INFO: task syz-executor.3:11139 blocked for more than 143 seconds. Not tainted 5.13.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:27664 pid:11139 ppid: 8869 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0xb98/0x1120 kernel/sched/core.c:5147 schedule+0x14b/0x200 kernel/sched/core.c:5226 rwsem_down_write_slowpath+0xe52/0x1590 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x165/0x170 kernel/locking/rwsem.c:1407 register_netdevice_notifier+0xad/0xa80 net/core/dev.c:1902 bcm_init+0x11e/0x160 net/can/bcm.c:1451 can_create+0x247/0x450 net/can/af_can.c:168 __sock_create+0x59b/0x8c0 net/socket.c:1408 sock_create net/socket.c:1459 [inline] __sys_socket+0x115/0x350 net/socket.c:1501 __do_sys_socket net/socket.c:1510 [inline] __se_sys_socket net/socket.c:1508 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1508 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007ff8ae4de188 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000002 RSI: 0000000000000002 RDI: 000000000000001d RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffcf3cc0e0f R14: 00007ff8ae4de300 R15: 0000000000022000 INFO: task syz-executor.3:11143 blocked for more than 143 seconds. Not tainted 5.13.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:27216 pid:11143 ppid: 8869 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4339 [inline] __schedule+0xb98/0x1120 kernel/sched/core.c:5147 schedule+0x14b/0x200 kernel/sched/core.c:5226 rwsem_down_write_slowpath+0xe52/0x1590 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x165/0x170 kernel/locking/rwsem.c:1407 register_netdevice_notifier+0xad/0xa80 net/core/dev.c:1902 bcm_init+0x11e/0x160 net/can/bcm.c:1451 can_create+0x247/0x450 net/can/af_can.c:168 __sock_create+0x59b/0x8c0 net/socket.c:1408 sock_create net/socket.c:1459 [inline] __sys_socket+0x115/0x350 net/socket.c:1501 __do_sys_socket net/socket.c:1510 [inline] __se_sys_socket net/socket.c:1508 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1508 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007ff8ae4bd188 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9 RDX: 0000000000000002 RSI: 0000000000000002 RDI: 000000000000001d RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffcf3cc0e0f R14: 00007ff8ae4bd300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1623: #0: ffffffff8cf15cc0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 2 locks held by systemd-journal/4843: #0: ffff8880b9b35118 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1334 [inline] #0: ffff8880b9b35118 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x144/0x1120 kernel/sched/core.c:5061 #1: ffff8880b9b1f848 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x51e/0x7a0 kernel/sched/psi.c:872 1 lock held by in:imklog/8119: #0: ffff888028ab85f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:974 2 locks held by agetty/8390: #0: ffff8880206b7098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc90000ea82e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6c3/0x1cf0 drivers/tty/n_tty.c:2179 3 locks held by kworker/u4:9/19632: #0: ffff888012c6b138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 kernel/workqueue.c:2249 #1: ffffc900031dfd20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 kernel/workqueue.c:2251 #2: ffffffff8df1f9b0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf0/0xc60 net/core/net_namespace.c:557 1 lock held by syz-executor.3/11139: #0: ffffffff8df1f9b0 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0xad/0xa80 net/core/dev.c:1902 1 lock held by syz-executor.3/11143: #0: ffffffff8df1f9b0 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0xad/0xa80 net/core/dev.c:1902 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1623 Comm: khungtaskd Not tainted 5.13.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x202/0x31e lib/dump_stack.c:120 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xcfb/0xd40 kernel/hung_task.c:294 kthread+0x39a/0x3c0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4843 Comm: systemd-journal Not tainted 5.13.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lockdep_hardirqs_on_prepare+0x26/0x750 kernel/locking/lockdep.c:4120 Code: 00 00 00 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 80 00 00 00 65 48 8b 04 25 28 00 00 00 48 89 44 24 60 <48> ba 00 00 00 00 00 fc ff df 48 c7 44 24 20 b3 8a b5 41 48 c7 44 RSP: 0018:ffffc9000167fe60 EFLAGS: 00000086 RAX: 788bf8af1dbbd200 RBX: ffffffff89c04afb RCX: ffff888017598000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff89c04afb RBP: ffffc9000167ff08 R08: ffffffff81856d93 R09: fffffbfff1c7054e R10: fffffbfff1c7054e R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc9000167ff58 R15: 0000000000000000 FS: 00007f5c96c378c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5c93af0008 CR3: 0000000028de2000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __exit_to_user_mode kernel/entry/common.c:127 [inline] syscall_exit_to_user_mode+0x38/0x70 kernel/entry/common.c:304 do_syscall_64+0x4b/0xb0 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f5c95ef29c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffeb100a5c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: 0000000000000000 RBX: 00007ffeb100d5f0 RCX: 00007f5c95ef29c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000558adb0799a3 RBP: 00007ffeb100a710 R08: 0000558adb06f3e5 R09: 0000000000000018 R10: 0000000000000020 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000558adc2508a0 R15: 00007ffeb100ac00