INFO: rcu detected stall in irqentry_exit

Status: upstream: reported C repro on 2025/08/25 11:36
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+b88c7fb221e9dae9caf0@syzkaller.appspotmail.com
First crash: 356d, last: 55m
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/11/20 linux-6.6.y (ToT) 0a805b6ea8cd C [report] INFO: rcu detected stall in smp_call_function
2025/11/20 upstream (ToT) fd95357fd8c6 C Didn't crash
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: rcu detected stall in irqentry_exit 1 1 729d 729d 0/3 auto-obsoleted due to no activity on 2024/11/25 13:22
linux-5.15 INFO: rcu detected stall in irqentry_exit (2) 1 16 4d06h 334d 0/3 upstream: reported on 2025/09/16 14:07
linux-6.1 INFO: rcu detected stall in irqentry_exit (2) origin:lts-only 1 syz error 5 32d 279d 0/3 upstream: reported syz repro on 2025/11/10 20:44
linux-5.15 INFO: rcu detected stall in irqentry_exit 1 1 797d 797d 0/3 auto-obsoleted due to no activity on 2024/09/18 22:14
upstream INFO: rcu detected stall in irqentry_exit (2) kernel 1 syz, C 1 312d 312d 0/29 closed as invalid on 2026/01/13 17:54
upstream INFO: rcu detected stall in irqentry_exit kernel 1 syz inconclusive inconclusive 2 605d 601d 0/29 auto-obsoleted due to no activity on 2025/03/29 05:27
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/12/12 10:04 2h45m fix candidate upstream OK (0) job log

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=edb4/1/0x4000000000000000 softirq=11754/11754 fqs=5224
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1102720          0            0
rcu: 	cputime:    19181      33298           42   ==> 52490(ms)
rcu: 	(t=10501 jiffies g=10173 q=1172 ncpus=2)
CPU: 0 PID: 5946 Comm: syz.0.19 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:queue_work_on+0x1a4/0x1f0 kernel/workqueue.c:1859
Code: 4d 85 e4 75 16 e8 bc a5 2f 00 eb 15 e8 b5 a5 2f 00 e8 10 fc 34 09 4d 85 e4 74 ea e8 a6 a5 2f 00 fb 48 c7 44 24 20 0e 36 e0 45 <48> b8 00 00 00 00 00 fc ff df 49 c7 44 05 00 00 00 00 00 41 c7 44
RSP: 0000:ffffc90000007380 EFLAGS: 00000246
RAX: ffffffff8157c97a RBX: 0000000000000001 RCX: ffff88807b1c0000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007448 R08: ffffffff911eb5d7 R09: 1ffffffff223d6ba
R10: dffffc0000000000 R11: fffffbfff223d6bb R12: 0000000000000200
R13: 1ffff92000000e74 R14: 0000000000000000 R15: ffff888026248000
FS:  0000555590cf4500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000001c25e CR3: 00000000772d9000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 __ieee80211_queue_skb_to_iface net/mac80211/rx.c:232 [inline]
 ieee80211_queue_skb_to_iface net/mac80211/rx.c:243 [inline]
 ieee80211_rx_h_mgmt+0x4f0/0x6e0 net/mac80211/rx.c:3994
 ieee80211_rx_handlers+0x65b6/0xb450 net/mac80211/rx.c:4152
 ieee80211_invoke_rx_handlers net/mac80211/rx.c:4182 [inline]
 ieee80211_prepare_and_rx_handle+0x27de/0x6080 net/mac80211/rx.c:5040
 ieee80211_rx_for_interface net/mac80211/rx.c:5125 [inline]
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5298 [inline]
 ieee80211_rx_list+0x28d4/0x3240 net/mac80211/rx.c:5437
 ieee80211_rx_napi+0x1ae/0x3c0 net/mac80211/rx.c:5460
 ieee80211_rx include/net/mac80211.h:4971 [inline]
 ieee80211_handle_queued_frames+0x105/0x190 net/mac80211/main.c:319
 tasklet_action_common+0x2d4/0x460 kernel/softirq.c:809
 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:mmdrop include/linux/sched/mm.h:53 [inline]
RIP: 0010:mmdrop_sched include/linux/sched/mm.h:82 [inline]
RIP: 0010:mmdrop_lazy_tlb_sched include/linux/sched/mm.h:109 [inline]
RIP: 0010:finish_task_switch+0x327/0x8f0 kernel/sched/core.c:5281
Code: 42 0f b6 04 30 84 c0 0f 85 a8 02 00 00 f7 03 20 00 00 00 0f 85 94 01 00 00 4c 89 ff be 04 00 00 00 e8 3d 24 82 00 f0 41 ff 0f <0f> 84 a5 00 00 00 81 7d b0 80 00 00 00 0f 84 ad 00 00 00 48 83 c4
RSP: 0000:ffffc900032f7800 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff88807838c348 RCX: ffffffff815dca13
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88807838c280
RBP: ffffc900032f7850 R08: ffff88807838c283 R09: 1ffff1100f071850
R10: dffffc0000000000 R11: ffffed100f071851 R12: ffff88807b1c0540
R13: 1ffff110171c79a9 R14: dffffc0000000000 R15: ffff88807838c280
 context_switch kernel/sched/core.c:5385 [inline]
 __schedule+0x15b6/0x4660 kernel/sched/core.c:6701
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7011
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:task_mm_cid_work+0x4/0x770 kernel/sched/core.c:11965
Code: e1 07 80 c1 03 38 c1 0f 8c 4e ff ff ff 4c 89 ff e8 c1 23 81 00 e9 41 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec c0 00
RSP: 0000:ffffc900032f7bf8 EFLAGS: 00000246
RAX: 1ffff1100f6382b1 RBX: 0000000000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffff88807b1c1580
RBP: ffffc900032f7cb8 R08: ffffffff8e8c7caf R09: 1ffffffff1d18f95
R10: dffffc0000000000 R11: fffffbfff1d18f96 R12: dffffc0000000000
R13: ffff88807b1c1580 R14: ffff88807b1c0a00 R15: ffff88807b1c0968
 task_work_run+0x1d4/0x260 kernel/task_work.c:245
 get_signal+0x11da/0x1390 kernel/signal.c:2687
 arch_do_signal_or_restart+0xc2/0x7b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:315
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0033:0x7f3cef99e017
Code: 83 c8 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
RSP: 002b:00007ffe8dd32238 EFLAGS: 00000246
RAX: 00000000000001b4 RBX: 00007ffe8dd32320 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000001c25e R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2ca20000 R11: 0000000000000000 R12: 0000000000000000
R13: 00007f3cefc25fac R14: 00007f3cefc25fa8 R15: 00007f3cefc25fa0
 </TASK>

Crashes (28):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/03 07:37 linux-6.6.y a1153c0deb44 e611ffe1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/07/19 14:42 linux-6.6.y da47cbc25466 72524a66 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/06/14 21:45 linux-6.6.y 924b4a879cbb 1d2f3589 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/03/04 05:42 linux-6.6.y 7a137e9bfa0e 4180d919 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2025/11/19 04:49 linux-6.6.y 0a805b6ea8cd ef766cd7 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/08/17 04:06 linux-6.6.y d27334b2888c 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/08/16 16:08 linux-6.6.y d27334b2888c 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/07/20 08:20 linux-6.6.y da47cbc25466 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/07/06 01:58 linux-6.6.y da47cbc25466 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/07/03 13:56 linux-6.6.y d1cfde2d5d15 58bf2096 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/06/14 19:11 linux-6.6.y 924b4a879cbb 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/04/06 00:29 linux-6.6.y 08667c1437c0 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/04/05 01:31 linux-6.6.y 08667c1437c0 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/03/20 20:20 linux-6.6.y 4fc00fe35d46 ac6f1dff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/03/08 05:41 linux-6.6.y 4fc00fe35d46 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/03/04 08:02 linux-6.6.y 7a137e9bfa0e 4180d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/02/27 07:52 linux-6.6.y 7a137e9bfa0e a2f13f71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/01/26 09:38 linux-6.6.y cbb31f77b879 55756628 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/01/11 15:06 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/01/06 08:08 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2026/01/05 02:52 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2025/12/18 21:33 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2025/12/16 19:41 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2025/12/16 00:50 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2025/11/26 12:19 linux-6.6.y 1e89a1be4fe9 64219f15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2025/10/10 14:21 linux-6.6.y e617101e5626 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2025/08/28 14:10 linux-6.6.y bb9c90ab9c5a e12e5ba4 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
2025/08/25 11:35 linux-6.6.y bb9c90ab9c5a bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in irqentry_exit
* Struck through repros no longer work on HEAD.