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bh=j48R735f118eJ59p+9MBsl6aHMwkGoc0F1+DYRBFwdk=; b=Kcu8bR/vBvsw/3xvDJ+hiJcsAo1UDYLRnuFHSirS5I4FuU2n9mNJRmXkh33V5yEy8C 7Xdo7z0N6DUpFCB+8W65/WGMNc0QAUopnb6QbHTAzHYbFsXu9pqLLVsE9C+Pjh+yZZQS 05GCHKAMhE+1AQyhxf+yaq+M1wALsu/ya71N2DT7CgjHZaWHFnQm/cxPisWa4zRml7wE Am7MK1ff8r/C1hBvcmK/FLzoqvGufC5HCkcWMIH0CaSx/bOP6Fx3JsYCLbDEiZUCjG40 TO7187XJy41Vgw+XRcWwTgKod0UoBcWp4bUt2gE9Qf9tgF468EM+KAxZ95IMsbpKl1KD a4Tw== X-Forwarded-Encrypted: i=1; AL+hErEgWhJYs3XzH1/edLSj+V1zcOSP5eMuZMccYB447JzGoCp1MgL4cGSzqTGyIh0+YnxvRgJphmIqeg==@kvack.org X-Gm-Message-State: APuU4Z/4UE0HEVVjFH0Ai1xo5eY5AWtLgbtlSFVY8wZ4IUP1mABSb0Ot nzm8juLc6l1wV2j8PEKDsHh5Eai258Ai2w05vkuokIK4mDcByX69T5U8cmXRthsUGd9ACu1d2+N crtNWDoaiWP8QZMH+6e3TN6NzJUr+R2yB0tc8TwzNw+nU8PD+DxEPxO8CinQ= X-Archived-By: MIME-Version: 1.0 X-Received: by 2002:a05:6820:c44b:20b0:71a:f794:49cd with SMTP id 006d021491bc7-71af7944c7amr136480eaf.65.1794781356552; Sun, 15 Nov 2026 14:22:36 -0800 (PST) Date: Sun, 15 Nov 2026 14:22:36 -0800 In-Reply-To: <674b53e8.050a0220.253251.00e0.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6afa30ac.920b2b3a.148c65.0047.GAE@google.com> Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in sys_sendmmsg (7) From: syzbot To: andrii@kernel.org, anna-maria@linutronix.de, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, edumazet@kernel.org, frederic@kernel.org, horms@kernel.org, jmaloy@redhat.com, kadlec@netfilter.org, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pabeni@redhat.com, pablo@netfilter.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, tipc-discussion@lists.sourceforge.net, tung.quang.nguyen@est.tech Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-Rspamd-Server: rspam09 X-Stat-Signature: tr8shwrzjgsxkpzmigmfzj575483tuso X-Rspamd-Queue-Id: 6943920009 X-Rspam-User: X-HE-Tag: 1794781357-361233 X-HE-Meta: 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 HSyLA/XB 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 N1vUSZer ZvqGnmJNRbj+aXkA9QH6YuDW0SWrBNoOspWuLPy53pLC1e7Z3o727vHZYZyjDULOvGgWQ/GzV6Bs7TxSoiTYNnqjL+h7osbfMmzwlhKDsrAd81wKLv6WL6OHn6izNZnajNnDsSMk+EBjvCCskbpGKh7E7ggCepMxEnzKjKRaaWAQbSSQLilRdvV/2c/ChbAcUHIX7oRZY2/yWLtYMfe9kafiPcUG9ECgYbzPOT9B+J84ykxqOs1nS5g8AxDodY+y8sxEYoy2/UG4RueNSDW8z5PK4CkpfsLViu4+UBqKHUt9W6OYkoyftr9BWa3i4aiR Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 syzbot has found a reproducer for the following issue on: HEAD commit: ad3fc05c7e65 arm64: suspend: Only track cpuidle context fo.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=1344e44d580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4e8e6c1701ad8af2 dashboard link: https://syzkaller.appspot.com/bug?extid=53e660acb94e444b9d63 compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16190411580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1730444d580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a30beb3b2b82/disk-ad3fc05c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2eaac3d8da90/vmlinux-ad3fc05c.xz kernel image: https://storage.googleapis.com/syzbot-assets/212a161a069b/Image-ad3fc05c.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+53e660acb94e444b9d63@syzkaller.appspotmail.com watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz.0.42:5008] Modules linked in: irq event stamp: 7423 hardirqs last enabled at (7422): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:511 [inline] hardirqs last enabled at (7422): [] __arm64_exit_to_kernel_mode+0xe4/0x140 arch/arm64/kernel/entry-common.c:99 hardirqs last disabled at (7423): [] __el1_irq arch/arm64/kernel/entry-common.c:566 [inline] hardirqs last disabled at (7423): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:582 softirqs last enabled at (2824): [] spin_unlock_bh include/linux/spinlock.h:407 [inline] softirqs last enabled at (2824): [] release_sock+0x150/0x228 net/core/sock.c:3950 softirqs last disabled at (2830): [] spin_lock_bh include/linux/spinlock.h:353 [inline] softirqs last disabled at (2830): [] lock_sock_nested+0x70/0x110 net/core/sock.c:3927 CPU: 0 UID: 0 PID: 5008 Comm: syz.0.42 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 pstate: 03400005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x138/0xb5c kernel/locking/qspinlock.c:219 lr : queued_spin_lock_slowpath+0x144/0xb5c kernel/locking/qspinlock.c:219 sp : ffff80009b9174e0 x29: ffff80009b917580 x28: ffff0000c8151d90 x27: 1fffe0001944c94b x26: 1fffe0001902a3b2 x25: ffff0000c8151d80 x24: dfff800000000000 x23: ffff700013722ea0 x22: ffff700013722ec0 x21: ffff0000ca264a58 x20: ffff0000ca264a60 x19: ffff0000ca264a50 x18: ffff800123625000 x17: ffff0001ace95387 x16: ffff0000c8151d94 x15: 0000000020007000 x14: 00000000005e6a88 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff60001944c94b x9 : 0000000000000000 x8 : 0000000000000001 x7 : ffff800084c894d0 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008697b308 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000001 Call trace: __cmpwait_case_8 arch/arm64/include/asm/cmpxchg.h:231 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:259 [inline] (P) queued_spin_lock_slowpath+0x138/0xb5c kernel/locking/qspinlock.c:219 (P) queued_spin_lock include/asm-generic/qspinlock.h:115 [inline] do_raw_spin_lock+0x21c/0x2d0 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:183 [inline] _raw_spin_lock_bh+0x50/0x60 kernel/locking/spinlock.c:205 spin_lock_bh include/linux/spinlock.h:353 [inline] lock_sock_nested+0x70/0x110 net/core/sock.c:3927 lock_sock include/net/sock.h:1717 [inline] tipc_sendstream+0x54/0x88 net/tipc/socket.c:1550 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg+0xc8/0x188 net/socket.c:818 ____sys_sendmsg+0x3f8/0x6c8 net/socket.c:2715 ___sys_sendmsg+0x198/0x224 net/socket.c:2769 __sys_sendmmsg+0x204/0x580 net/socket.c:2858 __do_sys_sendmmsg net/socket.c:2885 [inline] __se_sys_sendmmsg net/socket.c:2882 [inline] __arm64_sys_sendmmsg+0xac/0xc8 net/socket.c:2882 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:797 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:816 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5009 Comm: syz.0.42 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : should_resched arch/arm64/include/asm/preempt.h:80 [inline] pc : __local_bh_enable_ip+0x150/0x234 kernel/softirq.c:480 lr : __local_bh_enable_ip+0x14c/0x234 kernel/softirq.c:478 sp : ffff800096516740 x29: ffff800096516740 x28: ffff800096516b80 x27: 000000007a3a32f3 x26: ffff0000dd3d8780 x25: ffff800096516800 x24: ffff700012ca2d00 x23: dfff800000000000 x22: 1fffe000191a6b11 x21: ffff800086493f3c x20: 0000000000000201 x19: ffff0000c8d35888 x18: 00000000ffffffff x17: 0000000000000000 x16: 0000000000000000 x15: ffff800080d84024 x14: 00000000027c6219 x13: 0000000000000001 x12: 0000000000000003 x11: ffff80008b386328 x10: 0000000000000003 x9 : 0000000000000001 x8 : 0000000002d1a4ce x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff8000801546f4 x2 : 0000000000000002 x1 : ffff0000c8d35880 x0 : ffff80012364b000 Call trace: __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P) arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] (P) __local_bh_enable_ip+0x150/0x234 kernel/softirq.c:478 (P) __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:237 [inline] _raw_spin_unlock_bh+0x3c/0x4c kernel/locking/spinlock.c:245 spin_unlock_bh include/linux/spinlock.h:407 [inline] tipc_skb_peek_port net/tipc/msg.h:1235 [inline] tipc_sk_rcv+0x2ec/0x13f0 net/tipc/socket.c:2506 tipc_node_xmit+0x1c8/0xb9c net/tipc/node.c:1708 tipc_node_xmit_skb+0x10c/0x178 net/tipc/node.c:1773 tipc_sk_rcv+0x11c0/0x13f0 net/tipc/socket.c:2537 tipc_node_xmit+0x1c8/0xb9c net/tipc/node.c:1708 tipc_sk_push_backlog+0x3a0/0x788 net/tipc/socket.c:1314 tipc_sk_filter_connect net/tipc/socket.c:2260 [inline] tipc_sk_filter_rcv+0xcb8/0x1fa4 net/tipc/socket.c:2379 tipc_sk_enqueue net/tipc/socket.c:2460 [inline] tipc_sk_rcv+0x5b0/0x13f0 net/tipc/socket.c:2512 tipc_node_xmit+0x1c8/0xb9c net/tipc/node.c:1708 tipc_node_xmit_skb net/tipc/node.c:1773 [inline] tipc_node_distr_xmit+0x264/0x370 net/tipc/node.c:1788 tipc_sk_backlog_rcv+0x17c/0x23c net/tipc/socket.c:2427 sk_backlog_rcv include/net/sock.h:1194 [inline] __release_sock+0x174/0x2c0 net/core/sock.c:3341 release_sock+0x174/0x228 net/core/sock.c:3940 tipc_release+0xca8/0x10d0 net/tipc/socket.c:652 __sock_release+0xa0/0x1d4 net/socket.c:735 sock_close+0x24/0x38 net/socket.c:1529 __fput+0x338/0x74c fs/file_table.c:512 fput_close_sync+0x10c/0x278 fs/file_table.c:618 filp_close_sync+0x7c/0xb4 fs/open.c:1573 __range_close fs/file.c:919 [inline] __do_sys_close_range fs/file.c:1003 [inline] __se_sys_close_range fs/file.c:954 [inline] __arm64_sys_close_range+0x898/0xbdc fs/file.c:954 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x19c/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:797 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:816 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606