Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe000: 0000 [#1] SMP KASAN PTI KASAN: probably user-memory-access in range [0x00000000ffff0000-0x00000000ffff0007] CPU: 1 UID: 0 PID: 25854 Comm: syz-executor Not tainted 6.17.0-rc1-syzkaller-00127-g715c7a36d59f #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:mld_clear_delrec+0x3a5/0x660 net/ipv6/mcast.c:840 Code: ff ff ff e8 9d 2c 41 01 89 c5 31 ff 89 c6 e8 72 81 87 f7 85 ed 74 40 e8 29 7d 87 f7 eb 05 e8 22 7d 87 f7 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 5c e6 ea f7 4d 8b 27 49 8d 7f 30 RSP: 0018:ffffc9000ec4f390 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: ffff8880705d8538 RCX: ffff88803391da00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa37e37 R09: 1ffffffff1f46fc6 R10: dffffc0000000000 R11: fffffbfff1f46fc7 R12: ffff888021748828 R13: dffffc0000000000 R14: ffff888021748800 R15: 00000000ffff0000 FS: 00005555647e0500(0000) GS:ffff888125d1c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2e422950a0 CR3: 000000005374e000 CR4: 00000000003526f0 Call Trace: ipv6_mc_destroy_dev+0x45/0x5a0 net/ipv6/mcast.c:2839 addrconf_ifdown+0x139e/0x1880 net/ipv6/addrconf.c:3996 addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline] call_netdevice_notifiers net/core/dev.c:2281 [inline] unregister_netdevice_many_notify+0x14d7/0x1ff0 net/core/dev.c:12154 unregister_netdevice_many net/core/dev.c:12217 [inline] unregister_netdevice_queue+0x33c/0x380 net/core/dev.c:12061 unregister_netdevice include/linux/netdevice.h:3385 [inline] nsim_destroy+0x1dd/0x670 drivers/net/netdevsim/netdev.c:1140 __nsim_dev_port_del+0x14d/0x1b0 drivers/net/netdevsim/dev.c:1473 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1485 [inline] nsim_dev_reload_destroy+0x288/0x490 drivers/net/netdevsim/dev.c:1707 nsim_drv_remove+0x58/0x160 drivers/net/netdevsim/dev.c:1722 device_remove drivers/base/dd.c:569 [inline] __device_release_driver drivers/base/dd.c:1274 [inline] device_release_driver_internal+0x46c/0x800 drivers/base/dd.c:1297 bus_remove_device+0x34d/0x410 drivers/base/bus.c:579 device_del+0x511/0x8e0 drivers/base/core.c:3878 device_unregister+0x20/0xc0 drivers/base/core.c:3919 nsim_bus_dev_del drivers/net/netdevsim/bus.c:483 [inline] del_device_store+0x2aa/0x360 drivers/net/netdevsim/bus.c:244 kernfs_fop_write_iter+0x378/0x4f0 fs/kernfs/file.c:334 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c6/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6e7cb8d69f Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48 RSP: 002b:00007fff720262b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f6e7cb8d69f RDX: 0000000000000001 RSI: 00007fff72026300 RDI: 0000000000000005 RBP: 00007f6e7cc130c1 R08: 0000000000000000 R09: 00007fff72026107 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 00007fff72026300 R14: 00007f6e7d8e4620 R15: 0000000000000003 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mld_clear_delrec+0x3a5/0x660 net/ipv6/mcast.c:840 Code: ff ff ff e8 9d 2c 41 01 89 c5 31 ff 89 c6 e8 72 81 87 f7 85 ed 74 40 e8 29 7d 87 f7 eb 05 e8 22 7d 87 f7 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 5c e6 ea f7 4d 8b 27 49 8d 7f 30 RSP: 0018:ffffc9000ec4f390 EFLAGS: 00010206 RAX: 000000001fffe000 RBX: ffff8880705d8538 RCX: ffff88803391da00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8fa37e37 R09: 1ffffffff1f46fc6 R10: dffffc0000000000 R11: fffffbfff1f46fc7 R12: ffff888021748828 R13: dffffc0000000000 R14: ffff888021748800 R15: 00000000ffff0000 FS: 00005555647e0500(0000) GS:ffff888125d1c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000000 CR3: 000000005374e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: e8 9d 2c 41 01 call 0x1412ca2 5: 89 c5 mov %eax,%ebp 7: 31 ff xor %edi,%edi 9: 89 c6 mov %eax,%esi b: e8 72 81 87 f7 call 0xf7878182 10: 85 ed test %ebp,%ebp 12: 74 40 je 0x54 14: e8 29 7d 87 f7 call 0xf7877d42 19: eb 05 jmp 0x20 1b: e8 22 7d 87 f7 call 0xf7877d42 20: 4c 89 f8 mov %r15,%rax 23: 48 c1 e8 03 shr $0x3,%rax * 27: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2c: 74 08 je 0x36 2e: 4c 89 ff mov %r15,%rdi 31: e8 5c e6 ea f7 call 0xf7eae692 36: 4d 8b 27 mov (%r15),%r12 39: 49 8d 7f 30 lea 0x30(%r15),%rdi