INFO: task syz-executor.3:23693 blocked for more than 143 seconds. Not tainted 5.6.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29400 23693 9062 0x00004004 Call Trace: context_switch kernel/sched/core.c:3386 [inline] __schedule+0x87f/0xcd0 kernel/sched/core.c:4082 schedule+0x188/0x210 kernel/sched/core.c:4156 __lock_sock+0x15f/0x2a0 net/core/sock.c:2413 lock_sock_nested+0x7c/0x120 net/core/sock.c:2938 virtio_transport_release+0x5e/0xd20 net/vmw_vsock/virtio_transport_common.c:832 vsock_assign_transport+0x1e5/0x3b0 net/vmw_vsock/af_vsock.c:454 vsock_stream_connect+0x46d/0xb50 net/vmw_vsock/af_vsock.c:1288 __sys_connect_file net/socket.c:1857 [inline] __sys_connect+0x314/0x3a0 net/socket.c:1874 __do_sys_connect net/socket.c:1885 [inline] __se_sys_connect net/socket.c:1882 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:1882 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c6c9 Code: 08 48 c7 44 24 10 00 00 00 00 48 89 74 24 18 48 89 7c 24 20 48 89 54 24 28 48 89 4c 24 30 0f 57 c0 0f 11 44 24 38 48 c7 44 24 <48> 00 00 00 00 e8 ad 53 ff ff 48 8b 44 24 50 48 8b 4c 24 58 48 89 RSP: 002b:00007fb67d2e1c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fb67d2e26d4 RCX: 000000000045c6c9 RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000092 R14: 00000000004c3122 R15: 000000000076bf2c Showing all locks held in the system: 1 lock held by khungtaskd/391: #0: ffffffff892d98c8 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207 6 locks held by rs:main Q:Reg/8915: #0: ffff8880aeb37198 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1215 [inline] #0: ffff8880aeb37198 (&rq->lock){-.-.}, at: __schedule+0xdb/0xcd0 kernel/sched/core.c:4030 #1: ffffffff892d98c8 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207 #2: ffff88808d599548 (&sb->s_type->i_mutex_key#10){++++}, at: inode_lock include/linux/fs.h:791 [inline] #2: ffff88808d599548 (&sb->s_type->i_mutex_key#10){++++}, at: ext4_buffered_write_iter+0xa5/0x5c0 fs/ext4/file.c:264 #3: ffffffff892d98c8 (rcu_read_lock){....}, at: rcu_lock_acquire+0x9/0x40 include/linux/rcupdate.h:207 #4: ffff8880aeb37198 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1215 [inline] #4: ffff8880aeb37198 (&rq->lock){-.-.}, at: ttwu_queue kernel/sched/core.c:2409 [inline] #4: ffff8880aeb37198 (&rq->lock){-.-.}, at: try_to_wake_up+0x8df/0xeb0 kernel/sched/core.c:2645 #5: ffffffff892d98c8 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207 1 lock held by rsyslogd/8917: #0: ffff8880a80221a0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x279/0x310 fs/file.c:821 2 locks held by getty/9007: #0: ffff888095cc4090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc900017db2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/9008: #0: ffff888094616090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000186b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/9009: #0: ffff8880a4da2090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000187b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/9010: #0: ffff88809990c090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000185b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/9011: #0: ffff8880a4ce7090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc9000183b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/9012: #0: ffff8880a802c090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc900017fb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 2 locks held by getty/9013: #0: ffff888097fc0090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc900017bb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.3/23693: #0: ffff88804bca38d0 (sk_lock-AF_VSOCK){+.+.}, at: lock_sock include/net/sock.h:1516 [inline] #0: ffff88804bca38d0 (sk_lock-AF_VSOCK){+.+.}, at: vsock_stream_connect+0x110/0xb50 net/vmw_vsock/af_vsock.c:1258 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 391 Comm: khungtaskd Not tainted 5.6.0-rc1-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+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaa/0x190 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16f/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace+0x17/0x20 include/linux/nmi.h:146 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xd40/0xd60 kernel/hung_task.c:289 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 19086 Comm: kworker/u4:0 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:check_memory_region+0x222/0x2f0 mm/kasan/generic.c:192 Code: 03 4d 89 cf 49 8d 5e 07 4d 85 f6 49 0f 49 de 48 83 e3 f8 49 29 de 74 11 45 0f b6 1f 45 84 db 75 65 49 ff c7 49 ff ce 75 ef 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 45 84 db 75 50 45 8a 59 01 45 84 db RSP: 0018:ffffc90005067b60 EFLAGS: 00000056 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff815bb98d RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8969b460 RBP: ffffc90005067b80 R08: dffffc0000000000 R09: fffffbfff12d368d R10: fffffbfff12d368d R11: 0000000000000000 R12: 1ffffffff12d368c R13: dffffc0000000001 R14: 0000000000000001 R15: ffff8880967c0ea8 FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000a6902000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __kasan_check_read+0x11/0x20 mm/kasan/common.c:95 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] cpumask_test_cpu include/linux/cpumask.h:360 [inline] trace_lock_acquire+0x13d/0x1d0 include/trace/events/lock.h:13 lock_acquire+0x125/0x250 kernel/locking/lockdep.c:4483 rcu_lock_acquire+0x2e/0x40 include/linux/rcupdate.h:208 rcu_read_lock include/linux/rcupdate.h:601 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:407 [inline] batadv_nc_worker+0xc7/0x5f0 net/batman-adv/network-coding.c:718 process_one_work+0x7f5/0x10f0 kernel/workqueue.c:2264 worker_thread+0xbbc/0x1630 kernel/workqueue.c:2410 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352