INFO: task syz-executor.1:21058 blocked for more than 143 seconds. Not tainted 5.1.0+ #10 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28128 21058 9013 0x00000004 Call Trace: context_switch kernel/sched/core.c:2817 [inline] __schedule+0x7cb/0x1560 kernel/sched/core.c:3444 schedule+0xa8/0x260 kernel/sched/core.c:3508 exp_funnel_lock kernel/rcu/tree_exp.h:309 [inline] synchronize_rcu_expedited+0x54e/0x5b0 kernel/rcu/tree_exp.h:790 synchronize_net+0x3b/0x60 net/core/dev.c:9279 packet_release+0x806/0xbf0 net/packet/af_packet.c:3015 __sock_release+0xce/0x2a0 net/socket.c:607 sock_close+0x1b/0x30 net/socket.c:1279 __fput+0x2ff/0x890 fs/file_table.c:279 ____fput+0x16/0x20 fs/file_table.c:312 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:168 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x412b61 Code: 01 00 00 64 48 8b 04 25 f8 ff ff ff 48 8b 40 30 48 8b 80 98 00 00 00 48 85 c0 74 15 48 8b 08 48 39 d1 77 0d 48 8b 40 08 48 39 0f 82 fb 00 00 00 48 8b 05 b1 b8 37 01 48 85 c0 0f 84 e2 00 00 RSP: 002b:00007fffc7ea1530 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000412b61 RDX: 0000000000000000 RSI: ffffffff87172f18 RDI: 0000000000000005 RBP: 0000000000000001 R08: ffffffff8132c03c R09: 000000005510f3c5 R10: 00007fffc7ea1610 R11: 0000000000000293 R12: 000000000073c900 R13: 000000000073c900 R14: 000000000006d1b9 R15: 000000000073bfac INFO: task syz-executor.4:21059 blocked for more than 143 seconds. Not tainted 5.1.0+ #10 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28016 21059 13388 0x00000004 Call Trace: context_switch kernel/sched/core.c:2817 [inline] __schedule+0x7cb/0x1560 kernel/sched/core.c:3444 schedule+0xa8/0x260 kernel/sched/core.c:3508 exp_funnel_lock kernel/rcu/tree_exp.h:309 [inline] synchronize_rcu_expedited+0x54e/0x5b0 kernel/rcu/tree_exp.h:790 synchronize_net+0x3b/0x60 net/core/dev.c:9279 packet_release+0x806/0xbf0 net/packet/af_packet.c:3015 __sock_release+0xce/0x2a0 net/socket.c:607 sock_close+0x1b/0x30 net/socket.c:1279 __fput+0x2ff/0x890 fs/file_table.c:279 ____fput+0x16/0x20 fs/file_table.c:312 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:168 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x412b61 Code: 01 00 00 64 48 8b 04 25 f8 ff ff ff 48 8b 40 30 48 8b 80 98 00 00 00 48 85 c0 74 15 48 8b 08 48 39 d1 77 0d 48 8b 40 08 48 39 0f 82 fb 00 00 00 48 8b 05 b1 b8 37 01 48 85 c0 0f 84 e2 00 00 RSP: 002b:00007fff0e35a080 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000412b61 RDX: 0000000000000000 RSI: 00000000000013c1 RDI: 0000000000000005 RBP: 0000000000000001 R08: 000000005510f3c1 R09: 000000005510f3c5 R10: 00007fff0e35a160 R11: 0000000000000293 R12: 000000000073c900 R13: 000000000073c900 R14: 000000000006d178 R15: 000000000073bfac Showing all locks held in the system: 1 lock held by khungtaskd/1041: #0: 0000000000405f1d (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5148 1 lock held by rsyslogd/8881: #0: 00000000fad8980b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8971: #0: 00000000aa0ee3bd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000081d6a240 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8972: #0: 0000000003853cd1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000001bc2317b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8973: #0: 00000000349e0d55 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000000590621d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8974: #0: 00000000eaa41f38 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000c3e18003 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8975: #0: 00000000b21e2804 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000be2bcd43 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8976: #0: 00000000cd9138f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000b57555cc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8977: #0: 00000000f306e863 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000336a5c29 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.1/21058: #0: 00000000abcf1b45 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:778 [inline] #0: 00000000abcf1b45 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x89/0x2a0 net/socket.c:606 1 lock held by syz-executor.4/21059: #0: 000000004e81f98a (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:778 [inline] #0: 000000004e81f98a (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x89/0x2a0 net/socket.c:606 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1041 Comm: khungtaskd Not tainted 5.1.0+ #10 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0x9b7/0xec0 kernel/hung_task.c:288 kthread+0x354/0x420 kernel/kthread.c:253 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.1.0+ #10 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lockdep_hardirqs_off+0x7/0x2d0 kernel/locking/lockdep.c:3271 Code: a3 48 c7 c7 f0 8d 80 89 e8 c6 71 51 00 e9 a1 fe ff ff 48 c7 c7 f0 8d 80 89 e8 b5 71 51 00 e9 13 fe ff ff 48 c7 c0 f4 8d 80 89 <55> 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 89 e5 41 55 83 e0 07 RSP: 0018:ffff8880ae809f50 EFLAGS: 00000093 RAX: ffffffff89808df4 RBX: 0000000000000000 RCX: ffffffff8175eb83 RDX: 0000000000000000 RSI: ffffffff8175eb8c RDI: ffffffff8100660f RBP: ffff8880ae809f88 R08: ffffffff88a7a100 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff872008a5 R13: 0000000000000000 R14: ffffffff8100660f R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f86f9d43140 CR3: 0000000089ac5000 CR4: 00000000001406f0 DR0: fffffffffffffff7 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: trace_hardirqs_off_thunk+0x1a/0x1c interrupt_entry+0xb5/0xd0 arch/x86/entry/entry_64.S:565 RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61 Code: ff ff 48 89 df e8 52 44 8e fa eb 82 e9 07 00 00 00 0f 00 2d 54 3a 4d 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 44 3a 4d 00 fb f4 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 8e ee 43 fa e8 39 RSP: 0018:ffffffff88a07cf8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02 RAX: 1ffffffff1164e19 RBX: ffffffff88a7a100 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff88a7a97c RBP: ffffffff88a07d28 R08: ffffffff88a7a100 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff88b270b8 R14: 0000000000000000 R15: 0000000000000000 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:571 default_idle_call+0x36/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x377/0x560 kernel/sched/idle.c:262 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:353 rest_init+0x245/0x37b init/main.c:450 arch_call_rest_init+0xe/0x1b start_kernel+0x854/0x893 init/main.c:760 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470 x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243