netlink: 44 bytes leftover after parsing attributes in process `syz-executor.5'. INFO: task syz-executor.0:3093 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29168 3093 8172 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1016 [inline] __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078 pipe_lock_nested fs/pipe.c:77 [inline] pipe_lock fs/pipe.c:85 [inline] pipe_wait+0x1bd/0x1e0 fs/pipe.c:133 pipe_write+0x5c3/0xf80 fs/pipe.c:500 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f360ab855f9 Code: Bad RIP value. RSP: 002b:00007f36094d7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f360aca6050 RCX: 00007f360ab855f9 RDX: 00000000fffffecc RSI: 0000000020000000 RDI: 0000000000000056 RBP: 00007f360abe07b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc0e9a500f R14: 00007f36094d7300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1569: #0: 00000000f348a00a (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7818: #0: 000000000e0ee14b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor.0/3093: #0: 000000008abd3407 (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:77 [inline] #0: 000000008abd3407 (&pipe->mutex/1){+.+.}, at: pipe_lock fs/pipe.c:85 [inline] #0: 000000008abd3407 (&pipe->mutex/1){+.+.}, at: pipe_wait+0x1bd/0x1e0 fs/pipe.c:133 2 locks held by syz-executor.0/3096: #0: 000000008abd3407 (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:77 [inline] #0: 000000008abd3407 (&pipe->mutex/1){+.+.}, at: pipe_lock fs/pipe.c:85 [inline] #0: 000000008abd3407 (&pipe->mutex/1){+.+.}, at: pipe_wait+0x1bd/0x1e0 fs/pipe.c:133 #1: 00000000b6aef61c (&table[i].mutex){+.+.}, at: nfnl_lock net/netfilter/nfnetlink.c:62 [inline] #1: 00000000b6aef61c (&table[i].mutex){+.+.}, at: nfnetlink_rcv_msg+0x98d/0xf60 net/netfilter/nfnetlink.c:228 1 lock held by syz-executor.0/4891: #0: 00000000bc3cda7e (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:98 [inline] #0: 00000000bc3cda7e (&pipe->mutex/1){+.+.}, at: pipe_release+0x49/0x340 fs/pipe.c:593 1 lock held by syz-executor.0/4895: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1569 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6869 Comm: kworker/u4:9 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Workqueue: bat_events batadv_nc_worker RIP: 0010:__lock_release kernel/locking/lockdep.c:3714 [inline] RIP: 0010:lock_release+0x523/0x8b0 kernel/locking/lockdep.c:3927 Code: 00 4c 8b 33 4d 85 f6 75 bf 65 ff 0d 57 90 b6 7e 0f 85 49 fc ff ff e8 2e ee b4 ff e9 3f fc ff ff 48 b8 00 00 00 00 00 fc ff df <48> 8b 54 24 08 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 16 RSP: 0018:ffff888053b5fb80 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 1ffff11008958593 RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff888044ac23c0 RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1100a76bf73 R13: 44e964d3e27bd066 R14: ffff888044ac23c0 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5049e15000 CR3: 00000000a11e6000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:174 [inline] _raw_spin_unlock_bh+0x17/0x30 kernel/locking/spinlock.c:200 spin_unlock_bh include/linux/spinlock.h:374 [inline] batadv_nc_purge_paths+0x22d/0x310 net/batman-adv/network-coding.c:482 batadv_nc_worker+0x6fa/0xd50 net/batman-adv/network-coding.c:731 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415