x1950
 do_iter_readv_writev+0x211/0x3c0
 do_iter_write+0x189/0x7e0
 vfs_iter_write+0x74/0xb0
 iter_file_splice_write+0x73f/0xcb0
 direct_splice_actor+0x113/0x180
 splice_direct_to_actor+0x33a/0x8c0
 do_splice_direct+0x1bc/0x290
 do_sendfile+0xb1d/0x12b0
 __x64_sys_sendfile64+0x1d5/0x210
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7fea26bccb19
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:00007fea24142188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fea26cdff60 RCX: 00007fea26bccb19
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007fea241421d0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000010000027f R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffd110d7e3f R14: 00007fea24142300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:folio_wait_stable+0x23/0xe0
Code: 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 fd 53 e8 32 58 e7 ff 48 8d 7d 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a4 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffff88804290f488 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffff888018833e20 RCX: ffffc900007e7000
RDX: 0000000000000001 RSI: ffffffff81647cce RDI: 000000000000000c
RBP: fffffffffffffff4 R08: 0000000000000001 R09: ffffffff856c1693
R10: fffffbfff0ad82d2 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888018834048 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fea24142700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2c525000 CR3: 000000000dd82000 CR4: 0000000000350ef0
FAULT_INJECTION: forcing a failure.
name fail_page_alloc, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 15063 Comm: syz-executor.2 Tainted: G      D            6.3.0-rc7-next-20230418 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xc1/0xf0
 should_fail_ex+0x4b4/0x5b0
 prepare_alloc_pages+0x178/0x500
 __alloc_pages+0x149/0x480
 alloc_pages+0x1a0/0x260
 filemap_alloc_folio+0x374/0x410
 __filemap_get_folio+0x285/0x8d0
 ext4_da_write_begin+0x374/0x830
 generic_perform_write+0x25a/0x580
 ext4_buffered_write_iter+0x164/0x460
 ext4_file_write_iter+0x3ff/0x1950
 do_iter_readv_writev+0x211/0x3c0
 do_iter_write+0x189/0x7e0
 vfs_iter_write+0x74/0xb0
 iter_file_splice_write+0x73f/0xcb0
 direct_splice_actor+0x113/0x180
 splice_direct_to_actor+0x33a/0x8c0
 do_splice_direct+0x1bc/0x290
 do_sendfile+0xb1d/0x12b0
 __x64_sys_sendfile64+0x1d5/0x210
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7fd6a408fb19
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:00007fd6a1605188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd6a41a2f60 RCX: 00007fd6a408fb19
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007fd6a16051d0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000010000027f R11: 0000000000000246 R12: 0000000000000002
R13: 00007fff5dcfb2bf R14: 00007fd6a1605300 R15: 0000000000022000
 </TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#2] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 15063 Comm: syz-executor.2 Tainted: G      D            6.3.0-rc7-next-20230418 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:folio_wait_stable+0x23/0xe0
Code: 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 fd 53 e8 32 58 e7 ff 48 8d 7d 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a4 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffff88804453f488 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffff888045819680 RCX: ffffc90000be9000
RDX: 0000000000000001 RSI: ffffffff81647cce RDI: 000000000000000c
RBP: fffffffffffffff4 R08: 0000000000000001 R09: ffffffff856c1693
R10: fffffbfff0ad82d2 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8880458198a8 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fd6a1605700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562dcdf4ea38 CR3: 00000000442f6000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 ext4_da_write_begin+0x38d/0x830
 generic_perform_write+0x25a/0x580
 ext4_buffered_write_iter+0x164/0x460
 ext4_file_write_iter+0x3ff/0x1950
FAULT_INJECTION: forcing a failure.
name fail_page_alloc, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 15071 Comm: syz-executor.3 Tainted: G      D            6.3.0-rc7-next-20230418 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xc1/0xf0
 should_fail_ex+0x4b4/0x5b0
 prepare_alloc_pages+0x178/0x500
 do_iter_readv_writev+0x211/0x3c0
 __alloc_pages+0x149/0x480
 do_iter_write+0x189/0x7e0
 vfs_iter_write+0x74/0xb0
 iter_file_splice_write+0x73f/0xcb0
 alloc_pages+0x1a0/0x260
 filemap_alloc_folio+0x374/0x410
 __filemap_get_folio+0x285/0x8d0
 ext4_da_write_begin+0x374/0x830
 direct_splice_actor+0x113/0x180
 splice_direct_to_actor+0x33a/0x8c0
 generic_perform_write+0x25a/0x580
 do_splice_direct+0x1bc/0x290
 ext4_buffered_write_iter+0x164/0x460
 ext4_file_write_iter+0x3ff/0x1950
 do_sendfile+0xb1d/0x12b0
 __x64_sys_sendfile64+0x1d5/0x210
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7fd6a408fb19
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:00007fd6a1605188 EFLAGS: 00000246
 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd6a41a2f60 RCX: 00007fd6a408fb19
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007fd6a16051d0 R08: 0000000000000000 R09: 0000000000000000
 do_iter_readv_writev+0x211/0x3c0
R10: 000000010000027f R11: 0000000000000246 R12: 0000000000000002
R13: 00007fff5dcfb2bf R14: 00007fd6a1605300 R15: 0000000000022000
 </TASK>
Modules linked in:
 do_iter_write+0x189/0x7e0
---[ end trace 0000000000000000 ]---
RIP: 0010:folio_wait_stable+0x23/0xe0
Code: 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 fd 53 e8 32 58 e7 ff 48 8d 7d 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a4 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
 vfs_iter_write+0x74/0xb0
RSP: 0018:ffff88804290f488 EFLAGS: 00010213
 iter_file_splice_write+0x73f/0xcb0

RAX: dffffc0000000000 RBX: ffff888018833e20 RCX: ffffc900007e7000
RDX: 0000000000000001 RSI: ffffffff81647cce RDI: 000000000000000c
RBP: fffffffffffffff4 R08: 0000000000000001 R09: ffffffff856c1693
R10: fffffbfff0ad82d2 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888018834048 R14: 0000000000000000 R15: 0000000000000000
 direct_splice_actor+0x113/0x180
FS:  00007fd6a1605700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
 splice_direct_to_actor+0x33a/0x8c0
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562dcdf4ea38 CR3: 00000000442f6000 CR4: 0000000000350ee0
 do_splice_direct+0x1bc/0x290
 do_sendfile+0xb1d/0x12b0
 __x64_sys_sendfile64+0x1d5/0x210
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f76bc7e6b19
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:00007f76b9d5c188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f76bc8f9f60 RCX: 00007f76bc7e6b19
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005
RBP: 00007f76b9d5c1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000010000027f R11: 0000000000000246 R12: 0000000000000002
R13: 00007fffeb118f6f R14: 00007f76b9d5c300 R15: 0000000000022000
 </TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#3] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 15071 Comm: syz-executor.3 Tainted: G      D            6.3.0-rc7-next-20230418 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:folio_wait_stable+0x23/0xe0
Code: 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 fd 53 e8 32 58 e7 ff 48 8d 7d 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a4 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffff888044567488 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffff888043c29680 RCX: ffffc900023f5000
RDX: 0000000000000001 RSI: ffffffff81647cce RDI: 000000000000000c
RBP: fffffffffffffff4 R08: 0000000000000001 R09: ffffffff856c1693
R10: fffffbfff0ad82d2 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888043c298a8 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f76b9d5c700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76b9d5bf78 CR3: 0000000042fb8000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ext4_da_write_begin+0x38d/0x830
 generic_perform_write+0x25a/0x580
 ext4_buffered_write_iter+0x164/0x460
 ext4_file_write_iter+0x3ff/0x1950
 do_iter_readv_writev+0x211/0x3c0
 do_iter_write+0x189/0x7e0
 vfs_iter_write+0x74/0xb0
 iter_file_splice_write+0x73f/0xcb0
 direct_splice_actor+0x113/0x180
 splice_direct_to_actor+0x33a/0x8c0
 do_splice_direct+0x1bc/0x290
 do_sendfile+0xb1d/0x12b0
 __x64_sys_sendfile64+0x1d5/0x210
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f76bc7e6b19
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:00007f76b9d5c188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f76bc8f9f60 RCX: 00007f76bc7e6b19
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005
RBP: 00007f76b9d5c1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000010000027f R11: 0000000000000246 R12: 0000000000000002
R13: 00007fffeb118f6f R14: 00007f76b9d5c300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:folio_wait_stable+0x23/0xe0
Code: 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 fd 53 e8 32 58 e7 ff 48 8d 7d 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a4 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffff88804290f488 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffff888018833e20 RCX: ffffc900007e7000
RDX: 0000000000000001 RSI: ffffffff81647cce RDI: 000000000000000c
RBP: fffffffffffffff4 R08: 0000000000000001 R09: ffffffff856c1693
R10: fffffbfff0ad82d2 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888018834048 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f76b9d5c700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76b9d5bf78 CR3: 0000000042fb8000 CR4: 0000000000350ef0
==================================================================
BUG: KASAN: slab-use-after-free in rwsem_down_write_slowpath+0x13a6/0x14a0
Read of size 4 at addr ffff888015beb5b4 by task syz-executor.0/268

CPU: 1 PID: 268 Comm: syz-executor.0 Tainted: G      D            6.3.0-rc7-next-20230418 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x91/0xf0
 print_report+0xcc/0x620
 kasan_report+0xc0/0xf0
 rwsem_down_write_slowpath+0x13a6/0x14a0
 down_write+0x1c3/0x1f0
 vfs_unlink+0xd9/0x930
 do_unlinkat+0x3b9/0x650
 __x64_sys_unlink+0xca/0x110
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7fea26bcc457
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 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:00007ffd110d6f88 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fea26bcc457
RDX: 00007ffd110d6fc0 RSI: 00007ffd110d6fc0 RDI: 00007ffd110d7050
RBP: 00007ffd110d7050 R08: 0000000000000001 R09: 00007ffd110d6e20
R10: 000055555611dd13 R11: 0000000000000206 R12: 00007fea26c26105
R13: 00007ffd110d8110 R14: 000055555611dc20 R15: 00007ffd110d8150
 </TASK>

Allocated by task 15035:
 kasan_save_stack+0x22/0x50
 kasan_set_track+0x25/0x30
 __kasan_slab_alloc+0x59/0x70
 kmem_cache_alloc_node+0x189/0x3a0
 copy_process+0x3c2/0x7330
 kernel_clone+0xeb/0x7d0
 __do_sys_clone+0xba/0x100
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc

Freed by task 19:
 kasan_save_stack+0x22/0x50
 kasan_set_track+0x25/0x30
 kasan_save_free_info+0x2e/0x50
 __kasan_slab_free+0x10a/0x190
 kmem_cache_free+0xff/0x4a0
 delayed_put_task_struct+0x1c9/0x240
 rcu_core+0x899/0x2750
 __do_softirq+0x1b7/0x7d4

Last potentially related work creation:
 kasan_save_stack+0x22/0x50
 __kasan_record_aux_stack+0x95/0xb0
 __call_rcu_common.constprop.0+0x6a/0xb90
 put_task_struct_rcu_user+0x87/0xd0
 __schedule+0x995/0x2a00
 schedule+0xdb/0x1a0
 do_nanosleep+0x154/0x510
 hrtimer_nanosleep+0x208/0x590
 common_nsleep+0xaa/0xd0
 __x64_sys_clock_nanosleep+0x335/0x480
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc

Second to last potentially related work creation:
 kasan_save_stack+0x22/0x50
 __kasan_record_aux_stack+0x95/0xb0
 __call_rcu_common.constprop.0+0x6a/0xb90
 put_task_struct_rcu_user+0x87/0xd0
 wait_consider_task+0x2f59/0x3c40
 do_wait+0x777/0xbc0
 kernel_wait4+0x150/0x260
 __do_sys_wait4+0x143/0x150
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc

The buggy address belongs to the object at ffff888015beb580
 which belongs to the cache task_struct of size 6592
The buggy address is located 52 bytes inside of
 freed 6592-byte region [ffff888015beb580, ffff888015becf40)

The buggy address belongs to the physical page:
page:00000000eabb2857 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15be8
head:00000000eabb2857 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800d2c7981
flags: 0x100000000010200(slab|head|node=0|zone=1)
page_type: 0xffffffff()
raw: 0100000000010200 ffff888008797640 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88800d2c7981
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888015beb480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888015beb500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888015beb580: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff888015beb600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888015beb680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	90                   	nop
   3:	90                   	nop
   4:	90                   	nop
   5:	90                   	nop
   6:	90                   	nop
   7:	f3 0f 1e fa          	endbr64
   b:	55                   	push   %rbp
   c:	48 89 fd             	mov    %rdi,%rbp
   f:	53                   	push   %rbx
  10:	e8 32 58 e7 ff       	callq  0xffe75847
  15:	48 8d 7d 18          	lea    0x18(%rbp),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 a4 00 00 00    	jne    0xd8
  34:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  3b:	fc ff df
  3e:	48                   	rex.W
  3f:	8b                   	.byte 0x8b