syzbot

 sign-in | mailing list | source | docs
🐞 Open [1295]
≡ Subsystems
🐞 Fixed [5739]
🐞 Invalid [14026]
⬇ Missing Backports [91]
Kernel Health Bugs/Month Bug Lifetimes Fuzzing Crashes
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

INFO: rcu detected stall in sys_creat (5)

Status: auto-obsoleted due to no activity on 2024/08/22 00:53
Subsystems: cgroups mm fs
[Documentation on labels]
First crash: 167d, last: 121d
▶ ▼ Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_creat exfat 98 2102d 2193d 0/28 closed as dup on 2019/01/20 01:52
upstream INFO: rcu detected stall in sys_creat (4) mm cgroups 1 1114d 1114d 0/28 auto-closed as invalid on 2021/12/03 06:38
upstream INFO: rcu detected stall in sys_creat (2) kernel 1 1785d 1785d 0/28 closed as invalid on 2019/12/04 14:04
upstream INFO: rcu detected stall in sys_creat (3) fs 1 1556d 1556d 0/28 auto-closed as invalid on 2020/10/17 06:02
linux-6.1 INFO: rcu detected stall in sys_creat 1 427d 427d 0/3 auto-obsoleted due to no activity on 2023/11/30 18:44
linux-5.15 INFO: rcu detected stall in sys_creat 1 30d 30d 0/3 upstream: reported on 2024/09/22 15:05
android-5-15 BUG: soft lockup in sys_creat 4 148d 179d 0/2 auto-obsoleted due to no activity on 2024/08/25 01:26

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8007/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=59201, q=228 ncpus=2)
task:syz-executor.2  state:R  running task     stack:17904 pid:8007  tgid:8006  ppid:7125   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6916
 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:debug_lockdep_rcu_enabled+0xd/0x40 kernel/rcu/update.c:320
Code: f5 90 0f 0b 90 90 90 eb c6 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d b7 6e 21 04 00 <74> 1e 83 3d 26 a0 21 04 00 74 15 65 48 8b 0c 25 00 d6 03 00 31 c0
RSP: 0018:ffffc90003ea7600 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff888075ef6800 RCX: 0000000080000000
RDX: dffffc0000000000 RSI: ffffffff8bcada20 RDI: ffff8880754e8000
RBP: 1ffff1100eaf248a R08: ffffffff92fe4747 R09: 1ffffffff25fc8e8
R10: dffffc0000000000 R11: fffffbfff25fc8e9 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880754e8000 R15: dffffc0000000000
 task_css include/linux/cgroup.h:433 [inline]
 mem_cgroup_from_task+0x44/0x120 mm/memcontrol.c:1215
 get_mem_cgroup_from_mm+0xd7/0x2a0 mm/memcontrol.c:1268
 __mem_cgroup_charge+0x16/0x80 mm/memcontrol.c:7544
 mem_cgroup_charge include/linux/memcontrol.h:692 [inline]
 filemap_add_folio+0xb3/0x650 mm/filemap.c:965
 do_read_cache_folio+0x10a/0x820 mm/filemap.c:3756
 do_read_cache_page+0x30/0x200 mm/filemap.c:3855
 read_mapping_page include/linux/pagemap.h:900 [inline]
 dir_get_page fs/sysv/dir.c:64 [inline]
 sysv_find_entry+0x1af/0x410 fs/sysv/dir.c:157
 sysv_inode_by_name+0x98/0x1f0 fs/sysv/dir.c:374
 sysv_lookup+0x6b/0xe0 fs/sysv/namei.c:38
 lookup_open fs/namei.c:3494 [inline]
 open_last_lookups fs/namei.c:3585 [inline]
 path_openat+0x11d2/0x35e0 fs/namei.c:3821
 do_filp_open+0x235/0x490 fs/namei.c:3851
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1417
 do_sys_open fs/open.c:1432 [inline]
 __do_sys_creat fs/open.c:1508 [inline]
 __se_sys_creat fs/open.c:1502 [inline]
 __x64_sys_creat+0x123/0x170 fs/open.c:1502
 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: 0033:0x7f325787d0a9
RSP: 002b:00007f32586070c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f32579b3f80 RCX: 00007f325787d0a9
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000020000040
RBP: 00007f32578ec074 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f32579b3f80 R15: 00007fff6ef3c3b8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g59201 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=35240
rcu: rcu_preempt kthread starved for 10500 jiffies! g59201 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26008 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594
 __schedule_loop kernel/sched/core.c:6671 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6686
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2020
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2222
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9802 Comm: syz-executor.4 Not tainted 6.10.0-rc4-next-20240621-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:kasan_check_range+0x5/0x290 mm/kasan/generic.c:188
Code: 8d e8 df ed e3 ff 90 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 55 <41> 57 41 56 41 54 53 b0 01 48 85 f6 0f 84 a0 01 00 00 4c 8d 04 37
RSP: 0018:ffffc90000a18a20 EFLAGS: 00000046
RAX: 000000000000001a RBX: 000000000000069d RCX: ffffffff816f69b8
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff92fe4810
RBP: 0000000000000002 R08: ffffffff92fe4817 R09: 1ffffffff25fc902
R10: dffffc0000000000 R11: fffffbfff25fc903 R12: ffff88801fef0b28
R13: ffff88801fef0ad8 R14: ffff88801fef0ad8 R15: ffff88801fef0000
FS:  00007f1da1f686c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3364b0a000 CR3: 0000000074b34000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 hlock_class kernel/locking/lockdep.c:228 [inline]
 check_wait_context kernel/locking/lockdep.c:4824 [inline]
 __lock_acquire+0x5c8/0x2000 kernel/locking/lockdep.c:5143
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5816
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 advance_sched+0xab/0xca0 net/sched/sch_taprio.c:924
 __run_hrtimer kernel/time/hrtimer.c:1687 [inline]
 __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1751
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1813
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5820
Code: 2b 00 74 08 4c 89 f7 e8 6a 82 8a 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc9000c557520 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff920018aaeb0 RCX: 9f59d4b599963b00
RDX: dffffc0000000000 RSI: ffffffff8bcada20 RDI: ffffffff8c206c80
RBP: ffffc9000c557668 R08: ffffffff92fe4757 R09: 1ffffffff25fc8ea
R10: dffffc0000000000 R11: fffffbfff25fc8eb R12: 1ffff920018aaeac
R13: dffffc0000000000 R14: ffffc9000c557580 R15: 0000000000000246
 __fs_reclaim_acquire mm/page_alloc.c:3868 [inline]
 fs_reclaim_acquire+0x88/0x140 mm/page_alloc.c:3882
 might_alloc include/linux/sched/mm.h:334 [inline]
 slab_pre_alloc_hook mm/slub.c:3926 [inline]
 slab_alloc_node mm/slub.c:4017 [inline]
 __kmalloc_cache_noprof+0x3d/0x2c0 mm/slub.c:4184
 kmalloc_noprof include/linux/slab.h:660 [inline]
 sched_core_alloc_cookie+0x41/0xa0 kernel/sched/core_sched.c:13
 sched_core_share_pid+0x298/0x7d0 kernel/sched/core_sched.c:185
 __do_sys_prctl kernel/sys.c:2729 [inline]
 __se_sys_prctl+0xe27/0x3990 kernel/sys.c:2457
 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: 0033:0x7f1da127d0a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1da1f680c8 EFLAGS: 00000246 ORIG_RAX: 000000000000009d
RAX: ffffffffffffffda RBX: 00007f1da13b3f80 RCX: 00007f1da127d0a9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000003e
RBP: 00007f1da12ec074 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f1da13b3f80 R15: 00007ffc2e49e2e8
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/23 00:47 linux-next f76698bd9a8c edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in sys_creat
2024/05/08 02:11 linux-next 93a39e476608 4cf3f9b3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in sys_creat
* Struck through repros no longer work on HEAD.