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Mon, 12 Feb 2024 02:26:24 -0800 (PST) Date: Mon, 12 Feb 2024 02:26:24 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ae28ce06112cb52e@google.com> Subject: [syzbot] [batman?] BUG: soft lockup in sys_sendmsg From: syzbot To: a@unstable.cc, b.a.t.m.a.n@lists.open-mesh.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, mareklindner@neomailbox.ch, netdev@vger.kernel.org, pabeni@redhat.com, sven@narfation.org, sw@simonwunderlich.de, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Message-ID-Hash: TMDCWO34Y452BDDGREQHWSRNNWDBSVNZ X-Message-ID-Hash: TMDCWO34Y452BDDGREQHWSRNNWDBSVNZ X-MailFrom: 3UPLJZQkbAJEDJK5v66zCvAA3y.19916zFDzCx98Ez8E.x97@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-b.a.t.m.a.n.lists.open-mesh.org-0; header-match-b.a.t.m.a.n.lists.open-mesh.org-1; header-match-b.a.t.m.a.n.lists.open-mesh.org-2; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: The list for a Better Approach To Mobile Ad-hoc Networking Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: 41bccc98fb79 Linux 6.8-rc2 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=14200118180000 kernel config: https://syzkaller.appspot.com/x/.config?x=451a1e62b11ea4a6 dashboard link: https://syzkaller.appspot.com/bug?extid=a6a4b5bb3da165594cff compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0772069e29cf/disk-41bccc98.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/659d3f0755b7/vmlinux-41bccc98.xz kernel image: https://storage.googleapis.com/syzbot-assets/7780a45c3e51/Image-41bccc98.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a6a4b5bb3da165594cff@syzkaller.appspotmail.com watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.0:28718] Modules linked in: irq event stamp: 45929391 hardirqs last enabled at (45929390): [] __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:386 hardirqs last disabled at (45929391): [] __el1_irq arch/arm64/kernel/entry-common.c:499 [inline] hardirqs last disabled at (45929391): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:517 softirqs last enabled at (2040): [] softirq_handle_end kernel/softirq.c:399 [inline] softirqs last enabled at (2040): [] __do_softirq+0xac8/0xce4 kernel/softirq.c:582 softirqs last disabled at (2052): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (2052): [] batadv_tt_local_resize_to_mtu+0x60/0x154 net/batman-adv/translation-table.c:3949 CPU: 1 PID: 28718 Comm: syz-executor.0 Not tainted 6.8.0-rc2-syzkaller-g41bccc98fb79 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : should_resched arch/arm64/include/asm/preempt.h:79 [inline] pc : __local_bh_enable_ip+0x228/0x44c kernel/softirq.c:388 lr : __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:386 sp : ffff80009a0670b0 x29: ffff80009a0670c0 x28: ffff70001340ce60 x27: ffff80009a0673d0 x26: ffff00011e860290 x25: ffff0000d08a9f08 x24: 0000000000000001 x23: 1fffe00023d4d3c1 x22: dfff800000000000 x21: ffff80008aacbf98 x20: 0000000000000202 x19: ffff00011ea69e08 x18: ffff80009a066800 x17: 77656e2074696620 x16: ffff80008031ffc8 x15: 0000000000000001 x14: 1fffe0001ba5a290 x13: 0000000000000000 x12: 0000000000000003 x11: 0000000000040000 x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000002bcd3ae x7 : ffff80008aacbe30 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000002 x1 : ffff80008aecd7e0 x0 : ffff80012545c000 Call trace: __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:27 [inline] arch_local_irq_enable arch/arm64/include/asm/irqflags.h:49 [inline] __local_bh_enable_ip+0x228/0x44c kernel/softirq.c:386 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline] _raw_spin_unlock_bh+0x3c/0x4c kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:396 [inline] batadv_tt_local_purge+0x264/0x2e8 net/batman-adv/translation-table.c:1356 batadv_tt_local_resize_to_mtu+0xa0/0x154 net/batman-adv/translation-table.c:3956 batadv_update_min_mtu+0x74/0xa4 net/batman-adv/hard-interface.c:651 batadv_netlink_set_mesh+0x50c/0x1078 net/batman-adv/netlink.c:500 genl_family_rcv_msg_doit net/netlink/genetlink.c:1113 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1193 [inline] genl_rcv_msg+0x874/0xb6c net/netlink/genetlink.c:1208 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2543 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1217 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x83c/0xb20 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2674 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.8.0-rc2-syzkaller-g41bccc98fb79 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : arch_local_irq_enable+0x8/0xc arch/arm64/include/asm/irqflags.h:51 lr : default_idle_call+0xf8/0x128 kernel/sched/idle.c:103 sp : ffff80008ebe7cd0 x29: ffff80008ebe7cd0 x28: dfff800000000000 x27: 1ffff00011d7cfa8 x26: ffff80008ec6d000 x25: 0000000000000000 x24: 0000000000000001 x23: 1ffff00011d8da74 x22: ffff80008ec6d3a0 x21: 0000000000000000 x20: ffff80008ec94e00 x19: ffff8000802cff08 x18: 1fffe000367ff796 x17: ffff80008ec6d000 x16: ffff8000802cf7cc x15: 0000000000000001 x14: 1fffe00036801310 x13: 0000000000000000 x12: 0000000000000003 x11: 0000000000000001 x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000000bf0413 x7 : ffff800080461668 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff80008ad5af48 x2 : 0000000000000000 x1 : ffff80008aecd7e0 x0 : ffff80012543a000 Call trace: __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:27 [inline] arch_local_irq_enable+0x8/0xc arch/arm64/include/asm/irqflags.h:49 cpuidle_idle_call kernel/sched/idle.c:170 [inline] do_idle+0x1f0/0x4e8 kernel/sched/idle.c:312 cpu_startup_entry+0x5c/0x74 kernel/sched/idle.c:410 rest_init+0x2dc/0x2f4 init/main.c:730 start_kernel+0x0/0x4e8 init/main.c:827 start_kernel+0x3e8/0x4e8 init/main.c:1072 __primary_switched+0xb4/0xbc arch/arm64/kernel/head.S:523 --- 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