__x64_sys_io_uring_setup+0xc8/0x170
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
------------[ cut here ]------------
percpu ref (io_ring_ctx_ref_free) <= 0 (-4294967295) after switching to atomic
WARNING: lib/percpu-refcount.c:197 at percpu_ref_switch_to_atomic_rcu+0x3cc/0x480, CPU#1: syz-executor.5/3956
Modules linked in:
CPU: 1 UID: 0 PID: 3956 Comm: syz-executor.5 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:percpu_ref_switch_to_atomic_rcu+0x3cc/0x480
Code: 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 9e 00 00 00 49 8b 75 e8 48 c7 c7 80 97 e2 84 e8 75 c5 e9 fe 90 <0f> 0b 90 90 e9 2b ff ff ff e8 f6 de 5f ff e9 9e fe ff ff e8 7c df
RSP: 0018:ffff88806cf08e20 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8139de70
RDX: ffff88800a78b700 RSI: ffffffff8139de7e RDI: 0000000000000001
RBP: 7fffffff00000000 R08: 0000000000000001 R09: ffffed100d9e4801
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800e6ca500
R13: ffff88800e6ca520 R14: 0000000000000002 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff8880e56dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2cb22000 CR3: 000000000e3cf000 CR4: 0000000000350ef0
Call Trace:
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
RIP: 0010:_raw_spin_unlock_irqrestore+0x34/0x50
Code: c7 18 53 48 89 f3 48 8b 74 24 10 e8 16 f5 93 fc 48 89 ef e8 4e 40 94 fc 80 e7 02 74 06 e8 b4 48 be fc fb 65 ff 0d 6c 4c c6 02 <74> 07 5b 5d e9 33 23 00 00 0f 1f 44 00 00 5b 5d e9 27 23 00 00 0f
RSP: 0018:ffff88800fdbfd50 EFLAGS: 00000286
RAX: 0000000000000ba5 RBX: 0000000000000203 RCX: ffffffff817c2b86
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff84bde3bc
RBP: ffffffff85d091e0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8643ac57 R11: 0000000000000001 R12: 0000607f1a639af4
R13: ffff88801c8f5d20 R14: 0000000000000000 R15: ffff888017d586c0
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: 0033:0x7fc06c02ab19
Code: Unable to access opcode bytes at 0x7fc06c02aaef.
RSP: 002b:00007ffc4c3eb408 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007fc06c02ab19
RDX: 00007fc06bfdd72b RSI: ffffffffffffffbc RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000001b2d125678 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffc4c3eb4f0
irq event stamp: 3602
hardirqs last enabled at (3612): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (3619): [] __up_console_sem+0x5d/0x80
softirqs last enabled at (2744): [] handle_softirqs+0x50c/0x770
softirqs last disabled at (2983): [] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
percpu_ref_switch_to_atomic_rcu: percpu_ref_switch_to_atomic_rcu(): percpu_ref underflow slab kmalloc-64 start ffff88800e6ca500 pointer offset 0 size 64
Oops: general protection fault, probably for non-canonical address 0xfdfffc0000000032: 0000 [#1] SMP KASAN NOPTI
KASAN: maybe wild-memory-access in range [0xf000000000000190-0xf000000000000197]
CPU: 0 UID: 0 PID: 3979 Comm: syz-executor.3 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:ffff888045f777c0 EFLAGS: 00010212
RAX: 1e00000000000032 RBX: efffffffffffffa0 RCX: ffffc90009839000
RDX: 0000000000040000 RSI: ffffffff818995b7 RDI: f000000000000190
RBP: ffff888045f77a30 R08: ffff88806ce31340 R09: ffffe8ffffc16af0
R10: 0000000000000000 R11: 000000000000002c R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88806ce31340 R15: dffffc0000000000
FS: 00007ff377dcb700(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff37a969018 CR3: 000000000d536000 CR4: 0000000000350ef0
Call Trace:
perf_trace_run_bpf_submit+0xef/0x180
perf_trace_lock_acquire+0x3c2/0x700
lock_acquire+0xc5/0x2f0
futex_private_hash_put+0x5d/0x2d0
futex_hash_put+0x3f/0x50
futex_wake+0x1bb/0x540
do_futex+0x26d/0x370
__x64_sys_futex+0x1c9/0x4d0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff37a855b19
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:00007ff377dcb218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007ff37a968f68 RCX: 00007ff37a855b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007ff37a968f6c
RBP: 00007ff37a968f60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00007ff37a968f6c
R13: 00007ffeccb3acaf R14: 00007ff377dcb300 R15: 0000000000022000
Modules linked in:
Oops: general protection fault, probably for non-canonical address 0xfdfffc0000000032: 0000 [#2] SMP KASAN NOPTI
KASAN: maybe wild-memory-access in range [0xf000000000000190-0xf000000000000197]
CPU: 0 UID: 0 PID: 3979 Comm: syz-executor.3 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:ffff88806ce08a40 EFLAGS: 00010012
RAX: 1e00000000000032 RBX: efffffffffffffa0 RCX: ffffffff81898973
RDX: ffff888014325280 RSI: ffffffff818995b7 RDI: f000000000000190
RBP: ffff88806ce08cb0 R08: ffff88806ce31490 R09: ffffe8ffffc16af0
R10: 0000000000000000 R11: 0000000000000024 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88806ce31490 R15: dffffc0000000000
FS: 00007ff377dcb700(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff37a969018 CR3: 000000000d536000 CR4: 0000000000350ef0
Call Trace:
perf_trace_run_bpf_submit+0xef/0x180
perf_trace_lock_acquire+0x3c2/0x700
lock_acquire+0xc5/0x2f0
_raw_spin_lock_nested+0x29/0x40
sched_ttwu_pending+0xa1/0x4a0
__flush_smp_call_function_queue+0x434/0x740
__sysvec_call_function_single+0x6d/0x370
sysvec_call_function_single+0xa1/0xc0
asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:oops_exit+0x0/0x50
Code: f1 39 00 be ff ff ff ff 48 c7 c7 50 ac 43 86 e8 c6 0f f9 ff 5b e9 20 f1 39 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 53 e8 06 f1 39 00 8b 1d c0 ed 4e 06 31 ff 89 de e8 27
RSP: 0018:ffff888045f77650 EFLAGS: 00000202
RAX: 0000000000029af1 RBX: 0000000000000216 RCX: ffffc90009839000
RDX: 0000000000040000 RSI: ffffffff812a3dca RDI: 0000000000000007
RBP: 000000000000000b R08: 0000000000000001 R09: fffffbfff0f11c90
R10: 0000000000000000 R11: 000000000000002c R12: ffff888045f77718
R13: 0000000000000000 R14: fdfffc0000000032 R15: 0000000000000000
oops_end+0x65/0xe0
exc_general_protection+0x1a2/0x330
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:ffff888045f777c0 EFLAGS: 00010212
RAX: 1e00000000000032 RBX: efffffffffffffa0 RCX: ffffc90009839000
RDX: 0000000000040000 RSI: ffffffff818995b7 RDI: f000000000000190
RBP: ffff888045f77a30 R08: ffff88806ce31340 R09: ffffe8ffffc16af0
R10: 0000000000000000 R11: 000000000000002c R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88806ce31340 R15: dffffc0000000000
perf_trace_run_bpf_submit+0xef/0x180
perf_trace_lock_acquire+0x3c2/0x700
lock_acquire+0xc5/0x2f0
futex_private_hash_put+0x5d/0x2d0
futex_hash_put+0x3f/0x50
futex_wake+0x1bb/0x540
do_futex+0x26d/0x370
__x64_sys_futex+0x1c9/0x4d0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff37a855b19
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:00007ff377dcb218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007ff37a968f68 RCX: 00007ff37a855b19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007ff37a968f6c
RBP: 00007ff37a968f60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00007ff37a968f6c
R13: 00007ffeccb3acaf R14: 00007ff377dcb300 R15: 0000000000022000
Modules linked in:
---[ end trace 0000000000000000 ]---
Oops: general protection fault, probably for non-canonical address 0xdffffc0020000032: 0000 [#3] SMP KASAN NOPTI
RIP: 0010:perf_tp_event+0x175/0xe70
KASAN: probably user-memory-access in range [0x0000000100000190-0x0000000100000197]
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: 1 UID: 0 PID: 3980 Comm: syz-executor.5 Tainted: G D W 6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary)
RSP: 0018:ffff888045f777c0 EFLAGS: 00010212
Tainted: [D]=DIE, [W]=WARN
RAX: 1e00000000000032 RBX: efffffffffffffa0 RCX: ffffc90009839000
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RDX: 0000000000040000 RSI: ffffffff818995b7 RDI: f000000000000190
RIP: 0010:perf_tp_event+0x175/0xe70
RBP: ffff888045f77a30 R08: ffff88806ce31340 R09: ffffe8ffffc16af0
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: 000000000000002c R12: dffffc0000000000
RSP: 0018:ffff888046807600 EFLAGS: 00010212
R13: 0000000000000000 R14: ffff88806ce31340 R15: dffffc0000000000
FS: 00007ff377dcb700(0000) GS:ffff8880e55dd000(0000) knlGS:0000000000000000
RAX: 0000000020000032 RBX: 00000000ffffffa0 RCX: ffffc90007427000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
RDX: 0000000000040000 RSI: ffffffff818995b7 RDI: 0000000100000190
CR2: 00007ff37a969018 CR3: 000000000d536000 CR4: 0000000000350ef0
RBP: ffff888046807870 R08: ffff88806cf31340 R09: ffffe8ffffd16af0
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 18 53 48 sbb %dl,0x48(%rbx)
3: 89 f3 mov %esi,%ebx
5: 48 8b 74 24 10 mov 0x10(%rsp),%rsi
a: e8 16 f5 93 fc callq 0xfc93f525
f: 48 89 ef mov %rbp,%rdi
12: e8 4e 40 94 fc callq 0xfc944065
17: 80 e7 02 and $0x2,%bh
1a: 74 06 je 0x22
1c: e8 b4 48 be fc callq 0xfcbe48d5
21: fb sti
22: 65 ff 0d 6c 4c c6 02 decl %gs:0x2c64c6c(%rip) # 0x2c64c95
* 29: 74 07 je 0x32 <-- trapping instruction
2b: 5b pop %rbx
2c: 5d pop %rbp
2d: e9 33 23 00 00 jmpq 0x2365
32: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
37: 5b pop %rbx
38: 5d pop %rbp
39: e9 27 23 00 00 jmpq 0x2365
3e: 0f .byte 0xf