watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.0.99:6340] Modules linked in: irq event stamp: 14625633 hardirqs last enabled at (14625632): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (14625633): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (10738102): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (10738102): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (10738102): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (10738105): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (10738105): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (10738105): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 6340 Comm: syz.0.99 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:check_preemption_disabled+0x1d/0xe0 lib/smp_processor_id.c:53 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 53 65 8b 05 c7 c6 56 07 65 8b 0d bc c6 56 07 f7 c1 ff ff ff 7f 74 0c 5b <41> 5e 41 5f 5d e9 59 c7 02 00 cc 9c 59 f7 c1 00 02 00 00 74 ea 65 RSP: 0018:ffffc90000a07d18 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000102 RDX: 0000000000000100 RSI: ffffffff8be73de0 RDI: ffffffff8be73da0 RBP: ffffffff8174c0e5 R08: ffffc90000a079d7 R09: 0000000000000000 R10: ffffc90000a079c8 R11: fffff52000140f3b R12: 0000000000000002 R13: ffffffff8e35a320 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fc505e156c0(0000) GS:ffff888125a29000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000076464000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:751 trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x5f/0x330 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 __unwind_start+0x5b8/0x760 arch/x86/kernel/unwind_orc.c:773 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5657 [inline] __kmalloc_noprof+0x40c/0x7e0 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] cfg80211_inform_single_bss_data+0x934/0x1ab0 net/wireless/scan.c:2345 cfg80211_inform_bss_data+0x233/0x3bb0 net/wireless/scan.c:3228 cfg80211_inform_bss_frame_data+0x3c7/0x710 net/wireless/scan.c:3319 ieee80211_bss_info_update+0x794/0xa40 net/mac80211/scan.c:230 ieee80211_scan_rx+0x593/0xa20 net/mac80211/scan.c:359 __ieee80211_rx_handle_packet net/mac80211/rx.c:5287 [inline] ieee80211_rx_list+0x2508/0x3050 net/mac80211/rx.c:5544 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5567 ieee80211_rx include/net/mac80211.h:5216 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:925 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:end_of_stack include/linux/sched/task_stack.h:33 [inline] RIP: 0010:schedule_debug kernel/sched/core.c:5815 [inline] RIP: 0010:__schedule+0x172/0x4fb0 kernel/sched/core.c:6740 Code: 89 5c 24 50 4c 8b 33 49 8d 5e 20 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 7e a6 b0 f6 <48> 8b 1b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c RSP: 0018:ffffc9000b9d7440 EFLAGS: 00000246 RAX: 1ffff11005cd3b74 RBX: ffff88802e69dba0 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8be73de0 RDI: ffffffff8be73da0 RBP: ffffc9000b9d7640 R08: ffffffff8fced377 R09: 1ffffffff1f9da6e R10: dffffc0000000000 R11: fffffbfff1f9da6f R12: ffff888125a29000 R13: 0000000000000001 R14: ffff88802e69db80 R15: 1ffff110170e7680 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:unwind_next_frame+0x4a5/0x23c0 arch/x86/kernel/unwind_orc.c:520 Code: e0 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 66 18 00 00 4c 89 e8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 79 18 00 00 41 0f b6 44 24 01 <83> e0 07 0f 84 66 15 00 00 83 f8 01 4c 8b 7c 24 50 48 bd 00 00 00 RSP: 0018:ffffc9000b9d7778 EFLAGS: 00000246 RAX: 0000000000000002 RBX: ffffffff8fef0a6c RCX: ffffffff8fef0a70 RDX: ffffffff906f645c RSI: ffffffff906f645c RDI: ffffffff8be73da0 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff8e35a320 R10: ffffc9000b9d7348 R11: fffff5200173ae6b R12: ffffffff906f6460 R13: ffffffff906f6461 R14: ffffc9000b9d7848 R15: ffffffff8fef0a6c arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 save_stack+0x122/0x230 mm/page_owner.c:165 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0xbb0/0xd10 mm/page_alloc.c:2943 discard_slab mm/slub.c:3346 [inline] __put_partials+0x146/0x170 mm/slub.c:3886 __slab_free+0x294/0x320 mm/slub.c:5952 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x370/0x6e0 mm/slub.c:5270 getname_flags+0xb7/0x540 fs/namei.c:146 getname include/linux/fs.h:2498 [inline] do_sys_openat2+0xca/0x220 fs/open.c:1426 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1447 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc504f9acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc505e15028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fc505215fa0 RCX: 00007fc504f9acb9 RDX: 000000000000275a RSI: 0000000000000000 RDI: ffffffffffffffff RBP: 00007fc505008bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc505216038 R14: 00007fc505215fa0 R15: 00007ffcead6f568 Sending NMI from CPU 1 to CPUs 0: rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 3699 Comm: kworker/u8:13 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:io_serial_in+0x77/0xc0 drivers/tty/serial/8250/8250_port.c:400 Code: e8 6e bb 9c fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 8f 4a 04 fd 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f c3 cc cc cc cc cc 44 89 f9 80 e1 07 RSP: 0018:ffffc900000074f8 EFLAGS: 00000006 RAX: 1ffffffff3420005 RBX: 00000000000003f9 RCX: 0000000000000000 RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020 RBP: ffffc90000007690 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: ffffffff8525c5b0 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffffff9a1002e0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125929000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f21e1359070 CR3: 000000000e146000 CR4: 00000000003526f0 Call Trace: serial_port_in include/linux/serial_core.h:806 [inline] serial8250_console_write+0x540/0x1ba0 drivers/tty/serial/8250/8250_port.c:3306 console_emit_next_record kernel/printk/printk.c:3129 [inline] console_flush_one_record kernel/printk/printk.c:3215 [inline] console_flush_all+0x718/0xb20 kernel/printk/printk.c:3289 __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3359 vprintk_emit+0x485/0x560 kernel/printk/printk.c:2426 _printk+0xdd/0x130 kernel/printk/printk.c:2451 print_other_cpu_stall+0x1a9/0x1380 kernel/rcu/tree_stall.h:656 check_cpu_stall kernel/rcu/tree_stall.h:856 [inline] rcu_pending kernel/rcu/tree.c:3667 [inline] rcu_sched_clock_irq+0x99f/0x1130 kernel/rcu/tree.c:2704 update_process_times+0x23b/0x2f0 kernel/time/timer.c:2474 tick_sched_handle kernel/time/tick-sched.c:298 [inline] tick_nohz_handler+0x42b/0x770 kernel/time/tick-sched.c:319 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x4dc/0xc30 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3d0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xce5/0x1270 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 94 b4 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 3f b0 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 23 b0 RSP: 0018:ffffc9000cd376a0 EFLAGS: 00000293 RAX: ffffffff81b6d14d RBX: 1ffff110170e8129 RCX: ffff888031355b80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000cd377e0 R08: ffffffff8fced377 R09: 1ffffffff1f9da6e R10: dffffc0000000000 R11: fffffbfff1f9da6f R12: ffff8880b8740948 R13: dffffc0000000000 R14: ffff8880b863bb00 R15: 0000000000000001 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2711 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2921 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xab/0x250 mm/kfence/core.c:874 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0x89f/0xd90 kernel/workqueue.c:3421 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 rcu: 1-....: (4258 ticks this GP) idle=5e94/1/0x4000000000000000 softirq=14915/14918 fqs=125 rcu: hardirqs softirqs csw/system rcu: number: 1989237 17 0 rcu: cputime: 37587 5906 12 ==> 43510(ms) rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6360/1:b..l P6340 rcu: (detected by 0, t=10636 jiffies, g=10569, q=2222 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6340 Comm: syz.0.99 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:skb_dst+0x0/0xd0 include/linux/skbuff.h:1158 Code: 7f a1 f7 eb d7 e8 a0 7f a1 f7 bb 57 00 00 00 4c 8b 6c 24 18 e9 e2 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 41 57 41 56 41 54 53 48 89 fb 49 be 00 00 00 00 00 fc ff df e8 RSP: 0018:ffffc90000a08a80 EFLAGS: 00000202 RAX: ffffffff8a211510 RBX: ffff8880521e3280 RCX: ffff88802e69db80 RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff8880521e3280 RBP: 0000000000000001 R08: ffffffff8fced377 R09: 1ffffffff1f9da6e R10: dffffc0000000000 R11: fffffbfff1f9da6f R12: ffff8880326ae281 R13: dffffc0000000000 R14: ffff8880326ae2a8 R15: 1ffff1100a43c65b FS: 00007fc505e156c0(0000) GS:ffff888125a29000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000076464000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: dst_input include/net/dst.h:474 [inline] ip6_rcv_finish+0x239/0x2e0 net/ipv6/ip6_input.c:79 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6139 [inline] __netif_receive_skb+0xd3/0x370 net/core/dev.c:6252 process_backlog+0x54e/0x1340 net/core/dev.c:6604 __napi_poll+0xae/0x320 net/core/dev.c:7668 napi_poll net/core/dev.c:7731 [inline] net_rx_action+0x696/0xe30 net/core/dev.c:7883 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:end_of_stack include/linux/sched/task_stack.h:33 [inline] RIP: 0010:schedule_debug kernel/sched/core.c:5815 [inline] RIP: 0010:__schedule+0x172/0x4fb0 kernel/sched/core.c:6740 Code: 89 5c 24 50 4c 8b 33 49 8d 5e 20 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 7e a6 b0 f6 <48> 8b 1b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c RSP: 0018:ffffc9000b9d7440 EFLAGS: 00000246 RAX: 1ffff11005cd3b74 RBX: ffff88802e69dba0 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8be73de0 RDI: ffffffff8be73da0 RBP: ffffc9000b9d7640 R08: ffffffff8fced377 R09: 1ffffffff1f9da6e R10: dffffc0000000000 R11: fffffbfff1f9da6f R12: ffff888125a29000 R13: 0000000000000001 R14: ffff88802e69db80 R15: 1ffff110170e7680 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:unwind_next_frame+0x4a5/0x23c0 arch/x86/kernel/unwind_orc.c:520 Code: e0 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 66 18 00 00 4c 89 e8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 79 18 00 00 41 0f b6 44 24 01 <83> e0 07 0f 84 66 15 00 00 83 f8 01 4c 8b 7c 24 50 48 bd 00 00 00 RSP: 0018:ffffc9000b9d7778 EFLAGS: 00000246 RAX: 0000000000000002 RBX: ffffffff8fef0a6c RCX: ffffffff8fef0a70 RDX: ffffffff906f645c RSI: ffffffff906f645c RDI: ffffffff8be73da0 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff8e35a320 R10: ffffc9000b9d7348 R11: fffff5200173ae6b R12: ffffffff906f6460 R13: ffffffff906f6461 R14: ffffc9000b9d7848 R15: ffffffff8fef0a6c arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 save_stack+0x122/0x230 mm/page_owner.c:165 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0xbb0/0xd10 mm/page_alloc.c:2943 discard_slab mm/slub.c:3346 [inline] __put_partials+0x146/0x170 mm/slub.c:3886 __slab_free+0x294/0x320 mm/slub.c:5952 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x370/0x6e0 mm/slub.c:5270 getname_flags+0xb7/0x540 fs/namei.c:146 getname include/linux/fs.h:2498 [inline] do_sys_openat2+0xca/0x220 fs/open.c:1426 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1447 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc504f9acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc505e15028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fc505215fa0 RCX: 00007fc504f9acb9 RDX: 000000000000275a RSI: 0000000000000000 RDI: ffffffffffffffff RBP: 00007fc505008bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc505216038 R14: 00007fc505215fa0 R15: 00007ffcead6f568 task:syz.0.99 state:R running task stack:25624 pid:6340 tgid:6339 ppid:5825 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x14ef/0x4fb0 kernel/sched/core.c:6863 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190 irqentry_exit+0x597/0x620 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:unwind_next_frame+0x4a5/0x23c0 arch/x86/kernel/unwind_orc.c:520 Code: e0 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 66 18 00 00 4c 89 e8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 79 18 00 00 41 0f b6 44 24 01 <83> e0 07 0f 84 66 15 00 00 83 f8 01 4c 8b 7c 24 50 48 bd 00 00 00 RSP: 0018:ffffc9000b9d7778 EFLAGS: 00000246 RAX: 0000000000000002 RBX: ffffffff8fef0a6c RCX: ffffffff8fef0a70 RDX: ffffffff906f645c RSI: ffffffff906f645c RDI: ffffffff8be73da0 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff8e35a320 R10: ffffc9000b9d7348 R11: fffff5200173ae6b R12: ffffffff906f6460 R13: ffffffff906f6461 R14: ffffc9000b9d7848 R15: ffffffff8fef0a6c arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 save_stack+0x122/0x230 mm/page_owner.c:165 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0xbb0/0xd10 mm/page_alloc.c:2943 discard_slab mm/slub.c:3346 [inline] __put_partials+0x146/0x170 mm/slub.c:3886 __slab_free+0x294/0x320 mm/slub.c:5952 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x370/0x6e0 mm/slub.c:5270 getname_flags+0xb7/0x540 fs/namei.c:146 getname include/linux/fs.h:2498 [inline] do_sys_openat2+0xca/0x220 fs/open.c:1426 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1447 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc504f9acb9 RSP: 002b:00007fc505e15028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fc505215fa0 RCX: 00007fc504f9acb9 RDX: 000000000000275a RSI: 0000000000000000 RDI: ffffffffffffffff RBP: 00007fc505008bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc505216038 R14: 00007fc505215fa0 R15: 00007ffcead6f568 task:syz.0.99 state:R running task stack:25432 pid:6360 tgid:6339 ppid:5825 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x14ef/0x4fb0 kernel/sched/core.c:6863 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7047 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __local_bh_enable_ip+0xe1/0x130 kernel/softirq.c:457 local_bh_enable include/linux/bottom_half.h:33 [inline] bpf_test_run+0x3a8/0x830 net/bpf/test_run.c:426 bpf_prog_test_run_skb+0xd66/0x1d50 net/bpf/test_run.c:1158 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4701 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6223 __do_sys_bpf kernel/bpf/syscall.c:6318 [inline] __se_sys_bpf kernel/bpf/syscall.c:6316 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6316 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc504f9acb9 RSP: 002b:00007fc505db2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fc505216270 RCX: 00007fc504f9acb9 RDX: 000000000000002c RSI: 0000200000000080 RDI: 000000000000000a RBP: 00007fc505008bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc505216308 R14: 00007fc505216270 R15: 00007ffcead6f568 rcu: rcu_preempt kthread starved for 3766 jiffies! g10569 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:28008 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x14ef/0x4fb0 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0x164/0x360 kernel/sched/core.c:6960 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x312/0x1560 kernel/rcu/tree.c:2083 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:2285 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 3699 Comm: kworker/u8:13 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xce5/0x1270 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 94 b4 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 3f b0 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 23 b0 RSP: 0018:ffffc9000cd376a0 EFLAGS: 00000293 RAX: ffffffff81b6d14d RBX: 1ffff110170e8129 RCX: ffff888031355b80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000cd377e0 R08: ffffffff8fced377 R09: 1ffffffff1f9da6e R10: dffffc0000000000 R11: fffffbfff1f9da6f R12: ffff8880b8740948 R13: dffffc0000000000 R14: ffff8880b863bb00 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888125929000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f21e1359070 CR3: 000000000e146000 CR4: 00000000003526f0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2711 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2921 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xab/0x250 mm/kfence/core.c:874 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0x89f/0xd90 kernel/workqueue.c:3421 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246