INFO: task syz.7.2051:13714 blocked for more than 146 seconds.
      Tainted: G             L      syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.2051      state:D stack:26384 pid:13714 tgid:13711 ppid:12467  task_flags:0x40044c flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5520 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7270
 __schedule_loop kernel/sched/core.c:7347 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7362
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7419
 rwsem_down_read_slowpath+0x6ba/0x920 kernel/locking/rwsem.c:1114
 __down_read_common kernel/locking/rwsem.c:1291 [inline]
 __down_read kernel/locking/rwsem.c:1304 [inline]
 down_read+0x9c/0x330 kernel/locking/rwsem.c:1576
 mmap_read_lock include/linux/mmap_lock.h:600 [inline]
 exit_mm+0x111/0x2d0 kernel/exit.c:590
 do_exit+0x6cd/0x2360 kernel/exit.c:996
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1151
 get_signal+0x121b/0x12c0 kernel/signal.c:3039
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f588e19e159
RSP: 002b:00007f588f0af0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f588e426188 RCX: 00007f588e19e159
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f588e426188
RBP: 00007f588e426180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f588e426218 R14: 00007f588e54f960 R15: 00007f588e54fa48
 </TASK>
INFO: task syz.7.2051:13717 blocked for more than 146 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.2051      state:D stack:22896 pid:13717 tgid:13711 ppid:12467  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5520 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7270
 __schedule_loop kernel/sched/core.c:7347 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7362
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7419
 rwsem_down_read_slowpath+0x6ba/0x920 kernel/locking/rwsem.c:1114
 __down_read_common kernel/locking/rwsem.c:1291 [inline]
 __down_read kernel/locking/rwsem.c:1304 [inline]
 down_read+0x9c/0x330 kernel/locking/rwsem.c:1576
 mmap_read_lock include/linux/mmap_lock.h:600 [inline]
 madvise_lock+0x152/0x2e0 mm/madvise.c:1781
 do_madvise+0x283/0x3a0 mm/madvise.c:2002
 __do_sys_madvise mm/madvise.c:2015 [inline]
 __se_sys_madvise mm/madvise.c:2013 [inline]
 __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2013
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f588e19e159
RSP: 002b:00007f588f06d028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f588e426360 RCX: 00007f588e19e159
RDX: 0000000000000015 RSI: 7fffffffffffffff RDI: 0000200000000000
RBP: 00007f588e235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f588e4263f8 R14: 00007f588e426360 R15: 00007f588e54fa48
 </TASK>

Showing all locks held in the system:
locks held by kworker/0:0/9: 3, on CPU#0: