INFO: rcu detected stall in vma_merge_new

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
2a26ce69-b9ae-47f1-ab56-dad0097c3f6e	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	INFO: rcu detected stall in vma_merge_new_range (3)	2026/05/19 01:57	2026/05/19 01:57	2026/05/19 02:46	9f74d39908454b73546eaf1b8211b48b66e5c0fe

Title	Replies (including bot)	Last reply
[syzbot] Monthly bpf report (Feb 2026)	0 (1)	2026/02/06 14:30
[syzbot] [bpf?] INFO: rcu detected stall in vma_merge_new_range (3)	0 (2)	2026/01/27 11:20

Title

Replies (including bot)

Last reply

[syzbot] Monthly bpf report (Feb 2026)

0 (1)

2026/02/06 14:30

[syzbot] [bpf?] INFO: rcu detected stall in vma_merge_new_range (3)

0 (2)

2026/01/27 11:20

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in vma_merge_new_range mm	1				2	355d	385d	0/29	auto-obsoleted due to no activity on 2025/09/01 11:32
upstream	INFO: rcu detected stall in vma_merge_new_range (2) mm	1				1	228d	228d	0/29	auto-obsoleted due to no activity on 2026/01/06 06:35

Rank 🛈

upstream

INFO: rcu detected stall in vma_merge_new_range mm

355d

385d

0/29

auto-obsoleted due to no activity on 2025/09/01 11:32

upstream

INFO: rcu detected stall in vma_merge_new_range (2) mm

228d

0/29

auto-obsoleted due to no activity on 2026/01/06 06:35

Created	Duration	User	Patch	Repo	Result
2026/05/05 05:19	37m	retest repro		upstream	report log
2026/02/07 23:25	22m	retest repro		upstream	report log
2026/01/27 11:20	1h38m	kartikey406@gmail.com	patch	upstream	error

Created

Duration

User

Patch

Repo

Result

2026/05/05 05:19

37m

retest repro

upstream

report log

2026/02/07 23:25

22m

retest repro

upstream

report log

2026/01/27 11:20

1h38m

kartikey406@gmail.com

patch

upstream

error

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6397/1:b..l rcu: (detected by 0, t=10503 jiffies, g=12021, q=830 ncpus=2) task:sed state:R running task stack:25736 pid:6397 tgid:6397 ppid:6396 task_flags:0x400000 flags:0x00080000 Call Trace: <TASK> context_switch kernel/sched/core.c:5260 [inline] __schedule+0xfe4/0x5e10 kernel/sched/core.c:6867 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7194 irqentry_exit+0x17b/0x670 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_release+0x19e/0x2e0 kernel/locking/lockdep.c:5893 Code: ff 65 0f c1 05 5b 5d 01 12 83 f8 01 0f 85 f7 00 00 00 9c 58 f6 c4 02 0f 85 0c 01 00 00 41 f7 c6 00 02 00 00 0f 85 99 00 00 00 <48> 8b 44 24 10 65 48 2b 05 ed 15 01 12 0f 85 0f 01 00 00 48 83 c4 RSP: 0018:ffffc9000454eec8 EFLAGS: 00000206 RAX: 0000000000000046 RBX: ffffffff8e5e3360 RCX: ffffc9000454eed4 RDX: 0000000000000001 RSI: ffffffff8dc1f455 RDI: ffffffff8bfa35a0 RBP: ffffffff821833aa R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802ff00000 R13: ffffc9000454f028 R14: 0000000000000206 R15: 0000000000000002 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:897 [inline] is_bpf_text_address+0x8f/0x1a0 kernel/bpf/core.c:746 kernel_text_address kernel/extable.c:125 [inline] kernel_text_address+0x8d/0x100 kernel/extable.c:94 __kernel_text_address+0xd/0x30 kernel/extable.c:79 unwind_get_return_address+0x59/0xa0 arch/x86/kernel/unwind_orc.c:385 arch_stack_walk+0xa6/0xf0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x2ad/0x780 mm/slub.c:5270 mt_alloc_one lib/maple_tree.c:174 [inline] mas_alloc_nodes+0x280/0x390 lib/maple_tree.c:1110 mas_preallocate+0x39c/0xf10 lib/maple_tree.c:5194 vma_iter_prealloc mm/vma.h:505 [inline] commit_merge+0x3e3/0xbd0 mm/vma.c:751 vma_expand+0x7c3/0xd50 mm/vma.c:1200 vma_merge_new_range+0x2ce/0xa30 mm/vma.c:1099 __mmap_region+0x85d/0x2820 mm/vma.c:2747 mmap_region+0x180/0x3e0 mm/vma.c:2830 do_mmap+0xc63/0x12f0 mm/mmap.c:558 vm_mmap_pgoff+0x29e/0x470 mm/util.c:581 ksys_mmap_pgoff+0x328/0x5b0 mm/mmap.c:604 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3f299f3242 RSP: 002b:00007ffdac2ae3a8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f3f2989b000 RCX: 00007f3f299f3242 RDX: 0000000000000001 RSI: 0000000000057000 RDI: 00007f3f2989b000 RBP: 0000000000000812 R08: 0000000000000003 R09: 0000000000176000 R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffdac2ae430 R13: 00007f3f299c75f0 R14: 00007ffdac2aebe0 R15: 00000fffb5855c78 </TASK> rcu: rcu_preempt kthread starved for 10551 jiffies! g12021 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 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:29112 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: <TASK> context_switch kernel/sched/core.c:5260 [inline] __schedule+0xfe4/0x5e10 kernel/sched/core.c:6867 __schedule_loop kernel/sched/core.c:6949 [inline] schedule+0xdd/0x390 kernel/sched/core.c:6964 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1a9/0xb00 kernel/rcu/tree.c:2083 rcu_gp_kthread+0x21e/0x320 kernel/rcu/tree.c:2285 kthread+0x3b3/0x730 kernel/kthread.c:463 ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 </TASK> rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 RIP: 0010:mac80211_hwsim_tx_frame_no_nl.isra.0+0x3e6/0x1370 drivers/net/wireless/virtual/mac80211_hwsim.c:1814 Code: fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 23 0f 00 00 41 02 9d 4c 01 00 00 <88> 9c 24 e6 00 00 00 e8 ce f5 f2 fa 49 8d bc 24 b8 3e 00 00 48 b8 RSP: 0018:ffffc90000007b18 EFLAGS: 00000296 RAX: 0000000000000007 RBX: 00000000ffffffe2 RCX: ffffffff87140972 RDX: 0000000000000000 RSI: ffffffff871409ee RDI: ffff888030b16bac RBP: ffff888032dfe500 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880333c3100 R13: ffff888030b16a60 R14: ffff8880333c3398 R15: 0000000000070000 FS: 0000000000000000(0000) GS:ffff8881245dc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f77ff200000 CR3: 0000000028289000 CR4: 00000000003526f0 Call Trace: <IRQ> mac80211_hwsim_tx_frame+0x1f6/0x2a0 drivers/net/wireless/virtual/mac80211_hwsim.c:2264 __mac80211_hwsim_beacon_tx drivers/net/wireless/virtual/mac80211_hwsim.c:2281 [inline] mac80211_hwsim_beacon_tx+0x57e/0xa00 drivers/net/wireless/virtual/mac80211_hwsim.c:2365 __iterate_interfaces+0x2e6/0x650 net/mac80211/util.c:761 ieee80211_iterate_active_interfaces_atomic+0x71/0x1b0 net/mac80211/util.c:797 mac80211_hwsim_beacon+0x105/0x1b0 drivers/net/wireless/virtual/mac80211_hwsim.c:2395 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x516/0x990 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858 handle_softirqs+0x1ea/0x910 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xef/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82 Code: 76 78 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 cc 14 00 fb f4 <e9> fc 31 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffffff8e207e00 EFLAGS: 00000242 RAX: 000000000015e0e3 RBX: ffffffff8e297ac0 RCX: ffffffff8b76b4b5 RDX: 0000000000000000 RSI: ffffffff8dc45440 RDI: ffffffff8bfa35a0 RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed101708673d R10: ffff8880b84339eb R11: 0000000000000000 R12: fffffbfff1c52f58 R13: 0000000000000000 R14: ffffffff90b737d0 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x9/0x10 arch/x86/kernel/process.c:767 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0x35b/0x4b0 kernel/sched/idle.c:332 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430 rest_init+0x251/0x260 init/main.c:757 start_kernel+0x47a/0x480 init/main.c:1206 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x122/0x130 arch/x86/kernel/head64.c:291 common_startup_64+0x13e/0x148 </TASK>

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/01/24 20:16	upstream	62085877ae65	40acda8a	.config	console log	report	syz / log			[disk image] [vmlinux] [kernel image]	ci-upstream-kasan-gce-selinux-root	INFO: rcu detected stall in vma_merge_new_range
2026/04/21 00:39	upstream	c1f49dea2b8f	e65da4ee	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-qemu-gce-upstream-auto	INFO: rcu detected stall in vma_merge_new_range

Crashes (2):

Assets (help?)