rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5818/1:b..l P6375/3:b..l P1122/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=12401, q=3604 ncpus=2)
task:kworker/u4:8 state:R running task stack:21000 pid:1122 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7011
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:lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5794
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc900047678a0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0e9dca47160ad500
RDX: 0000000000000000 RSI: ffffffff8acade60 RDI: ffffffff8b1d4020
RBP: ffffc900047679a8 R08: dffffc0000000000 R09: 1ffffffff223e0a0
R10: dffffc0000000000 R11: fffffbfff223e0a1 R12: 1ffff920008ecf20
R13: ffffffff8d1320e0 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
rcu_read_lock include/linux/rcupdate.h:786 [inline]
batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:768 [inline]
batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:848 [inline]
batadv_iv_ogm_schedule+0x45c/0x1080 net/batman-adv/bat_iv_ogm.c:907
batadv_iv_send_outstanding_bat_ogm_packet+0x6ed/0x800 net/batman-adv/bat_iv_ogm.c:1804
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.0.184 state:R running task stack:21800 pid:6375 ppid:5817 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6868
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6892
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:3675
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:5188 [inline]
handle_mm_fault+0x384b/0x4a50 mm/memory.c:5353
faultin_page mm/gup.c:868 [inline]
__get_user_pages+0x604/0x1580 mm/gup.c:1167
__get_user_pages_locked mm/gup.c:1431 [inline]
get_dump_page+0x10c/0x200 mm/gup.c:1939
dump_user_range+0x127/0x840 fs/coredump.c:983
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:2901
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_general_protection+0x168/0x1f0 arch/x86/kernel/traps.c:745
asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:602
RIP: 0033:0x7efe8c59e1a1
RSP: 002b:0000200000000120 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007efe8c825fa0 RCX: 00007efe8c59e199
RDX: 0000200000000140 RSI: 0000200000000120 RDI: 0000000000100000
RBP: 00007efe8c6358e0 R08: 0000200000000200 R09: 0000200000000200
R10: 00002000000001c0 R11: 0000000000000206 R12: 0000000000000000
R13: 00007efe8c826038 R14: 00007efe8c825fa0 R15: 00007ffce6bcf5f8
task:syz-executor state:R running task stack:21640 pid:5818 ppid:5813 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6868
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6892
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]
copy_pte_range mm/memory.c:1107 [inline]
copy_pmd_range mm/memory.c:1168 [inline]
copy_pud_range mm/memory.c:1205 [inline]
copy_p4d_range mm/memory.c:1229 [inline]
copy_page_range+0x2be5/0x3700 mm/memory.c:1323
dup_mmap kernel/fork.c:769 [inline]
dup_mm kernel/fork.c:1700 [inline]
copy_mm+0x1751/0x1e30 kernel/fork.c:1749
copy_process+0x16c9/0x3da0 kernel/fork.c:2510
kernel_clone+0x24b/0x8a0 kernel/fork.c:2919
__do_sys_clone kernel/fork.c:3062 [inline]
__se_sys_clone kernel/fork.c:3046 [inline]
__x64_sys_clone+0x1b7/0x230 kernel/fork.c:3046
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3fad5c6c12
RSP: 002b:00007ffe1a17cc10 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffe1a17cc10 RCX: 00007f3fad5c6c12
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffe1a17cd9c R08: 0000000000000000 R09: 0000000000000001
R10: 000055558255b7d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000000602d4 R15: 00007ffe1a17cdf0
rcu: rcu_preempt kthread starved for 10111 jiffies! g12401 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:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
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: 6437 Comm: syz.3.206 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:393 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:403 [inline]
RIP: 0010:unwind_next_frame+0xeec/0x2990 arch/x86/kernel/unwind_orc.c:585
Code: 04 01 84 c0 0f 85 f4 15 00 00 41 8b 6d 00 31 ff 89 ee e8 b7 d1 4b 00 85 ed 0f 95 c0 4c 39 f3 0f 96 c1 20 c1 4d 39 f7 0f 97 c0 <84> c1 4c 89 f5 0f 84 33 02 00 00 48 89 6c 24 30 48 8d 45 08 48 39
RSP: 0018:ffffc900001f0538 EFLAGS: 00000206
RAX: ffffffff813bc201 RBX: ffffc900001e9000 RCX: 0000000000000101
RDX: ffff888029de8000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffff888029de8000 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: 1ffff9200003e0c3
R13: ffffc900001f0608 R14: ffffc900001f0a60 R15: ffffc900001f1000
FS: 00007f4f5d2766c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f882244aff8 CR3: 0000000053ad6000 CR4: 00000000003506e0
Call Trace:
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
kmem_cache_free+0xf8/0x290 mm/slub.c:3852
inet_frag_rbtree_purge net/ipv4/inet_fragment.c:322 [inline]
inet_frag_destroy+0x179/0x290 net/ipv4/inet_fragment.c:359
inet_frag_putn include/net/inet_frag.h:139 [inline]
ip_expire+0x55b/0x850 net/ipv4/ip_fragment.c:192
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x570/0x810 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x27d/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 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:should_resched arch/x86/include/asm/preempt.h:104 [inline]
RIP: 0010:migrate_enable+0x2c7/0x3c0 kernel/sched/core.c:2453
Code: 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 eb 00 00 00 ff 0b bf 01 00 00 00 e8 a0 b2 ff ff 65 8b 05 11 70 a6 7e <85> c0 74 4f 66 43 c7 44 25 04 f8 f8 43 c6 44 25 06 f8 48 c7 44 24
RSP: 0018:ffffc90018be70c0 EFLAGS: 00000297
RAX: 0000000080000003 RBX: ffff8880b8f3cf50 RCX: 0000000000000000
RDX: ffff888029de8438 RSI: ffffffff8b1d4000 RDI: 00000000ffffffff
RBP: ffffc90018be71b0 R08: ffffc90018be724f R09: 0000000000000000
R10: ffffc90018be7240 R11: fffff5200317ce4a R12: dffffc0000000000
R13: 1ffff9200317ce20 R14: ffffffff8caa0a38 R15: dffffc0000000000
bpf_prog_run_array include/linux/bpf.h:2000 [inline]
trace_call_bpf+0x4c2/0x6c0 kernel/trace/bpf_trace.c:143
perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10295
perf_trace_lock+0x303/0x3b0 include/trace/events/lock.h:50
trace_lock_release include/trace/events/lock.h:69 [inline]
lock_release+0x866/0x8c0 kernel/locking/lockdep.c:5801
page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
set_ptes include/linux/pgtable.h:238 [inline]
copy_present_pte mm/memory.c:979 [inline]
copy_pte_range mm/memory.c:1083 [inline]
copy_pmd_range mm/memory.c:1168 [inline]
copy_pud_range mm/memory.c:1205 [inline]
copy_p4d_range mm/memory.c:1229 [inline]
copy_page_range+0x24fc/0x3700 mm/memory.c:1323
dup_mmap kernel/fork.c:769 [inline]
dup_mm kernel/fork.c:1700 [inline]
copy_mm+0x1751/0x1e30 kernel/fork.c:1749
copy_process+0x16c9/0x3da0 kernel/fork.c:2510
kernel_clone+0x24b/0x8a0 kernel/fork.c:2919
__do_sys_clone kernel/fork.c:3062 [inline]
__se_sys_clone kernel/fork.c:3046 [inline]
__x64_sys_clone+0x1b7/0x230 kernel/fork.c:3046
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4f5c39e199
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:00007f4f5d275fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f4f5c625fa0 RCX: 00007f4f5c39e199
RDX: 0000000000000000 RSI: 00000000fffffeb0 RDI: 0000000002000400
RBP: 00007f4f5c4358e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f4f5c626038 R14: 00007f4f5c625fa0 R15: 00007ffcee7bc7f8