rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6593/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=15561, q=186 ncpus=2)
task:syz.3.149 state:R running task stack:25864 pid:6593 tgid:6589 ppid:5884 task_flags:0x400040 flags:0x20004002
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288
irqentry_exit+0x6f/0x90 kernel/entry/common.c:197
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 kernel/kcov.c:217
Code: 08 b0 a0 92 65 8b 15 38 01 e1 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c 8b 91 18 16 00 00 <83> fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48 8d 7e 01 8b 89 1c
RSP: 0018:ffffc9001d0bf200 EFLAGS: 00000246
RAX: ffffffff821a5d6b RBX: ffffea000176e280 RCX: ffff88802d3d8000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffea000176e287 R09: 1ffffd40002edc50
R10: dffffc0000000000 R11: fffff940002edc51 R12: dffffc0000000000
R13: 1ffffd40002edc51 R14: ffffea000176e288 R15: 1ffffd40002edc50
folio_test_swapcache include/linux/page-flags.h:632 [inline]
free_swap_cache+0x9b/0x300 mm/swap_state.c:226
__collapse_huge_page_copy_succeeded mm/khugepaged.c:746 [inline]
__collapse_huge_page_copy mm/khugepaged.c:829 [inline]
collapse_huge_page mm/khugepaged.c:1231 [inline]
hpage_collapse_scan_pmd+0x2aa9/0x3c60 mm/khugepaged.c:1436
madvise_collapse+0x3d1/0xa40 mm/khugepaged.c:2813
madvise_vma_behavior+0xec8/0x3af0 mm/madvise.c:1358
madvise_walk_vmas+0x51c/0xa30 mm/madvise.c:1669
madvise_do_behavior+0x38e/0x550 mm/madvise.c:1885
do_madvise+0x1bc/0x270 mm/madvise.c:1978
__do_sys_madvise mm/madvise.c:1987 [inline]
__se_sys_madvise mm/madvise.c:1985 [inline]
__ia32_sys_madvise+0xa7/0xc0 mm/madvise.c:1985
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xb6/0x2b0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fe4539
RSP: 002b:00000000f508155c EFLAGS: 00000206 ORIG_RAX: 00000000000000db
RAX: ffffffffffffffda RBX: 0000000080000000 RCX: 0000000000600003
RDX: 0000000000000019 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu: rcu_preempt kthread timer wakeup didn't happen for 10538 jiffies! g15561 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=7493
rcu: rcu_preempt kthread starved for 10539 jiffies! g15561 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26632 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
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+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6592 Comm: syz.3.149 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 89 fb e8 23 00 00 00 48 8b 3d 14 76 fe 0b 48 89 de 5b e9 e3 9f 58 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 b0 a0 92 65 8b 15 38 01
RSP: 0018:ffffc9001cbff0d8 EFLAGS: 00000297
RAX: 1ffff1100bae7005 RBX: 0000000004000000 RCX: 0000000000080000
RDX: ffffc9000e11a000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9001cbff230 R08: 0000000000000000 R09: ffffffff8a2225c0
R10: dffffc0000000000 R11: fffff5200397fe0c R12: dffffc0000000000
R13: ffff88805d738000 R14: 0000000009000000 R15: ffffc9001cbff6a0
FS: 0000000000000000(0000) GS:ffff888125d15000(0063) knlGS:00000000f54a4b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000033711ffc CR3: 0000000030582000 CR4: 00000000003526f0
Call Trace:
xfrm_state_lookup_spi_proto net/xfrm/xfrm_state.c:1707 [inline]
xfrm_alloc_spi+0x534/0xf30 net/xfrm/xfrm_state.c:2589
xfrm_alloc_userspi+0x70b/0xc90 net/xfrm/xfrm_user.c:1873
xfrm_user_rcv_msg+0x7a0/0xab0 net/xfrm/xfrm_user.c:3501
netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3523
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:729
____sys_sendmsg+0x505/0x830 net/socket.c:2614
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
__sys_sendmsg+0x164/0x220 net/socket.c:2700
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xb6/0x2b0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fe4539
Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f54a455c EFLAGS: 00000206 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000080000080
RDX: 0000000000004810 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000