rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6236/1:b..l P5780/1:b..l P6313/3:b..l
rcu: (detected by 1, t=10502 jiffies, g=15353, q=545 ncpus=2)
task:syz.0.103 state:R running task stack:25384 pid:6313 ppid:5790 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5393 [inline]
__schedule+0x15ae/0x4700 kernel/sched/core.c:6722
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6889
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6913
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3a/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
filemap_map_pages+0x1279/0x19c0 mm/filemap.c:3666
do_fault_around mm/memory.c:4595 [inline]
do_read_fault mm/memory.c:4628 [inline]
do_fault mm/memory.c:4775 [inline]
do_pte_missing mm/memory.c:3689 [inline]
handle_pte_fault mm/memory.c:5047 [inline]
__handle_mm_fault mm/memory.c:5190 [inline]
handle_mm_fault+0x3845/0x4a40 mm/memory.c:5355
do_user_addr_fault+0xad2/0x12d0 arch/x86/mm/fault.c:1322
handle_page_fault arch/x86/mm/fault.c:1463 [inline]
exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f6040273d80
RSP: 002b:00007ffc70307110 EFLAGS: 00010202
RAX: 000000110c458000 RBX: ffffffff8aa08993 RCX: 0000000000000002
RDX: 0000000000000993 RSI: 0000000000000226 RDI: 0000000000000004
RBP: 0000000000000000 R08: 00007f6040610000 R09: 00007f6040612000
R10: 000000008aa08997 R11: 0000000000000008 R12: 00007f6040626038
R13: 0000000000000769 R14: ffffffff8aa08d80 R15: 00007f6041155720
task:kworker/0:3 state:R running task stack:25032 pid:5780 ppid:2 flags:0x00004000
Workqueue: events_power_efficient gc_worker
Call Trace:
context_switch kernel/sched/core.c:5393 [inline]
__schedule+0x15ae/0x4700 kernel/sched/core.c:6722
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7032
irqentry_exit+0x67/0x70 kernel/entry/common.c:441
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:seqcount_lockdep_reader_access+0x19a/0x1d0 include/linux/seqlock.h:105
Code: f8 4d 85 e4 75 16 e8 e5 2e bc f8 eb 15 e8 de 2e bc f8 e8 d9 4a cb 01 4d 85 e4 74 ea e8 cf 2e bc f8 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 43 c7 44 3e 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc9000478f9a0 EFLAGS: 00000293
RAX: ffffffff88cba511 RBX: 0000000000000000 RCX: ffff88802db7bc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000478fa50 R08: ffffffff9222358f R09: 1ffffffff24446b1
R10: dffffc0000000000 R11: fffffbfff24446b2 R12: 0000000000000200
R13: 0000000000000000 R14: 1ffff920008f1f34 R15: dffffc0000000000
nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:343 [inline]
gc_worker+0x323/0x18e0 net/netfilter/nf_conntrack_core.c:1486
process_one_work kernel/workqueue.c:2657 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
task:syz.3.83 state:R running task stack:22824 pid:6236 ppid:5795 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5393 [inline]
__schedule+0x15ae/0x4700 kernel/sched/core.c:6722
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7032
irqentry_exit+0x67/0x70 kernel/entry/common.c:441
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:692
RIP: 0010:xas_load+0x126/0x140 lib/xarray.c:-1
Code: f7 e8 de d4 57 f7 eb 96 44 89 f1 80 e1 07 38 c1 7c bc 4c 89 f7 e8 ca d4 57 f7 eb b2 e8 b3 cf fe f6 eb 0c e8 ac cf fe f6 eb 05 a5 cf fe f6 48 89 d8 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d
RSP: 0018:ffffc9000b8c6ed0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88802e1c8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000000 R08: dffffc0000000000 R09: 1ffffffff24446a0
R10: dffffc0000000000 R11: fffffbfff24446a1 R12: 1ffff1100b52ee88
R13: 0000000000000000 R14: ffff88805a977440 R15: dffffc0000000000
filemap_get_entry+0x182/0x3f0 mm/filemap.c:1852
shmem_get_folio_gfp+0x2a4/0x2b40 mm/shmem.c:1975
shmem_get_folio mm/shmem.c:2164 [inline]
shmem_write_begin+0xf2/0x430 mm/shmem.c:2706
generic_perform_write+0x2fe/0x5c0 mm/filemap.c:4027
shmem_file_write_iter+0xfb/0x120 mm/shmem.c:2883
__kernel_write_iter+0x29f/0x6d0 fs/read_write.c:517
dump_emit_page fs/coredump.c:958 [inline]
dump_user_range+0x418/0x840 fs/coredump.c:985
elf_core_dump+0x320e/0x37c0 fs/binfmt_elf.c:2184
do_coredump+0x1791/0x24a0 fs/coredump.c:834
get_signal+0x10da/0x1390 kernel/signal.c:2913
arch_do_signal_or_restart+0xc2/0x7b0 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213
irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:318
exc_page_fault+0x8c/0x100 arch/x86/mm/fault.c:1519
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7ff5e1d9f561
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007ff5e2026090 RCX: 00007ff5e1d9f559
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007ff5e1e36b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ff5e2026128 R14: 00007ff5e2026090 R15: 00007ffda1836308
rcu: rcu_preempt kthread starved for 10588 jiffies! g15353 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:27848 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5393 [inline]
__schedule+0x15ae/0x4700 kernel/sched/core.c:6722
schedule+0xbd/0x170 kernel/sched/core.c:6796
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:pv_native_safe_halt+0xf/0x10 arch/x86/kernel/paravirt.c:148
Code: e4 34 02 c3 cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d 83 54 51 00 fb f4 66 0f 1f 00 55 41 57 41 56 41 54 53 50 8b 2f eb 2c 89 cb 80 f9
RSP: 0018:ffffc90000187de0 EFLAGS: 000002c6
RAX: 40762335d5050300 RBX: ffffffff81635851 RCX: 40762335d5050300
RDX: 0000000000000001 RSI: ffffffff8aead140 RDI: ffffffff8b3c50e0
RBP: ffffc90000187f20 R08: ffff8880b8d36b6b R09: 1ffff110171a6d6d
R10: dffffc0000000000 R11: ffffed10171a6d6e R12: 1ffff92000030fc8
R13: dffffc0000000000 R14: 1ffff11003c4d780 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8725343a99 CR3: 000000001bfe5000 CR4: 00000000003506e0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:753
default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
cpuidle_idle_call kernel/sched/idle.c:178 [inline]
do_idle+0x221/0x5c0 kernel/sched/idle.c:302
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:401
start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323
secondary_startup_64_no_verify+0x179/0x17b