syzbot

 sign-in | mailing list | source | docs
🐞 Open [1572]
≡ Subsystems
🐞 Fixed [6347]
🐞 Invalid [16189]
⬇ Missing Backports [194]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

INFO: rcu detected stall in sys_lsetxattr (2)

Status: auto-obsoleted due to no activity on 2024/09/04 03:56
Subsystems: fs
[Documentation on labels]
First crash: 393d, last: 393d
▶ ▼ Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: rcu detected stall in sys_lsetxattr 1 2118d 2117d 0/1 auto-closed as invalid on 2020/01/14 07:33
upstream INFO: rcu detected stall in sys_lsetxattr (3) fs 1 298d 298d 0/29 auto-obsoleted due to no activity on 2024/12/08 07:26
upstream INFO: rcu detected stall in sys_lsetxattr fs C done 2 1172d 1171d 22/29 fixed on 2023/02/24 13:51
android-5-15 BUG: soft lockup in sys_lsetxattr 1 333d 333d 0/2 auto-obsoleted due to no activity on 2024/11/02 14:36

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5356
rcu: 	(detected by 0, t=10502 jiffies, g=9617, q=575 ncpus=2)
task:syz-executor.3  state:R  running task     stack:24336 pid:5356  tgid:5355  ppid:5107   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x1796/0x49d0 kernel/sched/core.c:6745
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
 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:kasan_check_range+0xc/0x290 mm/kasan/generic.c:188
Code: 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 49 39 f8 0f 82 56 02
RSP: 0018:ffffc90004e56e50 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81728ad0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fac1aa8
RBP: ffffc90004e56fb0 R08: ffffffff81cc7c49 R09: 1ffffd400032fe6e
R10: dffffc0000000000 R11: fffff9400032fe6f R12: 1ffff920009caddc
R13: ffffffff81cc7997 R14: ffffffff81cc7997 R15: dffffc0000000000
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 cpumask_test_cpu include/linux/cpumask.h:571 [inline]
 cpu_online include/linux/cpumask.h:1181 [inline]
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0xb0/0x9f0 kernel/locking/lockdep.c:5765
 rcu_lock_release include/linux/rcupdate.h:339 [inline]
 rcu_read_unlock include/linux/rcupdate.h:812 [inline]
 filemap_get_entry+0x452/0x4e0 mm/filemap.c:1858
 __filemap_get_folio+0x65/0xbb0 mm/filemap.c:1885
 grow_dev_folio fs/buffer.c:1049 [inline]
 grow_buffers fs/buffer.c:1115 [inline]
 __getblk_slow fs/buffer.c:1141 [inline]
 bdev_getblk+0x201/0x5a0 fs/buffer.c:1443
 __bread_gfp+0x86/0x400 fs/buffer.c:1497
 sb_bread include/linux/buffer_head.h:347 [inline]
 get_branch+0x2c3/0x6e0 fs/sysv/itree.c:102
 get_block+0x180/0x16d0 fs/sysv/itree.c:222
 block_read_full_folio+0x42e/0xe10 fs/buffer.c:2407
 filemap_read_folio+0x1a0/0x790 mm/filemap.c:2355
 do_read_cache_folio+0x134/0x820 mm/filemap.c:3788
 do_read_cache_page+0x30/0x200 mm/filemap.c:3854
 read_mapping_page include/linux/pagemap.h:896 [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_slow+0x28c/0x3f0 fs/namei.c:1692
 lookup_slow+0x53/0x70 fs/namei.c:1709
 walk_component fs/namei.c:2004 [inline]
 link_path_walk+0x9ea/0xea0 fs/namei.c:2331
 path_lookupat+0xa9/0x450 fs/namei.c:2492
 filename_lookup+0x256/0x610 fs/namei.c:2522
 user_path_at_empty+0x42/0x60 fs/namei.c:2929
 user_path_at include/linux/namei.h:58 [inline]
 path_setxattr+0xb2/0x2a0 fs/xattr.c:666
 __do_sys_lsetxattr fs/xattr.c:694 [inline]
 __se_sys_lsetxattr fs/xattr.c:690 [inline]
 __x64_sys_lsetxattr+0xb8/0xd0 fs/xattr.c:690
 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: 0033:0x7f320707cf69
RSP: 002b:00007f3207e330c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007f32071b3f80 RCX: 00007f320707cf69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000100
RBP: 00007f32070da6fe R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f32071b3f80 R15: 00007ffdb0ac3e18
 </TASK>
rcu: rcu_preempt kthread starved for 10537 jiffies! g9617 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:25560 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x1796/0x49d0 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5524 Comm: syz-executor.2 Not tainted 6.10.0-rc2-syzkaller-00064-g71d7b52cc33b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:validate_chain+0x84/0x5900 kernel/locking/lockdep.c:3825
Code: 81 5c b5 8d 48 c7 84 24 10 01 00 00 d0 15 73 81 48 8d 8c 24 00 01 00 00 48 c1 e9 03 48 b8 f1 f1 f1 f1 00 f2 f2 f2 4a 89 04 21 <48> b8 f2 f2 f2 00 f2 f2 f2 00 4a 89 44 21 09 4a 89 44 21 11 48 b8
RSP: 0018:ffffc90009c974e0 EFLAGS: 00000802
RAX: f2f2f200f1f1f1f1 RBX: ffffffff92c6d320 RCX: 1ffff92001392ebc
RDX: 0000000000000001 RSI: ffff8880292ec6e0 RDI: ffff8880292ebc00
RBP: ffffc90009c977e0 R08: ffffffff92f725b7 R09: 1ffffffff25ee4b6
R10: dffffc0000000000 R11: fffffbfff25ee4b7 R12: dffffc0000000000
R13: ffff8880292ebc00 R14: ee5a7e9e6bab005e R15: ffff8880292ebc00
FS:  00007f47f742a6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32326000 CR3: 0000000068a66000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
 __might_fault+0xc6/0x120 mm/memory.c:6233
 __copy_from_user include/linux/uaccess.h:97 [inline]
 check_xstate_in_sigframe arch/x86/kernel/fpu/signal.c:35 [inline]
 __fpu_restore_sig arch/x86/kernel/fpu/signal.c:348 [inline]
 fpu__restore_sig+0x1a1/0x11b0 arch/x86/kernel/fpu/signal.c:493
 restore_sigcontext+0x675/0x7d0 arch/x86/kernel/signal_64.c:95
 __do_sys_rt_sigreturn+0x17f/0x270 arch/x86/kernel/signal_64.c:263
 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: 0033:0x7f47f667cf67
Code: 14 25 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
RSP: 002b:00007f47f742a178 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f47f67b3f88 RCX: 00007f47f667cf69
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f47f67b3f88
RBP: 00007f47f67b3f80 R08: 00007f47f742a6c0 R09: 00007f47f742a6c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f47f67b3f8c
R13: 000000000000000b R14: 00007ffd3427cc60 R15: 00007ffd3427cd48
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/06 03:55 upstream 71d7b52cc33b 121701b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in sys_lsetxattr
* Struck through repros no longer work on HEAD.