rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=4104/1/0x4000000000000000 softirq=37496/37496 fqs=0 rcu: 1-...!: (1 GPs behind) idle=554c/1/0x4000000000000000 softirq=38997/39022 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4687/1:b..l rcu: (detected by 1, t=10505 jiffies, g=31281, q=844482 ncpus=2) CPU: 1 UID: 0 PID: 15567 Comm: syz.4.5005 Not tainted 6.11.0-syzkaller-11517-gc4a14f6d9d17 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 9e a4 2f f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 03 42 94 f5 65 8b 05 24 15 35 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc90002eaf1c0 EFLAGS: 00000206 RAX: 6b8bf52389c14900 RBX: 1ffff920005d5e3c RCX: ffffffff8170892a RDX: dffffc0000000000 RSI: ffffffff8c0aca40 RDI: 0000000000000001 RBP: ffffc90002eaf250 R08: ffffffff9426e7f7 R09: 1ffffffff284dcfe R10: dffffc0000000000 R11: fffffbfff284dcff R12: dffffc0000000000 R13: 1ffff920005d5e38 R14: ffffc90002eaf1e0 R15: 0000000000000246 FS: 00007f4b8121c6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f19d80ba866 CR3: 000000002fe52000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:998 [inline] debug_check_no_obj_freed+0x561/0x580 lib/debugobjects.c:1019 free_pages_prepare mm/page_alloc.c:1115 [inline] free_unref_page+0x41b/0xf20 mm/page_alloc.c:2638 discard_slab mm/slub.c:2678 [inline] __put_partials+0xeb/0x130 mm/slub.c:3146 put_cpu_partial+0x17c/0x250 mm/slub.c:3221 __slab_free+0x2ea/0x3d0 mm/slub.c:4450 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4086 [inline] slab_alloc_node mm/slub.c:4135 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4142 __kernfs_new_node+0xd8/0x870 fs/kernfs/dir.c:624 kernfs_new_node+0x137/0x240 fs/kernfs/dir.c:700 __kernfs_create_file+0x49/0x2e0 fs/kernfs/file.c:1034 sysfs_add_file_mode_ns+0x24a/0x310 fs/sysfs/file.c:307 create_files fs/sysfs/group.c:76 [inline] internal_create_group+0x7a7/0x11d0 fs/sysfs/group.c:180 internal_create_groups fs/sysfs/group.c:220 [inline] sysfs_create_groups+0x56/0x120 fs/sysfs/group.c:246 device_add_groups drivers/base/core.c:2829 [inline] device_add_attrs+0xe5/0x600 drivers/base/core.c:2893 device_add+0x576/0xbf0 drivers/base/core.c:3636 netdev_register_kobject+0x17e/0x310 net/core/net-sysfs.c:2139 register_netdevice+0x12c5/0x1b00 net/core/dev.c:10491 ppp_unit_register drivers/net/ppp/ppp_generic.c:1219 [inline] ppp_dev_configure+0x883/0xb10 drivers/net/ppp/ppp_generic.c:1275 ppp_create_interface drivers/net/ppp/ppp_generic.c:3348 [inline] ppp_unattached_ioctl drivers/net/ppp/ppp_generic.c:1060 [inline] ppp_ioctl+0x797/0x1cd0 drivers/net/ppp/ppp_generic.c:733 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 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: 0033:0x7f4b8037dff9 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:00007f4b8121c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4b80535f80 RCX: 00007f4b8037dff9 RDX: 0000000020000140 RSI: 00000000c004743e RDI: 0000000000000003 RBP: 00007f4b803f0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4b80535f80 R15: 00007ffe8400de28 task:udevd state:R running task stack:21664 pid:4687 tgid:4687 ppid:1 flags:0x00000002 Call Trace: context_switch kernel/sched/core.c:5315 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6675 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6997 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_release+0x48/0xa30 kernel/locking/lockdep.c:5830 Code: f5 48 89 7c 24 18 65 48 8b 04 25 28 00 00 00 48 89 84 24 e0 00 00 00 49 bf 00 00 00 00 00 fc ff df 48 c7 44 24 60 b3 8a b5 41 <48> c7 44 24 68 02 ce 09 8e 48 c7 44 24 70 50 3c 70 81 4c 8d 64 24 RSP: 0018:ffffc90004057880 EFLAGS: 00000282 RAX: c5fba1daf106c600 RBX: 0000000000000001 RCX: ffff8880742f1e00 RDX: 0000000000000000 RSI: ffffffff820b37b7 RDI: ffffffff8e937ee0 RBP: ffffc900040579b0 R08: ffffffff820b3746 R09: 1ffff11003ec3a26 R10: dffffc0000000000 R11: ffffed1003ec3a27 R12: 0000000000000008 R13: ffffffff820b37b7 R14: ffff88801f61d174 R15: dffffc0000000000 rcu_lock_release include/linux/rcupdate.h:347 [inline] rcu_read_unlock include/linux/rcupdate.h:880 [inline] page_ext_put+0xa3/0xc0 mm/page_ext.c:550 __reset_page_owner+0x2de/0x430 mm/page_owner.c:300 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2638 discard_slab mm/slub.c:2678 [inline] __put_partials+0xeb/0x130 mm/slub.c:3146 put_cpu_partial+0x17c/0x250 mm/slub.c:3221 __slab_free+0x2ea/0x3d0 mm/slub.c:4450 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4086 [inline] slab_alloc_node mm/slub.c:4135 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4142 getname_flags+0xb7/0x540 fs/namei.c:139 vfs_fstatat+0x12c/0x190 fs/stat.c:340 __do_sys_newfstatat fs/stat.c:505 [inline] __se_sys_newfstatat fs/stat.c:499 [inline] __x64_sys_newfstatat+0x11d/0x1a0 fs/stat.c:499 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: 0033:0x7f19d7d165f4 RSP: 002b:00007fff93716648 EFLAGS: 00000246 ORIG_RAX: 0000000000000106 RAX: ffffffffffffffda RBX: 00007fff93717fe8 RCX: 00007f19d7d165f4 RDX: 00007fff93716658 RSI: 00007fff93716ae8 RDI: 00000000ffffff9c RBP: 00007fff937166e8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff93716ae8 R13: 00007fff93716658 R14: 0000556b3cb01910 R15: 0000000000000000