INFO: task syz-executor.4:22039 can't die for more than 143 seconds. syz-executor.4 D28360 22039 6861 0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x163/0x260 kernel/sched/completion.c:138 __flush_work+0x51f/0xab0 kernel/workqueue.c:3046 __cancel_work_timer+0x5de/0x700 kernel/workqueue.c:3133 tls_sk_proto_close+0x4a7/0xaf0 net/tls/tls_main.c:305 inet_release+0x12e/0x280 net/ipv4/af_inet.c:431 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:475 __sock_release+0xcd/0x280 net/socket.c:596 sock_close+0x18/0x20 net/socket.c:1277 __fput+0x285/0x920 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:135 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:139 [inline] exit_to_user_mode_prepare+0x195/0x1c0 kernel/entry/common.c:166 syscall_exit_to_user_mode+0x59/0x2b0 kernel/entry/common.c:241 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416b81 Code: Bad RIP value. RSP: 002b:00007ffedaaf5920 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000416b81 RDX: 0000000000000000 RSI: 0000000000000be4 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00000000f2ab2be2 R09: 00000000f2ab2be6 R10: 00007ffedaaf5a10 R11: 0000000000000293 R12: 000000000118d940 R13: 000000000118d940 R14: ffffffffffffffff R15: 000000000118cf4c INFO: task syz-executor.4:22039 blocked for more than 143 seconds. Not tainted 5.8.0-next-20200814-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28360 22039 6861 0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x163/0x260 kernel/sched/completion.c:138 __flush_work+0x51f/0xab0 kernel/workqueue.c:3046 __cancel_work_timer+0x5de/0x700 kernel/workqueue.c:3133 tls_sk_proto_close+0x4a7/0xaf0 net/tls/tls_main.c:305 inet_release+0x12e/0x280 net/ipv4/af_inet.c:431 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:475 __sock_release+0xcd/0x280 net/socket.c:596 sock_close+0x18/0x20 net/socket.c:1277 __fput+0x285/0x920 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:135 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:139 [inline] exit_to_user_mode_prepare+0x195/0x1c0 kernel/entry/common.c:166 syscall_exit_to_user_mode+0x59/0x2b0 kernel/entry/common.c:241 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x416b81 Code: Bad RIP value. RSP: 002b:00007ffedaaf5920 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000416b81 RDX: 0000000000000000 RSI: 0000000000000be4 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00000000f2ab2be2 R09: 00000000f2ab2be6 R10: 00007ffedaaf5a10 R11: 0000000000000293 R12: 000000000118d940 R13: 000000000118d940 R14: ffffffffffffffff R15: 000000000118cf4c Showing all locks held in the system: 1 lock held by khungtaskd/1165: #0: ffffffff89c66c40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5825 1 lock held by in:imklog/6547: #0: ffff88809f2578f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 2 locks held by agetty/6565: #0: ffff8880a1f98098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc900025d12e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 3 locks held by kworker/1:3/7601: #0: ffff8880aa063d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa063d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8880aa063d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8880aa063d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8880aa063d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8880aa063d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc90008eb7da8 ((work_completion)(&(&sw_ctx_tx->tx_work.work)->work)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 #2: ffff888099161cd8 (&ctx->tx_lock){+.+.}-{3:3}, at: tx_work_handler+0x127/0x190 net/tls/tls_sw.c:2251 1 lock held by syz-executor.3/31922: #0: ffff8880a237ae20 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1583 [inline] #0: ffff8880a237ae20 (sk_lock-AF_INET6){+.+.}-{0:0}, at: sctp_getsockopt net/sctp/socket.c:7820 [inline] #0: ffff8880a237ae20 (sk_lock-AF_INET6){+.+.}-{0:0}, at: sctp_getsockopt+0x249/0x6d0a net/sctp/socket.c:7793 1 lock held by syz-executor.4/22039: #0: ffff8880855f7210 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:780 [inline] #0: ffff8880855f7210 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:595 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1165 Comm: khungtaskd Not tainted 5.8.0-next-20200814-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+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 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:339 kthread+0x3b5/0x4a0 kernel/kthread.c:292 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: 3891 Comm: systemd-journal Not tainted 5.8.0-next-20200814-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0033:0x558c52df8321 Code: 3b 44 24 78 0f 85 de 00 00 00 45 31 ed 45 31 e4 e9 f7 fe ff ff 4c 89 fe 48 8b 5c 24 10 44 89 ed e9 d8 fb ff ff e8 2f 31 ff ff <31> ed e9 1c fd ff ff 4c 8b 64 24 60 4d 85 e4 0f 84 bf 00 00 00 48 RSP: 002b:00007ffc87c71ea0 EFLAGS: 00000246 RAX: 00007ffc87c72780 RBX: 00007ffc87c74910 RCX: 000000000000004e RDX: 00007ffc87c72781 RSI: 000000000000000a RDI: 00007ffc87c72780 RBP: 00007ffc87c72718 R08: 00007ffc87c72722 R09: 0000000000000000 R10: 0000000000000000 R11: 00007f22fccae040 R12: 0000000000000000 R13: 000000000000004f R14: 0000558c52dfb958 R15: 0005acdcf22a81cb FS: 00007f22fd9818c0 GS: 0000000000000000