syzbot

INFO: task syz.2.90:6029 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc2-syzkaller-00050-g5b7c893ed5ed #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.90        state:D stack:27160 pid:6029  tgid:6023  ppid:5220   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5315 [inline]
 __schedule+0x1843/0x4ae0 kernel/sched/core.c:6675
 __schedule_loop kernel/sched/core.c:6752 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6767
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6824
 rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write_nested+0x1e0/0x220 kernel/locking/rwsem.c:1694
 inode_lock_nested include/linux/fs.h:850 [inline]
 lock_rename fs/namei.c:3161 [inline]
 do_renameat2+0x62c/0x13f0 fs/namei.c:5105
 __do_sys_rename fs/namei.c:5217 [inline]
 __se_sys_rename fs/namei.c:5215 [inline]
 __x64_sys_rename+0x82/0x90 fs/namei.c:5215
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efeeb57dff9
RSP: 002b:00007efeec41e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007efeeb736058 RCX: 00007efeeb57dff9
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000020000000
RBP: 00007efeeb5f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007efeeb736058 R15: 00007fffb1b60218
 </TASK>

Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
1 lock held by khungtaskd/30:
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720
2 locks held by kworker/u8:8/2941:
2 locks held by getty/4971:
 #0: ffff88814b8270a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002efe2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
3 locks held by kworker/0:3/5269:
3 locks held by syz.2.90/6024:
2 locks held by syz.2.90/6029:
 #0: ffff88805eca0420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515
 #1: ffff888062c33f68 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:850 [inline]
 #1: ffff888062c33f68 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: lock_rename fs/namei.c:3161 [inline]
 #1: ffff888062c33f68 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_renameat2+0x62c/0x13f0 fs/namei.c:5105
2 locks held by syz.1.352/7963:
2 locks held by syz.0.396/7974:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc2-syzkaller-00050-g5b7c893ed5ed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xff4/0x1040 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7973 Comm: syz.0.396 Not tainted 6.12.0-rc2-syzkaller-00050-g5b7c893ed5ed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:check_preemption_disabled+0x2e/0x120
Code: 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 8b 1d 5c c2 46 74 65 8b 05 51 c2 46 74 a9 ff ff ff 7f 74 26 <65> 48 8b 04 25 28 00 00 00 48 3b 44 24 08 0f 85 ce 00 00 00 89 d8
RSP: 0000:ffffc90002e07ac8 EFLAGS: 00000046
RAX: 0000000080000000 RBX: 0000000000000000 RCX: ffffffff8170cd3a
RDX: dffffc0000000000 RSI: ffffffff8c0adc40 RDI: ffffffff8c602820
RBP: ffffc90002e07ba8 R08: ffffffff9429089f R09: 1ffffffff2852113
R10: dffffc0000000000 R11: fffffbfff2852114 R12: ffff8880323aa950
R13: 0000000000000002 R14: ffff8880323aa8d8 R15: 1ffff1100647551b
FS:  000055558a800500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020007000 CR3: 000000006cf5e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
 lockdep_hardirqs_on_prepare+0x43d/0x780 kernel/locking/lockdep.c:4407
 trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:61
 native_save_fl arch/x86/include/asm/irqflags.h:19 [inline]
 arch_local_save_flags arch/x86/include/asm/irqflags.h:87 [inline]
 arch_irqs_disabled arch/x86/include/asm/irqflags.h:147 [inline]
 count_memcg_events include/linux/memcontrol.h:1022 [inline]
 count_memcg_events_mm include/linux/memcontrol.h:1045 [inline]
 count_memcg_event_mm+0x236/0x420 include/linux/memcontrol.h:1052
 mm_account_fault mm/memory.c:5928 [inline]
 handle_mm_fault+0x1624/0x1ad0 mm/memory.c:6088
 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f1115f45d0a
Code: 00 01 00 00 00 74 9a 83 f9 c0 0f 87 8c fe ff ff c5 fe 6f 4e 20 48 29 fe 48 83 c7 3f 49 8d 0c 10 48 83 e7 c0 48 01 fe 48 29 f9 <f3> a4 c4 c1 7e 7f 00 c4 c1 7e 7f 48 20 e9 0b fd ff ff 0f 1f 40 00
RSP: 002b:00007ffe44c1cc88 EFLAGS: 00010206
RAX: 0000000020001ec0 RBX: 0000000000000004 RCX: 000000000001a715
RDX: 000000000001f855 RSI: 00007f1115a1813c RDI: 0000000020007000
RBP: 00007f1116137a80 R08: 0000000020001ec0 R09: 000000000000000f
R10: 0000000000000000 R11: 0000000000000002 R12: 0000000000042e32
R13: 00007ffe44c1cd90 R14: 0000000000000fd2 R15: fffffffffffffffe
 </TASK>