netdevsim netdevsim2 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000012: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097] CPU: 0 UID: 0 PID: 25236 Comm: syz-executor Not tainted 6.12.0-rc1-syzkaller-00349-g8f602276d390 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__fib6_drop_pcpu_from+0x1fd/0x3d0 net/ipv6/ip6_fib.c:987 Code: 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 ef e8 fa 1c 97 f7 48 8b 6d 00 48 85 ed 74 30 48 81 c5 90 00 00 00 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 ef e8 d4 1c 97 f7 48 8b 45 00 4c 39 f0 RSP: 0018:ffffc900041e6b00 EFLAGS: 00010206 RAX: 0000000000000012 RBX: ffffffff8e307a58 RCX: ffff88801efa3c00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000091 R08: ffffffff8a644718 R09: 1ffffffff2852100 R10: dffffc0000000000 R11: fffffbfff2852101 R12: dffffc0000000000 R13: ffff888063d16510 R14: ffff888063d16400 R15: 0000000000000001 FS: 00005555677dd500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fba4bc635c0 CR3: 000000007de62000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fib6_drop_pcpu_from net/ipv6/ip6_fib.c:1031 [inline] fib6_purge_rt+0x193/0x890 net/ipv6/ip6_fib.c:1042 fib6_del_route net/ipv6/ip6_fib.c:2002 [inline] fib6_del+0xe77/0x1610 net/ipv6/ip6_fib.c:2047 fib6_clean_node+0x2f7/0x5e0 net/ipv6/ip6_fib.c:2209 fib6_walk_continue+0x658/0x8f0 net/ipv6/ip6_fib.c:2131 fib6_walk+0x168/0x2b0 net/ipv6/ip6_fib.c:2179 fib6_clean_tree net/ipv6/ip6_fib.c:2259 [inline] __fib6_clean_all+0x31f/0x4b0 net/ipv6/ip6_fib.c:2275 rt6_sync_down_dev net/ipv6/route.c:4908 [inline] rt6_disable_ip+0x170/0x800 net/ipv6/route.c:4913 addrconf_ifdown+0x15d/0x1bd0 net/ipv6/addrconf.c:3858 addrconf_notify+0x3cb/0x1020 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] dev_close_many+0x33c/0x4c0 net/core/dev.c:1589 unregister_netdevice_many_notify+0x530/0x1da0 net/core/dev.c:11377 unregister_netdevice_many net/core/dev.c:11465 [inline] unregister_netdevice_queue+0x303/0x370 net/core/dev.c:11339 unregister_netdevice include/linux/netdevice.h:3118 [inline] nsim_destroy+0x180/0x5c0 drivers/net/netdevsim/netdev.c:778 __nsim_dev_port_del+0x14b/0x1b0 drivers/net/netdevsim/dev.c:1425 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1437 [inline] nsim_dev_reload_destroy+0x28a/0x490 drivers/net/netdevsim/dev.c:1658 nsim_drv_remove+0x58/0x160 drivers/net/netdevsim/dev.c:1673 device_remove drivers/base/dd.c:567 [inline] __device_release_driver drivers/base/dd.c:1273 [inline] device_release_driver_internal+0x4a9/0x7c0 drivers/base/dd.c:1296 bus_remove_device+0x34f/0x420 drivers/base/bus.c:576 device_del+0x57a/0x9b0 drivers/base/core.c:3864 device_unregister+0x20/0xc0 drivers/base/core.c:3905 nsim_bus_dev_del drivers/net/netdevsim/bus.c:462 [inline] del_device_store+0x363/0x480 drivers/net/netdevsim/bus.c:226 kernfs_fop_write_iter+0x3a0/0x500 fs/kernfs/file.c:334 new_sync_write fs/read_write.c:590 [inline] vfs_write+0xa6d/0xc90 fs/read_write.c:683 ksys_write+0x183/0x2b0 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffa6797cadf Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 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 1c 8e 02 00 48 RSP: 002b:00007ffc18769390 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007ffa6797cadf RDX: 0000000000000001 RSI: 00007ffc187693e0 RDI: 0000000000000005 RBP: 00007ffa679f13ae R08: 0000000000000000 R09: 00007ffc187691e7 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 00007ffc187693e0 R14: 00007ffa68664620 R15: 0000000000000003 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__fib6_drop_pcpu_from+0x1fd/0x3d0 net/ipv6/ip6_fib.c:987 Code: 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 ef e8 fa 1c 97 f7 48 8b 6d 00 48 85 ed 74 30 48 81 c5 90 00 00 00 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 ef e8 d4 1c 97 f7 48 8b 45 00 4c 39 f0 RSP: 0018:ffffc900041e6b00 EFLAGS: 00010206 RAX: 0000000000000012 RBX: ffffffff8e307a58 RCX: ffff88801efa3c00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000091 R08: ffffffff8a644718 R09: 1ffffffff2852100 R10: dffffc0000000000 R11: fffffbfff2852101 R12: dffffc0000000000 R13: ffff888063d16510 R14: ffff888063d16400 R15: 0000000000000001 FS: 00005555677dd500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fba4bc635c0 CR3: 000000007de62000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 c1 e8 03 shr $0x3,%rax 4: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 9: 74 08 je 0x13 b: 48 89 ef mov %rbp,%rdi e: e8 fa 1c 97 f7 call 0xf7971d0d 13: 48 8b 6d 00 mov 0x0(%rbp),%rbp 17: 48 85 ed test %rbp,%rbp 1a: 74 30 je 0x4c 1c: 48 81 c5 90 00 00 00 add $0x90,%rbp 23: 48 89 e8 mov %rbp,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 ef mov %rbp,%rdi 34: e8 d4 1c 97 f7 call 0xf7971d0d 39: 48 8b 45 00 mov 0x0(%rbp),%rax 3d: 4c 39 f0 cmp %r14,%rax