INFO: task syz-executor.0:21298 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.0 D28384 21298 31541 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: 0033:0x459829 Code: 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 48 89 0c 24 48 89 5c 24 08 48 c7 44 24 10 00 00 RSP: 002b:00007f603cda2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459829 RDX: 0000000000000005 RSI: 0000000000000107 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 000000000000001c R09: 0000000000000000 R10: 00000000200001c0 R11: 0000000000000246 R12: 00007f603cda36d4 R13: 00000000004c8212 R14: 00000000004dea68 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1054: #0: 0000000005e1fae3 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5257 1 lock held by rsyslogd/9105: #0: 00000000d40f6fc7 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/9195: #0: 00000000cca984d3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000005df11297 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9196: #0: 000000004a3743e6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006a0fea1b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9197: #0: 00000000dd44dde9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000009548fc03 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9198: #0: 000000008ada03b6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000056252bb6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9199: #0: 000000001d62c8f1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000005262e42d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9200: #0: 0000000092f70485 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000000907346c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 2 locks held by getty/9201: #0: 000000001c73578d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000a33f9b3a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/21298: #0: 000000009a98b9fa (sk_lock-AF_PACKET){+.+.}, at: lock_sock include/net/sock.h:1522 [inline] #0: 000000009a98b9fa (sk_lock-AF_PACKET){+.+.}, at: packet_setsockopt+0x447/0x2df0 net/packet/af_packet.c:3665 ============================================= NMI backtrace for cpu 1 CPU: 1 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 26751 Comm: kworker/u4:0 Not tainted 5.2.0+ #67 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:__kasan_check_read+0x8/0x20 mm/kasan/common.c:92 Code: 8b 4d d0 e9 27 ee ff ff 48 8b 73 58 89 c2 48 c7 c7 f0 b5 88 88 f7 da e8 2a bc af ff e9 da ee ff ff 90 55 89 f6 31 d2 48 89 e5 <48> 8b 4d 08 e8 cf 26 00 00 5d c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 RSP: 0018:ffff888067bffbf8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff89a4f7b8 RBP: ffff888067bffbf8 R08: 0000000000000000 R09: 0000000000000000 R10: fffffbfff1349ef7 R11: ffffffff89a4f7bf R12: ffffffff88dabf80 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000a1236000 CR4: 00000000001406f0 Call Trace: test_bit include/asm-generic/bitops-instrumented.h:237 [inline] cpumask_test_cpu include/linux/cpumask.h:344 [inline] trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x150/0x410 kernel/locking/lockdep.c:4412 rcu_lock_acquire include/linux/rcupdate.h:208 [inline] rcu_read_lock include/linux/rcupdate.h:592 [inline] batadv_nc_process_nc_paths.part.0+0xe4/0x3c0 net/batman-adv/network-coding.c:686 batadv_nc_process_nc_paths net/batman-adv/network-coding.c:678 [inline] batadv_nc_worker+0x550/0x760 net/batman-adv/network-coding.c:727 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352