Oops: general protection fault, probably for non-canonical address 0xdffffc000000004b: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000258-0x000000000000025f] CPU: 1 UID: 0 PID: 15723 Comm: syz.2.2721 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:199 Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 e9 8e 58 75 09 66 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffffc9001a64f708 EFLAGS: 00010286 RAX: dffffc0000000000 RBX: 0000000000000258 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff89656f21 RDI: dffffc000000004b RBP: 0000000000000258 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff89656f21 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fe6ab5da6c0(0000) GS:ffff8881247b5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002581d000 CR4: 00000000003526f0 DR0: 0000000000000004 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __kasan_check_byte+0x13/0x50 mm/kasan/common.c:567 kasan_check_byte include/linux/kasan.h:399 [inline] lock_acquire kernel/locking/lockdep.c:5842 [inline] lock_acquire+0xfc/0x350 kernel/locking/lockdep.c:5825 lock_sock_nested+0x41/0xf0 net/core/sock.c:3711 lock_sock include/net/sock.h:1669 [inline] rose_kill_by_device+0x1f3/0x790 net/rose/af_rose.c:210 rose_device_event+0xe2/0x120 net/rose/af_rose.c:244 notifier_call_chain+0xb9/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2229 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline] call_netdevice_notifiers net/core/dev.c:2281 [inline] __dev_notify_flags+0x1f7/0x2e0 net/core/dev.c:9590 netif_change_flags+0x108/0x160 net/core/dev.c:9617 dev_change_flags+0xba/0x250 net/core/dev_api.c:68 dev_ifsioc+0x1498/0x1f70 net/core/dev_ioctl.c:565 dev_ioctl+0x223/0x10e0 net/core/dev_ioctl.c:824 sock_do_ioctl+0x19d/0x280 net/socket.c:1252 sock_ioctl+0x227/0x6b0 net/socket.c:1359 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe6aa78ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe6ab5da038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe6aa9c5fa0 RCX: 00007fe6aa78ebe9 RDX: 0000200000000300 RSI: 0000000000008914 RDI: 0000000000000006 RBP: 00007fe6aa811e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe6aa9c6038 R14: 00007fe6aa9c5fa0 R15: 00007ffeb15a0f38 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:199 Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 e9 8e 58 75 09 66 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffffc9001a64f708 EFLAGS: 00010286 RAX: dffffc0000000000 RBX: 0000000000000258 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff89656f21 RDI: dffffc000000004b RBP: 0000000000000258 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff89656f21 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fe6ab5da6c0(0000) GS:ffff8881246b5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2a3b3f CR3: 000000002581d000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 0f 1f 00 nopl (%rax) 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 66 0f 1f 00 nopw (%rax) 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 c1 ef 03 shr $0x3,%rdi 27: 48 01 c7 add %rax,%rdi * 2a: 0f b6 07 movzbl (%rdi),%eax <-- trapping instruction 2d: 3c 07 cmp $0x7,%al 2f: 0f 96 c0 setbe %al 32: e9 8e 58 75 09 jmp 0x97558c5 37: 66 data16 38: 66 data16 39: 2e cs 3a: 0f .byte 0xf 3b: 1f (bad) 3c: 84 00 test %al,(%rax)