cgroup: fork rejected by pids controller in /syz5 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 19403 Comm: syz-executor0 Not tainted 4.20.0+ #13 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:fib6_drop_pcpu_from net/ipv6/ip6_fib.c:924 [inline] RIP: 0010:fib6_purge_rt+0x5c9/0x7f0 net/ipv6/ip6_fib.c:960 Code: 0f b6 3d d9 78 86 03 31 ff 44 89 fe e8 20 72 b0 fa 45 84 ff 0f 84 e3 00 00 00 e8 d2 70 b0 fa 49 8d 7e 70 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 b8 01 00 00 48 8d 45 98 4d 8b 7e 70 48 89 c2 48 RSP: 0018:ffff888057bae0b8 EFLAGS: 00010207 RAX: 00000000000020a9 RBX: dffffc0000000000 RCX: ffffffff86d18762 kobject: 'loop3' (00000000ca6ff421): kobject_uevent_env RDX: 0000000000000000 RSI: ffffffff86d1865e RDI: 000000000001054c RBP: ffff888057bae1b8 R08: ffff88805254c640 R09: ffffed10151cc526 kobject: 'loop3' (00000000ca6ff421): fill_kobj_path: path = '/devices/virtual/block/loop3' R10: ffffed10151cc525 R11: ffff8880a8e6292f R12: 0000000000000001 R13: ffff8880a8e62900 R14: 00000000000104dc R15: 0000000000000001 FS: 00007f50d846d700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000012e73d8 CR3: 000000009b325000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fib6_del_route net/ipv6/ip6_fib.c:1813 [inline] fib6_del+0xbdb/0x12e0 net/ipv6/ip6_fib.c:1844 fib6_clean_node+0x453/0x660 net/ipv6/ip6_fib.c:2006 fib6_walk_continue+0x4b3/0x8e0 net/ipv6/ip6_fib.c:1928 fib6_walk+0x9d/0x100 net/ipv6/ip6_fib.c:1976 fib6_clean_tree+0x22a/0x340 net/ipv6/ip6_fib.c:2055 __fib6_clean_all+0x216/0x430 net/ipv6/ip6_fib.c:2071 fib6_clean_all+0x2b/0x40 net/ipv6/ip6_fib.c:2082 rt6_sync_down_dev+0x17e/0x1b0 net/ipv6/route.c:4041 rt6_disable_ip+0x80/0x730 net/ipv6/route.c:4046 addrconf_ifdown+0x13e/0x15e0 net/ipv6/addrconf.c:3669 addrconf_notify+0x629/0x25f0 net/ipv6/addrconf.c:3594 notifier_call_chain+0x179/0x380 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1739 call_netdevice_notifiers_extack net/core/dev.c:1751 [inline] call_netdevice_notifiers net/core/dev.c:1765 [inline] dev_close_many+0x42e/0x890 net/core/dev.c:1508 rollback_registered_many+0x544/0x1370 net/core/dev.c:8079 rollback_registered+0x1c9/0x410 net/core/dev.c:8144 unregister_netdevice_queue net/core/dev.c:9188 [inline] unregister_netdevice_queue+0x30e/0x660 net/core/dev.c:9181 unregister_netdevice include/linux/netdevice.h:2639 [inline] __tun_detach+0x11ae/0x1600 drivers/net/tun.c:727 tun_detach drivers/net/tun.c:744 [inline] tun_chr_close+0xe0/0x180 drivers/net/tun.c:3433 __fput+0x3c5/0xb10 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x1f4/0x2b0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x19d6/0x2650 kernel/exit.c:867 do_group_exit+0x177/0x430 kernel/exit.c:970 get_signal+0x8b4/0x19b0 kernel/signal.c:2517 do_signal+0x91/0x1ea0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2f7/0x3b0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x696/0x800 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f50d846ccf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000073bf08 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000073bf08 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000073bf0c R13: 00007ffd9cc80c5f R14: 00007f50d846d9c0 R15: 000000000073bf0c Modules linked in: ---[ end trace 9ca9e00c3d1d1132 ]--- RIP: 0010:fib6_drop_pcpu_from net/ipv6/ip6_fib.c:924 [inline] RIP: 0010:fib6_purge_rt+0x5c9/0x7f0 net/ipv6/ip6_fib.c:960 Code: 0f b6 3d d9 78 86 03 31 ff 44 89 fe e8 20 72 b0 fa 45 84 ff 0f 84 e3 00 00 00 e8 d2 70 b0 fa 49 8d 7e 70 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 b8 01 00 00 48 8d 45 98 4d 8b 7e 70 48 89 c2 48 RSP: 0018:ffff888057bae0b8 EFLAGS: 00010207 RAX: 00000000000020a9 RBX: dffffc0000000000 RCX: ffffffff86d18762 RDX: 0000000000000000 RSI: ffffffff86d1865e RDI: 000000000001054c RBP: ffff888057bae1b8 R08: ffff88805254c640 R09: ffffed10151cc526 R10: ffffed10151cc525 R11: ffff8880a8e6292f R12: 0000000000000001 R13: ffff8880a8e62900 R14: 00000000000104dc R15: 0000000000000001 FS: 00007f50d846d700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000012e73d8 CR3: 000000009b325000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400