rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=6744/1/0x4000000000000000 softirq=30257/30264 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5818/1:b..l P9508/1:b..l
rcu: 	(detected by 0, t=10506 jiffies, g=23361, q=543 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9514 Comm: dhcpcd-run-hook Not tainted 6.14.0-rc2-syzkaller-00185-g128c8f96eb86 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:107 [inline]
RIP: 0010:raw_atomic_try_cmpxchg_acquire include/linux/atomic/atomic-arch-fallback.h:2170 [inline]
RIP: 0010:atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1302 [inline]
RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
RIP: 0010:do_raw_spin_lock+0x12d/0x2c0 kernel/locking/spinlock_debug.c:116
Code: 0f 84 35 01 00 00 48 89 df be 04 00 00 00 c7 44 24 28 00 00 00 00 e8 42 da 85 00 be 04 00 00 00 48 8d 7c 24 28 e8 33 da 85 00 <8b> 44 24 28 ba 01 00 00 00 89 44 24 04 f0 0f b1 13 0f 85 95 00 00
RSP: 0018:ffffc90000a18ce8 EFLAGS: 00000097
RAX: 0000000000000001 RBX: ffff888078d0c2e8 RCX: ffffffff819719cd
RDX: fffff520001431a2 RSI: 0000000000000004 RDI: ffffc90000a18d10
RBP: 1ffff9200014319e R08: 0000000000000001 R09: fffff520001431a2
R10: 0000000000000003 R11: 0000000000000000 R12: ffff888078d0c2f0
R13: ffff888078d0c2f8 R14: ffff888078d0c340 R15: ffffffff896a4870
FS:  00007f98501c7500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564888054db8 CR3: 000000007a71e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 spin_lock include/linux/spinlock.h:351 [inline]
 advance_sched+0xd8/0xc60 net/sched/sch_taprio.c:924
 __run_hrtimer kernel/time/hrtimer.c:1801 [inline]
 __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1865
 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1927
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__orc_find+0xab/0xf0 arch/x86/kernel/unwind_orc.c:110
Code: 75 4b 48 63 13 48 01 da 49 39 d5 73 af 4c 8d 63 fc 49 39 ec 73 b2 4d 29 f7 49 c1 ff 02 4b 8d 14 7f 48 8d 04 50 48 83 c4 08 5b <5d> 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 48 83 c4 08 31 c0 5b 5d
RSP: 0018:ffffc9000d4c7898 EFLAGS: 00000296
RAX: ffffffff9105682a RBX: 0000000000000001 RCX: dffffc0000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff907d80a8
RBP: ffffffff907d80b0 R08: ffffffff91056866 R09: ffffffff9105a170
R10: ffffc9000d4c7938 R11: 0000000000012fd6 R12: ffffffff907d80ac
R13: ffffffff822fd60e R14: ffffffff907d80a8 R15: 0000000000000001
 orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
 unwind_next_frame+0x2be/0x20c0 arch/x86/kernel/unwind_orc.c:494
 arch_stack_walk+0x95/0x100 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4115 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 kmem_cache_alloc_noprof+0x226/0x3d0 mm/slub.c:4171
 getname_flags.part.0+0x4c/0x550 fs/namei.c:139
 getname_flags include/linux/audit.h:322 [inline]
 getname+0x8d/0xe0 fs/namei.c:223
 getname_maybe_null include/linux/fs.h:2860 [inline]
 vfs_fstatat+0xdf/0xf0 fs/stat.c:363
 __do_sys_newfstatat+0xa2/0x130 fs/stat.c:532
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f985031b5f4
Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8
RSP: 002b:00007ffec0ea72f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007ffec0ea74c8 RCX: 00007f985031b5f4
RDX: 00007ffec0ea7358 RSI: 0000564888054e28 RDI: 00000000ffffff9c
RBP: 0000564888054d48 R08: 000000000000000d R09: 00007ffec0eabdf8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
task:syz.4.1483      state:R  running task     stack:26048 pid:9508  tgid:9508  ppid:5819   task_flags:0x40004c flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6764
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6943
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 zap_pte_range mm/memory.c:1761 [inline]
 zap_pmd_range mm/memory.c:1823 [inline]
 zap_pud_range mm/memory.c:1852 [inline]
 zap_p4d_range mm/memory.c:1873 [inline]
 unmap_page_range+0xec7/0x43a0 mm/memory.c:1894
 unmap_single_vma+0x194/0x2b0 mm/memory.c:1940
 unmap_vmas+0x22f/0x490 mm/memory.c:1984
 exit_mmap+0x1c1/0xba0 mm/mmap.c:1284
 __mmput+0x12a/0x410 kernel/fork.c:1356
 mmput+0x62/0x70 kernel/fork.c:1378
 exit_mm kernel/exit.c:570 [inline]
 do_exit+0x9ba/0x2d70 kernel/exit.c:925
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
 __do_sys_exit_group kernel/exit.c:1098 [inline]
 __se_sys_exit_group kernel/exit.c:1096 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1096
 x64_sys_call+0x151f/0x1720 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcce418cde9
RSP: 002b:00007ffcf5f8cb98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcce418cde9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffcf5f8cbfc R08: 00000004f5f8cc8f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000104
R13: 00000000000927c0 R14: 000000000002580d R15: 00007ffcf5f8cc50
 </TASK>
task:syz-executor    state:R  running task     stack:22112 pid:5818  tgid:5818  ppid:5809   task_flags:0x400140 flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6764
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6943
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 sidtab_sid2str_put+0x4ae/0x890 security/selinux/ss/sidtab.c:604
 sidtab_sid2str_get+0x234/0x680 security/selinux/ss/sidtab.c:634
 sidtab_entry_to_string+0x33/0x110 security/selinux/ss/services.c:1295
 security_sid_to_context_core+0x35c/0x640 security/selinux/ss/services.c:1398
 selinux_inode_init_security+0x465/0x670 security/selinux/hooks.c:2946
 security_inode_init_security+0x1e6/0x390 security/security.c:1836
 shmem_mknod+0x22e/0x450 mm/shmem.c:3838
 shmem_mkdir+0x31/0x60 mm/shmem.c:3897
 vfs_mkdir+0x57d/0x860 fs/namei.c:4313
 do_mkdirat+0x301/0x3a0 fs/namei.c:4336
 __do_sys_mkdirat fs/namei.c:4351 [inline]
 __se_sys_mkdirat fs/namei.c:4349 [inline]
 __x64_sys_mkdirat+0x83/0xb0 fs/namei.c:4349
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8a6af8b657
RSP: 002b:00007ffcdf61e3f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007ffcdf61e450 RCX: 00007f8a6af8b657
RDX: 00000000000001ff RSI: 00007ffcdf61e450 RDI: 00000000ffffff9c
RBP: 00007ffcdf61e43c R08: 0000000000000005 R09: 00007ffcdf61e195
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000012f
R13: 00000000000927c0 R14: 0000000000025afe R15: 00007ffcdf61e490
 </TASK>
rcu: rcu_preempt kthread starved for 10506 jiffies! g23361 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:27456 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6856
 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2024
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2226
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 9497 Comm: syz.2.1479 Not tainted 6.14.0-rc2-syzkaller-00185-g128c8f96eb86 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x4cb/0x12c0 kernel/smp.c:885
Code: 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 fc 4c 89 fd 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 fc 04 0c 00 f3 90 41 0f b6 04 24 <40> 38 c5 7c 08 84 c0 0f 85 e8 0b 00 00 8b 43 08 31 ff 83 e0 01 41
RSP: 0018:ffffc9000c7bf920 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880b8744a80 RCX: ffffc90005afb000
RDX: 0000000000080000 RSI: ffffffff81adcee4 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffed10170e8951
R13: 0000000000000001 R14: ffff8880b863fe80 R15: ffff8880b8744a88
FS:  00007f6bfad7a6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2a512d CR3: 000000007be78000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052
 kill_bdev block/bdev.c:90 [inline]
 set_blocksize+0x299/0x360 block/bdev.c:172
 sb_set_blocksize+0x47/0x120 block/bdev.c:181
 udf_load_vrs+0xda/0x1050 fs/udf/super.c:1998
 udf_fill_super+0x79b/0x1e00 fs/udf/super.c:2192
 get_tree_bdev_flags+0x38b/0x620 fs/super.c:1636
 vfs_get_tree+0x8b/0x340 fs/super.c:1814
 do_new_mount fs/namespace.c:3560 [inline]
 path_mount+0x14e6/0x1f10 fs/namespace.c:3887
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount fs/namespace.c:4088 [inline]
 __x64_sys_mount+0x28f/0x310 fs/namespace.c:4088
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6bf9f8cde9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6bfad7a038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f6bfa1a5fa0 RCX: 00007f6bf9f8cde9
RDX: 0000400000000040 RSI: 0000400000004a00 RDI: 0000400000000000
RBP: 00007f6bfa00e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008007 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6bfa1a5fa0 R15: 00007ffdea9fa628
 </TASK>