RSP: 002b:00000000f54b650c EFLAGS: 00000206 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000008931 RDX: 00000000800002c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ------------[ cut here ]------------ netdevice: dummy0: failed to sync uc/mc addresses WARNING: net/core/dev_addr_lists.c:1278 at netif_rx_mode_run+0xd55/0x1290 net/core/dev_addr_lists.c:1278, CPU#0: syz.3.6103/29187 Modules linked in: CPU: 0 UID: 0 PID: 29187 Comm: syz.3.6103 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:netif_rx_mode_run+0xe82/0x1290 net/core/dev_addr_lists.c:1278 Code: 3a 48 c7 c2 20 e0 dd 8c eb 1a e8 e9 94 45 f8 48 c7 c2 a0 de dd 8c eb 0c e8 db 94 45 f8 48 c7 c2 a0 df dd 8c 4c 89 f7 4c 89 fe <67> 48 0f b9 3a 48 8b 5c 24 38 48 8b 7c 24 48 e8 2a 00 2a 02 42 c7 RSP: 0000:ffffc9001084f820 EFLAGS: 00010293 RAX: ffffffff898021c7 RBX: 0000000000000001 RCX: ffff88807cfb3e00 RDX: ffffffff8cdddea0 RSI: ffff8880778d8120 RDI: ffffffff903f2460 RBP: ffffc9001084f9f8 R08: ffff88807cfb3e00 R09: 0000000000000006 R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880778d8120 R13: dffffc0000000000 R14: ffffffff903f2460 R15: ffff8880778d8120 FS: 0000000000000000(0000) GS:ffff8881252a0000(0063) knlGS:00000000f54b6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000080052018 CR3: 0000000060f00000 CR4: 00000000003526f0 Call Trace: netif_rx_mode_sync+0x171/0x1e0 net/core/dev_addr_lists.c:1428 dev_ifsioc+0xf51/0x1330 net/core/dev_ioctl.c:596 dev_ioctl+0x7b4/0x1150 net/core/dev_ioctl.c:816 sock_do_ioctl+0x23e/0x320 net/socket.c:1327 compat_sock_ioctl_trans net/socket.c:3613 [inline] compat_sock_ioctl+0xba6/0xcb0 net/socket.c:3639 __do_compat_sys_ioctl fs/ioctl.c:695 [inline] __se_compat_sys_ioctl fs/ioctl.c:638 [inline] __ia32_compat_sys_ioctl+0x5ea/0x950 fs/ioctl.c:638 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x23e/0x6f0 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7ff301c Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8 RSP: 002b:00000000f54b650c EFLAGS: 00000206 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000008931 RDX: 00000000800002c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 3a 48 c7 cmp -0x39(%rax),%cl 3: c2 20 e0 ret $0xe020 6: dd 8c eb 1a e8 e9 94 fisttpll -0x6b1617e6(%rbx,%rbp,8) d: 45 f8 rex.RB clc f: 48 c7 c2 a0 de dd 8c mov $0xffffffff8cdddea0,%rdx 16: eb 0c jmp 0x24 18: e8 db 94 45 f8 call 0xf84594f8 1d: 48 c7 c2 a0 df dd 8c mov $0xffffffff8cdddfa0,%rdx 24: 4c 89 f7 mov %r14,%rdi 27: 4c 89 fe mov %r15,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 48 8b 5c 24 38 mov 0x38(%rsp),%rbx 34: 48 8b 7c 24 48 mov 0x48(%rsp),%rdi 39: e8 2a 00 2a 02 call 0x22a0068 3e: 42 rex.X 3f: c7 .byte 0xc7