rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-....: (1 GPs behind) idle=89a4/1/0x4000000000000000 softirq=38473/38480 fqs=5246
rcu: hardirqs softirqs csw/system
rcu: number: 1421005 0 0
rcu: cputime: 15210 37279 42 ==> 52500(ms)
rcu: (t=10501 jiffies g=49437 q=584 ncpus=2)
CPU: 1 PID: 12187 Comm: syz.1.1801 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:deref_stack_reg+0x1c5/0x240 arch/x86/kernel/unwind_orc.c:406
Code: c1 4c 39 e0 0f 96 c0 84 c1 74 43 e8 85 bf 4a 00 49 bf 00 00 00 00 00 fc ff df 48 89 ef e8 63 08 00 00 49 89 c6 48 8b 5c 24 20 <48> 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 b5 2e a2 00
RSP: 0018:ffffc900001f0418 EFLAGS: 00000246
RAX: ffffc900001f0b80 RBX: ffffc900001f0588 RCX: ffff88807ba89e00
RDX: 0000000000000100 RSI: 0000000000000002 RDI: ffffc900001f0a10
RBP: ffffc900001f0a10 R08: ffff88807ba89e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc900001f1000
R13: 1ffff9200003e0ab R14: ffffc900001f0b80 R15: dffffc0000000000
FS: 00007fea62e8f6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f01bceaaf98 CR3: 0000000064a87000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
unwind_next_frame+0x1789/0x2970 arch/x86/kernel/unwind_orc.c:648
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
kmem_cache_free+0xf8/0x280 mm/slub.c:3852
tcp_rtx_queue_purge net/ipv4/tcp.c:2992 [inline]
tcp_write_queue_purge+0x203/0x2f0 net/ipv4/tcp.c:3005
tcp_done_with_error+0x43/0xc0 net/ipv4/tcp_input.c:4446
tcp_write_err net/ipv4/tcp_timer.c:72 [inline]
tcp_write_timeout net/ipv4/tcp_timer.c:281 [inline]
tcp_retransmit_timer+0x1c69/0x2fe0 net/ipv4/tcp_timer.c:576
tcp_write_timer+0x12a/0x280 net/ipv4/tcp_timer.c:709
call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700
expire_timers kernel/time/timer.c:1751 [inline]
__run_timers+0x52d/0x7d0 kernel/time/timer.c:2022
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:schedule_debug kernel/sched/core.c:5937 [inline]
RIP: 0010:__schedule+0x150/0x44d0 kernel/sched/core.c:6590
Code: 74 08 48 89 df e8 60 d1 65 f7 48 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 47 d1 65 f7 48 81 3b 9d 6e ac 57 <0f> 85 fc 15 00 00 45 85 e4 44 89 64 24 58 75 4c 48 8b 44 24 18 48
RSP: 0018:ffffc900031e7980 EFLAGS: 00000246
RAX: 1ffff9200063c000 RBX: ffffc900031e0000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc900031e7b00
RBP: ffffc900031e7b70 R08: ffffc900031e7aff R09: 0000000000000000
R10: ffffc900031e7af0 R11: fffff5200063cf60 R12: 0000000000000001
R13: ffff8880b8f00000 R14: dffffc0000000000 R15: 1ffff9200063cf4c
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6866
preempt_schedule+0xab/0xc0 kernel/sched/core.c:6890
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
_raw_spin_unlock_irq+0x40/0x50 kernel/locking/spinlock.c:202
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x1068/0x1400 kernel/signal.c:2867
arch_do_signal_or_restart+0x9c/0x7b0 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fea61f8f749
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:00007fea62e8f038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: 0000000000000005 RBX: 00007fea621e5fa0 RCX: 00007fea61f8f749
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000480
RBP: 00007fea62013f91 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fea621e6038 R14: 00007fea621e5fa0 R15: 00007ffd09ee8088