syzbot

 sign-in | mailing list | source | docs
🐞 Open [561] 🐞 Fixed [64] 🐞 Invalid [207] ⬇ Missing Backports [38] 📈 Kernel Health 📈 Bug Lifetimes 📈 Fuzzing 📈 Crashes 💬 Send us feedback

INFO: rcu detected stall in sys_exit_group (3)

Status: upstream: reported C repro on 2024/01/23 11:05
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+6f38629d8f83a72bd6f7@syzkaller.appspotmail.com
First crash: 94d, last: 23d
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2024/02/23 upstream (ToT) ffd2cb6b718e C [report] INFO: rcu detected stall in syscall_exit_to_user_mode
▶ ▼ Similar bugs (12)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_exit_group (7) net C unreliable inconclusive 56 2d11h 924d 0/26 upstream: reported C repro on 2021/10/15 18:41
upstream INFO: rcu detected stall in sys_exit_group (6) mm C 4 1304d 1311d 19/26 fixed on 2021/03/10 01:48
linux-5.15 INFO: rcu detected stall in sys_exit_group (2) 3 9d04h 43d 0/3 upstream: reported on 2024/03/14 09:49
linux-6.1 INFO: rcu detected stall in sys_exit_group (2) 1 241d 241d 0/3 auto-obsoleted due to no activity on 2023/12/07 20:57
linux-6.1 INFO: rcu detected stall in sys_exit_group 1 352d 352d 0/3 auto-obsoleted due to no activity on 2023/08/23 09:06
linux-5.15 INFO: rcu detected stall in sys_exit_group 1 303d 303d 0/3 auto-obsoleted due to no activity on 2023/10/06 21:30
upstream INFO: rcu detected stall in sys_exit_group (2) cgroups mm 56 1605d 1607d 0/26 closed as invalid on 2019/12/04 14:14
upstream INFO: rcu detected stall in sys_exit_group (3) kernel 8 1571d 1571d 0/26 closed as invalid on 2020/01/08 05:23
upstream INFO: rcu detected stall in sys_exit_group (4) kernel 13 1570d 1571d 0/26 closed as invalid on 2020/01/09 08:13
upstream INFO: rcu detected stall in sys_exit_group (5) mm 1 1492d 1492d 0/26 auto-closed as invalid on 2020/06/25 07:58
upstream INFO: rcu detected stall in sys_exit_group kernel C done 1 1687d 1682d 13/26 fixed on 2019/10/09 10:54
android-5-15 BUG: soft lockup in sys_exit_group origin:downstream C 6 3d05h 19d 0/2 upstream: reported C repro on 2024/04/07 14:27

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...0: (1 GPs behind) idle=5c54/1/0x4000000000000000 softirq=7971/7972 fqs=5250
	(detected by 0, t=10502 jiffies, g=7201, q=465 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3571 Comm: syz-executor366 Not tainted 6.1.84-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:match_held_lock+0x2/0xb0 kernel/locking/lockdep.c:5107
Code: e9 03 00 75 cf 48 c7 c7 60 ed eb 8a 48 c7 c6 a0 ed eb 8a e8 40 5f c8 f6 0f 0b eb b6 e8 e7 fa ff ff 0f 1f 80 00 00 00 00 55 53 <bd> 01 00 00 00 48 39 77 10 74 67 48 89 fb 81 7f 20 00 00 10 00 72
RSP: 0018:ffffc900001e0b48 EFLAGS: 00000087
RAX: 000000000000000a RBX: 0000000000000002 RCX: ffffc900001e0b03
RDX: ffff88801fca0ad8 RSI: ffff88806fada300 RDI: ffff88801fca0b30
RBP: ffffc900001e0ca0 R08: dffffc0000000000 R09: fffffbfff1ce6d46
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88801fca0b30
R13: 0000000000000002 R14: 000000000000000a R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbbd4ea62f0 CR3: 000000006f9b2000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 find_held_lock kernel/locking/lockdep.c:5152 [inline]
 __lock_release kernel/locking/lockdep.c:5337 [inline]
 lock_release+0x264/0xa20 kernel/locking/lockdep.c:5682
 __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
 _raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 advance_sched+0x68b/0x970 net/sched/sch_taprio.c:749
 __run_hrtimer kernel/time/hrtimer.c:1686 [inline]
 __hrtimer_run_queues+0x5e5/0xe50 kernel/time/hrtimer.c:1750
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x156/0x580 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8c/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:check_kcov_mode kernel/kcov.c:184 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x32/0x60 kernel/kcov.c:207
Code: 44 e8 77 7e 65 8b 15 45 e8 77 7e f7 c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 1c 16 00 00 00 74 2c 8b 91 f8 15 00 00 <83> fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc
RSP: 0018:ffffc90003bff6f8 EFLAGS: 00000246
RAX: ffffffff81cc3291 RBX: 1ffff1100295f2b8 RCX: ffff88801fca0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003bff8f0 R08: ffffffff81cc312b R09: fffff9400038b957
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888014af95c0
R13: 0000000000000000 R14: 00000000200b8000 R15: dffffc0000000000
 zap_pte_range mm/memory.c:1425 [inline]
 zap_pmd_range mm/memory.c:1574 [inline]
 zap_pud_range mm/memory.c:1603 [inline]
 zap_p4d_range mm/memory.c:1624 [inline]
 unmap_page_range+0xc81/0x2740 mm/memory.c:1645
 unmap_vmas+0x48b/0x640 mm/memory.c:1730
 exit_mmap+0x252/0x9f0 mm/mmap.c:3227
 __mmput+0x115/0x3c0 kernel/fork.c:1199
 exit_mm+0x226/0x300 kernel/exit.c:563
 do_exit+0x9f6/0x26a0 kernel/exit.c:856
 do_group_exit+0x202/0x2b0 kernel/exit.c:1019
 __do_sys_exit_group kernel/exit.c:1030 [inline]
 __se_sys_exit_group kernel/exit.c:1028 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1028
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbbd4e22fa9
Code: Unable to access opcode bytes at 0x7fbbd4e22f7f.
RSP: 002b:00007ffc04fd1a68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbbd4e22fa9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 00007fbbd4ea33b0 R08: ffffffffffffffb8 R09: 0000000100000000
R10: 0000000100000000 R11: 0000000000000246 R12: 00007fbbd4ea33b0
R13: 0000000000000000 R14: 00007fbbd4ea5ee0 R15: 00007fbbd4df3470
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.342 msecs
NMI backtrace for cpu 1
CPU: 1 PID: 3571 Comm: syz-executor366 Not tainted 6.1.84-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:timerqueue_del+0x1f/0xf0 lib/timerqueue.c:55
Code: dc fd ff ff 0f 1f 80 00 00 00 00 55 41 57 41 56 41 55 41 54 53 49 89 f5 49 89 fe 48 bd 00 00 00 00 00 fc ff df e8 c1 3b 06 f7 <4d> 89 ec 49 c1 ec 03 41 80 3c 2c 00 74 08 4c 89 ef e8 3b b2 5d f7
RSP: 0018:ffffc900001e0d28 EFLAGS: 00000046
RAX: ffffffff8a844b2f RBX: 0000000000000001 RCX: ffff88801fca0000
RDX: 0000000080010002 RSI: ffff88806fada340 RDI: ffff8880b992a610
RBP: dffffc0000000000 R08: ffffffff8179b2fa R09: fffffbfff1ce6d46
R10: 0000000000000000 R11: dffffc0000000001 R12: 1bc16d674eda5f30
R13: ffff88806fada340 R14: ffff8880b992a610 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbbd4ea62f0 CR3: 000000006f9b2000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __remove_hrtimer kernel/time/hrtimer.c:1117 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1666 [inline]
 __hrtimer_run_queues+0x409/0xe50 kernel/time/hrtimer.c:1750
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x156/0x580 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8c/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:check_kcov_mode kernel/kcov.c:184 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x32/0x60 kernel/kcov.c:207
Code: 44 e8 77 7e 65 8b 15 45 e8 77 7e f7 c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 1c 16 00 00 00 74 2c 8b 91 f8 15 00 00 <83> fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc
RSP: 0018:ffffc90003bff6f8 EFLAGS: 00000246
RAX: ffffffff81cc3291 RBX: 1ffff1100295f2b8 RCX: ffff88801fca0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003bff8f0 R08: ffffffff81cc312b R09: fffff9400038b957
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888014af95c0
R13: 0000000000000000 R14: 00000000200b8000 R15: dffffc0000000000
 zap_pte_range mm/memory.c:1425 [inline]
 zap_pmd_range mm/memory.c:1574 [inline]
 zap_pud_range mm/memory.c:1603 [inline]
 zap_p4d_range mm/memory.c:1624 [inline]
 unmap_page_range+0xc81/0x2740 mm/memory.c:1645
 unmap_vmas+0x48b/0x640 mm/memory.c:1730
 exit_mmap+0x252/0x9f0 mm/mmap.c:3227
 __mmput+0x115/0x3c0 kernel/fork.c:1199
 exit_mm+0x226/0x300 kernel/exit.c:563
 do_exit+0x9f6/0x26a0 kernel/exit.c:856
 do_group_exit+0x202/0x2b0 kernel/exit.c:1019
 __do_sys_exit_group kernel/exit.c:1030 [inline]
 __se_sys_exit_group kernel/exit.c:1028 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1028
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbbd4e22fa9
Code: Unable to access opcode bytes at 0x7fbbd4e22f7f.
RSP: 002b:00007ffc04fd1a68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbbd4e22fa9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 00007fbbd4ea33b0 R08: ffffffffffffffb8 R09: 0000000100000000
R10: 0000000100000000 R11: 0000000000000246 R12: 00007fbbd4ea33b0
R13: 0000000000000000 R14: 00007fbbd4ea5ee0 R15: 00007fbbd4df3470
 </TASK>

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/04 06:30 linux-6.1.y 347385861c50 51c4dcff .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_exit_group
2024/03/28 05:00 linux-6.1.y e5cd595e23c1 120789fd .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_exit_group
2024/02/25 03:23 linux-6.1.y 81e1dc2f7001 8d446f15 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_exit_group
2024/02/23 04:57 linux-6.1.y 8b4118fabd6e 8d446f15 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_exit_group
2024/03/14 22:54 linux-6.1.y 61adba85cc40 d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_exit_group
2024/01/25 22:20 linux-6.1.y 8fd7f4462453 cc4a4020 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_exit_group
2024/01/23 11:04 linux-6.1.y 8fd7f4462453 1c0ecc51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_exit_group
* Struck through repros no longer work on HEAD.