INFO: task syz-executor.1:11637 blocked for more than 143 seconds. Not tainted 5.2.0+ #67 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D25992 11637 32625 0x00000004 Call Trace: context_switch /kernel/sched/core.c:3254 [inline] __schedule+0x755/0x1580 /kernel/sched/core.c:3880 schedule+0xa8/0x270 /kernel/sched/core.c:3944 exp_funnel_lock /kernel/rcu/tree_exp.h:308 [inline] synchronize_rcu_expedited+0x544/0x5b0 /kernel/rcu/tree_exp.h:816 synchronize_net+0x3b/0x60 /net/core/dev.c:9259 packet_set_ring+0x23c/0x1b60 /net/packet/af_packet.c:4370 packet_setsockopt+0x530/0x2df0 /net/packet/af_packet.c:3682 __sys_setsockopt+0x261/0x4c0 /net/socket.c:2084 __do_sys_setsockopt /net/socket.c:2100 [inline] __se_sys_setsockopt /net/socket.c:2097 [inline] __x64_sys_setsockopt+0xbe/0x150 /net/socket.c:2097 do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459819 Code: 9b 00 00 00 48 83 ec 68 48 89 6c 24 60 48 8d 6c 24 60 48 8b 42 08 48 8b 4a 10 48 8b 5a 18 48 8b 72 20 48 8b 7a 28 48 8b 3f 4c <8b> 42 30 48 8b 52 38 48 85 d2 76 62 48 89 44 24 58 4c 89 44 24 28 RSP: 002b:00007f7124a16c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459819 RDX: 0000000000000005 RSI: 0000000000000107 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 000000000000001c R09: 0000000000000000 R10: 0000000020000080 R11: 0000000000000246 R12: 00007f7124a176d4 R13: 00000000004c80ba R14: 00000000004de7a0 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1054: #0: 00000000a46fda56 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e /kernel/locking/lockdep.c:5257 1 lock held by rsyslogd/8809: 2 locks held by getty/8899: #0: 00000000cf471d24 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 0000000054ce916e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8900: #0: 000000004ae9259d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000a463a9c9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8901: #0: 00000000f91e2112 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000b47e45b5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8902: #0: 0000000034e60db1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 000000005d1a569a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8903: #0: 00000000b759c76b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 0000000040c990d5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8904: #0: 000000003b2ffad9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 0000000098ffceff (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 2 locks held by getty/8905: #0: 000000003d042d66 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:341 #1: 00000000dda75706 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 /drivers/tty/n_tty.c:2156 1 lock held by syz-executor.1/11637: #0: 000000001a257cb3 (sk_lock-AF_PACKET){+.+.}, at: lock_sock /./include/net/sock.h:1522 [inline] #0: 000000001a257cb3 (sk_lock-AF_PACKET){+.+.}, at: packet_setsockopt+0x447/0x2df0 /net/packet/af_packet.c:3665 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1054 Comm: khungtaskd Not tainted 5.2.0+ #67 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+0x70/0xb2 /lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b /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:205 [inline] watchdog+0x9d0/0xef0 /kernel/hung_task.c:289 kthread+0x361/0x430 /kernel/kthread.c:255 ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 /./arch/x86/include/asm/irqflags.h:60