INFO: rcu detected stall in __sock_create

Status: auto-obsoleted due to no activity on 2025/01/09 18:19
Reported-by: syzbot+98af6fc09289b3da4e76@syzkaller.appspotmail.com
First crash: 791d, last: 689d
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: rcu detected stall in __sock_create (3) 1 19 20d 370d 0/3 upstream: reported on 2025/08/16 13:35
upstream INFO: rcu detected stall in __sock_create mm 1 1 2452d 2452d 0/29 closed as invalid on 2019/12/04 14:04
linux-5.15 INFO: rcu detected stall in __sock_create (2) 1 24 31d 372d 0/3 upstream: reported on 2025/08/14 08:18
linux-6.6 INFO: rcu detected stall in __sock_create 1 15 68d 377d 0/2 upstream: reported on 2025/08/10 05:00
upstream INFO: rcu detected stall in __sock_create (3) mm 1 21 517d 752d 0/29 auto-obsoleted due to no activity on 2025/06/20 21:57
upstream INFO: rcu detected stall in __sock_create (2) mm 1 2 2418d 2418d 0/29 closed as invalid on 2020/01/08 05:33
linux-5.15 INFO: rcu detected stall in __sock_create 1 1 821d 821d 0/3 auto-obsoleted due to no activity on 2024/08/30 14:48
linux-6.1 INFO: rcu detected stall in __sock_create (2) 1 2 525d 558d 0/3 auto-obsoleted due to no activity on 2025/06/22 07:20
android-5-15 BUG: soft lockup in __sock_create 1 18 719d 855d 0/2 auto-obsoleted due to no activity on 2024/11/30 09:28

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=9853, q=860 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294961068-4294950565), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g9853 f0x2 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:27064 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 4013 Comm: syz.3.65 Not tainted 6.1.112-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:60 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:347 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:357 [inline]
RIP: 0010:unwind_next_frame+0xc7c/0x2220 arch/x86/kernel/unwind_orc.c:539
Code: 8b 4c 24 28 0f b6 04 01 84 c0 0f 85 c7 10 00 00 48 8b 44 24 08 4c 8d 68 f8 41 83 3c 24 00 74 1c 4d 39 ee 77 17 4c 39 eb 76 12 <49> 8d 45 08 4c 39 f0 76 09 48 39 d8 0f 86 c7 00 00 00 48 8b 1c 24
RSP: 0018:ffffc900001e03e0 EFLAGS: 00000216
RAX: ffffc900001e0c80 RBX: ffffc900001e1000 RCX: 1ffff9200003c098
RDX: 1ffffffff1e32566 RSI: 0000000000000000 RDI: dffffc0000000000
RBP: 1ffff9200003c09a R08: 0000000000000001 R09: ffffc900001e05b0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc900001e04c0
R13: ffffc900001e0c78 R14: ffffc900001d9000 R15: 1ffff9200003c099
FS:  00007fd4ee3ff6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000cf3d CR3: 00000000633d8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0x10d/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook mm/slub.c:1750 [inline]
 slab_free mm/slub.c:3661 [inline]
 __kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674
 skb_free_head net/core/skbuff.c:762 [inline]
 skb_release_data+0x5de/0x7a0 net/core/skbuff.c:791
 skb_release_all net/core/skbuff.c:856 [inline]
 __kfree_skb+0x4c/0x60 net/core/skbuff.c:870
 tcp_write_queue_purge+0x132/0x2f0 net/ipv4/tcp.c:3099
 tcp_done_with_error+0x3d/0xc0 net/ipv4/tcp_input.c:4366
 tcp_write_err net/ipv4/tcp_timer.c:70 [inline]
 tcp_write_timeout net/ipv4/tcp_timer.c:273 [inline]
 tcp_retransmit_timer+0x12ca/0x2800 net/ipv4/tcp_timer.c:547
 tcp_write_timer+0x12e/0x280 net/ipv4/tcp_timer.c:676
 call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1504
 expire_timers kernel/time/timer.c:1549 [inline]
 __run_timers+0x67c/0x890 kernel/time/timer.c:1820
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
 handle_softirqs+0x2ee/0xa40 kernel/softirq.c:571
 __do_softirq kernel/softirq.c:605 [inline]
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x157/0x240 kernel/softirq.c:654
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:666
 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:preempt_latency_start kernel/sched/core.c:5690 [inline]
RIP: 0010:preempt_count_add+0xb8/0x180 kernel/sched/core.c:5713
Code: 00 85 c0 74 0a 45 31 f6 31 ff e8 a3 59 0d 00 65 48 8b 1d ab f8 a3 7e 48 81 c3 d8 14 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 <74> 08 48 89 df e8 4e bb 83 00 4c 89 33 5b 41 5e 41 5f c3 e8 70 1a
RSP: 0018:ffffc900033cf6a0 EFLAGS: 00000246
RAX: 1ffff110032f929b RBX: ffff8880197c94d8 RCX: ffffffff8ab13d00
RDX: dffffc0000000000 RSI: ffffffff8893ae06 RDI: ffffffff813cb533
RBP: 1ffff92000679ef4 R08: 0000000000000005 R09: ffffc900033cf890
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880197c8000
R13: ffffffff81786c50 R14: ffffffff813cb533 R15: dffffc0000000000
 unwind_next_frame+0xb3/0x2220 arch/x86/kernel/unwind_orc.c:433
 arch_stack_walk+0x10d/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422
 sk_prot_alloc+0x58/0x200 net/core/sock.c:2041
 sk_alloc+0x36/0x350 net/core/sock.c:2100
 unix_create1+0xb4/0x7f0
 unix_create+0x146/0x1f0 net/unix/af_unix.c:1011
 __sock_create+0x488/0x910 net/socket.c:1550
 sock_create net/socket.c:1601 [inline]
 __sys_socketpair+0x335/0x700 net/socket.c:1732
 __do_sys_socketpair net/socket.c:1781 [inline]
 __se_sys_socketpair net/socket.c:1778 [inline]
 __x64_sys_socketpair+0x97/0xb0 net/socket.c:1778
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd4ee57dff9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd4ee3ff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007fd4ee735f80 RCX: 00007fd4ee57dff9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001
RBP: 00007fd4ee5f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000740 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd4ee735f80 R15: 00007ffe17d01548
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/01 18:18 linux-6.1.y aa4cd140bba5 ea2b66a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in __sock_create
2024/09/17 14:04 linux-6.1.y 5f55cad62cc9 c673ca06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in __sock_create
2024/06/22 04:52 linux-6.1.y eb44d83053d6 edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in __sock_create
* Struck through repros no longer work on HEAD.