INFO: task kworker/u4:6:9833 blocked for more than 143 seconds. Not tainted 5.10.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:6 state:D stack:26360 pid: 9833 ppid: 2 flags:0x00004000 Workqueue: tc_filter_workqueue fw_delete_filter_work Call Trace: context_switch kernel/sched/core.c:3779 [inline] __schedule+0x92c/0xcb0 kernel/sched/core.c:4528 schedule+0x14b/0x200 kernel/sched/core.c:4606 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4665 __mutex_lock_common+0x122f/0x2f20 kernel/locking/mutex.c:1033 __mutex_lock kernel/locking/mutex.c:1103 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1118 fw_delete_filter_work+0x15/0xe0 net/sched/cls_fw.c:125 process_one_work+0x789/0xfc0 kernel/workqueue.c:2272 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2418 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 INFO: task syz-executor.3:10578 blocked for more than 143 seconds. Not tainted 5.10.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:27736 pid:10578 ppid: 8481 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3779 [inline] __schedule+0x92c/0xcb0 kernel/sched/core.c:4528 schedule+0x14b/0x200 kernel/sched/core.c:4606 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4665 __mutex_lock_common+0x122f/0x2f20 kernel/locking/mutex.c:1033 __mutex_lock kernel/locking/mutex.c:1103 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1118 sock_do_ioctl+0x11e/0x260 net/socket.c:1060 sock_ioctl+0x4ad/0x690 net/socket.c:1198 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e0f9 RSP: 002b:00007f2ba16c5c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e0f9 RDX: 0000000000400200 RSI: 0000000000008912 RDI: 0000000000000005 RBP: 000000000119c068 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034 R13: 00007fffd377b1af R14: 00007f2ba16c69c0 R15: 000000000119c034 Showing all locks held in the system: 1 lock held by khungtaskd/1642: #0: ffffffff8bce6940 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/8116: #0: ffff88801c93d270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24b/0x2e0 fs/file.c:932 3 locks held by kworker/u4:6/9833: #0: ffff888141915138 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2245 #1: ffffc90015fd7d78 ((work_completion)(&(rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2247 #2: ffffffff8cca5b48 (rtnl_mutex){+.+.}-{3:3}, at: fw_delete_filter_work+0x15/0xe0 net/sched/cls_fw.c:125 3 locks held by kworker/1:5/9915: #0: ffff8881476aa538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2245 #1: ffffc90016277d78 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2247 #2: ffffffff8cca5b48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4568 2 locks held by syz-executor.2/10557: 1 lock held by syz-executor.3/10570: #0: ffffffff8cca5b48 (rtnl_mutex){+.+.}-{3:3}, at: sock_do_ioctl+0x11e/0x260 net/socket.c:1060 1 lock held by syz-executor.3/10578: #0: ffffffff8cca5b48 (rtnl_mutex){+.+.}-{3:3}, at: sock_do_ioctl+0x11e/0x260 net/socket.c:1060 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1642 Comm: khungtaskd Not tainted 5.10.0-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:77 [inline] dump_stack+0x137/0x1be lib/dump_stack.c:118 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+0xcde/0xd20 kernel/hung_task.c:294 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4875 Comm: systemd-journal Not tainted 5.10.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_preemption_disabled+0x14/0x170 lib/smp_processor_id.c:13 Code: 0c 8a 48 c7 c6 20 8d 0c 8a eb 0b 90 66 2e 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 RSP: 0018:ffffc90009b0fb28 EFLAGS: 00000086 RAX: ffffffffffffffff RBX: ffff88802597cec0 RCX: ffffffff8f4f1903 RDX: 0000000000000000 RSI: ffffffff89ae1dc0 RDI: ffffffff8a0c8d60 RBP: 1ffffffff1efa104 R08: ffffffff817afbe0 R09: fffffbfff1efa106 R10: fffffbfff1efa106 R11: 0000000000000000 R12: 0000000000000004 R13: 0000000000000000 R14: ffffffff89ae1dc0 R15: ffffffff8a0c8d60 FS: 00007f0b6f0b58c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0b6c4cc000 CR3: 00000000261bd000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lockdep_hardirqs_on+0x8d/0x130 kernel/locking/lockdep.c:4160 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x2e/0x60 kernel/locking/spinlock.c:191 __debug_check_no_obj_freed lib/debugobjects.c:997 [inline] debug_check_no_obj_freed+0x5a2/0x650 lib/debugobjects.c:1018 slab_free_hook mm/slub.c:1536 [inline] slab_free_freelist_hook+0xc6/0x1a0 mm/slub.c:1577 slab_free mm/slub.c:3142 [inline] kmem_cache_free+0x85/0x160 mm/slub.c:3158 putname fs/namei.c:259 [inline] filename_parentat+0x838/0xf60 fs/namei.c:2418 filename_create+0x5e/0x6b0 fs/namei.c:3450 user_path_create fs/namei.c:3525 [inline] do_mkdirat+0x56/0x310 fs/namei.c:3665 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f0b6e371687 Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007fff8e638b48 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fff8e63bbb0 RCX: 00007f0b6e371687 RDX: 0000000000000000 RSI: 00000000000001ed RDI: 00005563e042d8a0 RBP: 00007fff8e638b80 R08: 00005563e00e83e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 00005563e042d8a0 R15: 00007fff8e6391c0