B.A.T.M.A.N July 2024

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[syzbot] [batman?] INFO: rcu detected stall in batadv_iv_send_outstanding_bat_ogm_packet (5)
by syzbot 04 Jul '24

04 Jul '24

Hello, syzbot found the following issue on: HEAD commit: 707081b61156 Merge branch 'for-next/core', remote-tracking.. 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=1182b083180000 kernel config: https://syzkaller.appspot.com/x/.config?x=caeac3f3565b057a dashboard link: https://syzkaller.appspot.com/bug?extid=7beee86dd68b7ee38e4a 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/6cad68bf7532/disk-707081b6.raw… vmlinux: https://storage.googleapis.com/syzbot-assets/1a27e5400778/vmlinux-707081b6.… kernel image: https://storage.googleapis.com/syzbot-assets/67dfc53755d0/Image-707081b6.gz… IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7beee86dd68b7ee38e4a(a)syzkaller.appspotmail.com watchdog: BUG: soft lockup - CPU#0 stuck for 27s! [kworker/u4:5:575] Modules linked in: irq event stamp: 132863 hardirqs last enabled at (132862): [<ffff80008ad68de8>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:85 [inline] hardirqs last enabled at (132862): [<ffff80008ad68de8>] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:95 hardirqs last disabled at (132863): [<ffff80008ad66a78>] __el1_irq arch/arm64/kernel/entry-common.c:533 [inline] hardirqs last disabled at (132863): [<ffff80008ad66a78>] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:551 softirqs last enabled at (128034): [<ffff80008002189c>] softirq_handle_end kernel/softirq.c:399 [inline] softirqs last enabled at (128034): [<ffff80008002189c>] __do_softirq+0xac8/0xce4 kernel/softirq.c:582 softirqs last disabled at (128036): [<ffff80008aad75f4>] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (128036): [<ffff80008aad75f4>] batadv_tt_local_commit_changes+0x24/0x44 net/batman-adv/translation-table.c:3717 CPU: 0 PID: 575 Comm: kworker/u4:5 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x15c/0xcf8 kernel/locking/qspinlock.c:383 lr : queued_spin_lock_slowpath+0x168/0xcf8 kernel/locking/qspinlock.c:383 sp : ffff800098c77720 x29: ffff800098c777c0 x28: 1fffe0001b8a126a x27: 1ffff0001318eef0 x26: dfff800000000000 x25: 1fffe0001b8a126c x24: ffff800098c77740 x23: ffff800098c77780 x22: ffff70001318eee8 x21: 0000000000000001 x20: 0000000000000001 x19: ffff0000dc509350 x18: ffff0001b4015840 x17: ffff800125414000 x16: ffff8000809fd934 x15: 0000000000000001 x14: 1fffe0001b8a126a x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001b8a126b x10: 1fffe0001b8a126a x9 : 0000000000000000 x8 : 0000000000000001 x7 : ffff80008aad75f4 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008ae5db50 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000001 Call trace: __cmpwait_case_8 arch/arm64/include/asm/cmpxchg.h:229 [inline] __cmpwait arch/arm64/include/asm/cmpxchg.h:257 [inline] queued_spin_lock_slowpath+0x15c/0xcf8 kernel/locking/qspinlock.c:383 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x320/0x348 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline] _raw_spin_lock_bh+0x50/0x60 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] batadv_tt_local_commit_changes+0x24/0x44 net/batman-adv/translation-table.c:3717 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:811 [inline] batadv_iv_ogm_schedule+0x1ec/0xdf0 net/batman-adv/bat_iv_ogm.c:868 batadv_iv_send_outstanding_bat_ogm_packet+0x740/0x900 net/batman-adv/bat_iv_ogm.c:1712 process_one_work+0x694/0x1204 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2787 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 --- 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(a)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

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B.A.T.M.A.N July 2024