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Date: Sat, 26 Sep 2020 08:57:32 +0200
From: Dmitry Vyukov <dvyukov@...gle.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: kasan-dev <kasan-dev@...glegroups.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: KASAN vs RCU vs RT
On Sat, Sep 26, 2020 at 3:43 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> Hi!
>
> I couldn't find this being reported in a quick search, so let me ask.
>
> With 5.9 I'm seeing a lot (well, once a boot) splats like the one below.
>
> Is there a fix?
Hi Jakub,
FWIW this is the first time I see this BUG. I don't remember it was
mentioned on kasan-dev before.
The commit that added this BUG was added in March 2020, so is not new...
> [ 563.227358] =============================
> [ 563.227722] [ BUG: Invalid wait context ]
> [ 563.228063] 5.9.0-rc6-02036-g7e4a153c60d2-dirty #267 Not tainted
> [ 563.228606] -----------------------------
> [ 563.228950] NetworkManager/758 is trying to lock:
> [ 563.229344] ffffffffa74b5ad8 (depot_lock){-.-.}-{3:3}, at: stack_depot_save+0x1c5/0x3f0
> [ 563.229996] other info that might help us debug this:
> [ 563.230406] context-{5:5}
> [ 563.230641] 7 locks held by NetworkManager/758:
> [ 563.231006] #0: ffff88804d6f00f0 (&f->f_pos_lock){+.+.}-{4:4}, at: __fdget_pos+0x71/0x80
> [ 563.231658] #1: ffff88805692c450 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x2a7/0x350
> [ 563.232290] #2: ffffffffa7763b28 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_sysctl_disable+0x186/0x350
> [ 563.232998] #3: ffff888033e911a0 (&ndev->lock){++.-}-{3:3}, at: ipv6_mc_down+0x1d/0x150
> [ 563.233674] #4: ffff88804f0f24c0 (&mc->mca_lock){+.-.}-{3:3}, at: igmp6_group_dropped+0xfa/0x550
> [ 563.234437] #5: ffff888045688280 (_xmit_ETHER){+...}-{3:3}, at: dev_mc_del+0x1f/0x70
> [ 563.235119] #6: ffff88805ae23890 (krc.lock){..-.}-{2:2}, at: kvfree_call_rcu+0x6c/0x380
> [ 563.235846] stack backtrace:
> [ 563.236146] CPU: 0 PID: 758 Comm: NetworkManager Not tainted 5.9.0-rc6-02036-g7e4a153c60d2-dirty #267
> [ 563.236949] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-2.fc32 04/01/2014
> [ 563.237685] Call Trace:
> [ 563.237948] dump_stack+0xae/0xe8
> [ 563.238279] __lock_acquire.cold+0x1b9/0x34d
> [ 563.238689] ? lock_downgrade+0x3a0/0x3a0
> [ 563.239070] ? stack_access_ok+0x3a/0x90
> [ 563.239510] ? lockdep_hardirqs_on_prepare+0x260/0x260
> [ 563.239997] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 563.240474] lock_acquire+0x14f/0x5e0
> [ 563.240882] ? stack_depot_save+0x1c5/0x3f0
> [ 563.241297] ? lock_release+0x430/0x430
> [ 563.241693] ? arch_stack_walk+0xa2/0xf0
> [ 563.242069] _raw_spin_lock_irqsave+0x48/0x60
> [ 563.242484] ? stack_depot_save+0x1c5/0x3f0
> [ 563.242868] stack_depot_save+0x1c5/0x3f0
> [ 563.243242] kasan_save_stack+0x32/0x40
> [ 563.243609] ? kasan_save_stack+0x1b/0x40
> [ 563.243983] ? __kasan_kmalloc.constprop.0+0xc2/0xd0
> [ 563.244431] ? kmem_cache_alloc+0xee/0x2e0
> [ 563.244810] ? fill_pool+0x211/0x320
> [ 563.245149] ? __debug_object_init+0x7d/0x610
> [ 563.245551] ? debug_object_activate+0x2bb/0x2e0
> [ 563.245968] ? kvfree_call_rcu+0x7b/0x380
> [ 563.246342] ? __hw_addr_del_entry+0x110/0x140
> [ 563.246766] ? dev_mc_del+0x4c/0x70
> [ 563.247122] ? igmp6_group_dropped+0x1ab/0x550
> [ 563.247551] ? ipv6_mc_down+0x37/0x150
> [ 563.247921] ? addrconf_ifdown.isra.0+0x924/0xaa0
> [ 563.248365] ? dev_disable_change+0xb6/0x130
> [ 563.248781] ? addrconf_sysctl_disable+0x227/0x350
> [ 563.249232] ? proc_sys_call_handler.isra.0+0x172/0x310
> [ 563.250571] ? vfs_write+0x159/0x350
> [ 563.250922] ? ksys_write+0xc9/0x160
> [ 563.251283] ? do_syscall_64+0x33/0x40
> [ 563.251648] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 563.252118] ? mark_lock+0x90/0xb20
> [ 563.252472] ? __lock_acquire+0x85c/0x2f50
> [ 563.252861] ? mark_lock+0x90/0xb20
> [ 563.253207] ? lockdep_hardirqs_on_prepare+0x260/0x260
> [ 563.253677] ? __lock_acquire+0x85c/0x2f50
> [ 563.254067] ? mark_lock+0x90/0xb20
> [ 563.254418] ? kasan_unpoison_shadow+0x33/0x40
> [ 563.254833] __kasan_kmalloc.constprop.0+0xc2/0xd0
> [ 563.255278] kmem_cache_alloc+0xee/0x2e0
> [ 563.255659] fill_pool+0x211/0x320
> [ 563.255999] ? __list_del_entry_valid.cold+0x4f/0x4f
> [ 563.256458] ? lockdep_hardirqs_on_prepare+0x260/0x260
> [ 563.256945] ? __lock_acquire+0x85c/0x2f50
> [ 563.257333] __debug_object_init+0x7d/0x610
> [ 563.257742] ? debug_object_destroy+0x150/0x150
> [ 563.258163] debug_object_activate+0x2bb/0x2e0
> [ 563.258580] ? debug_object_assert_init+0x230/0x230
> [ 563.259058] ? rwlock_bug.part.0+0x60/0x60
> [ 563.259478] kvfree_call_rcu+0x7b/0x380
> [ 563.259848] __hw_addr_del_entry+0x110/0x140
> [ 563.260256] dev_mc_del+0x4c/0x70
> [ 563.260596] igmp6_group_dropped+0x1ab/0x550
> [ 563.260998] ? igmp6_send+0xa30/0xa30
> [ 563.261360] ? mark_held_locks+0x65/0x90
> [ 563.261736] ipv6_mc_down+0x37/0x150
> [ 563.262088] addrconf_ifdown.isra.0+0x924/0xaa0
> [ 563.262514] ? lock_acquire+0x14f/0x5e0
> [ 563.262883] ? add_addr+0x1c0/0x1c0
> [ 563.263227] ? lock_release+0x430/0x430
> [ 563.263603] ? create_object.isra.0+0x212/0x530
> [ 563.264022] ? lock_is_held_type+0xbb/0xf0
> [ 563.264415] dev_disable_change+0xb6/0x130
> [ 563.264809] ? addrconf_notify+0x1220/0x1220
> [ 563.265214] ? mutex_trylock+0x169/0x180
> [ 563.265593] ? addrconf_sysctl_disable+0x186/0x350
> [ 563.266057] addrconf_sysctl_disable+0x227/0x350
> [ 563.266526] ? dev_disable_change+0x130/0x130
> [ 563.266965] ? dev_disable_change+0x130/0x130
> [ 563.267508] ? _copy_from_user+0x8e/0xd0
> [ 563.267951] proc_sys_call_handler.isra.0+0x172/0x310
> [ 563.268576] ? proc_sys_lookup+0x2d0/0x2d0
> [ 563.269041] ? avc_policy_seqno+0x28/0x30
> [ 563.269521] ? lock_is_held_type+0xbb/0xf0
> [ 563.269923] vfs_write+0x159/0x350
> [ 563.270261] ksys_write+0xc9/0x160
> [ 563.270609] ? __ia32_sys_read+0x50/0x50
> [ 563.270993] ? ktime_get_coarse_real_ts64+0x103/0x120
> [ 563.271467] ? ktime_get_coarse_real_ts64+0xaa/0x120
> [ 563.271938] do_syscall_64+0x33/0x40
> [ 563.272305] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 563.272789] RIP: 0033:0x7f6dd1c5faf7
> [ 563.273141] Code: c3 66 90 41 54 49 89 d4 55 48 89 f5 53 89 fb 48 83 ec 10 e8 fb fc ff ff 4c 89 e2 48 89 ee 89 df 41 89 c0 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 48 89 44 24 08 e8 34 fd ff ff 48
> [ 563.274705] RSP: 002b:00007fffe513d7b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
> [ 563.275363] RAX: ffffffffffffffda RBX: 0000000000000018 RCX: 00007f6dd1c5faf7
> [ 563.275980] RDX: 0000000000000002 RSI: 00007fffe513d7e0 RDI: 0000000000000018
> [ 563.276593] RBP: 00007fffe513d7e0 R08: 0000000000000000 R09: 00007fffe513d230
> [ 563.277202] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
> [ 563.277814] R13: 0000000000000018 R14: 0000000000000000 R15: 00007fffe513d7e0
>
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