general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.6.102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:loopback_jiffies_timer_pos_update+0x13c/0x1250 sound/drivers/aloop.c:619
Code: fb 49 f9 44 89 f8 83 e0 02 44 89 7c 24 3c 75 0a e8 79 f7 49 f9 45 31 ff eb 27 e8 6f f7 49 f9 49 8d 5d 48 48 89 d8 48 c1 e8 03 <80> 3c 28 00 74 08 48 89 df e8 86 3e a1 f9 4d 89 f7 4c 2b 3b 4c 89
RSP: 0018:ffffc90000007ac8 EFLAGS: 00010006
RAX: 0000000000000009 RBX: 0000000000000048 RCX: ffffffff8ca93380
RDX: 0000000000000100 RSI: 0000000000000002 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f48 R12: 0000000000000002
R13: 0000000000000000 R14: 00000000ffffd239 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2e36ca CR3: 0000000061d78000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 loopback_jiffies_timer_function+0x62/0x250 sound/drivers/aloop.c:662
 call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x52d/0x7d0 kernel/time/timer.c:2022
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:148
Code: cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d e3 e6 3a 00 f3 0f 1e fa fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 66 0f 1f 00 55 41 57 41 56
RSP: 0018:ffffffff8ca07d80 EFLAGS: 000002c6
RAX: 6355c4849314c800 RBX: ffffffff8161914b RCX: 6355c4849314c800
RDX: 0000000000000001 RSI: ffffffff8aaab9c0 RDI: ffffffff8afc66c0
RBP: ffffffff8ca07eb8 R08: ffff8880b8e36d4b R09: 1ffff110171c6da9
R10: dffffc0000000000 R11: ffffed10171c6daa R12: ffffffff8e4a8828
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1952670
 arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:753
 default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
 cpuidle_idle_call kernel/sched/idle.c:170 [inline]
 do_idle+0x1eb/0x510 kernel/sched/idle.c:282
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:380
 rest_init+0x2e2/0x300 init/main.c:732
 arch_call_rest_init+0xe/0x10 init/main.c:829
 start_kernel+0x459/0x4e0 init/main.c:1074
 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555
 x86_64_start_kernel+0x60/0x60 arch/x86/kernel/head64.c:536
 secondary_startup_64_no_verify+0x179/0x17b
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:loopback_jiffies_timer_pos_update+0x13c/0x1250 sound/drivers/aloop.c:619
Code: fb 49 f9 44 89 f8 83 e0 02 44 89 7c 24 3c 75 0a e8 79 f7 49 f9 45 31 ff eb 27 e8 6f f7 49 f9 49 8d 5d 48 48 89 d8 48 c1 e8 03 <80> 3c 28 00 74 08 48 89 df e8 86 3e a1 f9 4d 89 f7 4c 2b 3b 4c 89
RSP: 0018:ffffc90000007ac8 EFLAGS: 00010006
RAX: 0000000000000009 RBX: 0000000000000048 RCX: ffffffff8ca93380
RDX: 0000000000000100 RSI: 0000000000000002 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f48 R12: 0000000000000002
R13: 0000000000000000 R14: 00000000ffffd239 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2e36ca CR3: 0000000061d78000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	fb                   	sti
   1:	49 f9                	rex.WB stc
   3:	44 89 f8             	mov    %r15d,%eax
   6:	83 e0 02             	and    $0x2,%eax
   9:	44 89 7c 24 3c       	mov    %r15d,0x3c(%rsp)
   e:	75 0a                	jne    0x1a
  10:	e8 79 f7 49 f9       	call   0xf949f78e
  15:	45 31 ff             	xor    %r15d,%r15d
  18:	eb 27                	jmp    0x41
  1a:	e8 6f f7 49 f9       	call   0xf949f78e
  1f:	49 8d 5d 48          	lea    0x48(%r13),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	48 89 df             	mov    %rbx,%rdi
  33:	e8 86 3e a1 f9       	call   0xf9a13ebe
  38:	4d 89 f7             	mov    %r14,%r15
  3b:	4c 2b 3b             	sub    (%rbx),%r15
  3e:	4c                   	rex.WR
  3f:	89                   	.byte 0x89