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Eric Dumazet 61c2402665 net/sched: fq_pie: prevent dismantle issue 
For some reason, fq_pie_destroy() did not copy
working code from pie_destroy() and other qdiscs,
thus causing elusive bug.

Before calling del_timer_sync(&q->adapt_timer),
we need to ensure timer will not rearm itself.

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu:    0-....: (4416 ticks this GP) idle=60d/1/0x4000000000000000 softirq=10433/10434 fqs=2579
        (t=10501 jiffies g=13085 q=3989)
NMI backtrace for cpu 0
CPU: 0 PID: 13 Comm: ksoftirqd/0 Not tainted 5.16.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3878 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:write_comp_data kernel/kcov.c:221 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x1d/0x80 kernel/kcov.c:273
Code: 54 c8 20 48 89 10 c3 66 0f 1f 44 00 00 53 41 89 fb 41 89 f1 bf 03 00 00 00 65 48 8b 0c 25 40 70 02 00 48 89 ce 4c 8b 54 24 08 <e8> 4e f7 ff ff 84 c0 74 51 48 8b 81 88 15 00 00 44 8b 81 84 15 00
RSP: 0018:ffffc90000d27b28 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888064bf1bf0 RCX: ffff888011928000
RDX: ffff888011928000 RSI: ffff888011928000 RDI: 0000000000000003
RBP: ffff888064bf1c28 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff875d8295 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880783dd300 R14: 0000000000000000 R15: 0000000000000000
 pie_calculate_probability+0x405/0x7c0 net/sched/sch_pie.c:418
 fq_pie_timer+0x170/0x2a0 net/sched/sch_fq_pie.c:383
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 run_ksoftirqd kernel/softirq.c:921 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:913
 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Fixes: ec97ecf1eb ("net: sched: add Flow Queue PIE packet scheduler")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
Cc: Sachin D. Patil <sdp.sachin@gmail.com>
Cc: V. Saicharan <vsaicharan1998@gmail.com>
Cc: Mohit Bhasi <mohitbhasi1998@gmail.com>
Cc: Leslie Monis <lesliemonis@gmail.com>
Cc: Gautam Ramakrishnan <gautamramk@gmail.com>
Link: https://lore.kernel.org/r/20211209084937.3500020-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
 		2021-12-09 08:01:00 -08:00
..
6lowpan
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9p
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802
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8021q net: vlan: fix underflow for the real_dev refcnt 2021-11-26 11:20:46 -08:00
appletalk
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atm
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ax25
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batman-adv Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2021-11-10 16:15:54 -08:00
bluetooth
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bpf
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bpfilter
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bridge
…
caif
…
can
…
ceph
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core net, neigh: clear whole pneigh_entry at alloc time 2021-12-08 17:41:44 -08:00
dcb
…
dccp
…
decnet
…
dns_resolver
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dsa
…
ethernet
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ethtool ethtool: do not perform operations on net devices being unregistered 2021-12-06 16:53:32 -08:00
hsr
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ieee802154
…
ife
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ipv4 udp: using datalen to cap max gso segments 2021-12-09 07:48:07 -08:00
ipv6 seg6: fix the iif in the IPv6 socket control block 2021-12-09 07:55:42 -08:00
iucv
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kcm
…
key
…
l2tp
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l3mdev
…
lapb
…
llc
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mac80211 mac80211: fix throughput LED trigger 2021-11-15 10:56:57 +01:00
mac802154
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mctp mctp: Don't let RTM_DELROUTE delete local routes 2021-12-02 12:15:25 +00:00
mpls net: mpls: Remove rcu protection from nh_dev 2021-11-29 12:39:42 +00:00
mptcp mptcp: use delegate action to schedule 3rd ack retrans 2021-11-20 14:24:00 +00:00
ncsi net/ncsi : Add payload to be 32-bit aligned to fix dropped packets 2021-11-24 11:53:17 +00:00
netfilter netfilter: conntrack: annotate data-races around ct->timeout 2021-12-08 01:29:15 +01:00
netlabel
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netlink net: netlink: af_netlink: Prevent empty skb by adding a check on len. 2021-11-30 17:45:01 -08:00
netrom
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nfc nfc: fix potential NULL pointer deref in nfc_genl_dump_ses_done 2021-12-09 07:50:32 -08:00
nsh
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openvswitch
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packet
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phonet
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psample
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qrtr
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rds net/rds: correct socket tunable error in rds_tcp_tune() 2021-12-02 12:16:57 +00:00
rfkill
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rose
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rxrpc rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() 2021-11-29 15:40:02 +00:00
sched net/sched: fq_pie: prevent dismantle issue 2021-12-09 08:01:00 -08:00
sctp net,lsm,selinux: revert the security_sctp_assoc_established() hook 2021-11-14 12:21:53 +00:00
smc net/smc: Keep smc_close_final rc during active close 2021-12-02 12:14:36 +00:00
strparser
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sunrpc NFS client bugfixes for Linux 5.16 2021-11-27 10:33:55 -08:00
switchdev
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tipc tipc: check for null after calling kmemdup 2021-11-17 20:04:52 -08:00
tls net/tls: Fix authentication failure in CCM mode 2021-11-29 12:48:28 +00:00
unix af_unix: fix regression in read after shutdown 2021-11-20 15:10:30 +00:00
vmw_vsock vsock/virtio: suppress used length validation 2021-11-22 14:49:03 +00:00
wireless nl80211: fix radio statistics in survey dump 2021-11-15 10:51:51 +01:00
x25
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xdp xsk: Fix crash on double free in buffer pool 2021-11-12 15:55:27 +01:00
xfrm
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Kconfig
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Makefile
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compat.c
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devres.c
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socket.c
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sysctl_net.c
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