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Thu, 10 Dec 2020 11:53:11 -0800 (PST) Date: Thu, 10 Dec 2020 11:53:11 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008fd03305b62186a7@google.com> Subject: INFO: task can't die in inet_twsk_purge From: syzbot To: davem@davemloft.net, kuba@kernel.org, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, yoshfuji@linux-ipv6.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: a9e26cb5 Add linux-next specific files for 20201208 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=161a9613500000 kernel config: https://syzkaller.appspot.com/x/.config?x=e259434a8eaf0206 dashboard link: https://syzkaller.appspot.com/bug?extid=4c1b0c5364346e7beafa compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=109cf703500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1587c923500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4c1b0c5364346e7beafa@syzkaller.appspotmail.com INFO: task syz-executor343:8498 can't die for more than 143 seconds. task:syz-executor343 state:R running task stack:25920 pid: 8498 ppid: 8495 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5076 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:5338 rcu_read_unlock include/linux/rcupdate.h:694 [inline] inet_twsk_purge+0x57f/0x810 net/ipv4/inet_timewait_sock.c:299 INFO: task syz-executor343:8743 can't die for more than 145 seconds. task:syz-executor343 state:R running task stack:25768 pid: 8743 ppid: 8494 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5076 preempt_schedule_notrace+0x5b/0xd0 kernel/sched/core.c:5309 INFO: task syz-executor343:8744 can't die for more than 147 seconds. task:syz-executor343 state:R running task stack:25784 pid: 8744 ppid: 8490 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5076 INFO: task syz-executor343:8745 can't die for more than 148 seconds. task:syz-executor343 state:D stack:25864 pid: 8745 ppid: 8491 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5076 schedule+0xcf/0x270 kernel/sched/core.c:5155 synchronize_rcu_expedited+0x458/0x620 kernel/rcu/tree_exp.h:852 synchronize_rcu+0xee/0x190 kernel/rcu/tree.c:3729 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:190 setup_net+0x508/0x850 net/core/net_namespace.c:365 copy_net_ns+0x376/0x7b0 net/core/net_namespace.c:483 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xbd/0x230 kernel/nsproxy.c:231 ksys_unshare+0x445/0x8e0 kernel/fork.c:2958 __do_sys_unshare kernel/fork.c:3026 [inline] __se_sys_unshare kernel/fork.c:3024 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3024 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4414a9 RSP: 002b:00007ffd8be6e998 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004414a9 RDX: 00000000004414a9 RSI: ffffffffffffffff RDI: 0000000040000000 RBP: 000000000007851d R08: 00000000000000c2 R09: 00000000000000c2 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004021a0 R13: 0000000000402230 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor343:8748 can't die for more than 151 seconds. task:syz-executor343 state:R running task stack:25784 pid: 8748 ppid: 8493 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5076 native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline] arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline] lock_is_held_type+0xc2/0x100 kernel/locking/lockdep.c:5478 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches