general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
CPU: 1 PID: 6873 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:loopback_jiffies_timer_pos_update+0x13c/0x1250 sound/drivers/aloop.c:619
Code: 77 3d f9 44 89 f8 83 e0 02 44 89 7c 24 3c 75 0a e8 79 73 3d f9 45 31 ff eb 27 e8 6f 73 3d f9 49 8d 5d 48 48 89 d8 48 c1 e8 03 <80> 3c 28 00 74 08 48 89 df e8 46 a2 95 f9 4d 89 f7 4c 2b 3b 4c 89
RSP: 0018:ffffc900001f0ac8 EFLAGS: 00010006
RAX: 0000000000000009 RBX: 0000000000000048 RCX: ffff8880287c0000
RDX: 0000000000000100 RSI: 0000000000000002 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003e148 R12: 0000000000000003
R13: 0000000000000000 R14: 00000000ffffed09 R15: 0000000000000003
FS: 00007f1d51b67880(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000032000 CR3: 000000002e9fa000 CR4: 00000000003506e0
Call Trace:
loopback_jiffies_timer_function+0x62/0x250 sound/drivers/aloop.c:662
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x542/0x800 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
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+0xd3/0x190 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
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__sanitizer_cov_trace_switch+0x28/0x120 kernel/kcov.c:-1
Code: c3 90 f3 0f 1e fa 48 8b 06 48 8b 4e 08 48 83 c1 f8 48 c1 c1 3d 48 83 f9 02 7f 1e 48 85 c9 74 3c 48 83 f9 01 0f 85 ee 00 00 00 03 00 00 00 48 85 c0 75 36 e9 df 00 00 00 48 83 f9 03 0f 84 c7
RSP: 0018:ffffc90003857430 EFLAGS: 00000246
RAX: 0000000000000008 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8cf9e760 RDI: 0000000000000005
RBP: ffffc90003857558 R08: ffff8880287c0000 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90003857508
R13: dffffc0000000000 R14: 0000000000000005 R15: ffffffff8f18e88a
unwind_next_frame+0x742/0x2970 arch/x86/kernel/unwind_orc.c:515
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x11a/0x2d0 mm/slub.c:3519
kmem_cache_zalloc include/linux/slab.h:711 [inline]
alloc_empty_file+0x9e/0x1d0 fs/file_table.c:206
path_openat+0x113/0x3230 fs/namei.c:3783
do_filp_open+0x1f5/0x430 fs/namei.c:3824
do_sys_openat2+0x134/0x1d0 fs/open.c:1421
do_sys_open fs/open.c:1436 [inline]
__do_sys_openat fs/open.c:1452 [inline]
__se_sys_openat fs/open.c:1447 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1447
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1d514a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fffab718ba0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f1d51b67880 RCX: 00007f1d514a7407
RDX: 0000000000080000 RSI: 00007fffab718d20 RDI: ffffffffffffff9c
RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00005597f98f57f5
R13: 00005597f98f57f5 R14: 0000000000000001 R15: 00005597f9910140
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:loopback_jiffies_timer_pos_update+0x13c/0x1250 sound/drivers/aloop.c:619
Code: 77 3d f9 44 89 f8 83 e0 02 44 89 7c 24 3c 75 0a e8 79 73 3d f9 45 31 ff eb 27 e8 6f 73 3d f9 49 8d 5d 48 48 89 d8 48 c1 e8 03 <80> 3c 28 00 74 08 48 89 df e8 46 a2 95 f9 4d 89 f7 4c 2b 3b 4c 89
RSP: 0018:ffffc900001f0ac8 EFLAGS: 00010006
RAX: 0000000000000009 RBX: 0000000000000048 RCX: ffff8880287c0000
RDX: 0000000000000100 RSI: 0000000000000002 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003e148 R12: 0000000000000003
R13: 0000000000000000 R14: 00000000ffffed09 R15: 0000000000000003
FS: 00007f1d51b67880(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000032000 CR3: 000000002e9fa000 CR4: 00000000003506e0
----------------
Code disassembly (best guess):
0: 77 3d ja 0x3f
2: f9 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 73 3d f9 call 0xf93d738e
15: 45 31 ff xor %r15d,%r15d
18: eb 27 jmp 0x41
1a: e8 6f 73 3d f9 call 0xf93d738e
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 46 a2 95 f9 call 0xf995a27e
38: 4d 89 f7 mov %r14,%r15
3b: 4c 2b 3b sub (%rbx),%r15
3e: 4c rex.WR
3f: 89 .byte 0x89