rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=6b74/1/0x4000000000000000 softirq=16025/16026 fqs=0 rcu: (detected by 1, t=10502 jiffies, g=13433, q=344 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6244 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline] RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:151 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x8e/0x110 kernel/locking/spinlock.c:194 Code: 83 c7 18 48 8b 75 08 e8 b0 4b 4d f6 4c 89 f7 e8 08 e3 4d f6 f7 c3 00 02 00 00 74 05 e8 bb ab 77 f6 48 c7 44 24 20 00 00 00 00 <9c> 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf RSP: 0018:ffffc90000007c80 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000012 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff99c54868 RBP: ffffc90000007d08 R08: ffffffff99c5486b R09: 1ffffffff338a90d R10: dffffc0000000000 R11: fffffbfff338a90e R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffffff99c54868 R15: 1ffff92000000f90 FS: 0000555575fc5500(0000) GS:ffff888125d06000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31015ff8 CR3: 0000000046a21000 CR4: 0000000000350ef0 Call Trace: debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline] debug_deactivate+0x1d/0x200 kernel/time/hrtimer.c:483 __run_hrtimer kernel/time/hrtimer.c:1745 [inline] __hrtimer_run_queues+0x2b0/0xc60 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_flush_all+0x7f4/0xb10 arch/x86/include/asm/irqflags.h:-1 Code: ff ff e8 2f b2 1f 00 90 0f 0b 90 e9 62 fc ff ff e8 21 b2 1f 00 e8 5c 30 ad 09 48 85 db 74 c0 e8 12 b2 1f 00 fb 48 8b 5c 24 18 <48> 8b 44 24 20 42 80 3c 20 00 74 08 48 89 df e8 08 67 85 00 48 8b RSP: 0018:ffffc9000b716640 EFLAGS: 00000293 RAX: ffffffff81a091be RBX: ffffffff8e97bbd8 RCX: ffff88807a99bc80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000b716790 R08: ffffffff8f9e1577 R09: 1ffffffff1f3c2ae R10: dffffc0000000000 R11: fffffbfff1f3c2af R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000000 R15: ffffffff8e97bb80 __console_flush_and_unlock kernel/printk/printk.c:3258 [inline] console_unlock+0xbb/0x190 kernel/printk/printk.c:3298 vprintk_emit+0x4c5/0x590 kernel/printk/printk.c:2423 _printk+0xcf/0x120 kernel/printk/printk.c:2448 netdev_info+0x10a/0x160 net/core/dev.c:12771 bond_enslave+0x2c6d/0x3870 drivers/net/bonding/bond_main.c:2328 do_set_master+0x533/0x6d0 net/core/rtnetlink.c:2956 do_setlink+0xcf0/0x41c0 net/core/rtnetlink.c:3158 rtnl_changelink net/core/rtnetlink.c:3769 [inline] __rtnl_newlink net/core/rtnetlink.c:3928 [inline] rtnl_newlink+0x1619/0x1c80 net/core/rtnetlink.c:4065 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6954 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 __sys_sendto+0x3bd/0x520 net/socket.c:2244 __do_sys_sendto net/socket.c:2251 [inline] __se_sys_sendto net/socket.c:2247 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2247 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6798190e5c Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b RSP: 002b:00007ffe07ffff80 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f6798f14620 RCX: 00007f6798190e5c RDX: 0000000000000028 RSI: 00007f6798f14670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffe07ffffd4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f6798f14670 R15: 0000000000000000 rcu: rcu_preempt kthread starved for 10502 jiffies! g13433 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:27288 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0x165/0x360 kernel/sched/core.c:7026 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 0 PID: 6332 Comm: syz.1.84 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xd38/0x12d0 kernel/smp.c:877 Code: 89 ee 83 e6 01 31 ff e8 96 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 41 6f 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 25 6f 0b 00 eb e4 44 RSP: 0018:ffffc9000b727700 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff110170c8441 RCX: 0000000000080000 RDX: ffffc90004712000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc9000b727880 R08: ffffffff8f9e1577 R09: 1ffffffff1f3c2ae R10: dffffc0000000000 R11: fffffbfff1f3c2af R12: ffff8880b8642208 R13: dffffc0000000000 R14: ffff8880b873b240 R15: 0000000000000000 FS: 00007fa8d22096c0(0000) GS:ffff888125e06000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa8d1371980 CR3: 000000006b05f000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 kill_bdev block/bdev.c:90 [inline] set_blocksize+0x320/0x500 block/bdev.c:207 sb_set_blocksize+0xb3/0x180 block/bdev.c:224 fat_fill_super+0xf06/0x3570 fs/fat/inode.c:1631 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 vfs_get_tree+0x92/0x2b0 fs/super.c:1751 fc_mount fs/namespace.c:1208 [inline] do_new_mount_fc fs/namespace.c:3651 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3727 do_mount fs/namespace.c:4050 [inline] __do_sys_mount fs/namespace.c:4238 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4215 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa8d139076a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007fa8d2208e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa8d2208ef0 RCX: 00007fa8d139076a RDX: 00002000000001c0 RSI: 0000200000000040 RDI: 00007fa8d2208eb0 RBP: 00002000000001c0 R08: 00007fa8d2208ef0 R09: 0000000001000000 R10: 0000000001000000 R11: 0000000000000246 R12: 0000200000000040 R13: 00007fa8d2208eb0 R14: 000000000000026f R15: 0000200000000500 watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [syz.1.84:6332] Modules linked in: irq event stamp: 1448700 hardirqs last enabled at (1448699): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:214 hardirqs last disabled at (1448700): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (1448698): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (1448698): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (1448698): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (1448661): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (1448661): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (1448661): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 6332 Comm: syz.1.84 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:native_pause arch/x86/include/asm/vdso/processor.h:13 [inline] RIP: 0010:cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xd31/0x12d0 kernel/smp.c:877 Code: 00 00 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 96 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 41 6f 0b 00 eb 38 90 42 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 RSP: 0018:ffffc9000b727700 EFLAGS: 00000246 RAX: ffffffff81b4d4ab RBX: 1ffff110170c8441 RCX: 0000000000080000 RDX: ffffc90004712000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc9000b727880 R08: ffffffff8f9e1577 R09: 1ffffffff1f3c2ae R10: dffffc0000000000 R11: fffffbfff1f3c2af R12: ffff8880b8642208 R13: dffffc0000000000 R14: ffff8880b873b240 R15: 0000000000000000 FS: 00007fa8d22096c0(0000) GS:ffff888125e06000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa8d1371980 CR3: 000000006b05f000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 kill_bdev block/bdev.c:90 [inline] set_blocksize+0x320/0x500 block/bdev.c:207 sb_set_blocksize+0xb3/0x180 block/bdev.c:224 fat_fill_super+0xf06/0x3570 fs/fat/inode.c:1631 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 vfs_get_tree+0x92/0x2b0 fs/super.c:1751 fc_mount fs/namespace.c:1208 [inline] do_new_mount_fc fs/namespace.c:3651 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3727 do_mount fs/namespace.c:4050 [inline] __do_sys_mount fs/namespace.c:4238 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4215 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa8d139076a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007fa8d2208e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa8d2208ef0 RCX: 00007fa8d139076a RDX: 00002000000001c0 RSI: 0000200000000040 RDI: 00007fa8d2208eb0 RBP: 00002000000001c0 R08: 00007fa8d2208ef0 R09: 0000000001000000 R10: 0000000001000000 R11: 0000000000000246 R12: 0000200000000040 R13: 00007fa8d2208eb0 R14: 000000000000026f R15: 0000200000000500 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6244 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:222 [inline] RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:233 [inline] RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline] RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:646 [inline] RIP: 0010:cpu_online include/linux/cpumask.h:1205 [inline] RIP: 0010:trace_hrtimer_expire_exit include/trace/events/timer.h:306 [inline] RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1780 [inline] RIP: 0010:__hrtimer_run_queues+0x592/0xc60 kernel/time/hrtimer.c:1841 Code: 41 83 fd 07 0f 87 98 01 00 00 e8 a9 5c 12 00 45 89 ef 41 c1 ed 06 4a 8d 3c ed 70 15 9e 8f be 08 00 00 00 e8 10 14 78 00 31 f6 <4c> 0f a3 3d 26 2e f0 0d 41 0f 92 c7 40 0f 92 c6 bf 02 00 00 00 e8 RSP: 0018:ffffc90000007d40 EFLAGS: 00000046 RAX: ffffffff81ade701 RBX: ffff8880b8627d08 RCX: ffffffff81ade740 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8f9e1570 RBP: ffffc90000007e90 R08: ffffffff8f9e1577 R09: 1ffffffff1f3c2ae R10: dffffc0000000000 R11: fffffbfff1f3c2af R12: ffff88802ebb4340 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 FS: 0000555575fc5500(0000) GS:ffff888125d06000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31015ff8 CR3: 0000000046a21000 CR4: 0000000000350ef0 Call Trace: hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_flush_all+0x7f4/0xb10 arch/x86/include/asm/irqflags.h:-1 Code: ff ff e8 2f b2 1f 00 90 0f 0b 90 e9 62 fc ff ff e8 21 b2 1f 00 e8 5c 30 ad 09 48 85 db 74 c0 e8 12 b2 1f 00 fb 48 8b 5c 24 18 <48> 8b 44 24 20 42 80 3c 20 00 74 08 48 89 df e8 08 67 85 00 48 8b RSP: 0018:ffffc9000b716640 EFLAGS: 00000293 RAX: ffffffff81a091be RBX: ffffffff8e97bbd8 RCX: ffff88807a99bc80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000b716790 R08: ffffffff8f9e1577 R09: 1ffffffff1f3c2ae R10: dffffc0000000000 R11: fffffbfff1f3c2af R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000000 R15: ffffffff8e97bb80 __console_flush_and_unlock kernel/printk/printk.c:3258 [inline] console_unlock+0xbb/0x190 kernel/printk/printk.c:3298 vprintk_emit+0x4c5/0x590 kernel/printk/printk.c:2423 _printk+0xcf/0x120 kernel/printk/printk.c:2448 netdev_info+0x10a/0x160 net/core/dev.c:12771 bond_enslave+0x2c6d/0x3870 drivers/net/bonding/bond_main.c:2328 do_set_master+0x533/0x6d0 net/core/rtnetlink.c:2956 do_setlink+0xcf0/0x41c0 net/core/rtnetlink.c:3158 rtnl_changelink net/core/rtnetlink.c:3769 [inline] __rtnl_newlink net/core/rtnetlink.c:3928 [inline] rtnl_newlink+0x1619/0x1c80 net/core/rtnetlink.c:4065 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6954 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 __sys_sendto+0x3bd/0x520 net/socket.c:2244 __do_sys_sendto net/socket.c:2251 [inline] __se_sys_sendto net/socket.c:2247 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2247 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6798190e5c Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b RSP: 002b:00007ffe07ffff80 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f6798f14620 RCX: 00007f6798190e5c RDX: 0000000000000028 RSI: 00007f6798f14670 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffe07ffffd4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 R13: 0000000000000000 R14: 00007f6798f14670 R15: 0000000000000000