INFO: task syz-executor.4:10126 blocked for more than 143 seconds. Not tainted 5.13.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:25272 pid:10126 ppid: 8449 flags:0x00004006 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 unregister_netdevice_notifier+0x8e/0x430 net/core/dev.c:1949 bcm_release+0x77/0x820 net/can/bcm.c:1474 __sock_release net/socket.c:599 [inline] sock_close+0xd8/0x260 net/socket.c:1258 __fput+0x352/0x7b0 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0x736/0x23d0 kernel/exit.c:826 do_group_exit+0x168/0x2d0 kernel/exit.c:923 get_signal+0x1770/0x2180 kernel/signal.c:2835 arch_do_signal_or_restart+0x8e/0x6c0 arch/x86/kernel/signal.c:789 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0xac/0x200 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x70 kernel/entry/common.c:301 do_syscall_64+0x4b/0xb0 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 RSP: 002b:00007f0afd743188 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: 0000000000000004 RBX: 000000000056c0f0 RCX: 00000000004665d9 RDX: 0000000000000002 RSI: 0000000000000002 RDI: 000000000000001d RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0f0 R13: 00007fffbdfd627f R14: 00007f0afd743300 R15: 0000000000022000 Showing all locks held in the system: 3 locks held by kworker/u4:1/25: #0: ffff888140143138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 kernel/workqueue.c:2249 #1: ffffc90000dffd20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 kernel/workqueue.c:2251 #2: ffffffff8df1f5f0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf0/0xc60 net/core/net_namespace.c:557 3 locks held by kworker/u4:5/180: #0: ffff8880b9b35118 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x86f/0xc60 kernel/sched/fair.c:10665 #1: ffff8880b9b1f848 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x51e/0x7a0 kernel/sched/psi.c:872 #2: ffff8880b9b24058 (&base->lock){..-.}-{2:2}, at: lock_timer_base+0x12a/0x270 kernel/time/timer.c:944 1 lock held by khungtaskd/1596: #0: ffffffff8cf15c40 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/8113: 3 locks held by kworker/1:8/9741: #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 #2: ffffffff8cfe7db8 (kfence_freelist_lock){..-.}-{2:2}, at: kfence_guarded_free+0x5e8/0x830 mm/kfence/core.c:404 2 locks held by syz-executor.4/10126: #0: ffff888037629710 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:774 [inline] #0: ffff888037629710 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: __sock_release net/socket.c:598 [inline] #0: ffff888037629710 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: sock_close+0x94/0x260 net/socket.c:1258 #1: ffffffff8df1f5f0 (pernet_ops_rwsem){++++}-{3:3}, at: unregister_netdevice_notifier+0x8e/0x430 net/core/dev.c:1949 1 lock held by syz-executor.0/10652: #0: ffffffff8df1f5f0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x378/0x5e0 net/core/net_namespace.c:470 1 lock held by syz-executor.4/10654: #0: ffffffff8df1f5f0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x378/0x5e0 net/core/net_namespace.c:470 1 lock held by syz-executor.1/10656: #0: ffffffff8df1f5f0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x378/0x5e0 net/core/net_namespace.c:470 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1596 Comm: khungtaskd Not tainted 5.13.0-rc3-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-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:format_decode+0x109a/0x1ab0 lib/vsprintf.c:2634 Code: 04 25 28 00 00 00 48 3b 84 24 a0 00 00 00 0f 85 06 0a 00 00 44 2b 6c 24 58 44 89 e8 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d 4c 89 f7 48 c7 c6 e0 5d 51 8d e8 e6 5d 5f fd 41 80 fe 68 74 3b RSP: 0018:ffffc9000a94f8d8 EFLAGS: 00000002 RAX: 0000000000000002 RBX: ffffc9000a94f960 RCX: ffff888012fe8000 RDX: 0000000000000000 RSI: ffffffff8d515e00 RDI: 0000000000000063 RBP: ffffc9000a94f9d0 R08: 0000000000000005 R09: ffffffff841faba1 R10: 000000000000000a R11: ffff888012fe8000 R12: ffffffff8a2f980d R13: dffffc0000000000 R14: ffff88802e3b8109 R15: ffffffff8a2f980d FS: 00007ff18c66f8c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff189aa4000 CR3: 00000000165a2000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vsnprintf+0x15b/0x1d60 lib/vsprintf.c:2704 vscnprintf lib/vsprintf.c:2855 [inline] scnprintf+0xc3/0x160 lib/vsprintf.c:2909 info_print_ext_header kernel/printk/printk.c:572 [inline] devkmsg_read+0x5fe/0x970 kernel/printk/printk.c:759 vfs_read+0x294/0xc20 fs/read_write.c:494 ksys_read+0x171/0x2a0 fs/read_write.c:634 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7ff18bbfe210 Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 RSP: 002b:00007ffcf338ba78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007ffcf338e4f0 RCX: 00007ff18bbfe210 RDX: 0000000000002000 RSI: 00007ffcf338c2f0 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000008 R09: 0000000000000070 R10: 00007ffcf33a2118 R11: 0000000000000246 R12: 00007ffcf338c2f0 R13: 00007ffcf338e448 R14: 00005561f161d958 R15: 0005c37b77c49546