INFO: task syz.3.252:7730 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.252       state:D stack:21888 pid:7730  tgid:7729  ppid:6941   task_flags:0x440140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 page_cache_ra_order+0x38c/0xeb0
 filemap_get_pages+0x4c0/0x1f10
 filemap_splice_read+0x5cd/0xd10
 splice_direct_to_actor+0x478/0xc70
 do_splice_direct+0x1ef/0x310
 do_sendfile+0x535/0x7d0
 __se_sys_sendfile64+0x144/0x1a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b8139c799
RSP: 002b:00007f4b8233c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f4b81615fa0 RCX: 00007f4b8139c799
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005
RBP: 00007f4b81432c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4b81616038 R14: 00007f4b81615fa0 R15: 00007fffea4be918
 </TASK>
INFO: task syz.4.257:7788 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.257       state:D stack:27912 pid:7788  tgid:7786  ppid:7164   task_flags:0x440040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 page_cache_ra_order+0x38c/0xeb0
 filemap_get_pages+0x4c0/0x1f10
 filemap_splice_read+0x5cd/0xd10
 splice_direct_to_actor+0x478/0xc70
 do_splice_direct+0x1ef/0x310
 do_sendfile+0x535/0x7d0
 __se_sys_sendfile64+0x144/0x1a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f79dc79c799
RSP: 002b:00007f79dd6d0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f79dca16090 RCX: 00007f79dc79c799
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004
RBP: 00007f79dc832c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f79dca16128 R14: 00007f79dca16090 R15: 00007ffeada82858
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/0:0/9:
 #0: ffff88810006b148 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc900000e7c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88819ea0b240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
1 lock held by ksoftirqd/1/23:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/1:2/782:
2 locks held by getty/5632:
 #0: ffff88810d9160a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
3 locks held by kworker/0:6/5869:
 #0: ffff88810006b148 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90006a9fc40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88819d7a7240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
2 locks held by syz.0.248/7689:
1 lock held by syz.3.252/7730:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.4.257/7788:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.5.258/7833:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.6.262/7858:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.7.265/7918:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.8.269/8015:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.1.272/8130:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.9.274/8125:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.2.276/8246:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.3.284/8312:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.0.285/8313:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.4.289/8356:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.5.293/8434:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.6.316/8482:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.7.322/8526:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.8.326/8560:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.1.329/8589:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.2.357/8714:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.9.360/8722:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.3.365/8754:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.0.371/8817:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.4.372/8823:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.4.372/8830:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.5.378/8865:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0
1 lock held by syz.7.385/8934:
 #0: ffff888167cd0948 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x38c/0xeb0

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:pv_native_safe_halt+0xf/0x20
Code: 9e 6c 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d e3 f2 1a 00 fb f4 <e9> fc e9 02 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8e407dc0 EFLAGS: 00000206
RAX: 0000000000473203 RBX: ffffffff819a900a RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8def794e RDI: ffffffff8c27c200
RBP: ffffffff8e407eb0 R08: ffff88812103395b R09: 1ffff1102420672b
R10: dffffc0000000000 R11: ffffed102420672c R12: 0000000000000000
R13: 1ffffffff1c929d8 R14: 0000000000000000 R15: 1ffffffff1c929d8
FS:  0000000000000000(0000) GS:ffff88818de5d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdcc75e9e80 CR3: 000000017889a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 default_idle+0x9/0x20
 default_idle_call+0x72/0xb0
 do_idle+0x36a/0x5f0
 cpu_startup_entry+0x43/0x60
 rest_init+0x2de/0x300
 start_kernel+0x385/0x3d0
 x86_64_start_reservations+0x24/0x30
 x86_64_start_kernel+0x143/0x1c0
 common_startup_64+0x13e/0x147
 </TASK>
