batman_adv: batadv0: Removing interface: batadv_slave_1 audit: type=1800 audit(1638151590.371:151): pid=23936 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="sda1" ino=15166 res=0 INFO: task kworker/u4:4:2927 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:4 D25824 2927 2 0x80000000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline] _synchronize_rcu_expedited+0x60c/0x6f0 kernel/rcu/tree_exp.h:667 synchronize_rcu+0xc6/0x160 kernel/rcu/tree_plugin.h:818 synchronize_net+0x47/0x50 net/core/dev.c:9281 tipc_bcast_stop+0x187/0x300 net/tipc/bcast.c:545 tipc_exit_net+0x40/0x60 net/tipc/core.c:101 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153 cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:554 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Showing all locks held in the system: 3 locks held by systemd/1: 1 lock held by khungtaskd/1570: #0: 00000000d652afe5 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 4 locks held by kworker/u4:4/2927: #0: 000000009b6e4577 ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 0000000077a7fde0 (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 000000005a7ddec7 (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:521 #3: 000000000a4b3517 (rcu_preempt_state.barrier_mutex){+.+.}, at: _rcu_barrier+0x59/0x3e0 kernel/rcu/tree.c:3430 3 locks held by kworker/1:3/4714: #0: 0000000010714641 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 000000007b5090f2 ((work_completion)(&smc->tcp_listen_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 00000000c28413ea (&smc->clcsock_release_lock){+.+.}, at: smc_clcsock_accept net/smc/af_smc.c:843 [inline] #2: 00000000c28413ea (&smc->clcsock_release_lock){+.+.}, at: smc_tcp_listen_work+0x191/0xce0 net/smc/af_smc.c:1314 1 lock held by in:imklog/7801: #0: 00000000148dba6f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by agetty/8032: #0: 0000000001e761e6 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000004dc44c94 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154 3 locks held by kworker/1:5/11252: #0: 0000000010714641 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 000000001223bfe4 ((work_completion)(&smc->tcp_listen_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 000000008c54564d (&smc->clcsock_release_lock){+.+.}, at: smc_clcsock_accept net/smc/af_smc.c:843 [inline] #2: 000000008c54564d (&smc->clcsock_release_lock){+.+.}, at: smc_tcp_listen_work+0x191/0xce0 net/smc/af_smc.c:1314 2 locks held by syz-executor.3/17061: #0: 0000000086e102a7 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:759 [inline] #0: 0000000086e102a7 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3323 #1: 000000007dc7f890 (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #1: 000000007dc7f890 (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x4dc/0x6f0 kernel/rcu/tree_exp.h:667 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-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+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_tt_purge RIP: 0010:__lock_release kernel/locking/lockdep.c:3677 [inline] RIP: 0010:lock_release+0x241/0x8b0 kernel/locking/lockdep.c:3927 Code: 03 38 d0 7c 08 84 d2 0f 85 c6 05 00 00 44 89 f8 0b 05 43 eb d8 0b 0f 84 69 04 00 00 48 8d 4c 24 38 44 89 fa 48 89 ee 4c 89 f7 ba 72 ff ff 48 85 c0 0f 84 a9 03 00 00 48 8d 78 24 48 ba 00 00 RSP: 0018:ffff8880b5a47b80 EFLAGS: 00000006 RAX: 0000000000000003 RBX: ffffffff8d243760 RCX: ffff8880b5a47bb8 RDX: 0000000000000003 RSI: ffff88803aae9040 RDI: ffff8880b5a361c0 RBP: ffff88803aae9040 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff11016b48f73 R13: ffffffff87dbdb48 R14: ffff8880b5a361c0 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f15f542e000 CR3: 00000000a33f7000 CR4: 00000000003426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:174 [inline] _raw_spin_unlock_bh+0x17/0x30 kernel/locking/spinlock.c:200 spin_unlock_bh include/linux/spinlock.h:374 [inline] batadv_tt_local_purge+0x278/0x370 net/batman-adv/translation-table.c:1456 batadv_tt_purge+0x2c/0xa00 net/batman-adv/translation-table.c:3811 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 ---------------- Code disassembly (best guess): 0: 03 38 add (%rax),%edi 2: d0 7c 08 84 sarb -0x7c(%rax,%rcx,1) 6: d2 0f rorb %cl,(%rdi) 8: 85 c6 test %eax,%esi a: 05 00 00 44 89 add $0x89440000,%eax f: f8 clc 10: 0b 05 43 eb d8 0b or 0xbd8eb43(%rip),%eax # 0xbd8eb59 16: 0f 84 69 04 00 00 je 0x485 1c: 48 8d 4c 24 38 lea 0x38(%rsp),%rcx 21: 44 89 fa mov %r15d,%edx 24: 48 89 ee mov %rbp,%rsi 27: 4c 89 f7 mov %r14,%rdi * 2a: e8 ba 72 ff ff callq 0xffff72e9 <-- trapping instruction 2f: 48 85 c0 test %rax,%rax 32: 0f 84 a9 03 00 00 je 0x3e1 38: 48 8d 78 24 lea 0x24(%rax),%rdi 3c: 48 rex.W 3d: ba .byte 0xba