Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
CPU: 0 UID: 0 PID: 297 Comm: syz-executor Not tainted syzkaller #0 3c3170d5147e1ade2ce3347a3db15f56e1abada8
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:dummy_queue+0x1c0/0x8e0 drivers/usb/gadget/udc/dummy_hcd.c:717
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 29 82 26 fe 4d 8b 24 24 49 83 c4 50 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 f5 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc90000007bf8 EFLAGS: 00010206
RAX: 000000000000000a RBX: ffff88811455c210 RCX: dffffc0000000000
RDX: ffff8881226f2600 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90000007c70 R08: ffff888103f10173 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff83b9b260 R12: 0000000000000050
R13: ffff88811455c200 R14: 1ffff110228ab840 R15: ffff8881053d8c90
FS: 0000555572577500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3680b556c8 CR3: 000000012050c000 CR4: 00000000003526b0
Call Trace:
usb_ep_queue+0xe3/0x230 drivers/usb/gadget/udc/core.c:305
eth_start_xmit+0x9c1/0xf90 drivers/usb/gadget/function/u_ether.c:578
ncm_tx_timeout+0x99/0xc0 drivers/usb/gadget/function/f_ncm.c:1160
__run_hrtimer kernel/time/hrtimer.c:1757 [inline]
__hrtimer_run_queues+0x3ae/0x8e0 kernel/time/hrtimer.c:1821
hrtimer_run_softirq+0x159/0x560 kernel/time/hrtimer.c:1838
handle_softirqs+0x1aa/0x620 kernel/softirq.c:621
__do_softirq kernel/softirq.c:659 [inline]
invoke_softirq kernel/softirq.c:476 [inline]
__irq_exit_rcu+0x47/0xb0 kernel/softirq.c:708
irq_exit_rcu+0xd/0x30 kernel/softirq.c:720
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x82/0x90 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4e/0x70 kernel/locking/spinlock.c:202
Code: 48 89 fb 48 c7 c7 c0 8f 4e 87 e8 fd b4 39 fc 48 89 df 48 83 3d 82 0e a8 01 00 74 1f e8 5b 0d 00 00 90 fb 65 ff 0d 7a 6a 5e 7a <74> 08 5b 5d e9 89 3d 00 00 cc e8 b3 7a 63 fb eb f1 0f 0b 66 2e 0f
RSP: 0018:ffffc9000b64f608 EFLAGS: 00000282
RAX: 0000000000000001 RBX: ffffea0004cc4a40 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff888121483258
RBP: ffffc9000b64f610 R08: ffff888111092b7f R09: 1ffff1102221256f
R10: dffffc0000000000 R11: ffffed1022212570 R12: ffff888121483258
R13: 1ffff1102429064a R14: ffff888121483250 R15: ffffc9000b64f660
spin_unlock_irq include/linux/spinlock.h:401 [inline]
filemap_remove_folio+0x112/0x490 mm/filemap.c:293
truncate_inode_folio+0x61/0x80 mm/truncate.c:182
shmem_undo_range+0x3e9/0x1400 mm/shmem.c:1075
shmem_truncate_range mm/shmem.c:1208 [inline]
shmem_evict_inode+0x286/0xaa0 mm/shmem.c:1336
evict+0x51c/0xaf0 fs/inode.c:731
iput_final fs/inode.c:1890 [inline]
iput+0x651/0x910 fs/inode.c:1916
do_unlinkat+0x3d2/0x5a0 fs/namei.c:4548
__do_sys_unlink fs/namei.c:4589 [inline]
__se_sys_unlink fs/namei.c:4587 [inline]
__x64_sys_unlink+0x4b/0x60 fs/namei.c:4587
x64_sys_call+0x286c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:88
do_syscall_x64 arch/x86/entry/common.c:47 [inline]
do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f566199d1c7
Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc27f09dc8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f566199d1c7
RDX: 00007ffc27f09df0 RSI: 00007ffc27f09e80 RDI: 00007ffc27f09e80
RBP: 00007ffc27f09e80 R08: 00007ffc27f0ae80 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffc27f0af10
R13: 00007f5661a34474 R14: 0000000000009b80 R15: 00007ffc27f0af50
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dummy_queue+0x1c0/0x8e0 drivers/usb/gadget/udc/dummy_hcd.c:717
Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 29 82 26 fe 4d 8b 24 24 49 83 c4 50 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 f5 05 00 00 45 8b 24 24 44 89 e6 83 e6 02
RSP: 0018:ffffc90000007bf8 EFLAGS: 00010206
RAX: 000000000000000a RBX: ffff88811455c210 RCX: dffffc0000000000
RDX: ffff8881226f2600 RSI: 0000000000000003 RDI: 0000000000000005
RBP: ffffc90000007c70 R08: ffff888103f10173 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff83b9b260 R12: 0000000000000050
R13: ffff88811455c200 R14: 1ffff110228ab840 R15: ffff8881053d8c90
FS: 0000555572577500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3680b556c8 CR3: 000000012050c000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
0: fc cld
1: ff lcall (bad)
2: df 80 3c 08 00 74 filds 0x7400083c(%rax)
8: 08 4c 89 e7 or %cl,-0x19(%rcx,%rcx,4)
c: e8 29 82 26 fe call 0xfe26823a
11: 4d 8b 24 24 mov (%r12),%r12
15: 49 83 c4 50 add $0x50,%r12
19: 4c 89 e0 mov %r12,%rax
1c: 48 c1 e8 03 shr $0x3,%rax
20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
27: fc ff df
* 2a: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 0f 85 f5 05 00 00 jne 0x62b
36: 45 8b 24 24 mov (%r12),%r12d
3a: 44 89 e6 mov %r12d,%esi
3d: 83 e6 02 and $0x2,%esi