watchdog: BUG: soft lockup - CPU#1 stuck for 47s! [syz.0.368:9015] Modules linked in: irq event stamp: 5792 hardirqs last enabled at (5791): [] ___slab_alloc+0x1d8/0x127c mm/slub.c:4536 hardirqs last disabled at (5792): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (5792): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162 softirqs last enabled at (5764): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (5762): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 1 UID: 0 PID: 9015 Comm: syz.0.368 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 23400005 (nzCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] pc : _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:194 lr : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] lr : _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 sp : ffff80009d5e6b00 x29: ffff80009d5e6b00 x28: 0000000000000008 x27: ffff0000c18c4408 x26: fffffdffc34310d0 x25: fffffdffc305cf40 x24: dead000000000100 x23: fffffdffc305cf40 x22: ffff0000c18c5280 x21: ffff80009d5e6c08 x20: ffff0000c18c43c0 x19: 0000000000000000 x18: 00000000ffffffff x17: 0000000000000000 x16: ffff8000802127fc x15: 0000000000000001 x14: 1fffe00018318878 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000080000 x10: 000000000007ffff x9 : 0000000000000000 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : ffff800080c041c4 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000010 x2 : ffff80009d5e6b00 x1 : 0000000000000000 x0 : ffff80008afb8f10 Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:194 (P) spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] get_partial_node+0x3cc/0x41c mm/slub.c:3550 get_partial mm/slub.c:3630 [inline] ___slab_alloc+0x918/0x127c mm/slub.c:4631 __slab_alloc+0x80/0x12c mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] kmem_cache_alloc_noprof+0x3ec/0x680 mm/slub.c:5270 alloc_buffer_head+0x38/0x304 fs/buffer.c:3025 folio_alloc_buffers+0x3d8/0x848 fs/buffer.c:935 grow_dev_folio fs/buffer.c:1075 [inline] grow_buffers fs/buffer.c:1116 [inline] __getblk_slow fs/buffer.c:1134 [inline] bdev_getblk+0x24c/0x650 fs/buffer.c:1461 getblk_unmovable include/linux/buffer_head.h:369 [inline] ext4_getblk+0x228/0x6bc fs/ext4/inode.c:999 ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:1047 ext4_append+0x230/0x46c fs/ext4/namei.c:83 ext4_init_new_dir+0x100/0x1a8 fs/ext4/namei.c:2979 ext4_mkdir+0x3bc/0xa28 fs/ext4/namei.c:3015 vfs_mkdir+0x408/0x48c fs/namei.c:5130 ovl_do_mkdir fs/overlayfs/overlayfs.h:251 [inline] ovl_workdir_create+0x24c/0x768 fs/overlayfs/super.c:345 ovl_make_workdir fs/overlayfs/super.c:682 [inline] ovl_get_workdir fs/overlayfs/super.c:840 [inline] ovl_fill_super_creds fs/overlayfs/super.c:1453 [inline] ovl_fill_super+0x13f4/0x4cdc fs/overlayfs/super.c:1567 vfs_get_super fs/super.c:1324 [inline] get_tree_nodev+0xb4/0x144 fs/super.c:1343 ovl_get_tree+0x28/0x38 fs/overlayfs/params.c:708 vfs_get_tree+0x90/0x28c fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x284/0x944 fs/namespace.c:3712 path_mount+0x5b4/0xdfc fs/namespace.c:4022 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount fs/namespace.c:4201 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4201 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 1544 Comm: kworker/0:2 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Workqueue: events bpf_prog_free_deferred pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : csd_lock_wait kernel/smp.c:342 [inline] pc : smp_call_function_many_cond+0xed0/0x1418 kernel/smp.c:877 lr : csd_lock_wait kernel/smp.c:342 [inline] lr : smp_call_function_many_cond+0xee8/0x1418 kernel/smp.c:877 sp : ffff80009ed87700 x29: ffff80009ed87810 x28: 0000000000000011 x27: ffff00019bbfebc0 x26: 0000000000000001 x25: ffff80008f871fc8 x24: ffffffffffffffff x23: 1fffe0003377fd78 x22: dfff800000000000 x21: 1fffe0003377fd79 x20: ffff00019bc27a88 x19: ffff00019bbfebc8 x18: 1fffe0003377d090 x17: ffff80008afa4f84 x16: ffff800082e5c71c x15: 0000000000000001 x14: 1fffe00033784f51 x13: 0000000000000000 x12: 0000000000000000 x11: ffff600033784f52 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : ffff80008022e5dc x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000806a2528 x2 : 0000000000000000 x1 : 0000000000000004 x0 : 0000000000000001 Call trace: __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:231 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:257 [inline] (P) csd_lock_wait kernel/smp.c:342 [inline] (P) smp_call_function_many_cond+0xed0/0x1418 kernel/smp.c:877 (P) smp_call_function_many kernel/smp.c:900 [inline] smp_call_function kernel/smp.c:922 [inline] kick_all_cpus_sync+0x40/0xa0 kernel/smp.c:1067 flush_icache_range arch/arm64/include/asm/cacheflush.h:103 [inline] __text_poke+0xd4/0xf4 arch/arm64/kernel/patching.c:130 aarch64_insn_set+0x50/0x80 arch/arm64/kernel/patching.c:177 bpf_arch_text_invalidate+0x30/0x4c arch/arm64/net/bpf_jit_comp.c:275 bpf_prog_pack_free+0x1c4/0x3e4 kernel/bpf/core.c:989 bpf_jit_binary_pack_free+0x40/0xc8 kernel/bpf/core.c:1187 bpf_jit_free+0x108/0x428 arch/arm64/net/bpf_jit_comp.c:3144 bpf_prog_free_deferred+0x51c/0x5f4 kernel/bpf/core.c:2919 process_one_work+0x7c0/0x1558 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3421 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844