INFO: task syz.8.787:15680 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.787       state:D stack:26008 pid:15680 tgid:15679 ppid:14766  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5504 [inline]
 __schedule+0x16dc/0x5500 kernel/sched/core.c:7228
 __schedule_loop kernel/sched/core.c:7307 [inline]
 rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7603
 rt_mutex_slowlock_block kernel/locking/rtmutex.c:1670 [inline]
 __rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
 __rt_mutex_slowlock_locked+0x1f84/0x25b0 kernel/locking/rtmutex.c:1787
 __rwbase_read_lock+0xc3/0x180 kernel/locking/rwbase_rt.c:114
 rwbase_read_lock kernel/locking/rwbase_rt.c:147 [inline]
 __down_read kernel/locking/rwsem.c:1502 [inline]
 down_read+0x132/0x200 kernel/locking/rwsem.c:1576
 __super_lock fs/super.c:60 [inline]
 super_lock+0x2d6/0x3d0 fs/super.c:122
 user_get_super+0xc8/0x120 fs/super.c:941
 quotactl_block fs/quota/quota.c:889 [inline]
 __do_sys_quotactl fs/quota/quota.c:955 [inline]
 __se_sys_quotactl+0x538/0x9a0 fs/quota/quota.c:917
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f798b18ce59
RSP: 002b:00007f79893de02[  650.981174][   T37] RSP: 002b:00007f79893de028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f798b405fa0 RCX: 00007f798b18ce59
RDX: 0000000000000000 RSI: 0000200000000340 RDI: ffffffff80000800
RBP: 00007f798b222e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000080 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f798b406038 R14: 00007f798b405fa0 R15: 00007ffc762f7768
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
 nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xfd7/0x1030 kernel/hung_task.c:561
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 18787 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__refcount_add_not_zero include/linux/refcount.h:-1 [inline]
RIP: 0010:refcount_add_not_zero include/linux/refcount.h:212 [inline]
RIP: 0010:__vma_start_exclude_readers+0x174/0x930 mm/mmap_lock.c:120
Code: 4c 89 ef be 04 00 00 00 e8 69 1a 1a 00 4c 89 e8 48 c1 e8 03 48 89 44 24 78 42 0f b6 04 38 84 c0 0f 85 44 07 00 00 45 8b 75 00 <44> 89 b4 24 a0 00 00 00 31 ff 44 89 f6 e8 3a b2 b0 ff 45 85 f6 0f
RSP: 0018:ffffc900043077a0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88804ec9cc80 RCX: ffffffff821449d7
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88804ec9cd00
RBP: ffffc900043078a8 R08: ffff88804ec9cd03 R09: 1ffff11009d939a0
R10: dffffc0000000000 R11: ffffed1009d939a1 R12: 1ffff92000860f04
R13: ffff88804ec9cd00 R14: 0000000000000001 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888126242000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31f0eff8 CR3: 0000000035c7e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __vma_start_write+0xdc/0x290 mm/mmap_lock.c:148
 vma_start_write include/linux/mmap_lock.h:303 [inline]
 free_pgtables+0x824/0xb70 mm/memory.c:413
 exit_mmap+0x4aa/0x9f0 mm/mmap.c:1312
 __mmput+0xcb/0x3d0 kernel/fork.c:1182
 exit_mm+0x186/0x240 kernel/exit.c:610
 do_exit+0x6cd/0x2360 kernel/exit.c:992
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1147
 __do_sys_exit_group kernel/exit.c:1158 [inline]
 __se_sys_exit_group kernel/exit.c:1156 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1156
 x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb0180d16c5
Code: Unable to access opcode bytes at 0x7fb0180d169b.
RSP: 002b:00007ffd67246948 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007ffd67246c04 RCX: 00007fb0180d16c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000000
RBP: 0000000000000003 R08: 00007ffd67246a40 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffd67246c80 R14: 00007fb0182e1000 R15: 000055e9cedb3d98
 </TASK>