Oops: general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f]
CPU: 1 UID: 0 PID: 5237 Comm: udevd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:snd_usbmidi_do_output+0x199/0x560 sound/usb/midi.c:310
Code: 5c 24 48 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 88 8b ec f8 48 8b 1b 4c 8d ab 88 00 00 00 4d 89 ef 49 c1 ef 03 <43> 0f b6 04 37 84 c0 0f 85 44 02 00 00 41 c7 45 00 00 00 00 00 48
RSP: 0018:ffffc90000a08ab8 EFLAGS: 00010006
RAX: 1ffff1100f9e9101 RBX: 0000000000000000 RCX: ffff88805e57da00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000141134 R12: 0000000000000001
R13: 0000000000000088 R14: dffffc0000000000 R15: 0000000000000011
FS: 00007f3bf7dd3880(0000) GS:ffff888125d13000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c008053000 CR3: 000000005dce2000 CR4: 00000000003526f0
Call Trace:
snd_usbmidi_error_timer+0x316/0x660 sound/usb/midi.c:362
call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__module_address+0x14/0x3e0 kernel/module/main.c:3815
Code: 33 ff ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 41 57 41 56 41 55 41 54 53 48 3b 3d 6c 60 36 0c <0f> 82 8a 02 00 00 48 3b 3d 67 60 36 0c 0f 87 7d 02 00 00 49 89 fd
RSP: 0018:ffffc90003bbf0f0 EFLAGS: 00000213
RAX: 0000000000000001 RBX: ffffffff81aab64d RCX: adda5dd218824800
RDX: 0000000000000000 RSI: ffffffff8be33f60 RDI: 00007f3bf76a7407
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff81aab64d
R10: ffffc90003bbf1f8 R11: ffffffff81ac3b00 R12: ffff88805e57da00
R13: ffff888024a9a000 R14: 00007f3bf76a7407 R15: 1ffff92000777e3e
__module_text_address kernel/module/main.c:3871 [inline]
is_module_text_address+0x88/0x1e0 kernel/module/main.c:3846
kernel_text_address+0x94/0xe0 kernel/extable.c:119
__kernel_text_address+0xd/0x40 kernel/extable.c:79
unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4376 [inline]
__kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4388
kmalloc_noprof include/linux/slab.h:909 [inline]
tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_check_open_permission+0x1c1/0x3b0 security/tomoyo/file.c:771
security_file_open+0xb1/0x270 security/security.c:3144
do_dentry_open+0x384/0x13f0 fs/open.c:942
vfs_open+0x3b/0x340 fs/open.c:1095
do_open fs/namei.c:3887 [inline]
path_openat+0x2ee5/0x3830 fs/namei.c:4046
do_filp_open+0x1fa/0x410 fs/namei.c:4073
do_sys_openat2+0x121/0x1c0 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_openat fs/open.c:1466 [inline]
__se_sys_openat fs/open.c:1461 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1461
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3bf76a7407
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:00007ffe8bad7b50 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f3bf7dd3880 RCX: 00007f3bf76a7407
RDX: 0000000000080141 RSI: 000055626d58002e RDI: ffffffffffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000001a4 R11: 0000000000000202 R12: 00000000ffffffff
R13: 00000000ffffffff R14: ffffffffffffffff R15: 0000000000000000
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:snd_usbmidi_do_output+0x199/0x560 sound/usb/midi.c:310
Code: 5c 24 48 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 88 8b ec f8 48 8b 1b 4c 8d ab 88 00 00 00 4d 89 ef 49 c1 ef 03 <43> 0f b6 04 37 84 c0 0f 85 44 02 00 00 41 c7 45 00 00 00 00 00 48
RSP: 0018:ffffc90000a08ab8 EFLAGS: 00010006
RAX: 1ffff1100f9e9101 RBX: 0000000000000000 RCX: ffff88805e57da00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000141134 R12: 0000000000000001
R13: 0000000000000088 R14: dffffc0000000000 R15: 0000000000000011
FS: 00007f3bf7dd3880(0000) GS:ffff888125d13000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c008053000 CR3: 000000005dce2000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 5c pop %rsp
1: 24 48 and $0x48,%al
3: 48 89 d8 mov %rbx,%rax
6: 48 c1 e8 03 shr $0x3,%rax
a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1)
f: 74 08 je 0x19
11: 48 89 df mov %rbx,%rdi
14: e8 88 8b ec f8 call 0xf8ec8ba1
19: 48 8b 1b mov (%rbx),%rbx
1c: 4c 8d ab 88 00 00 00 lea 0x88(%rbx),%r13
23: 4d 89 ef mov %r13,%r15
26: 49 c1 ef 03 shr $0x3,%r15
* 2a: 43 0f b6 04 37 movzbl (%r15,%r14,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 44 02 00 00 jne 0x27b
37: 41 c7 45 00 00 00 00 movl $0x0,0x0(%r13)
3e: 00
3f: 48 rex.W