netlink: 108 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 108 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 108 bytes leftover after parsing attributes in process `syz-executor.4'. nla_parse: 2 callbacks suppressed netlink: 108 bytes leftover after parsing attributes in process `syz-executor.4'. INFO: task syz-executor.4:8504 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.4 D27736 8504 8142 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: 0033:0x7f00edf13059 Code: Bad RIP value. RSP: 002b:00007f00ec888168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f00ee025f60 RCX: 00007f00edf13059 RDX: 00000000fffffecc RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007f00edf6d08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5940600f R14: 00007f00ec888300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 00000000bb6f8e0d (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7848: #0: 000000001f937932 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by agetty/8033: #0: 000000002f24cb20 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000006d0c5018 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154 1 lock held by syz-executor.4/8504: #0: 00000000ad04729e (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:77 [inline] #0: 00000000ad04729e (&pipe->mutex/1){+.+.}, at: pipe_lock fs/pipe.c:85 [inline] #0: 00000000ad04729e (&pipe->mutex/1){+.+.}, at: pipe_wait+0x1bd/0x1e0 fs/pipe.c:133 2 locks held by syz-executor.4/8512: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 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+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: 7 Comm: kworker/u4:0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:lock_acquire+0x157/0x3c0 kernel/locking/lockdep.c:3908 Code: 00 00 89 c0 48 0f a3 05 7f 8b db 09 0f 82 95 01 00 00 4c 8b 4c 24 08 44 89 ea 6a 00 48 89 ef 6a 00 45 89 f8 44 89 f1 44 89 e6 74 24 60 ff 74 24 18 49 c1 e9 09 49 83 f1 01 41 83 e1 01 e8 d0 RSP: 0018:ffff8880b5a47c48 EFLAGS: 00000086 RAX: 0000000000000000 RBX: ffff8880b5a361c0 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff89f85fa0 RBP: ffffffff89f85fa0 R08: 0000000000000000 R09: 0000000000000286 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff275a8a000 CR3: 00000000a12d5000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:627 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:419 [inline] batadv_nc_worker+0x12d/0xd50 net/batman-adv/network-coding.c:730 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 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 89 c0 mov %eax,%eax 4: 48 0f a3 05 7f 8b db bt %rax,0x9db8b7f(%rip) # 0x9db8b8b b: 09 c: 0f 82 95 01 00 00 jb 0x1a7 12: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 17: 44 89 ea mov %r13d,%edx 1a: 6a 00 pushq $0x0 1c: 48 89 ef mov %rbp,%rdi 1f: 6a 00 pushq $0x0 21: 45 89 f8 mov %r15d,%r8d 24: 44 89 f1 mov %r14d,%ecx 27: 44 89 e6 mov %r12d,%esi * 2a: ff 74 24 60 pushq 0x60(%rsp) <-- trapping instruction 2e: ff 74 24 18 pushq 0x18(%rsp) 32: 49 c1 e9 09 shr $0x9,%r9 36: 49 83 f1 01 xor $0x1,%r9 3a: 41 83 e1 01 and $0x1,%r9d 3e: e8 .byte 0xe8 3f: d0 .byte 0xd0