INFO: task kworker/u4:6:9926 blocked for more than 143 seconds. Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:6 state:D stack:26248 pid: 9926 ppid: 2 flags:0x00004000 Workqueue: tc_filter_workqueue fw_delete_filter_work Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5076 schedule+0xcf/0x270 kernel/sched/core.c:5155 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 fw_delete_filter_work+0xe/0x20 net/sched/cls_fw.c:125 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 INFO: task syz-executor.1:13014 can't die for more than 143 seconds. task:syz-executor.1 state:D stack:28416 pid:13014 ppid: 8503 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5076 schedule+0xcf/0x270 kernel/sched/core.c:5155 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 sock_do_ioctl+0x1f2/0x2d0 net/socket.c:1049 sock_ioctl+0x477/0x6a0 net/socket.c:1176 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 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:00007f2f25c27c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e0f9 RDX: 0000000000400200 RSI: 0000000000008912 RDI: 0000000000000008 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffc8496101f R14: 00007f2f25c289c0 R15: 000000000119bf8c INFO: task syz-executor.1:13014 blocked for more than 144 seconds. Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28416 pid:13014 ppid: 8503 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5076 schedule+0xcf/0x270 kernel/sched/core.c:5155 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 sock_do_ioctl+0x1f2/0x2d0 net/socket.c:1049 sock_ioctl+0x477/0x6a0 net/socket.c:1176 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 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:00007f2f25c27c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e0f9 RDX: 0000000000400200 RSI: 0000000000008912 RDI: 0000000000000008 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffc8496101f R14: 00007f2f25c289c0 R15: 000000000119bf8c INFO: task syz-executor.2:13028 can't die for more than 144 seconds. task:syz-executor.2 state:R running task stack:24824 pid:13028 ppid: 8505 flags:0x00004006 Call Trace: INFO: task syz-executor.0:13030 can't die for more than 145 seconds. task:syz-executor.0 state:D stack:28304 pid:13030 ppid: 8501 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5076 schedule+0xcf/0x270 kernel/sched/core.c:5155 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5559 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2340 ___sys_sendmsg+0xf3/0x170 net/socket.c:2394 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2427 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e0f9 RSP: 002b:00007fd56437ec68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e0f9 RDX: 0000000000000000 RSI: 00000000200021c0 RDI: 0000000000000003 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffdb793a27f R14: 00007fd56437f9c0 R15: 000000000119bf8c INFO: task syz-executor.0:13030 blocked for more than 145 seconds. Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28304 pid:13030 ppid: 8501 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4325 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5076 schedule+0xcf/0x270 kernel/sched/core.c:5155 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5559 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2340 ___sys_sendmsg+0xf3/0x170 net/socket.c:2394 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2427 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e0f9 RSP: 002b:00007fd56437ec68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e0f9 RDX: 0000000000000000 RSI: 00000000200021c0 RDI: 0000000000000003 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffdb793a27f R14: 00007fd56437f9c0 R15: 000000000119bf8c Showing all locks held in the system: 1 lock held by khungtaskd/1662: #0: ffffffff8b33a7a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8209: #0: ffff8880139345f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:923 2 locks held by agetty/8428: #0: ffff888018b72098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266 #1: ffffc90000f682e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x21d/0x1aa0 drivers/tty/n_tty.c:2158 2 locks held by agetty/8438: #0: ffff8880248f6098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266 #1: ffffc90000fa82e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x21d/0x1aa0 drivers/tty/n_tty.c:2158 3 locks held by kworker/1:1/8599: #0: ffff888021016938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888021016938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888021016938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888021016938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888021016938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888021016938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2243 #1: ffffc90001a4fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2247 #2: ffffffff8c940f88 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4569 3 locks held by kworker/u4:6/9926: #0: ffff88814177c938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88814177c938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff88814177c938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88814177c938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff88814177c938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff88814177c938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2243 #1: ffffc900161ffda8 ((work_completion)(&(rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2247 #2: ffffffff8c940f88 (rtnl_mutex){+.+.}-{3:3}, at: fw_delete_filter_work+0xe/0x20 net/sched/cls_fw.c:125 1 lock held by syz-executor.1/10924: #0: ffffffff8c940f88 (rtnl_mutex){+.+.}-{3:3}, at: ppp_release+0x178/0x240 drivers/net/ppp/ppp_generic.c:401 1 lock held by syz-executor.1/13014: #0: ffffffff8c940f88 (rtnl_mutex){+.+.}-{3:3}, at: sock_do_ioctl+0x1f2/0x2d0 net/socket.c:1049 2 locks held by syz-executor.2/13028: 1 lock held by syz-executor.0/13030: #0: ffffffff8c940f88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8c940f88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5559 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1662 Comm: khungtaskd Not tainted 5.10.0-rc6-next-20201201-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+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8489 Comm: syz-fuzzer Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0033:0x41fa73 Code: 24 24 8b 74 24 20 48 8b 5c 24 18 48 8b 4c 24 50 48 8b 54 24 48 4c 8b 8c 24 90 00 00 00 4c 8b 94 24 98 00 00 00 e9 b3 fe ff ff <49> 89 cb eb 8d 48 8b 84 24 98 00 00 00 48 01 50 10 48 8b ac 24 80 RSP: 002b:000000c00004bea8 EFLAGS: 00000246 RAX: 0000000000203003 RBX: 00007f840c794b65 RCX: 0000000000000040 RDX: 0000000000000040 RSI: 0000000000000003 RDI: 0000000000000040 RBP: 000000c00004bf28 R08: 00007f840c8befff R09: 000000c00dab6c80 R10: 000000c00002d698 R11: 0000000000000038 R12: 000000c00da2b640 R13: 000000c000000f00 R14: 0000000000000002 R15: 0000000000000002 FS: 000000c000310410 GS: 0000000000000000