Oops: general protection fault, probably for non-canonical address 0xdffffc0020000032: 0000 [#1] SMP KASAN NOPTI
KASAN: probably user-memory-access in range [0x0000000100000190-0x0000000100000197]
CPU: 1 UID: 0 PID: 3961 Comm: syz-executor.6 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: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:ffff88804730f800 EFLAGS: 00010212
RAX: 0000000020000032 RBX: 00000000ffffffa0 RCX: ffffc9000d443000
RDX: 0000000000040000 RSI: ffffffff818995b7 RDI: 0000000100000190
RBP: ffff88804730fa70 R08: ffff88806cf31340 R09: ffffe8ffffd15f68
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: 000000000000002c R14: ffff88806cf31340 R15: dffffc0000000000
FS: 00007ff1b6ea0700(0000) GS:ffff8880e56dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff1b6e9ff40 CR3: 000000000e7c4000 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: 0033:0x7ff1b992ab19
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:00007ff1b6ea0218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007ff1b9a3df68 RCX: 00007ff1b992ab19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007ff1b9a3df6c
RBP: 00007ff1b9a3df60 R08: 0000000000000016 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007ff1b9a3df6c
R13: 00007ffd948b114f R14: 00007ff1b6ea0300 R15: 0000000000022000
Modules linked in:
---[ end trace 0000000000000000 ]---
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:ffff88804730f800 EFLAGS: 00010212
RAX: 0000000020000032 RBX: 00000000ffffffa0 RCX: ffffc9000d443000
RDX: 0000000000040000 RSI: ffffffff818995b7 RDI: 0000000100000190
RBP: ffff88804730fa70 R08: ffff88806cf31340 R09: ffffe8ffffd15f68
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: 000000000000002c R14: ffff88806cf31340 R15: dffffc0000000000
FS: 00007ff1b6ea0700(0000) GS:ffff8880e56dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff1b6e9ff40 CR3: 000000000e7c4000 CR4: 0000000000350ef0
note: syz-executor.6[3961] exited with preempt_count 1
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:575
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 3961, name: syz-executor.6
preempt_count: 0, expected: 0
RCU nest depth: 2, expected: 0
INFO: lockdep is turned off.
CPU: 1 UID: 0 PID: 3961 Comm: syz-executor.6 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+0xfa/0x120
__might_resched+0x2f3/0x510
__mutex_lock+0xb3/0x1020
io_uring_del_tctx_node+0x104/0x2d0
io_uring_clean_tctx+0xc2/0x190
io_uring_cancel_generic+0x723/0x960
do_exit+0x2ce/0x2970
make_task_dead+0x174/0x3b0
rewind_stack_and_make_dead+0x16/0x20
RIP: 0033:0x7ff1b992ab19
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:00007ff1b6ea0218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007ff1b9a3df68 RCX: 00007ff1b992ab19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007ff1b9a3df6c
RBP: 00007ff1b9a3df60 R08: 0000000000000016 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007ff1b9a3df6c
R13: 00007ffd948b114f R14: 00007ff1b6ea0300 R15: 0000000000022000
kmemleak: Found object by alias at 0x607f1a638f7c
CPU: 1 UID: 0 PID: 3964 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
get_signal+0x2315/0x2340
arch_do_signal_or_restart+0x80/0x790
exit_to_user_mode_loop+0x8b/0x110
do_syscall_64+0x2f7/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe8ef913b19
Code: Unable to access opcode bytes at 0x7fe8ef913aef.
RSP: 002b:00007fe8ece89188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: 0000000000000000 RBX: 00007fe8efa26f60 RCX: 00007fe8ef913b19
RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 0000000000000000
RBP: 00007fe8ef96df6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff2204b9bf R14: 00007fe8ece89300 R15: 0000000000022000
kmemleak: Object (percpu) 0x607f1a638f78 (size 8):
kmemleak: comm "syz-executor.4", pid 3983, jiffies 4294789252
kmemleak: min_count = 1
kmemleak: count = 0
kmemleak: flags = 0x21
kmemleak: checksum = 0
kmemleak: backtrace:
pcpu_alloc_noprof+0x87a/0x1170
perf_trace_event_init+0x366/0xa10
perf_trace_init+0x1a4/0x2f0
perf_tp_event_init+0xa6/0x120
perf_try_init_event+0x140/0x9f0
perf_event_alloc.part.0+0x118e/0x45f0
__do_sys_perf_event_open+0x719/0x2c20
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
kmemleak: Found object by alias at 0x607f1a638f6c
CPU: 1 UID: 0 PID: 3989 Comm: syz-executor.6 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
get_signal+0x2315/0x2340
arch_do_signal_or_restart+0x80/0x790
exit_to_user_mode_loop+0x8b/0x110
do_syscall_64+0x2f7/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff1b992ab19
Code: Unable to access opcode bytes at 0x7ff1b992aaef.
RSP: 002b:00007ff1b6e7f218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007ff1b9a3e028 RCX: 00007ff1b992ab19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007ff1b9a3e02c
RBP: 00007ff1b9a3e020 R08: 000000000000000e R09: 0000000000000000
R10: 000000000000000b R11: 0000000000000246 R12: 00007ff1b9a3e02c
R13: 00007ffd948b114f R14: 00007ff1b6e7f300 R15: 0000000000022000
kmemleak: Object (percpu) 0x607f1a638f68 (size 8):
kmemleak: comm "syz-executor.5", pid 3964, jiffies 4294789213
kmemleak: min_count = 1
kmemleak: count = 0
kmemleak: flags = 0x21
kmemleak: checksum = 0
kmemleak: backtrace:
pcpu_alloc_noprof+0x87a/0x1170
alloc_vfsmnt+0x135/0x6e0
vfs_create_mount.part.0+0x40/0x440
path_mount+0x1637/0x1dd0
__x64_sys_mount+0x27b/0x300
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000032: 0000 [#2] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000190-0x0000000000000197]
CPU: 0 UID: 0 PID: 3993 Comm: syz-executor.0 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
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:ffff88804775f600 EFLAGS: 00010212
RAX: 0000000000000032 RBX: ffffffffffffffa1 RCX: 0000000000000002
RDX: ffff88801723d280 RSI: ffffffff818995b7 RDI: 0000000000000191
RBP: ffff88804775f870 R08: ffff88806ce31340 R09: ffffe8ffffc15f78
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 000000000000002c R14: ffff88806ce31340 R15: dffffc0000000000
FS: 00005555835be400(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb74b1bf000 CR3: 000000004511e000 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_wait_setup+0xae/0x550
__futex_wait+0x151/0x300
futex_wait+0xde/0x380
do_futex+0x2ee/0x370
__x64_sys_futex+0x1c9/0x4d0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb74b0afb19
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:00007fff7ec45d78 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000000032 RCX: 00007fb74b0afb19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb74b1c2f6c
RBP: 00007fb74b1c2f6c R08: 00007fb74b19f000 R09: 0000000000000000
R10: 00007fff7ec45e50 R11: 0000000000000246 R12: 000000000001e038
R13: 00000000000003e8 R14: 00007fb74b1c2f60 R15: 000000000001e024
Modules linked in:
Oops: general protection fault, probably for non-canonical address 0xdffffc0020000032: 0000 [#3] SMP KASAN NOPTI
KASAN: probably user-memory-access in range [0x0000000100000190-0x0000000100000197]
CPU: 1 UID: 0 PID: 4002 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
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:ffff88806cf08a80 EFLAGS: 00010012
RAX: 0000000020000032 RBX: 00000000ffffffa0 RCX: 0000000000000002
RDX: ffff888017279b80 RSI: ffffffff818995b7 RDI: 0000000100000190
RBP: ffff88806cf08cf0 R08: ffff88806cf31490 R09: ffffe8ffffd15f78
R10: 0000000000000000 R11: 746e756f63716573 R12: dffffc0000000000
R13: 000000000000002c R14: ffff88806cf31490 R15: dffffc0000000000
FS: 00007fe8ece89700(0000) GS:ffff8880e56dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fda80dfc018 CR3: 0000000045988000 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:format_decode+0x626/0xd00
Code: 10 48 ba 00 00 00 00 00 fc ff df 48 c7 04 10 00 00 00 00 48 8b 44 24 78 65 48 2b 05 0c 05 cc 02 0f 85 57 05 00 00 48 83 ec 80 <4c> 89 e0 4c 89 ea 5b 41 5c 41 5d 41 5e 41 5f 5d e9 e5 db 05 00 e8
RSP: 0018:ffff888016e874a8 EFLAGS: 00000283
RAX: 0000000000000000 RBX: ffff888016e87560 RCX: ffffc90007413000
RDX: dffffc0000000000 RSI: ffffffff84b82ad8 RDI: 0000000000000001
RBP: ffff888016e874d0 R08: 206c6172656e6567 R09: 69746365746f7270
R10: 0000000000000025 R11: 202c746c75616620 R12: ffffffff84c206ff
R13: 0000000000000400 R14: 0000000000000025 R15: dffffc0000000000
vsnprintf+0x186/0x1160
snprintf+0xbe/0x100
exc_general_protection+0x319/0x330
asm_exc_general_protection+0x26/0x30
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:ffff888016e87800 EFLAGS: 00010212
RAX: 0000000020000032 RBX: 00000000ffffffa0 RCX: ffffc90007413000
RDX: 0000000000040000 RSI: ffffffff818995b7 RDI: 0000000100000190
RBP: ffff888016e87a70 R08: ffff88806cf31340 R09: ffffe8ffffd15f78
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 000000000000002c R14: ffff88806cf31340 R15: dffffc0000000000
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: 0033:0x7fe8ef913b19
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:00007fe8ece89218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fe8efa26f68 RCX: 00007fe8ef913b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fe8efa26f6c
RBP: 00007fe8efa26f60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe8efa26f6c
R13: 00007fff2204b9bf R14: 00007fe8ece89300 R15: 0000000000022000
Modules linked in:
---[ end trace 0000000000000000 ]---
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000032: 0000 [#4] SMP KASAN NOPTI
RIP: 0010:perf_tp_event+0x175/0xe70
KASAN: null-ptr-deref in range [0x0000000000000190-0x0000000000000197]
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
CPU: 0 UID: 0 PID: 3993 Comm: syz-executor.0 Tainted: G D W 6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary)
RSP: 0018:ffff88804730f800 EFLAGS: 00010212
Tainted: [D]=DIE, [W]=WARN
RAX: 0000000020000032 RBX: 00000000ffffffa0 RCX: ffffc9000d443000
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RDX: 0000000000040000 RSI: ffffffff818995b7 RDI: 0000000100000190
RIP: 0010:perf_tp_event+0x175/0xe70
RBP: ffff88804730fa70 R08: ffff88806cf31340 R09: ffffe8ffffd15f68
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
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
RSP: 0018:ffff88806ce08a80 EFLAGS: 00010012
R13: 000000000000002c R14: ffff88806cf31340 R15: dffffc0000000000
RAX: 0000000000000032 RBX: ffffffffffffffa1 RCX: 0000000000000002
FS: 00007fe8ece89700(0000) GS:ffff8880e56dd000(0000) knlGS:0000000000000000
RDX: ffff88801723d280 RSI: ffffffff818995b7 RDI: 0000000000000191
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
RBP: ffff88806ce08cf0 R08: ffff88806ce31490 R09: ffffe8ffffc15f78
CR2: 00007fda80dfc018 CR3: 0000000045988000 CR4: 0000000000350ef0
R10: 0000000000000000 R11: 746e756f63716573 R12: dffffc0000000000
----------------
Code disassembly (best guess), 1 bytes skipped:
0: df 48 89 fisttps -0x77(%rax)
3: 85 a8 fd ff ff 48 test %ebp,0x48fffffd(%rax)
9: c1 e8 03 shr $0x3,%eax
c: 4c 01 e0 add %r12,%rax
f: 48 89 85 c8 fd ff ff mov %rax,-0x238(%rbp)
16: e8 c9 51 ea ff callq 0xffea51e4
1b: 48 8d bb f0 01 00 00 lea 0x1f0(%rbx),%rdi
22: 48 89 f8 mov %rdi,%rax
25: 48 c1 e8 03 shr $0x3,%rax
* 29: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 74 08 je 0x3a
32: 3c 03 cmp $0x3,%al
34: 0f 8e c5 0b 00 00 jle 0xbff
3a: 44 rex.R
3b: 8b .byte 0x8b
3c: ab stos %eax,%es:(%rdi)
3d: f0 lock
3e: 01 .byte 0x1