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AJvYcCX8NJGVj1JAIv3D929hDFwl+RzTYYgi7FFYHKSxUJ3WO3bq3J4TPYB76ZD2j/1CKfoqBCAKmCFz0A==@kvack.org X-Gm-Message-State: AOJu0Yx7RiAFIgSuBcRY3/JclvVBXVUvTRuak/a6rHhpWMnxLBSqsHsG qOVo7oILJqPVh0Li31ZFpRn5fSChHxyBuEIUXzQrLR2kHRygSgAqF7ToZwh9otvr4FTlC1G6KIi eFUgoSxekusiGgqigEdsmVnC/DckGQ+d3MSwTpl7a+ShMldKZIz7OpNgb274= MIME-Version: 1.0 X-Received: by 2002:a05:6820:4b0f:b0:662:f91f:4a85 with SMTP id 006d021491bc7-679c461d225mr6375070eaf.54.1771923025154; Tue, 24 Feb 2026 00:50:25 -0800 (PST) Date: Tue, 24 Feb 2026 00:50:25 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <699d6651.050a0220.247d23.03d2.GAE@google.com> Subject: [syzbot] [mm?] INFO: rcu detected stall in sys_rename (8) From: syzbot To: jmorris@namei.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, paul@paul-moore.com, penguin-kernel@I-love.SAKURA.ne.jp, serge@hallyn.com, syzkaller-bugs@googlegroups.com, takedakn@nttdata.co.jp 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bt4Uajfe4L2tWnr3lwsyrj8C5N4VnaJwRoWH/VfIQAsAwrCmtys0+VPtjukJaKg4i4tQWKq5aZbWNDq0hLUnethOjgY4V07ZwyUCRd7S7H4y+F/TRLla4+feZLJ0X931AGe+pT4YY5BtFg1h9Iq4a2PaJUi5U3iqv/eeuqinGo6w37IGYgf2Mfjuy/FL4QXKBi2xX0unGQyYqTvOm0l0LdaGC6vRdKcwxdmDtdej1XCDf5THkqGQ3NNCk29giQust8LvUmJBUZmhzBnq1lZMrNU1nj+KfziggOMtjpF7LcXnQAXvvHaUyKPm+bL4x/GqUeAswpCnr2OjDIlZF1hP7zrtmslYe3YZMDPic0kOwixAlkP4O66vabmlnsy567cz/fP5UGEtDSxs9/XNg6DhNXuxQsdkkKQl673LUHqB/XGLheOd7mCUs/bw4NyjpFr8/RwYpaPeWSUFHBXIUifV96na9X8S+I7N X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: 44982d352c33 Add linux-next specific files for 20260219 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10ef3c02580000 kernel config: https://syzkaller.appspot.com/x/.config?x=51f859f3211496bc dashboard link: https://syzkaller.appspot.com/bug?extid=1e663068a97140bb66f3 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1177fe52580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/173e988354ac/disk-44982d35.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/69062373098e/vmlinux-44982d35.xz kernel image: https://storage.googleapis.com/syzbot-assets/3dd3887dc600/bzImage-44982d35.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1e663068a97140bb66f3@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1034/2:b..l P5873/1:b..l rcu: (detected by 1, t=10504 jiffies, g=14085, q=669 ncpus=2) task:udevd state:R running task stack:23784 pid:5873 tgid:5873 ppid:5200 task_flags:0x400140 flags:0x00080800 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x1585/0x5340 kernel/sched/core.c:6907 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_acquire+0x20b/0x2e0 kernel/locking/lockdep.c:5872 Code: e9 30 ff ff ff e8 c5 f3 18 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 41 01 a0 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d fe 3b 95 RSP: 0018:ffffc90003f073d8 EFLAGS: 00000286 RAX: a296ff60d4053400 RBX: 0000000000000246 RCX: 0000000000000046 RDX: 00000000112c4056 RSI: ffffffff8e287ccb RDI: ffffffff8c2a0a00 RBP: 0000000000000000 R08: ffffffff8176da45 R09: ffffffff8e9602e0 R10: ffffc90003f07538 R11: ffffffff81b115b0 R12: 0000000000000002 R13: ffffffff8e9602e0 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5219 [inline] __kmalloc_noprof+0x35c/0x760 mm/slub.c:5231 kmalloc_noprof include/linux/slab.h:966 [inline] tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path2_perm+0x2c5/0x760 security/tomoyo/file.c:927 tomoyo_path_rename+0x14e/0x1b0 security/tomoyo/tomoyo.c:300 security_path_rename+0x248/0x460 security/security.c:1518 filename_renameat2+0x4c1/0x9c0 fs/namei.c:6139 __do_sys_rename fs/namei.c:6188 [inline] __se_sys_rename+0x55/0x2c0 fs/namei.c:6184 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6cd687acc7 RSP: 002b:00007ffec20235f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 000055db72eaa280 RCX: 00007f6cd687acc7 RDX: 000055db72ea2010 RSI: 00007ffec2023610 RDI: 00007ffec2023a10 RBP: 000055db72ebff10 R08: 00000000000001e0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffec2023610 R13: 00007ffec2023a10 R14: 0000000000000000 R15: 000055db6bd089dd task:kworker/u8:7 state:R running task stack:24416 pid:1034 tgid:1034 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x1585/0x5340 kernel/sched/core.c:6907 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7091 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __local_bh_enable_ip+0xe1/0x130 kernel/softirq.c:457 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:924 [inline] __dev_queue_xmit+0x1e6c/0x38a0 net/core/dev.c:4864 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:246 NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xbaa/0x14e0 net/ipv6/ndisc.c:512 ndisc_send_ns+0xd7/0x160 net/ipv6/ndisc.c:670 addrconf_dad_work+0xac4/0x14c0 net/ipv6/addrconf.c:4287 process_one_work+0x949/0x1650 kernel/workqueue.c:3279 process_scheduled_works kernel/workqueue.c:3362 [inline] worker_thread+0xb46/0x1140 kernel/workqueue.c:3443 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: rcu_preempt kthread starved for 10573 jiffies! g14085 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:27616 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5295 [inline] __schedule+0x1585/0x5340 kernel/sched/core.c:6907 __schedule_loop kernel/sched/core.c:6989 [inline] schedule+0x164/0x360 kernel/sched/core.c:7004 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6085 Comm: syz.0.27 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x36/0x90 kernel/kcov.c:314 Code: 28 e9 7b 11 65 8b 0d 49 e9 7b 11 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 54 16 00 00 00 74 52 8b 8a 30 16 00 00 <83> f9 03 75 47 48 8b 8a 38 16 00 00 44 8b 8a 34 16 00 00 49 c1 e1 RSP: 0018:ffffc900025e7a88 EFLAGS: 00000046 RAX: ffffffff81b67144 RBX: ffff8880b8423e40 RCX: 0000000000000000 RDX: ffff88802df49e40 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff81b32095 R09: ffffffff9a518508 R10: 0000000000000003 R11: ffffffff81742750 R12: 00000000100006b5 R13: dffffc0000000000 R14: 00000000000001ed R15: 0000000000000020 FS: 00007f9fec4f96c0(0000) GS:ffff888125002000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000058 CR3: 0000000075658000 CR4: 00000000003526f0 Call Trace: clockevents_program_event+0x1d4/0x350 kernel/time/clockevents.c:336 hrtimer_start_range_ns+0x1687/0x1ff0 kernel/time/hrtimer.c:1331 __posixtimer_deliver_signal kernel/time/posix-timers.c:314 [inline] posixtimer_deliver_signal+0x1ce/0x410 kernel/time/posix-timers.c:340 dequeue_signal+0x249/0x370 kernel/signal.c:660 get_signal+0x55d/0x1330 kernel/signal.c:2914 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9feb59c629 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9fec4f90e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f9feb815fa8 RCX: 00007f9feb59c629 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f9feb815fa8 RBP: 00007f9feb815fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9feb816038 R14: 00007ffda92b66d0 R15: 00007ffda92b67b8 --- This report is generated by a bot. 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