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Mon, 18 Aug 2025 02:42:28 -0700 (PDT) Date: Mon, 18 Aug 2025 02:42:28 -0700 In-Reply-To: <67555b72.050a0220.2477f.0026.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68a2f584.050a0220.e29e5.009d.GAE@google.com> Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in sys_umount (3) From: syzbot To: andrii@kernel.org, ast@kernel.org, bigeasy@linutronix.de, bpf@vger.kernel.org, brauner@kernel.org, daniel@iogearbox.net, davem@davemloft.net, eddyz87@gmail.com, edumazet@google.com, haoluo@google.com, jack@suse.cz, jiri@resnulli.us, john.fastabend@gmail.com, jolsa@kernel.org, kerneljasonxing@gmail.com, kpsingh@kernel.org, kuba@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, martin.lau@linux.dev, netdev@vger.kernel.org, pabeni@redhat.com, sdf@fomichev.me, song@kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, viro@zeniv.linux.org.uk, yonghong.song@linux.dev Content-Type: text/plain; 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[syz-executor:6662] Modules linked in: irq event stamp: 355416 hardirqs last enabled at (355415): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:86 [inline] hardirqs last enabled at (355415): [] exit_to_kernel_mode+0xc0/0xf0 arch/arm64/kernel/entry-common.c:96 hardirqs last disabled at (355416): [] __el1_irq arch/arm64/kernel/entry-common.c:650 [inline] hardirqs last disabled at (355416): [] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:668 softirqs last enabled at (355404): [] softirq_handle_end kernel/softirq.c:425 [inline] softirqs last enabled at (355404): [] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:607 softirqs last disabled at (355387): [] __do_softirq+0x14/0x20 kernel/softirq.c:613 CPU: 1 UID: 0 PID: 6662 Comm: syz-executor Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : propagation_source fs/pnode.c:77 [inline] pc : change_mnt_propagation+0xec/0x77c fs/pnode.c:114 lr : propagation_source fs/pnode.c:78 [inline] lr : change_mnt_propagation+0x120/0x77c fs/pnode.c:114 sp : ffff8000a4a07a90 x29: ffff8000a4a07ac0 x28: dfff800000000000 x27: ffff0000efa88b60 x26: ffff0000efa88bb0 x25: 1fffe0001df51176 x24: ffff0000efa88b18 x23: ffff0000f331b238 x22: ffff0000efa88a80 x21: ffff0000efa88a80 x20: 0000000000040000 x19: ffff0000f3339500 x18: 1fffe000337a0688 x17: ffff80008f7be000 x16: ffff80008af6de48 x15: 0000000000000002 x14: 1fffe0001df5116f x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001df51171 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000f33395b8 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : 0000000000000000 x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000 Call trace: next_peer fs/pnode.c:19 [inline] (P) propagation_source fs/pnode.c:77 [inline] (P) change_mnt_propagation+0xec/0x77c fs/pnode.c:114 (P) umount_tree+0x7e4/0xbbc fs/namespace.c:1872 do_umount fs/namespace.c:-1 [inline] path_umount+0x90c/0x980 fs/namespace.c:2095 ksys_umount fs/namespace.c:2118 [inline] __do_sys_umount fs/namespace.c:2123 [inline] __se_sys_umount fs/namespace.c:2121 [inline] __arm64_sys_umount+0x128/0x174 fs/namespace.c:2121 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6746 Comm: syz-executor Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : cpu_relax arch/arm64/include/asm/vdso/processor.h:12 [inline] pc : path_init+0xdc0/0xe98 fs/namei.c:2537 lr : path_init+0xdc0/0xe98 fs/namei.c:2537 sp : ffff8000a4247680 x29: ffff8000a42476e0 x28: dfff800000000000 x27: 1fffe00019832884 x26: ffff0000cc194420 x25: 0000000000000101 x24: 1ffff00014848f43 x23: ffff80008f745840 x22: ffff8000a4247a1c x21: 0000000000000100 x20: ffff8000a42479e0 x19: 000000000004a017 x18: 0000000000000000 x17: 0000000000000000 x16: ffff80008b007230 x15: 0000000000000001 x14: 1ffff00011ee8b08 x13: 0000000000000000 x12: 0000000000000000 x11: ffff700011ee8b09 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000da1e0000 x7 : ffff800080daa4c4 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800080da8a84 x2 : 0000000000000000 x1 : 0000000000000004 x0 : 0000000000000001 Call trace: path_init+0xdc0/0xe98 fs/namei.c:2537 (P) path_openat+0x13c/0x2c40 fs/namei.c:4041 do_filp_open+0x18c/0x36c fs/namei.c:4073 do_open_execat+0x124/0x4d8 fs/exec.c:783 alloc_bprm+0x3c/0x548 fs/exec.c:1410 do_execveat_common+0x168/0x834 fs/exec.c:1811 do_execve fs/exec.c:1934 [inline] __do_sys_execve fs/exec.c:2010 [inline] __se_sys_execve fs/exec.c:2005 [inline] __arm64_sys_execve+0x9c/0xb4 fs/exec.c:2005 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.