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Message-ID: <20240408154124.GJ26556@kernel.org> Date: Mon, 8 Apr 2024 16:41:24 +0100 From: Simon Horman <horms@...nel.org> To: Eric Dumazet <edumazet@...gle.com> Cc: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, eric.dumazet@...il.com, Marek Lindner <mareklindner@...mailbox.ch>, Simon Wunderlich <sw@...onwunderlich.de>, Antonio Quartulli <a@...table.cc>, Sven Eckelmann <sven@...fation.org> Subject: Re: [PATCH net-next] batman-adv: bypass empty buckets in batadv_purge_orig_ref() On Sat, Mar 30, 2024 at 03:54:38PM +0000, Eric Dumazet wrote: > 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@...gle.com> > Cc: Marek Lindner <mareklindner@...mailbox.ch> > Cc: Simon Wunderlich <sw@...onwunderlich.de> > Cc: Antonio Quartulli <a@...table.cc> > Cc: Sven Eckelmann <sven@...fation.org> Reviewed-by: Simon Horman <horms@...nel.org>
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