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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" 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