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: 5169 Comm: udevd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:dummy_queue+0x1b7/0x870 drivers/usb/gadget/udc/dummy_hcd.c:712 Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 f2 4e 92 fe 4d 8b 24 24 49 83 c4 48 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 80 05 00 00 45 8b 24 24 44 89 e6 83 e6 02 RSP: 0018:ffffc90000007c50 EFLAGS: 00010206 RAX: 0000000000000009 RBX: ffff888108592e10 RCX: dffffc0000000000 RDX: ffff88811df5a780 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc90000007cc8 R08: ffff888130cf8173 R09: ffff888130cf8170 R10: dffffc0000000000 R11: ffffed102619f02f R12: 0000000000000048 R13: ffff888108592e00 R14: 1ffff110210b25c0 R15: ffff88810b858c90 FS: 00007fb31a052880(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb319eaa000 CR3: 000000011b22c000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000a110 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: usb_ep_queue+0xce/0x210 drivers/usb/gadget/udc/core.c:290 eth_start_xmit+0x811/0xd40 drivers/usb/gadget/function/u_ether.c:588 ncm_tx_timeout+0xec/0x160 drivers/usb/gadget/function/f_ncm.c:1171 __run_hrtimer kernel/time/hrtimer.c:1587 [inline] __hrtimer_run_queues+0x33a/0x7d0 kernel/time/hrtimer.c:1651 hrtimer_run_softirq+0x1ac/0x220 kernel/time/hrtimer.c:1668 __do_softirq+0x255/0x563 kernel/softirq.c:309 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:405 [inline] __irq_exit_rcu+0x128/0x150 kernel/softirq.c:435 irq_exit_rcu+0x9/0x10 kernel/softirq.c:447 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:blk_mq_update_dispatch_busy block/blk-mq.c:1238 [inline] RIP: 0010:__blk_mq_issue_directly block/blk-mq.c:-1 [inline] RIP: 0010:__blk_mq_try_issue_directly+0x399/0x750 block/blk-mq.c:2087 Code: f7 e8 9b 2c 6e ff 49 8b 1e 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 82 2c 6e ff 4c 89 ef 4c 89 fe ff 13 41 89 c6 <49> 81 c5 20 01 00 00 4d 89 ef 49 c1 ef 03 43 0f b6 04 27 84 c0 0f RSP: 0018:ffffc90000d67160 EFLAGS: 00000286 RAX: 0000000000000000 RBX: ffffffff854d3200 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000a02 RDI: 00000000ffffffff RBP: ffffc90000d67238 R08: ffffffff86c36eaf R09: 1ffffffff0d86dd5 R10: dffffc0000000000 R11: fffffbfff0d86dd6 R12: dffffc0000000000 R13: ffff8881096c8800 R14: 0000000000000000 R15: ffffc90000d671c0 blk_mq_request_issue_directly+0xc2/0x170 block/blk-mq.c:2135 blk_mq_try_issue_list_directly+0x164/0x490 block/blk-mq.c:2153 blk_mq_sched_insert_requests+0x1a2/0x350 block/blk-mq-sched.c:503 blk_mq_flush_plug_list+0x4e5/0x6b0 block/blk-mq.c:1992 blk_flush_plug_list+0x404/0x450 block/blk-core.c:1761 blk_finish_plug+0x5d/0x80 block/blk-core.c:1778 read_pages+0x92d/0xb50 mm/readahead.c:160 page_cache_ra_unbounded+0x638/0x790 mm/readahead.c:248 do_page_cache_ra mm/readahead.c:277 [inline] force_page_cache_ra+0x3a7/0x400 mm/readahead.c:308 page_cache_sync_ra+0x237/0x2a0 mm/readahead.c:582 page_cache_sync_readahead include/linux/pagemap.h:837 [inline] generic_file_buffered_read+0x570/0x26d0 mm/filemap.c:2250 generic_file_read_iter+0x10b/0x580 mm/filemap.c:2568 blkdev_read_iter+0x12f/0x160 fs/block_dev.c:1956 call_read_iter include/linux/fs.h:2060 [inline] new_sync_read fs/read_write.c:415 [inline] vfs_read+0x62a/0xa50 fs/read_write.c:496 ksys_read+0x14a/0x260 fs/read_write.c:634 __do_sys_read fs/read_write.c:644 [inline] __se_sys_read fs/read_write.c:642 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:642 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fb31a140407 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:00007ffc7ec9fea0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fb31a052880 RCX: 00007fb31a140407 RDX: 0000000000000200 RSI: 00007fb319ea9000 RDI: 0000000000000009 RBP: 000055d397064750 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000008000 R14: 000055d397068148 R15: 00007fb31a89639c Modules linked in: ---[ end trace 3dd5f97ac864ddfc ]--- RIP: 0010:dummy_queue+0x1b7/0x870 drivers/usb/gadget/udc/dummy_hcd.c:712 Code: fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 f2 4e 92 fe 4d 8b 24 24 49 83 c4 48 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 80 05 00 00 45 8b 24 24 44 89 e6 83 e6 02 RSP: 0018:ffffc90000007c50 EFLAGS: 00010206 RAX: 0000000000000009 RBX: ffff888108592e10 RCX: dffffc0000000000 RDX: ffff88811df5a780 RSI: 0000000000000003 RDI: 0000000000000005 RBP: ffffc90000007cc8 R08: ffff888130cf8173 R09: ffff888130cf8170 R10: dffffc0000000000 R11: ffffed102619f02f R12: 0000000000000048 R13: ffff888108592e00 R14: 1ffff110210b25c0 R15: ffff88810b858c90 FS: 00007fb31a052880(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb319eaa000 CR3: 000000011b22c000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000a110 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- 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 f2 4e 92 fe call 0xfe924f03 11: 4d 8b 24 24 mov (%r12),%r12 15: 49 83 c4 48 add $0x48,%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 80 05 00 00 jne 0x5b6 36: 45 8b 24 24 mov (%r12),%r12d 3a: 44 89 e6 mov %r12d,%esi 3d: 83 e6 02 and $0x2,%esi