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Thu, 19 Sep 2024 07:28:22 -0700 (PDT) Date: Thu, 19 Sep 2024 07:28:22 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <66ec3506.050a0220.29194.002c.GAE@google.com> Subject: [syzbot] [cgroups?] [mm?] INFO: rcu detected stall in shmem_fault (6) From: syzbot To: akpm@linux-foundation.org, cgroups@vger.kernel.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 6FFFF1C0018 X-Stat-Signature: i9mnfpmtj4q9d671nww9zm4gxbxageyr X-Rspam-User: X-HE-Tag: 1726756103-11792 X-HE-Meta: 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 JD8J27By 0c5q0j6DB2mKL80hp0Pmg5aud0SOGGasnDIsAbEAKc82iS5QzF3TkkYLxaIVwmolrzfvG6isBQvGssz+2Pvghhb4L7kVUXZZtaHOSj+AQA+NhH9xLIHo1cmLnCTX/CivlrZmaIxPj/iG0Lx0L0Wsk2ej2vF97pEpnSeUqQjWELTb6WGWcnoWfZHKq29ZbW7cUwXNKVgOaPFJmF7LrQWIX3FrZwoIBNOuOCDOW5v9h1TSwGHPKpAvTf+kIprzHRl1B2qEZQH7Z3bXmJyzcezEIOIro2OTfGEoxWhaAg2A188q7imZFeEOxSvTEwHK+35hkb4MwSj4maXwbo+LF0OIlFDbeZaK78sQIHfNSwKN5jCKaLywiOV7uVmI12Suj904zbFBt6frdzRkob1e+RxjFSZsz6SUaQSxOlBy+kiQ0D+ZUFOZAEJHunDjv8mewsaNuemlhBz2BfwSML0M6M9gd1uEJQsKfMZ4ASZEHE1jR5/LMiMsop8El75k2xBAutAsuL37ZAVz52okbjvtaFkwAVW7Sdw1aW6tWXpq5Mz3KO2zuqtuG34nrzfgyTQB13nrHh7BWtZ4u2vJPy3cHZ1TurFvvMWC3WLa2F2koKE/TD6OKv4uNOCkI8xVohD7CM8AJBVSKfsloSVdA9R6DoRAs2PA4RYcDYK3B+zDgyru7QXWDptsmPV20yKGmqTZaT8RjnvdfcAJ/J+LBZx/E2/ZVgi78y8ATCc7d+X2p4pcig44v2AahWkeio7F97glShmMuXncpN38GEJt/zmw6dE0AsMUfzs2jRwHNJXKFWGH9kbtPNDdPO/mmpFze/dpItPq6iEjXKNOBMR3RaOYzXXC4WO4G96BQzXfBW1cBcD0EQYUFrL8kUGtxIx99ERcEWoVeU/WbE+n/WD1Y4B+/J+j2o6NtFj4AOV7VoZXCouGA/zOnudTTtr7r/As9def0mKyBuL/Ur7U/x8xTgswwCYCLocso+GL+ ngeG41ts KFY5JZD9NE2pHRX5PWL9ZfbEbliC01MYGOciFjHoZVTwO/s9HYpvhPWqhHJxCNkcc+4HVL1viBpjfzAZt89mV1gQCHLMdnVqYG38so8cKJSb/BLOM+jwKII0uelPSacEa9wInA+ckR1a22K+7R+uecjiPpzt7pBFp+07qqO+wRhbQREnpjNyARhd5FvF1FHTK+uqDkCSq/S0Ipdsg6kEBwHWmHC/4gQyn63XdvgkH6K/LoAWIUvIAKWtbKHvf4DBgY9Ompls1WM0gLhkylcZf6ycSoKIl4rA1B8RzbQdAmqUrFwlKbKj7wbvRV0MBQD3Y9JTLH+a7BwE1qW5M7grOrkxZr8ZFE6cGipBBbAvfpKBXNae+5fQFY2CPSCTD0DRmSvvD92rb02V7iC7SRoPpNcFnam3QWjs 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: 0babf683783d Merge tag 'pinctrl-v6.11-4' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=162de407980000 kernel config: https://syzkaller.appspot.com/x/.config?x=1c9e296880039df9 dashboard link: https://syzkaller.appspot.com/bug?extid=4145b11cdf925264bff4 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5d6146edacfa/disk-0babf683.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2593d4fb261a/vmlinux-0babf683.xz kernel image: https://storage.googleapis.com/syzbot-assets/a5e44e1e0eba/bzImage-0babf683.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4145b11cdf925264bff4@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9592/1:b..l rcu: (detected by 1, t=10502 jiffies, g=41797, q=358 ncpus=2) task:syz.1.962 state:R running task stack:24176 pid:9592 tgid:9589 ppid:9183 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 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:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5763 Code: 2b 00 74 08 4c 89 f7 e8 ea e1 87 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:ffffc90003d47020 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff920007a8e10 RCX: baa91729e815a300 RDX: dffffc0000000000 RSI: ffffffff8beae6e0 RDI: ffffffff8c3fbb00 RBP: ffffc90003d47168 R08: ffffffff93fa6847 R09: 1ffffffff27f4d08 R10: dffffc0000000000 R11: fffffbfff27f4d09 R12: 1ffff920007a8e0c R13: dffffc0000000000 R14: ffffc90003d47080 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:326 [inline] rcu_read_lock include/linux/rcupdate.h:838 [inline] filemap_get_entry+0x144/0x3b0 mm/filemap.c:1837 shmem_get_folio_gfp+0x29a/0x2370 mm/shmem.c:2104 shmem_fault+0x252/0x6f0 mm/shmem.c:2388 __do_fault+0x135/0x460 mm/memory.c:4672 do_read_fault mm/memory.c:5078 [inline] do_fault mm/memory.c:5208 [inline] do_pte_missing mm/memory.c:3964 [inline] handle_pte_fault+0x321f/0x6fc0 mm/memory.c:5538 __handle_mm_fault mm/memory.c:5681 [inline] handle_mm_fault+0x1056/0x1ad0 mm/memory.c:5849 faultin_page mm/gup.c:1194 [inline] __get_user_pages+0x6ec/0x16a0 mm/gup.c:1493 populate_vma_page_range+0x264/0x330 mm/gup.c:1932 __mm_populate+0x27a/0x460 mm/gup.c:2035 mm_populate include/linux/mm.h:3430 [inline] vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:593 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: 0033:0x7f848877def9 RSP: 002b:00007f848949c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f8488936058 RCX: 00007f848877def9 RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000 RBP: 00007f84887f0b76 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8488936058 R15: 00007ffd36b2c578 rcu: rcu_preempt kthread starved for 10184 jiffies! g41797 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:26448 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 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+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 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 0 PID: 9590 Comm: syz.4.963 Not tainted 6.11.0-rc7-syzkaller-00149-g0babf683783d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:__bpf_trace_run kernel/trace/bpf_trace.c:2397 [inline] RIP: 0010:bpf_trace_run2+0x159/0x540 kernel/trace/bpf_trace.c:2447 Code: 08 42 80 3c 30 00 74 08 48 89 df e8 81 a7 58 00 48 89 5c 24 38 48 8b 03 bb 01 00 00 00 65 0f c1 18 31 ff 89 de e8 f7 87 f4 ff <85> db 0f 85 b4 02 00 00 49 83 c5 70 4c 89 e8 48 c1 e8 03 42 80 3c RSP: 0018:ffffc9000318fde0 EFLAGS: 00000297 RAX: 0000000000000002 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888026beda00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000318fec8 R08: ffffffff819f08a9 R09: 0000000000000000 R10: ffffc9000318fe40 R11: fffff52000631fca R12: ffffc90003b05000 R13: ffff888033723100 R14: dffffc0000000000 R15: ffffc9000318fe40 FS: 00007fc00c8a16c0(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3f657a CR3: 0000000088454000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_sys_enter+0x93/0xd0 include/trace/events/syscalls.h:18 syscall_trace_enter+0xf8/0x150 kernel/entry/common.c:61 syscall_enter_from_user_mode_work include/linux/entry-common.h:168 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:198 [inline] do_syscall_64+0xcc/0x230 arch/x86/entry/common.c:79 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc00bb19869 Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25 RSP: 002b:00007fc00c8a0b40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f RAX: ffffffffffffffda RBX: 00007fc00bd35f88 RCX: 00007fc00bb19869 RDX: 00007fc00c8a0b40 RSI: 00007fc00c8a0c70 RDI: 0000000000000011 RBP: 00007fc00bd35f80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc00bd35f8c R13: 0000000000000000 R14: 00007ffc51e12cf0 R15: 00007ffc51e12dd8 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup