syzbot

 sign-in | mailing list | source | docs
🐞 Open [1572]
≡ Subsystems
🐞 Fixed [5936]
🐞 Invalid [14433]
⬇ Missing Backports [102]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

INFO: rcu detected stall in sys_mbind (4)

Status: auto-obsoleted due to no activity on 2024/11/22 04:15
Subsystems: mm
[Documentation on labels]
First crash: 119d, last: 119d
▶ ▼ Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_mbind mm 4 2067d 2097d 0/28 auto-closed as invalid on 2019/10/22 22:44
upstream INFO: rcu detected stall in sys_mbind (2) mm 1 1593d 1593d 0/28 auto-closed as invalid on 2020/11/09 09:33
upstream INFO: rcu detected stall in sys_mbind (3) cgroups mm 1 191d 191d 0/28 auto-obsoleted due to no activity on 2024/08/12 04:57
linux-4.19 BUG: soft lockup in sys_mbind syz error 1 1326d 1326d 0/1 upstream: reported syz repro on 2021/05/05 05:15

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6297/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=25249, q=666 ncpus=2)
task:syz.0.134       state:R  running task     stack:24784 pid:6297  tgid:6296  ppid:5556   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_get_return_address+0x39/0xc0 arch/x86/kernel/unwind_orc.c:366
Code: 00 00 00 00 00 fc ff df e8 94 65 52 00 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 72 8b 2b 31 ff 89 ee e8 b9 69 52 00 85 ed <74> 4a 48 83 c3 48 49 89 df 49 c1 ef 03 43 80 3c 37 00 74 08 48 89
RSP: 0018:ffffc90009507218 EFLAGS: 00000202
RAX: 0000000000000002 RBX: ffffc90009507240 RCX: 0000000000040000
RDX: ffff888022cabc00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff814125c7 R09: ffffffff814140bf
R10: 0000000000000003 R11: ffff888022cabc00 R12: ffff888022cabc00
R13: ffffffff817f3110 R14: dffffc0000000000 R15: ffffc90009507240
 arch_stack_walk+0x125/0x1b0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 save_stack+0xfb/0x1f0 mm/page_owner.c:156
 __reset_page_owner+0x76/0x430 mm/page_owner.c:297
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1094 [inline]
 free_unref_page+0xd22/0xea0 mm/page_alloc.c:2612
 __folio_put+0x2c8/0x440 mm/swap.c:128
 migrate_folio_move mm/migrate.c:1330 [inline]
 migrate_pages_batch+0x2a76/0x3560 mm/migrate.c:1818
 migrate_pages_sync mm/migrate.c:1884 [inline]
 migrate_pages+0x1f59/0x3460 mm/migrate.c:1993
 do_mbind mm/mempolicy.c:1388 [inline]
 kernel_mbind mm/mempolicy.c:1531 [inline]
 __do_sys_mbind mm/mempolicy.c:1605 [inline]
 __se_sys_mbind+0x1490/0x19f0 mm/mempolicy.c:1601
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f89f5379e79
RSP: 002b:00007f89f6142038 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed
RAX: ffffffffffffffda RBX: 00007f89f5515f80 RCX: 00007f89f5379e79
RDX: 0000000000000000 RSI: 0000000000800000 RDI: 0000000020001000
RBP: 00007f89f53e793e R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f89f5515f80 R15: 00007fff9f2fb948
 </TASK>
rcu: rcu_preempt kthread starved for 10247 jiffies! g25249 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:26296 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc4-syzkaller-00143-g3d5f968a177d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:92 [inline]
RIP: 0010:acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:112
Code: 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 00 d7 03 00 48 f7 00 08 00 00 00 75 10 eb 07 0f 00 2d 85 1f b3 00 f3 0f 1e fa fb f4 <fa> e9 c4 3f 39 00 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffffff8e607ca8 EFLAGS: 00000246
RAX: ffffffff8e694680 RBX: ffff888018afc864 RCX: 0000000000b3deb9
RDX: 0000000000000001 RSI: ffff888018afc800 RDI: ffff888018afc864
RBP: 000000000003a678 R08: ffff8880b9237c7b R09: 1ffff11017246f8f
R10: dffffc0000000000 R11: ffffffff8bb6fcf0 R12: ffff88801af2e800
R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8f0dece0
FS:  0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000202c0030 CR3: 000000007c3e2000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:702
 cpuidle_enter_state+0x114/0x480 drivers/cpuidle/cpuidle.c:267
 cpuidle_enter+0x5d/0xa0 drivers/cpuidle/cpuidle.c:388
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:230 [inline]
 do_idle+0x375/0x5d0 kernel/sched/idle.c:326
 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:424
 rest_init+0x2dc/0x300 init/main.c:747
 start_kernel+0x47a/0x500 init/main.c:1103
 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488
 common_startup_64+0x13e/0x147
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/08/24 04:05 upstream 3d5f968a177d d7d32352 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in sys_mbind
* Struck through repros no longer work on HEAD.