From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 27F15C433E1 for ; Mon, 6 Jul 2020 15:13:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 00DF520715 for ; Mon, 6 Jul 2020 15:13:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729531AbgGFPNQ (ORCPT ); Mon, 6 Jul 2020 11:13:16 -0400 Received: from mail-il1-f197.google.com ([209.85.166.197]:39011 "EHLO mail-il1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729242AbgGFPMY (ORCPT ); Mon, 6 Jul 2020 11:12:24 -0400 Received: by mail-il1-f197.google.com with SMTP id f66so22440527ilh.6 for ; Mon, 06 Jul 2020 08:12:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=U+a/7dG+Jm649g4Q7s1bTBlfdKiN+DjRc+s0w5ipG5w=; b=f/Fm7nEttqC6zlXdIDA5NTu4ho4Pl0z0v7ZoR/EaErqc289SRJU/Fu8lGW5G3K+eyA g0a1260VKiXty+SFskVMU7mpTUFLVk5j0+3a7IFH7uUmL73gkQFipSo6w1xuels+CGeN sMrX1Yui2/jCdoTc0C9OQF9y3kW0JU/OIfS8BBKbQ9YBZdluF1Ra4vnSdCUGS/Rg6pTf lJhTdvXQ1cWRVXhoACOcdfaAmh1r6W5oFszAkQOGENkV1JyzH81Z0R0Q/YLfsBOaX+IY 9TyrC0zP4JEPs1S7hEUC0c5iMKHbDKARkHpGY4sPdZ5g+AZfZdDPyePppohnmJhR0qvA r9xA== X-Gm-Message-State: AOAM530TmSB/krRavfIT7pOMEmDqiaAz0AFXPaLKyCD3kQ6iJzh8qxV5 97C0RUASGal/AfRYSYSIQzi6bqZNvC8SZ3nymWLg69RFBpf3 X-Google-Smtp-Source: ABdhPJyjsxk8AZywl0NzsgSUN9e5JtN8xMaRid4jPezb+sCR8yOWHcNFyz89YMXJn7Iq4YnXiGjmgRti8+K0LiL5gh7ouQORXEi5 MIME-Version: 1.0 X-Received: by 2002:a05:6e02:961:: with SMTP id q1mr28424101ilt.94.1594048342301; Mon, 06 Jul 2020 08:12:22 -0700 (PDT) Date: Mon, 06 Jul 2020 08:12:22 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000032a1a405a9c74d19@google.com> Subject: INFO: task hung in rtnl_lock From: syzbot To: davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 24085f70 Merge tag 'trace-v5.7-rc4' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1436b178100000 kernel config: https://syzkaller.appspot.com/x/.config?x=efdde85c3af536b5 dashboard link: https://syzkaller.appspot.com/bug?extid=634e86850449c71ddeb1 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+634e86850449c71ddeb1@syzkaller.appspotmail.com INFO: task syz-executor.2:1813 blocked for more than 143 seconds. Not tainted 5.7.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29600 1813 7229 0x00000004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x937/0x1ff0 kernel/sched/core.c:4083 __sched_text_start+0x8/0x8 schedule+0xd0/0x2a0 kernel/sched/core.c:4158 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 __might_fault mm/memory.c:4814 [inline] __might_fault+0x11f/0x1d0 mm/memory.c:4799 mutex_trylock+0x2c0/0x2c0 kernel/locking/mutex.c:126 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline] lockdep_hardirqs_on+0x463/0x620 kernel/locking/lockdep.c:3702 __might_fault mm/memory.c:4814 [inline] __might_fault+0x190/0x1d0 mm/memory.c:4799 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 rtnl_lock+0x5/0x20 net/core/rtnetlink.c:72 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 compat_ifr_data_ioctl+0x160/0x160 net/socket.c:3295 __sanitizer_cov_trace_switch+0x45/0x70 kernel/kcov.c:310 ioctl_fioasync fs/ioctl.c:601 [inline] do_vfs_ioctl+0x50c/0x1360 fs/ioctl.c:704 ioctl_file_clone+0x180/0x180 fs/ioctl.c:253 sock_ioctl+0x3ec/0x790 net/socket.c:1204 dlci_ioctl_set+0x30/0x30 net/socket.c:1043 ksys_dup3+0x3c0/0x3c0 include/linux/compiler.h:199 __do_sys_futex kernel/futex.c:3869 [inline] __se_sys_futex kernel/futex.c:3837 [inline] __x64_sys_futex+0x380/0x4f0 kernel/futex.c:3837 dlci_ioctl_set+0x30/0x30 net/socket.c:1043 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:771 __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl fs/ioctl.c:778 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:778 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline] lockdep_hardirqs_on+0x463/0x620 kernel/locking/lockdep.c:3702 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 INFO: task syz-executor.2:1820 blocked for more than 144 seconds. Not tainted 5.7.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28408 1820 7229 0x00000004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x937/0x1ff0 kernel/sched/core.c:4083 __sched_text_start+0x8/0x8 schedule+0xd0/0x2a0 kernel/sched/core.c:4158 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5451 mutex_trylock+0x2c0/0x2c0 kernel/locking/mutex.c:126 find_held_lock+0x2d/0x110 kernel/locking/lockdep.c:4458 rcu_read_unlock include/linux/rcupdate.h:651 [inline] rtnetlink_rcv_msg+0x3c3/0xad0 net/core/rtnetlink.c:5449 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5451 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5451 rtnl_bridge_getlink+0x870/0x870 net/core/rtnetlink.c:4654 netdev_core_pick_tx+0x2e0/0x2e0 net/core/dev.c:3939 __copy_skb_header+0x270/0x5b0 net/core/skbuff.c:941 skb_splice_bits+0x1a0/0x1a0 net/core/skbuff.c:2445 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468 slab_alloc mm/slab.c:3313 [inline] kmem_cache_alloc+0x261/0x740 mm/slab.c:3484 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 rtnl_bridge_getlink+0x870/0x870 net/core/rtnetlink.c:4654 netlink_ack+0xa10/0xa10 net/netlink/af_netlink.c:2426 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_attachskb+0x810/0x810 net/netlink/af_netlink.c:1235 _copy_from_iter_full+0x25c/0x870 lib/iov_iter.c:800 __phys_addr_symbol+0x2c/0x70 arch/x86/mm/physaddr.c:42 overlaps mm/usercopy.c:110 [inline] check_kernel_text_object mm/usercopy.c:142 [inline] __check_object_size mm/usercopy.c:289 [inline] __check_object_size+0x171/0x437 mm/usercopy.c:256 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 aa_af_perm+0x260/0x260 security/apparmor/net.c:141 netlink_unicast+0x740/0x740 net/netlink/af_netlink.c:82 netlink_unicast+0x740/0x740 net/netlink/af_netlink.c:82 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362 kernel_sendmsg+0x50/0x50 net/socket.c:692 ___sys_sendmsg+0x100/0x170 net/socket.c:2416 sendmsg_copy_msghdr+0x70/0x70 net/socket.c:2391 rcu_lock_release include/linux/rcupdate.h:213 [inline] rcu_read_unlock include/linux/rcupdate.h:655 [inline] __fget_files+0x32f/0x500 fs/file.c:734 ksys_dup3+0x3c0/0x3c0 include/linux/compiler.h:199 __fget_light fs/file.c:804 [inline] __fget_light+0x20e/0x270 fs/file.c:790 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449 __sys_sendmsg_sock+0xb0/0xb0 net/socket.c:2429 __do_sys_futex kernel/futex.c:3869 [inline] __se_sys_futex kernel/futex.c:3837 [inline] __x64_sys_futex+0x380/0x4f0 kernel/futex.c:3837 trace_hardirqs_off_caller+0x55/0x230 kernel/trace/trace_preemptirq.c:73 do_syscall_64+0x21/0x7d0 arch/x86/entry/common.c:288 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 INFO: task syz-executor.2:1821 blocked for more than 145 seconds. Not tainted 5.7.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29600 1821 7229 0x00000004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x937/0x1ff0 kernel/sched/core.c:4083 __sched_text_start+0x8/0x8 schedule+0xd0/0x2a0 kernel/sched/core.c:4158 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 __might_fault mm/memory.c:4814 [inline] __might_fault+0x11f/0x1d0 mm/memory.c:4799 mutex_trylock+0x2c0/0x2c0 kernel/locking/mutex.c:126 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline] lockdep_hardirqs_on+0x463/0x620 kernel/locking/lockdep.c:3702 __might_fault mm/memory.c:4814 [inline] __might_fault+0x190/0x1d0 mm/memory.c:4799 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 rtnl_lock+0x5/0x20 net/core/rtnetlink.c:72 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 compat_ifr_data_ioctl+0x160/0x160 net/socket.c:3295 __sanitizer_cov_trace_switch+0x45/0x70 kernel/kcov.c:310 ioctl_fioasync fs/ioctl.c:601 [inline] do_vfs_ioctl+0x50c/0x1360 fs/ioctl.c:704 ioctl_file_clone+0x180/0x180 fs/ioctl.c:253 sock_ioctl+0x3ec/0x790 net/socket.c:1204 dlci_ioctl_set+0x30/0x30 net/socket.c:1043 ksys_dup3+0x3c0/0x3c0 include/linux/compiler.h:199 __do_sys_futex kernel/futex.c:3869 [inline] __se_sys_futex kernel/futex.c:3837 [inline] __x64_sys_futex+0x380/0x4f0 kernel/futex.c:3837 dlci_ioctl_set+0x30/0x30 net/socket.c:1043 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:771 __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl fs/ioctl.c:778 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:778 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline] lockdep_hardirqs_on+0x463/0x620 kernel/locking/lockdep.c:3702 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 INFO: task syz-executor.3:1811 blocked for more than 145 seconds. Not tainted 5.7.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29304 1811 7322 0x00004004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x937/0x1ff0 kernel/sched/core.c:4083 __sched_text_start+0x8/0x8 schedule+0xd0/0x2a0 kernel/sched/core.c:4158 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 mutex_trylock+0x2c0/0x2c0 kernel/locking/mutex.c:126 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline] lockdep_hardirqs_on+0x463/0x620 kernel/locking/lockdep.c:3702 __might_fault mm/memory.c:4814 [inline] __might_fault+0x190/0x1d0 mm/memory.c:4799 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 rtnl_lock+0x5/0x20 net/core/rtnetlink.c:72 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 compat_ifr_data_ioctl+0x160/0x160 net/socket.c:3295 __sanitizer_cov_trace_switch+0x45/0x70 kernel/kcov.c:310 ioctl_fioasync fs/ioctl.c:601 [inline] do_vfs_ioctl+0x50c/0x1360 fs/ioctl.c:704 ioctl_file_clone+0x180/0x180 fs/ioctl.c:253 sock_ioctl+0x3ec/0x790 net/socket.c:1204 dlci_ioctl_set+0x30/0x30 net/socket.c:1043 ksys_dup3+0x3c0/0x3c0 include/linux/compiler.h:199 __do_sys_futex kernel/futex.c:3869 [inline] __se_sys_futex kernel/futex.c:3837 [inline] __x64_sys_futex+0x380/0x4f0 kernel/futex.c:3837 dlci_ioctl_set+0x30/0x30 net/socket.c:1043 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:771 __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl fs/ioctl.c:778 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:778 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline] lockdep_hardirqs_on+0x463/0x620 kernel/locking/lockdep.c:3702 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 INFO: task syz-executor.3:1819 blocked for more than 146 seconds. Not tainted 5.7.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29600 1819 7322 0x00000004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x937/0x1ff0 kernel/sched/core.c:4083 __sched_text_start+0x8/0x8 schedule+0xd0/0x2a0 kernel/sched/core.c:4158 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4217 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 __might_fault mm/memory.c:4814 [inline] __might_fault+0x11f/0x1d0 mm/memory.c:4799 mutex_trylock+0x2c0/0x2c0 kernel/locking/mutex.c:126 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline] lockdep_hardirqs_on+0x463/0x620 kernel/locking/lockdep.c:3702 __might_fault mm/memory.c:4814 [inline] __might_fault+0x190/0x1d0 mm/memory.c:4799 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 rtnl_lock+0x5/0x20 net/core/rtnetlink.c:72 sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 compat_ifr_data_ioctl+0x160/0x160 net/socket.c:3295 __sanitizer_cov_trace_switch+0x45/0x70 kernel/kcov.c:310 ioctl_fioasync fs/ioctl.c:601 [inline] do_vfs_ioctl+0x50c/0x1360 fs/ioctl.c:704 ioctl_file_clone+0x180/0x180 fs/ioctl.c:253 sock_ioctl+0x3ec/0x790 net/socket.c:1204 dlci_ioctl_set+0x30/0x30 net/socket.c:1043 ksys_dup3+0x3c0/0x3c0 include/linux/compiler.h:199 dlci_ioctl_set+0x30/0x30 net/socket.c:1043 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:771 __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl fs/ioctl.c:778 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:778 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline] lockdep_hardirqs_on+0x463/0x620 kernel/locking/lockdep.c:3702 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Showing all locks held in the system: 1 lock held by khungtaskd/1142: #0: ffffffff899bea80 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 1 lock held by in:imklog/6733: #0: ffff8880a847c670 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 3 locks held by kworker/0:16/28541: #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2239 #1: ffffc90008ecfdc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2243 #2: ffffffff8a582e68 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xb/0x60 net/core/link_watch.c:242 3 locks held by kworker/0:18/28543: #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2239 #1: ffffc90008edfdc0 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2243 #2: ffffffff8a582e68 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74 2 locks held by syz-executor.2/1810: #0: ffffffff8a582e68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8a582e68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5451 #1: ffffffff899c2ae0 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #1: ffffffff899c2ae0 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x501/0x620 kernel/rcu/tree_exp.h:856 1 lock held by syz-executor.2/1813: #0: ffffffff8a582e68 (rtnl_mutex){+.+.}-{3:3}, at: sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 1 lock held by syz-executor.2/1820: #0: ffffffff8a582e68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8a582e68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5451 1 lock held by syz-executor.2/1821: #0: ffffffff8a582e68 (rtnl_mutex){+.+.}-{3:3}, at: sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 1 lock held by syz-executor.3/1811: #0: ffffffff8a582e68 (rtnl_mutex){+.+.}-{3:3}, at: sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 1 lock held by syz-executor.3/1819: #0: ffffffff8a582e68 (rtnl_mutex){+.+.}-{3:3}, at: sock_do_ioctl+0x24e/0x2f0 net/socket.c:1066 3 locks held by kworker/0:0/1861: #0: ffff8880a8c20d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8880a8c20d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880a8c20d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880a8c20d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880a8c20d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880a8c20d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880a8c20d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2239 #1: ffffc90016dcfdc0 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2243 #2: ffffffff8a582e68 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4584 3 locks held by (d-rfkill)/1923: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1142 Comm: khungtaskd Not tainted 5.7.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 lapic_can_unplug_cpu.cold+0x3b/0x3b nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xa8c/0x1010 kernel/hung_task.c:289 reset_hung_task_detector+0x30/0x30 kernel/hung_task.c:243 kthread+0x388/0x470 kernel/kthread.c:268 kthread_mod_delayed_work+0x1a0/0x1a0 kernel/kthread.c:1090 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 161 Comm: kworker/u4:4 Not tainted 5.7.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:debug_lockdep_rcu_enabled.part.0+0x26/0x50 kernel/rcu/update.c:276 Code: 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 53 65 48 8b 1c 25 00 1f 02 00 48 8d bb c4 08 00 00 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 0f 8b 93 c4 08 00 RSP: 0018:ffffc900015a7bf0 EFLAGS: 00000807 RAX: dffffc0000000000 RBX: ffff8880a88203c0 RCX: 1ffffffff1513102 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880a8820c84 RBP: 0000000000000000 R08: ffff8880a88203c0 R09: fffffbfff1512ac1 R10: ffffffff8a895607 R11: fffffbfff1512ac0 R12: ffffffff899bea80 R13: ffffffff87b5f976 R14: dffffc0000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000028e10ac0 CR3: 000000009fff9000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x59e/0x800 kernel/locking/lockdep.c:4951 process_one_work+0x878/0x16a0 kernel/workqueue.c:2243 lock_downgrade+0x840/0x840 kernel/locking/lockdep.c:4579 rcu_lock_release include/linux/rcupdate.h:213 [inline] rcu_read_unlock include/linux/rcupdate.h:655 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:411 [inline] batadv_nc_worker+0x21c/0x760 net/batman-adv/network-coding.c:718 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 lock_release+0x800/0x800 kernel/locking/lockdep.c:4689 pwq_dec_nr_in_flight+0x310/0x310 kernel/workqueue.c:1198 rwlock_bug.part.0+0x90/0x90 include/linux/sched.h:1329 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 process_one_work+0x16a0/0x16a0 kernel/workqueue.c:2273 kthread+0x388/0x470 kernel/kthread.c:268 kthread_mod_delayed_work+0x1a0/0x1a0 kernel/kthread.c:1090 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.