Oops: general protection fault, probably for non-canonical address 0xdffffc00000000e6: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000730-0x0000000000000737]
CPU: 1 UID: 0 PID: 11880 Comm: syz.2.1522 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:f_midi2_free_ep_reqs+0x56/0x2b0 drivers/usb/gadget/function/f_midi2.c:1166
Code: 85 6a 02 00 00 49 8b 45 00 48 89 44 24 18 48 05 30 07 00 00 48 89 c2 48 89 44 24 20 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e b5 01 00 00 48 8b 44 24 18 31
RSP: 0018:ffffc90000a089e8 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffff8880574ac000 RCX: ffffffff87e7a829
RDX: 00000000000000e6 RSI: ffffffff87e7a666 RDI: ffff8880574ac128
RBP: ffff8880574ac128 R08: 0000000000000004 R09: 0000000000000020
R10: 0000000000000020 R11: 0000000000000000 R12: ffff8880574ac0f0
R13: ffff8880574ac128 R14: ffff8880574ac740 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888123edc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002b000 CR3: 000000005e8a8000 CR4: 00000000003526f0
Call Trace:
f_midi2_stop_eps drivers/usb/gadget/function/f_midi2.c:1246 [inline]
f_midi2_set_alt+0x444/0x5f0 drivers/usb/gadget/function/f_midi2.c:1296
composite_setup+0x16f8/0x9290 drivers/usb/gadget/composite.c:1933
configfs_composite_setup+0xfb/0x130 drivers/usb/gadget/configfs.c:1877
dummy_timer+0x2045/0x36f0 drivers/usb/gadget/udc/dummy_hcd.c:1951
__run_hrtimer kernel/time/hrtimer.c:2032 [inline]
__hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096
hrtimer_run_softirq+0x17d/0x2c0 kernel/time/hrtimer.c:2113
handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x162/0x210 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0x58b/0x2090 arch/x86/kernel/unwind_orc.c:530
Code: 00 fc ff df 48 c1 ea 03 0f b6 04 02 4c 89 f2 41 c0 ef 03 83 e2 07 41 83 e7 01 38 d0 7f 08 84 c0 0f 85 d6 14 00 00 45 88 7d 35 <44> 0f b6 71 04 41 83 e6 0f 41 80 fe 05 0f 84 76 0d 00 00 0f 87 f3
RSP: 0018:ffffc9001061eef0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff91c98a1c
RDX: 0000000000000005 RSI: 0000000000000001 RDI: ffffffff913ec724
RBP: ffffc9001061efa8 R08: ffffffff91c98a20 R09: 0000000000000007
R10: 0000000000000200 R11: 000000000000f471 R12: ffffc9001061efb0
R13: ffffc9001061ef60 R14: ffffc9001061ef95 R15: 0000000000000000
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x162/0x1e0 mm/page_owner.c:165
__reset_page_owner+0x84/0x190 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1406 [inline]
free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
folios_put_refs+0x585/0xaa0 mm/swap.c:1057
folio_batch_release include/linux/folio_batch.h:101 [inline]
shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1159
shmem_truncate_range mm/shmem.c:1287 [inline]
shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1417
evict+0x3c2/0xad0 fs/inode.c:825
iput_final fs/inode.c:2019 [inline]
iput.part.0+0x989/0x1050 fs/inode.c:2068
iput+0x35/0x40 fs/inode.c:2034
dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
dentry_kill+0x25d/0xc20 fs/dcache.c:826
finish_dput fs/dcache.c:1001 [inline]
dput.part.0+0xd7/0x240 fs/dcache.c:1042
dput+0x1f/0x30 fs/dcache.c:1037
__fput+0x519/0xb50 fs/file_table.c:520
task_work_run+0x150/0x240 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x951/0x2ae0 kernel/exit.c:1009
do_group_exit+0xd5/0x2a0 kernel/exit.c:1152
get_signal+0x1ec7/0x21e0 kernel/signal.c:3046
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f54e219de99
Code: Unable to access opcode bytes at 0x7f54e219de6f.
RSP: 002b:00007f54e311a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: 000000000000000b RBX: 00007f54e2426090 RCX: 00007f54e219de99
RDX: 0000000000000651 RSI: 0000200000000000 RDI: 0000000000000009
RBP: 00007f54e2233eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f54e2426128 R14: 00007f54e2426090 R15: 00007fff7c274c48
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:f_midi2_free_ep_reqs+0x56/0x2b0 drivers/usb/gadget/function/f_midi2.c:1166
Code: 85 6a 02 00 00 49 8b 45 00 48 89 44 24 18 48 05 30 07 00 00 48 89 c2 48 89 44 24 20 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e b5 01 00 00 48 8b 44 24 18 31
RSP: 0018:ffffc90000a089e8 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: ffff8880574ac000 RCX: ffffffff87e7a829
RDX: 00000000000000e6 RSI: ffffffff87e7a666 RDI: ffff8880574ac128
RBP: ffff8880574ac128 R08: 0000000000000004 R09: 0000000000000020
R10: 0000000000000020 R11: 0000000000000000 R12: ffff8880574ac0f0
R13: ffff8880574ac128 R14: ffff8880574ac740 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888123edc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002b000 CR3: 000000005e8a8000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 85 6a 02 test %ebp,0x2(%rdx)
3: 00 00 add %al,(%rax)
5: 49 8b 45 00 mov 0x0(%r13),%rax
9: 48 89 44 24 18 mov %rax,0x18(%rsp)
e: 48 05 30 07 00 00 add $0x730,%rax
14: 48 89 c2 mov %rax,%rdx
17: 48 89 44 24 20 mov %rax,0x20(%rsp)
1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
23: fc ff df
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 74 08 je 0x3a
32: 3c 03 cmp $0x3,%al
34: 0f 8e b5 01 00 00 jle 0x1ef
3a: 48 8b 44 24 18 mov 0x18(%rsp),%rax
3f: 31 .byte 0x31