Hello, syzbot found the following issue on: HEAD commit: 1b29d271614a Merge tag 'staging-6.4-rc7' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11028640a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=ac246111fb601aec dashboard link: https://syzkaller.appspot.com/bug?extid=6062afbf92a14f75d88b compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=150a0f73280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=107fcaff280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/16519d7a3fc8/disk-1b29d271.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d2cd6e97f1df/vmlinux-1b29d271.xz kernel image: https://storage.googleapis.com/syzbot-assets/a7781abe10c9/bzImage-1b29d271.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/5b429fa9e0f3/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6062afbf92a14f75d88b@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0011ad8e6f: 0000 [#1] PREEMPT SMP KASAN KASAN: probably user-memory-access in range [0x000000008d6c7378-0x000000008d6c737f] CPU: 0 PID: 4991 Comm: syz-executor335 Not tainted 6.4.0-rc6-syzkaller-00269-g1b29d271614a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 RIP: 0010:dev_hard_header include/linux/netdevice.h:3137 [inline] RIP: 0010:lapbeth_data_transmit+0x245/0x360 drivers/net/wan/lapbether.c:257 Code: 74 08 3c 01 0f 8e 97 00 00 00 49 8d bc 24 38 02 00 00 66 89 9d b8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c6 00 00 00 49 8b 9c 24 38 02 00 00 48 85 db 74 RSP: 0018:ffffc90000007c20 EFLAGS: 00010216 RAX: dffffc0000000000 RBX: 0000000000000012 RCX: 0000000000000003 RDX: 0000000011ad8e6f RSI: ffffffff8807bdbb RDI: 000000008d6c7378 RBP: ffff8880223bddc0 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000094001 R12: 000000008d6c7140 R13: 0000000000000000 R14: ffff888023302a14 R15: 0000000000000000 FS: 00005555563323c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055727dd5a800 CR3: 000000002921e000 CR4: 0000000000350ef0 Call Trace: <IRQ> lapb_data_transmit+0x93/0xc0 net/lapb/lapb_iface.c:447 lapb_transmit_buffer+0x187/0x3a0 net/lapb/lapb_out.c:149 lapb_send_control+0x1cb/0x370 net/lapb/lapb_subr.c:251 lapb_t1timer_expiry+0x5e0/0x8f0 net/lapb/lapb_timer.c:142 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700 expire_timers+0x29b/0x4b0 kernel/time/timer.c:1751 __run_timers kernel/time/timer.c:2022 [inline] __run_timers kernel/time/timer.c:1995 [inline] run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035 __do_softirq+0x1d4/0x905 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1106 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:memmove+0x4f/0x1b0 arch/x86/lib/memmove_64.S:69 Code: 0f 1f 44 00 00 48 81 fa a8 02 00 00 72 05 40 38 fe 74 48 48 83 ea 20 48 83 ea 20 4c 8b 1e 4c 8b 56 08 4c 8b 4e 10 4c 8b 46 18 <48> 8d 76 20 4c 89 1f 4c 89 57 08 4c 89 4f 10 4c 89 47 18 48 8d 7f RSP: 0018:ffffc90003abefb0 EFLAGS: 00000286 RAX: ffff888073551fb4 RBX: 0000000000000002 RCX: 1ffff1100e6aa201 RDX: fffffffff9171f60 RSI: ffff88807a3dffe4 RDI: ffff88807a3dfff4 RBP: 0000000000000020 R08: 7a3e0c8000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffff888073551fa4 R15: 0000000000000010 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dev_hard_header include/linux/netdevice.h:3137 [inline] RIP: 0010:lapbeth_data_transmit+0x245/0x360 drivers/net/wan/lapbether.c:257 Code: 74 08 3c 01 0f 8e 97 00 00 00 49 8d bc 24 38 02 00 00 66 89 9d b8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c6 00 00 00 49 8b 9c 24 38 02 00 00 48 85 db 74 RSP: 0018:ffffc90000007c20 EFLAGS: 00010216 RAX: dffffc0000000000 RBX: 0000000000000012 RCX: 0000000000000003 RDX: 0000000011ad8e6f RSI: ffffffff8807bdbb RDI: 000000008d6c7378 RBP: ffff8880223bddc0 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000094001 R12: 000000008d6c7140 R13: 0000000000000000 R14: ffff888023302a14 R15: 0000000000000000 FS: 00005555563323c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055727dd5a800 CR3: 000000002921e000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 74 08 je 0xa 2: 3c 01 cmp $0x1,%al 4: 0f 8e 97 00 00 00 jle 0xa1 a: 49 8d bc 24 38 02 00 lea 0x238(%r12),%rdi 11: 00 12: 66 89 9d b8 00 00 00 mov %bx,0xb8(%rbp) 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 c6 00 00 00 jne 0xfa 34: 49 8b 9c 24 38 02 00 mov 0x238(%r12),%rbx 3b: 00 3c: 48 85 db test %rbx,%rbx 3f: 74 .byte 0x74 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
