INFO: task syz-executor.0:29225 blocked for more than 143 seconds. Not tainted 5.13.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27664 pid:29225 ppid: 12839 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:00007f204d119188 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: 00007ffda29f66bf R14: 00007f204d119300 R15: 0000000000022000 INFO: task syz-executor.0:29227 blocked for more than 143 seconds. Not tainted 5.13.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27216 pid:29227 ppid: 12839 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:00007f204d0f8188 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: 00007ffda29f66bf R14: 00007f204d0f8300 R15: 0000000000022000 Showing all locks held in the system: 4 locks held by kworker/u4:5/205: #0: ffff888140143138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 kernel/workqueue.c:2249 #1: ffffc900017dfd20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 kernel/workqueue.c:2251 #2: ffffffff8df1f870 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf0/0xc60 net/core/net_namespace.c:557 #3: ffff8880b9b35118 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1334 [inline] #3: ffff8880b9b35118 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x144/0x1120 kernel/sched/core.c:5061 1 lock held by khungtaskd/1613: #0: ffffffff8cf15c80 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/8104: #0: ffff88802879e5f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:974 2 locks held by rs:main Q:Reg/8105: 2 locks held by agetty/22886: #0: ffff88807858e098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:267 #1: ffffc900036432e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6c3/0x1cf0 drivers/tty/n_tty.c:2179 1 lock held by syz-executor.0/29225: #0: ffffffff8df1f870 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0xad/0xa80 net/core/dev.c:1902 1 lock held by syz-executor.0/29227: #0: ffffffff8df1f870 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0xad/0xa80 net/core/dev.c:1902 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1613 Comm: khungtaskd Not tainted 5.13.0-rc4-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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4842 Comm: systemd-journal Not tainted 5.13.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_preemption_disabled+0x22/0x190 lib/smp_processor_id.c:13 Code: 0f 1f 84 00 00 00 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 49 89 f6 49 89 ff 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 <0f> 1f 44 00 00 65 8b 1d 52 1d 41 76 65 8b 2d 83 77 41 76 89 ee 81 RSP: 0018:ffffc900010ffdf0 EFLAGS: 00000086 RAX: 47b8980318c25e00 RBX: 0000000000000fa9 RCX: 1ffffffff1f40000 RDX: 1ffffffff1f40000 RSI: ffffffff8a929f40 RDI: ffffffff8a929f00 RBP: 1ffff110025b37ec R08: ffffffff8fa00000 R09: ffffffff8fa00008 R10: ffffffff8fa0001c R11: ffffffff8fa00010 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffffff8a929f40 R15: ffffffff8a929f00 FS: 00007f5494d3b8c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f54921db000 CR3: 0000000016be5000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: steal_account_process_time kernel/sched/cputime.c:242 [inline] account_other_time+0x135/0x280 kernel/sched/cputime.c:262 get_vtime_delta kernel/sched/cputime.c:656 [inline] vtime_user_exit+0xf9/0x3e0 kernel/sched/cputime.c:720 __context_tracking_exit+0x7a/0xd0 kernel/context_tracking.c:160 user_exit_irqoff include/linux/context_tracking.h:47 [inline] __enter_from_user_mode kernel/entry/common.c:21 [inline] syscall_enter_from_user_mode+0x19c/0x1c0 kernel/entry/common.c:103 do_syscall_64+0x21/0xb0 arch/x86/entry/common.c:42 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f5493fd3f17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007ffff9667928 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 000055b16f2711e0 RCX: 00007f5493fd3f17 RDX: 00007ffff96679e0 RSI: 0000000000000000 RDI: 000055b16f2711e0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000202 R12: 00007ffff96679e0 R13: 00000000000012ea R14: 00007ffff966a7d0 R15: 00007ffff9667de0