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INFO: rcu detected stall in sys_setsockopt

Status: upstream: reported on 2026/02/13 08:47
Reported-by: syzbot+035e355f20769f1e35a0@syzkaller.appspotmail.com
First crash: 3d15h, last: 3d15h
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_setsockopt (2) kvm 1 2 1664d 1705d 0/29 auto-closed as invalid on 2021/10/27 00:02
upstream INFO: rcu detected stall in sys_setsockopt kvm 1 1 1826d 1826d 0/29 auto-closed as invalid on 2021/05/17 17:51
upstream INFO: rcu detected stall in sys_setsockopt (4) mm 1 C done inconclusive 62 3d06h 448d 0/29 upstream: reported C repro on 2024/11/25 08:53
upstream INFO: rcu detected stall in sys_setsockopt (3) net 1 4 1536d 1563d 0/29 closed as invalid on 2022/02/08 10:00
linux-4.19 BUG: soft lockup in sys_setsockopt 1 3 1758d 1786d 0/1 auto-closed as invalid on 2021/08/23 07:10

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10394 ticks this GP) idle=dcfc/1/0x4000000000000000 softirq=22083/22114 fqs=3
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   668057        132            0
rcu: 	cputime:    12899       3858            5   ==> 16760(ms)
rcu: 	(t=10500 jiffies g=23061 q=615 ncpus=2)
rcu: rcu_preempt kthread starved for 1674 jiffies! g23061 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:27312 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x313/0x1590 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
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 7052 Comm: syz.7.277 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:ieee80211_sdata_running net/mac80211/ieee80211_i.h:2040 [inline]
RIP: 0010:__ieee80211_rx_handle_packet net/mac80211/rx.c:5271 [inline]
RIP: 0010:ieee80211_rx_list+0x259c/0x32d0 net/mac80211/rx.c:5437
Code: 00 00 00 e8 86 76 e0 f7 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 f7 e8 a7 74 e0 f7 49 8b 1e <89> de 83 e6 01 31 ff e8 c8 4f 88 f7 f6 c3 01 75 0a e8 7e 4b 88 f7
RSP: 0018:ffffc900001f09e0 EFLAGS: 00000246
RAX: 1ffff110060b0ab5 RBX: 0000000000000001 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880305855a8
RBP: ffffc900001f0c30 R08: ffff8880305855af R09: 1ffff110060b0ab5
R10: dffffc0000000000 R11: ffffed10060b0ab6 R12: ffff888030584c80
R13: ffff888077ef2938 R14: ffff8880305855a8 R15: ffff88805eb17000
FS:  00007fe99d8516c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000000c0 CR3: 0000000075f7e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ieee80211_rx_napi+0x1b2/0x3d0 net/mac80211/rx.c:5460
 ieee80211_rx include/net/mac80211.h:4971 [inline]
 ieee80211_handle_queued_frames+0x106/0x1a0 net/mac80211/main.c:319
 tasklet_action_common+0x302/0x4d0 kernel/softirq.c:809
 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+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:schedule_debug kernel/sched/core.c:5958 [inline]
RIP: 0010:__schedule+0x210/0x45a0 kernel/sched/core.c:6591
Code: 74 28 80 3d 06 0a e9 03 00 75 1f c6 05 fd 09 e9 03 01 48 c7 c7 40 54 ca 8a be 46 17 00 00 48 c7 c2 c0 5a ca 8a e8 d0 7c dc f6 <e8> 7b 09 f8 ff 85 c0 74 46 48 c7 c7 60 20 13 8d be ff ff ff ff e8
RSP: 0018:ffffc9000463eee0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90004638000 RCX: 070b35d8f3168f00
RDX: 0000000000000000 RSI: ffffffff8acada80 RDI: ffffffff8b1c81e0
RBP: ffffc9000463f0f0 R08: ffffc9000463f07f R09: 0000000000000000
R10: ffffc9000463f070 R11: fffff520008c7e10 R12: 1ffff920008c7dfc
R13: ffff8880b8f00000 R14: dffffc0000000000 R15: 0000000000000001
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 unwind_next_frame+0x200f/0x2970 arch/x86/kernel/unwind_orc.c:672
 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+0x2e/0x50 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1e0 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+0xf8/0x270 mm/slub.c:3852
 kfree_skb include/linux/skbuff.h:1232 [inline]
 tipc_sk_proto_rcv+0x79b/0x1790 net/tipc/socket.c:2185
 tipc_sk_filter_rcv+0x2ea6/0x30d0 net/tipc/socket.c:2355
 tipc_sk_backlog_rcv+0x147/0x270 net/tipc/socket.c:2410
 sk_backlog_rcv include/net/sock.h:1142 [inline]
 __release_sock+0x1e5/0x460 net/core/sock.c:3011
 release_sock+0x5f/0x1c0 net/core/sock.c:3550
 tipc_setsockopt+0x7aa/0x990 net/tipc/socket.c:3219
 do_sock_setsockopt+0x175/0x1a0 net/socket.c:2321
 __sys_setsockopt net/socket.c:2344 [inline]
 __do_sys_setsockopt net/socket.c:2353 [inline]
 __se_sys_setsockopt net/socket.c:2350 [inline]
 __x64_sys_setsockopt+0x182/0x200 net/socket.c:2350
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe99c99bf79
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:00007fe99d851028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fe99cc15fa0 RCX: 00007fe99c99bf79
RDX: 0000000000000087 RSI: 000000000000010f RDI: 0000000000000009
RBP: 00007fe99ca327e0 R08: 0000000000000043 R09: 0000000000000000
R10: 00002000000008c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe99cc16038 R14: 00007fe99cc15fa0 R15: 00007ffc31e3dca8
 </TASK>
CPU: 1 PID: 7052 Comm: syz.7.277 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:ieee80211_sdata_running net/mac80211/ieee80211_i.h:2040 [inline]
RIP: 0010:__ieee80211_rx_handle_packet net/mac80211/rx.c:5271 [inline]
RIP: 0010:ieee80211_rx_list+0x259c/0x32d0 net/mac80211/rx.c:5437
Code: 00 00 00 e8 86 76 e0 f7 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 f7 e8 a7 74 e0 f7 49 8b 1e <89> de 83 e6 01 31 ff e8 c8 4f 88 f7 f6 c3 01 75 0a e8 7e 4b 88 f7
RSP: 0018:ffffc900001f09e0 EFLAGS: 00000246
RAX: 1ffff110060b0ab5 RBX: 0000000000000001 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880305855a8
RBP: ffffc900001f0c30 R08: ffff8880305855af R09: 1ffff110060b0ab5
R10: dffffc0000000000 R11: ffffed10060b0ab6 R12: ffff888030584c80
R13: ffff888077ef2938 R14: ffff8880305855a8 R15: ffff88805eb17000
FS:  00007fe99d8516c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000000c0 CR3: 0000000075f7e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ieee80211_rx_napi+0x1b2/0x3d0 net/mac80211/rx.c:5460
 ieee80211_rx include/net/mac80211.h:4971 [inline]
 ieee80211_handle_queued_frames+0x106/0x1a0 net/mac80211/main.c:319
 tasklet_action_common+0x302/0x4d0 kernel/softirq.c:809
 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+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:schedule_debug kernel/sched/core.c:5958 [inline]
RIP: 0010:__schedule+0x210/0x45a0 kernel/sched/core.c:6591
Code: 74 28 80 3d 06 0a e9 03 00 75 1f c6 05 fd 09 e9 03 01 48 c7 c7 40 54 ca 8a be 46 17 00 00 48 c7 c2 c0 5a ca 8a e8 d0 7c dc f6 <e8> 7b 09 f8 ff 85 c0 74 46 48 c7 c7 60 20 13 8d be ff ff ff ff e8
RSP: 0018:ffffc9000463eee0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90004638000 RCX: 070b35d8f3168f00
RDX: 0000000000000000 RSI: ffffffff8acada80 RDI: ffffffff8b1c81e0
RBP: ffffc9000463f0f0 R08: ffffc9000463f07f R09: 0000000000000000
R10: ffffc9000463f070 R11: fffff520008c7e10 R12: 1ffff920008c7dfc
R13: ffff8880b8f00000 R14: dffffc0000000000 R15: 0000000000000001
 preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 unwind_next_frame+0x200f/0x2970 arch/x86/kernel/unwind_orc.c:672
 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+0x2e/0x50 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1e0 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+0xf8/0x270 mm/slub.c:3852
 kfree_skb include/linux/skbuff.h:1232 [inline]
 tipc_sk_proto_rcv+0x79b/0x1790 net/tipc/socket.c:2185
 tipc_sk_filter_rcv+0x2ea6/0x30d0 net/tipc/socket.c:2355
 tipc_sk_backlog_rcv+0x147/0x270 net/tipc/socket.c:2410
 sk_backlog_rcv include/net/sock.h:1142 [inline]
 __release_sock+0x1e5/0x460 net/core/sock.c:3011
 release_sock+0x5f/0x1c0 net/core/sock.c:3550
 tipc_setsockopt+0x7aa/0x990 net/tipc/socket.c:3219
 do_sock_setsockopt+0x175/0x1a0 net/socket.c:2321
 __sys_setsockopt net/socket.c:2344 [inline]
 __do_sys_setsockopt net/socket.c:2353 [inline]
 __se_sys_setsockopt net/socket.c:2350 [inline]
 __x64_sys_setsockopt+0x182/0x200 net/socket.c:2350
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe99c99bf79
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:00007fe99d851028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fe99cc15fa0 RCX: 00007fe99c99bf79
RDX: 0000000000000087 RSI: 000000000000010f RDI: 0000000000000009
RBP: 00007fe99ca327e0 R08: 0000000000000043 R09: 0000000000000000
R10: 00002000000008c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe99cc16038 R14: 00007fe99cc15fa0 R15: 00007ffc31e3dca8
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/13 08:46 linux-6.6.y 1b4ef5214f17 6a673c50 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in sys_setsockopt
* Struck through repros no longer work on HEAD.