INFO: task syz-executor.3:31252 blocked for more than 143 seconds. Not tainted 5.6.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29248 31252 10269 0x00004006 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4154 schedule_timeout+0x6db/0xba0 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x26a/0x3c0 kernel/sched/completion.c:136 rdma_destroy_id+0x66d/0xde0 drivers/infiniband/core/cma.c:1850 ucma_close+0x10b/0x300 drivers/infiniband/core/ucma.c:1762 __fput+0x2da/0x850 fs/file_table.c:280 task_work_run+0x13f/0x1b0 kernel/task_work.c:113 get_signal+0x2054/0x24e0 kernel/signal.c:2533 do_signal+0x7e/0x13f0 arch/x86/kernel/signal.c:813 exit_to_usermode_loop+0x26c/0x360 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c679 Code: cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 8f 00 00 00 48 83 ec 68 48 89 6c 24 60 48 8d 6c 24 60 48 8b 5a 10 48 8b 72 18 <48> 8b 7a 20 4c 8b 42 40 4c 8b 4a 08 48 8b 4a 30 48 8b 52 28 48 85 RSP: 002b:00007fa513b2ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: 0000000000000010 RBX: 00007fa513b2f6d4 RCX: 000000000045c679 RDX: 0000000000000010 RSI: 0000000020000240 RDI: 0000000000000003 RBP: 000000000076bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cbe R14: 00000000004cec51 R15: 000000000076bfac Showing all locks held in the system: 1 lock held by khungtaskd/1084: #0: ffffffff897accc0 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5331 2 locks held by getty/10210: #0: ffff888085486090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc900018132e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 2 locks held by getty/10211: #0: ffff8880a632b090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc900019d32e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 2 locks held by getty/10212: #0: ffff8880a632a090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc900019c32e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 2 locks held by getty/10213: #0: ffff888088ee3090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc9000185b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 2 locks held by getty/10214: #0: ffff888094965090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc900018332e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 2 locks held by getty/10215: #0: ffff888088ee8090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc900019b32e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 2 locks held by getty/10216: #0: ffff8880a8578090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc900017eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21d/0x1b30 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1084 Comm: khungtaskd Not tainted 5.6.0-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 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 kthread+0x357/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 11079 Comm: kworker/u4:8 Not tainted 5.6.0-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:preempt_count_sub+0x0/0x150 kernel/sched/core.c:3810 Code: 4c 8b 45 c0 48 8b 45 c8 48 8b 55 d0 e9 20 fc ff ff 89 4d d0 e8 51 21 60 00 8b 4d d0 e9 3a fe ff ff 66 0f 1f 84 00 00 00 00 00 <48> c7 c0 a0 03 3e 8c 53 89 fb 48 ba 00 00 00 00 00 fc ff df 48 89 RSP: 0018:ffffc90006fc7c50 EFLAGS: 00000046 RAX: 0000000000000007 RBX: 0000000000000201 RCX: 1ffffffff187c074 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000200 RBP: ffffffff879d9f24 R08: 0000000000000001 R09: ffffed1009bb5b3b R10: ffffed1009bb5b3a R11: ffff88804ddad9d3 R12: ffff888095492580 R13: ffffffff879da6e0 R14: ffff88804dd30b80 R15: 0000000000000076 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000009f06a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __local_bh_enable_ip+0x138/0x270 kernel/softirq.c:182 spin_unlock_bh include/linux/spinlock.h:383 [inline] batadv_nc_purge_paths+0x264/0x380 net/batman-adv/network-coding.c:470 batadv_nc_worker+0x2c6/0x760 net/batman-adv/network-coding.c:721 process_one_work+0x94b/0x1690 kernel/workqueue.c:2266 worker_thread+0x96/0xe20 kernel/workqueue.c:2412 kthread+0x357/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352