INFO: task syz-executor.0:18532 can't die for more than 143 seconds. task:syz-executor.0 state:D stack:29168 pid:18532 ppid: 16540 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 kernel/locking/rwsem.c:1407 register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1821 raw_init+0x296/0x340 net/can/raw.c:337 can_create+0x27c/0x4d0 net/can/af_can.c:168 __sock_create+0x3de/0x780 net/socket.c:1406 sock_create net/socket.c:1457 [inline] __sys_socketpair+0x1be/0x570 net/socket.c:1557 __do_sys_socketpair net/socket.c:1610 [inline] __se_sys_socketpair net/socket.c:1607 [inline] __x64_sys_socketpair+0x93/0xf0 net/socket.c:1607 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e299 RSP: 002b:00007f8ae0acac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e299 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000119bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000200001c0 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffc4c9f06af R14: 00007f8ae0acb9c0 R15: 000000000119bf8c INFO: task syz-executor.0:18532 blocked for more than 143 seconds. Not tainted 5.10.0-next-20201223-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:29168 pid:18532 ppid: 16540 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 kernel/locking/rwsem.c:1407 register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1821 raw_init+0x296/0x340 net/can/raw.c:337 can_create+0x27c/0x4d0 net/can/af_can.c:168 __sock_create+0x3de/0x780 net/socket.c:1406 sock_create net/socket.c:1457 [inline] __sys_socketpair+0x1be/0x570 net/socket.c:1557 __do_sys_socketpair net/socket.c:1610 [inline] __se_sys_socketpair net/socket.c:1607 [inline] __x64_sys_socketpair+0x93/0xf0 net/socket.c:1607 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e299 RSP: 002b:00007f8ae0acac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e299 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000119bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000200001c0 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffc4c9f06af R14: 00007f8ae0acb9c0 R15: 000000000119bf8c INFO: task syz-executor.0:18557 can't die for more than 144 seconds. task:syz-executor.0 state:D stack:29640 pid:18557 ppid: 16540 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 kernel/locking/rwsem.c:1407 register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1821 raw_init+0x296/0x340 net/can/raw.c:337 can_create+0x27c/0x4d0 net/can/af_can.c:168 __sock_create+0x3de/0x780 net/socket.c:1406 sock_create net/socket.c:1457 [inline] __sys_socketpair+0x1be/0x570 net/socket.c:1557 __do_sys_socketpair net/socket.c:1610 [inline] __se_sys_socketpair net/socket.c:1607 [inline] __x64_sys_socketpair+0x93/0xf0 net/socket.c:1607 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e299 RSP: 002b:00007f8ae0aa9c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e299 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000119c070 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000200001c0 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffc4c9f06af R14: 00007f8ae0aaa9c0 R15: 000000000119c034 INFO: task syz-executor.0:18557 blocked for more than 144 seconds. Not tainted 5.10.0-next-20201223-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:29640 pid:18557 ppid: 16540 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 kernel/locking/rwsem.c:1407 register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1821 raw_init+0x296/0x340 net/can/raw.c:337 can_create+0x27c/0x4d0 net/can/af_can.c:168 __sock_create+0x3de/0x780 net/socket.c:1406 sock_create net/socket.c:1457 [inline] __sys_socketpair+0x1be/0x570 net/socket.c:1557 __do_sys_socketpair net/socket.c:1610 [inline] __se_sys_socketpair net/socket.c:1607 [inline] __x64_sys_socketpair+0x93/0xf0 net/socket.c:1607 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e299 RSP: 002b:00007f8ae0aa9c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e299 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 000000000119c070 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000200001c0 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffc4c9f06af R14: 00007f8ae0aaa9c0 R15: 000000000119c034 Showing all locks held in the system: 3 locks held by kworker/u4:5/229: 3 locks held by kworker/u4:6/325: 1 lock held by khungtaskd/1661: #0: ffffffff8b363660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8181: #0: ffff888017f5d9f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:949 2 locks held by agetty/8188: #0: ffff88801acc9098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266 #1: ffffc900011c82e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x21d/0x1aa0 drivers/tty/n_tty.c:2158 1 lock held by syz-executor.0/18532: #0: ffffffff8c938c50 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1821 1 lock held by syz-executor.0/18557: #0: ffffffff8c938c50 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0x1e/0x260 net/core/dev.c:1821 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1661 Comm: khungtaskd Not tainted 5.10.0-next-20201223-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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 325 Comm: kworker/u4:6 Not tainted 5.10.0-next-20201223-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:__raw_callee_save___pv_queued_spin_unlock+0xc/0x12 Code: 56 57 41 50 41 51 41 52 41 53 e8 8f 15 00 00 41 5b 41 5a 41 59 41 58 5f 5e 5a 59 c3 66 90 52 b8 01 00 00 00 31 d2 f0 0f b0 17 <3c> 01 75 02 5a c3 56 0f b6 f0 e8 c5 ff ff ff 5e 5a c3 66 90 48 b8 RSP: 0018:ffffc900018cfbe0 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81594270 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880219cc880 RBP: ffff8880219cc880 R08: 0000000000000000 R09: ffff8880219cc883 R10: ffffed1004339910 R11: 0000000000000000 R12: ffff8880219cc888 R13: ffff8880219cc890 R14: dffffc0000000000 R15: ffffffff88964990 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f757923a000 CR3: 0000000022a73000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:559 [inline] queued_spin_unlock arch/x86/include/asm/qspinlock.h:56 [inline] do_raw_spin_unlock+0x171/0x230 kernel/locking/spinlock_debug.c:139 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:175 [inline] _raw_spin_unlock_bh+0x1a/0x30 kernel/locking/spinlock.c:207 spin_unlock_bh include/linux/spinlock.h:399 [inline] batadv_nc_purge_paths+0x2a5/0x3a0 net/batman-adv/network-coding.c:467 batadv_nc_worker+0x831/0xe50 net/batman-adv/network-coding.c:716 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296