syzbot


INFO: rcu detected stall in schedule

Status: auto-obsoleted due to no activity on 2024/09/27 22:30
Reported-by: syzbot+3c8de62604f790092d97@syzkaller.appspotmail.com
First crash: 177d, last: 166d
Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in schedule (5) kernel 1 1276d 1276d 0/28 auto-closed as invalid on 2021/09/03 22:50
upstream INFO: rcu detected stall in schedule (4) cgroups mm 2 1790d 1790d 0/28 closed as invalid on 2020/01/09 08:13
upstream INFO: rcu detected stall in schedule (3) mm cgroups 4 1790d 1790d 0/28 closed as invalid on 2020/01/08 05:23
upstream INFO: rcu detected stall in schedule (2) kernel 10 1826d 1826d 0/28 closed as invalid on 2019/12/04 14:04
upstream INFO: rcu detected stall in schedule (7) usb C done 47 4d08h 189d 0/28 upstream: reported C repro on 2024/05/27 15:00
upstream INFO: rcu detected stall in schedule kernel 1 2169d 2165d 0/28 auto-closed as invalid on 2019/06/23 09:16
upstream INFO: rcu detected stall in schedule (6) kernel syz done 1 477d 473d 0/28 auto-obsoleted due to no activity on 2023/11/21 16:15

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10545 ticks this GP) idle=c174/1/0x4000000000000000 softirq=33266/33268 fqs=5250
	(t=10501 jiffies g=46513 q=683 ncpus=2)
CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.1.94-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:finish_task_switch+0x1d3/0x810 kernel/sched/core.c:5124
Code: 2e 0b 00 48 83 c4 08 4c 89 f7 e8 98 30 00 00 e9 8f 04 00 00 4c 89 f7 e8 7b 23 36 09 e8 06 1e 32 00 fb 49 8d bc 24 f8 15 00 00 <48> 89 f8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df 42 0f b6 04 28
RSP: 0018:ffffc90000147aa8 EFLAGS: 00000286
RAX: 7ec3797706be8e00 RBX: ffff8880b983b748 RCX: ffffffff91c95103
RDX: dffffc0000000000 RSI: ffffffff8aec0240 RDI: ffff88813feed178
RBP: ffffc90000147af0 R08: dffffc0000000000 R09: ffffed1017307541
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88813feebb80
R13: 1ffff110173076eb R14: ffff8880b983aa00 R15: ffff8880b983b758
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f558efb3f88 CR3: 0000000073afe000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 context_switch kernel/sched/core.c:5248 [inline]
 __schedule+0x1435/0x4550 kernel/sched/core.c:6558
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:preempt_count_add+0x12/0x180 kernel/sched/core.c:5703
Code: e8 d3 b2 83 00 eb 8c e9 f2 fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 90 41 57 41 56 53 89 fb 48 c7 c0 60 51 c9 91 48 c1 e8 03 <49> bf 00 00 00 00 00 fc ff df 42 0f b6 04 38 84 c0 0f 85 e2 00 00
RSP: 0018:ffffc90000147e30 EFLAGS: 00000a02
RAX: 1ffffffff2392a2c RBX: 0000000000000001 RCX: ffffffff8a939aa6
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
RBP: ffff88813feed2e8 R08: dffffc0000000000 R09: ffffed1027fdd771
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88813feebb80
R13: ffffffff8cfcf380 R14: ffff88813feecdf8 R15: dffffc0000000000
 schedule+0xb8/0x180 kernel/sched/core.c:6633
 smpboot_thread_fn+0x604/0xa30 kernel/smpboot.c:160
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/19 22:30 linux-6.1.y eb44d83053d6 41b7e219 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in schedule
2024/06/13 23:08 linux-6.1.y ae9f2a70d69e a9616ff5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in schedule
2024/06/10 23:38 linux-6.1.y 88690811da69 048c640a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in schedule
2024/06/08 09:43 linux-6.1.y 88690811da69 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in schedule
* Struck through repros no longer work on HEAD.