Patch "batman-adv: bypass empty buckets in batadv_purge_orig_ref()" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    batman-adv: bypass empty buckets in batadv_purge_orig_ref()

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     batman-adv-bypass-empty-buckets-in-batadv_purge_orig.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 3e1207a7953f7a588f3270390375ae8680970402
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date:   Sat Mar 30 15:54:38 2024 +0000

    batman-adv: bypass empty buckets in batadv_purge_orig_ref()
    
    [ Upstream commit 40dc8ab605894acae1473e434944924a22cfaaa0 ]
    
    Many syzbot reports are pointing to soft lockups in
    batadv_purge_orig_ref() [1]
    
    Root cause is unknown, but we can avoid spending too much
    time there and perhaps get more interesting reports.
    
    [1]
    
    watchdog: BUG: soft lockup - CPU#0 stuck for 27s! [kworker/u4:6:621]
    Modules linked in:
    irq event stamp: 6182794
     hardirqs last  enabled at (6182793): [<ffff8000801dae10>] __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:386
     hardirqs last disabled at (6182794): [<ffff80008ad66a78>] __el1_irq arch/arm64/kernel/entry-common.c:533 [inline]
     hardirqs last disabled at (6182794): [<ffff80008ad66a78>] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:551
     softirqs last  enabled at (6182792): [<ffff80008aab71c4>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
     softirqs last  enabled at (6182792): [<ffff80008aab71c4>] batadv_purge_orig_ref+0x114c/0x1228 net/batman-adv/originator.c:1287
     softirqs last disabled at (6182790): [<ffff80008aab61dc>] spin_lock_bh include/linux/spinlock.h:356 [inline]
     softirqs last disabled at (6182790): [<ffff80008aab61dc>] batadv_purge_orig_ref+0x164/0x1228 net/batman-adv/originator.c:1271
    CPU: 0 PID: 621 Comm: kworker/u4:6 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
    Workqueue: bat_events batadv_purge_orig
    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 : ffff800099007970
    x29: ffff800099007980 x28: 1fffe00018fce1bd x27: dfff800000000000
    x26: ffff0000d2620008 x25: ffff0000c7e70de8 x24: 0000000000000001
    x23: 1fffe00018e57781 x22: dfff800000000000 x21: ffff80008aab71c4
    x20: ffff0001b40136c0 x19: ffff0000c72bbc08 x18: 1fffe0001a817bb0
    x17: ffff800125414000 x16: ffff80008032116c x15: 0000000000000001
    x14: 1fffe0001ee9d610 x13: 0000000000000000 x12: 0000000000000003
    x11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000000
    x8 : 00000000005e5789 x7 : ffff80008aab61dc x6 : 0000000000000000
    x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
    x2 : 0000000000000006 x1 : 0000000000000080 x0 : ffff800125414000
    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_purge_orig_ref+0x114c/0x1228 net/batman-adv/originator.c:1287
      batadv_purge_orig+0x20/0x70 net/batman-adv/originator.c:1300
      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
    Sending NMI from CPU 0 to CPUs 1:
    NMI backtrace for cpu 1
    CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
    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 : ffff800093a17d30
    x29: ffff800093a17d30 x28: dfff800000000000 x27: 1ffff00012742fb4
    x26: ffff80008ec9d000 x25: 0000000000000000 x24: 0000000000000002
    x23: 1ffff00011d93a74 x22: ffff80008ec9d3a0 x21: 0000000000000000
    x20: ffff0000c19dbc00 x19: ffff8000802d0fd8 x18: 1fffe00036804396
    x17: ffff80008ec9d000 x16: ffff8000802d089c x15: 0000000000000001
    x14: 1fffe00036805f10 x13: 0000000000000000 x12: 0000000000000003
    x11: 0000000000000001 x10: 0000000000000003 x9 : 0000000000000000
    x8 : 00000000000ce8d1 x7 : ffff8000804609e4 x6 : 0000000000000000
    x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff80008ad6aac0
    x2 : 0000000000000000 x1 : ffff80008aedea60 x0 : ffff800125436000
    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
      secondary_start_kernel+0x198/0x1c0 arch/arm64/kernel/smp.c:272
      __secondary_switched+0xb8/0xbc arch/arm64/kernel/head.S:404
    
    Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
    Signed-off-by: Sven Eckelmann <sven@xxxxxxxxxxxxx>
    Signed-off-by: Simon Wunderlich <sw@xxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index aadc653ca1d80..b6367a7576750 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -1238,6 +1238,8 @@ void batadv_purge_orig_ref(struct batadv_priv *bat_priv)
 	/* for all origins... */
 	for (i = 0; i < hash->size; i++) {
 		head = &hash->table[i];
+		if (hlist_empty(head))
+			continue;
 		list_lock = &hash->list_locks[i];
 
 		spin_lock_bh(list_lock);




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