syzbot

INFO: task syz-executor171:5873 blocked for more than 143 seconds.
      Not tainted 6.15.0-rc3-syzkaller-00032-ga79be02bba5c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor171 state:D stack:29440 pid:5873  tgid:5854  ppid:5849   task_flags:0x400040 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
 rwsem_down_write_slowpath+0xedd/0x1420 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1da/0x220 kernel/locking/rwsem.c:1578
 __super_lock fs/super.c:56 [inline]
 super_lock+0x19b/0x400 fs/super.c:120
 user_get_super+0xd2/0x180 fs/super.c:1000
 quotactl_block fs/quota/quota.c:890 [inline]
 __do_sys_quotactl fs/quota/quota.c:955 [inline]
 __se_sys_quotactl+0x527/0xa40 fs/quota/quota.c:917
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2e4f273c89
RSP: 002b:00007f2e4f207218 EFLAGS: 00000246
 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f2e4f3016d8 RCX: 00007f2e4f273c89
RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000202
RBP: 00007f2e4f3016d0 R08: 00007ffd55b33f67 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000
R13: 6f6f6c2f7665642f R14: 000020000000002c R15: 0000200000000010
 </TASK>
INFO: task syz-executor171:5871 blocked for more than 145 seconds.
      Not tainted 6.15.0-rc3-syzkaller-00032-ga79be02bba5c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor171 state:D stack:28376 pid:5871  tgid:5855  ppid:5851   task_flags:0x400040 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
 rwsem_down_write_slowpath+0xedd/0x1420 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1da/0x220 kernel/locking/rwsem.c:1578
 __super_lock fs/super.c:56 [inline]
 super_lock+0x19b/0x400 fs/super.c:120
 user_get_super+0xd2/0x180 fs/super.c:1000
 quotactl_block fs/quota/quota.c:890 [inline]
 __do_sys_quotactl fs/quota/quota.c:955 [inline]
 __se_sys_quotactl+0x527/0xa40 fs/quota/quota.c:917
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2e4f273c89
RSP: 002b:00007f2e4f207218 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f2e4f3016d8 RCX: 00007f2e4f273c89
RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000202
RBP: 00007f2e4f3016d0 R08: 00007ffd55b33f67 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000
R13: 6f6f6c2f7665642f R14: 000020000000002c R15: 0000200000000010
 </TASK>
INFO: task syz-executor171:5869 blocked for more than 146 seconds.
      Not tainted 6.15.0-rc3-syzkaller-00032-ga79be02bba5c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor171 state:D
 stack:28880 pid:5869  tgid:5856  ppid:5850   task_flags:0x400040 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
 rwsem_down_write_slowpath+0xedd/0x1420 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1da/0x220 kernel/locking/rwsem.c:1578
 __super_lock fs/super.c:56 [inline]
 super_lock+0x19b/0x400 fs/super.c:120
 user_get_super+0xd2/0x180 fs/super.c:1000
 quotactl_block fs/quota/quota.c:890 [inline]
 __do_sys_quotactl fs/quota/quota.c:955 [inline]
 __se_sys_quotactl+0x527/0xa40 fs/quota/quota.c:917
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2e4f273c89
RSP: 002b:00007f2e4f207218 EFLAGS: 00000246
 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f2e4f3016d8 RCX: 00007f2e4f273c89
RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000202
RBP: 00007f2e4f3016d0 R08: 00007ffd55b33f67 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000
R13: 6f6f6c2f7665642f R14: 000020000000002c R15: 0000200000000010
 </TASK>
INFO: task syz-executor171:5872 blocked for more than 148 seconds.
      Not tainted 6.15.0-rc3-syzkaller-00032-ga79be02bba5c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor171 state:D
 stack:29440 pid:5872  tgid:5858  ppid:5852   task_flags:0x400040 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
 rwsem_down_write_slowpath+0xedd/0x1420 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1da/0x220 kernel/locking/rwsem.c:1578
 __super_lock fs/super.c:56 [inline]
 super_lock+0x19b/0x400 fs/super.c:120
 user_get_super+0xd2/0x180 fs/super.c:1000
 quotactl_block fs/quota/quota.c:890 [inline]
 __do_sys_quotactl fs/quota/quota.c:955 [inline]
 __se_sys_quotactl+0x527/0xa40 fs/quota/quota.c:917
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2e4f273c89
RSP: 002b:00007f2e4f207218 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f2e4f3016d8 RCX: 00007f2e4f273c89
RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000202
RBP: 00007f2e4f3016d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000
R13: 6f6f6c2f7665642f R14: 000020000000002c R15: 0000200000000010
 </TASK>
INFO: task syz-executor171:5870 blocked for more than 149 seconds.
      Not tainted 6.15.0-rc3-syzkaller-00032-ga79be02bba5c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor171 state:D stack:29440 pid:5870  tgid:5859  ppid:5853   task_flags:0x400040 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
 rwsem_down_write_slowpath+0xedd/0x1420 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1da/0x220 kernel/locking/rwsem.c:1578
 __super_lock fs/super.c:56 [inline]
 super_lock+0x19b/0x400 fs/super.c:120
 user_get_super+0xd2/0x180 fs/super.c:1000
 quotactl_block fs/quota/quota.c:890 [inline]
 __do_sys_quotactl fs/quota/quota.c:955 [inline]
 __se_sys_quotactl+0x527/0xa40 fs/quota/quota.c:917
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2e4f273c89
RSP: 002b:00007f2e4f207218 EFLAGS: 00000246
 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f2e4f3016d8 RCX: 00007f2e4f273c89
RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000202
RBP: 00007f2e4f3016d0 R08: 00007ffd55b33f67 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000
R13: 6f6f6c2f7665642f R14: 000020000000002c R15: 0000200000000010
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6764
2 locks held by getty/5583:
 #0: ffff8880362e20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000332e2f0
 (
&ldata->atomic_read_lock){+.+.}-{4:4}
, at: n_tty_read+0x5bb/0x1700 drivers/tty/n_tty.c:2222
2 locks held by syz-executor171/5862:
1 lock held by syz-executor171/5873:
 #0: ffff88807c98c0e0 (&type->s_umount_key#43){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88807c98c0e0 (&type->s_umount_key#43){++++}-{4:4}, at: super_lock+0x19b/0x400 fs/super.c:120
2 locks held by syz-executor171/5860:
1 lock held by syz-executor171/5871:
 #0: 
ffff8880341d20e0
 (
&type->s_umount_key
#43
){++++}-{4:4}
, at: __super_lock fs/super.c:56 [inline]
, at: super_lock+0x19b/0x400 fs/super.c:120
2 locks held by syz-executor171/5861:
1 lock held by syz-executor171/5869:
 #0: 
ffff88807b6a80e0
 (
&type->s_umount_key#43){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
&type->s_umount_key#43){++++}-{4:4}, at: super_lock+0x19b/0x400 fs/super.c:120
2 locks held by syz-executor171/5864:
1 lock held by syz-executor171/5872:
 #0: ffff8880308c80e0 (&type->s_umount_key#43
){++++}-{4:4}
, at: __super_lock fs/super.c:56 [inline]
, at: super_lock+0x19b/0x400 fs/super.c:120
2 locks held by syz-executor171/5865:
1 lock held by syz-executor171/5870:
 #0: 
ffff88807cb800e0 (&type->s_umount_key#43){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
ffff88807cb800e0 (&type->s_umount_key#43){++++}-{4:4}, at: super_lock+0x19b/0x400 fs/super.c:120

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc3-syzkaller-00032-ga79be02bba5c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x4ab/0x4e0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
 watchdog+0x1058/0x10a0 kernel/hung_task.c:437
 kthread+0x7b7/0x940 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 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: 5865 Comm: syz-executor171 Not tainted 6.15.0-rc3-syzkaller-00032-ga79be02bba5c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:check_preemption_disabled+0x4c/0x120 lib/smp_processor_id.c:55
Code: 31 3d 07 65 8b 05 34 31 3d 07 a9 ff ff ff 7f 74 24 65 49 8b 04 24 48 3b 44 24 08 0f 85 cc 00 00 00 89 d8 48 83 c4 10 5b 41 5c <41> 5d 41 5e 41 5f c3 cc cc cc cc 48 c7 04 24 00 00 00 00 9c 8f 04
RSP: 0018:ffffc90000a08720 EFLAGS: 00000082
RAX: 0000000000000001 RBX: 1ffff920001410ec RCX: 0000000000000105
RDX: 1ffff1102825f61e RSI: ffffffff8ca0e2a0 RDI: ffffffff8ca0e260
RBP: ffffc90000a08800 R08: 0000000000000000 R09: 1ffff1102825f3c2
R10: ffff8881412f9e14 R11: ffffed102825f3d5 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff93651020 R15: dffffc0000000000
FS:  00007f2e4f2286c0(0000) GS:ffff8881250cf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fafa6166bd0 CR3: 0000000024100000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_lockdep_current_cpu_online+0x37/0x120 kernel/rcu/tree.c:3986
 rcu_read_lock_held_common kernel/rcu/update.c:113 [inline]
 rcu_read_lock_sched_held+0x7c/0x140 kernel/rcu/update.c:124
 task_css_set include/linux/cgroup.h:422 [inline]
 task_dfl_cgroup include/linux/cgroup.h:491 [inline]
 task_psi_group+0x50/0x1a0 kernel/sched/psi.c:880
 psi_task_change+0xc9/0x270 kernel/sched/psi.c:910
 psi_enqueue kernel/sched/stats.h:166 [inline]
 enqueue_task+0x374/0x450 kernel/sched/core.c:2082
 activate_task kernel/sched/core.c:2122 [inline]
 ttwu_do_activate+0x206/0x8e0 kernel/sched/core.c:3732
 ttwu_queue kernel/sched/core.c:4000 [inline]
 try_to_wake_up+0x93a/0x15d0 kernel/sched/core.c:4328
 kick_pool+0x45c/0x620 kernel/workqueue.c:1279
 __queue_work+0xdb0/0x10a0 kernel/workqueue.c:2342
 call_timer_fn+0x189/0x650 kernel/time/timer.c:1789