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WARNING: refcount bug in igmp_start_timer

Status: fixed on 2020/04/17 19:57
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+e28037ac1c96d2a86e89@syzkaller.appspotmail.com
Fix commit: 323ebb61e32b net: use listified RX for handling GRO_NORMAL skbs
First crash: 2248d, last: 1882d
Cause bisection: introduced by (bisect log) :
commit fc5e9d63a8db40e9e3a3b180be33d44af8a3cee8
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Wed May 24 14:52:05 2017 +0000

  drm/sti: Drop drm_vblank_cleanup

Crash: WARNING: ODEBUG bug in __do_softirq (log)
Repro: syz .config
  
Fix bisection: fixed by (bisect log) :
commit 323ebb61e32b478e2432c5a3cbf9e2ca678a9609
Author: Edward Cree <ecree@solarflare.com>
Date: Tue Aug 6 13:53:55 2019 +0000

  net: use listified RX for handling GRO_NORMAL skbs

  
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
WARNING: refcount bug in igmp_start_timer 0 (4) 2019/11/09 14:32
Reminder: 99 open syzbot bugs in net subsystem 14 (14) 2019/07/31 15:13
Reminder: 94 open syzbot bugs in net subsystem 1 (1) 2019/06/25 05:48
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-414 WARNING: refcount bug in igmp_start_timer syz 2 2122d 2010d 0/1 public: reported syz repro on 2019/04/13 00:01
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2019/11/09 01:37 12h53m bisect fix upstream OK (1) job log
2019/08/19 06:55 33m bisect fix upstream OK (0) job log log

Sample crash report:
------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 0 PID: 17967 at lib/refcount.c:153 refcount_inc_checked+0x5d/0x70 lib/refcount.c:153
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 17967 Comm: syz-executor5 Not tainted 4.20.0-rc7+ #163
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113
 panic+0x2ad/0x55c kernel/panic.c:188
kobject: 'loop1' (000000007792feef): kobject_uevent_env
 __warn.cold.8+0x20/0x45 kernel/panic.c:540
kobject: 'loop1' (000000007792feef): fill_kobj_path: path = '/devices/virtual/block/loop1'
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
kobject: 'loop1' (000000007792feef): kobject_uevent_env
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:refcount_inc_checked+0x5d/0x70 lib/refcount.c:153
kobject: 'loop1' (000000007792feef): fill_kobj_path: path = '/devices/virtual/block/loop1'
Code: 1d 73 dd 83 06 31 ff 89 de e8 2f b1 ef fd 84 db 75 df e8 56 b0 ef fd 48 c7 c7 20 c0 60 88 c6 05 53 dd 83 06 01 e8 03 63 b9 fd <0f> 0b eb c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89
RSP: 0018:ffff8881c6ae6ce0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81653f85 RDI: 0000000000000005
RBP: ffff8881c6ae6ce8 R08: ffff8881d8980440 R09: ffffed103b5c3ef8
R10: ffffed103b5c3ef8 R11: ffff8881dae1f7c7 R12: 0000000000000000
R13: 0000000100000fc7 R14: ffff8881c1e12800 R15: dffffc0000000000
 igmp_start_timer+0xaf/0xe0 net/ipv4/igmp.c:214
 igmp_mod_timer net/ipv4/igmp.c:252 [inline]
 igmp_heard_query net/ipv4/igmp.c:1038 [inline]
 igmp_rcv+0x1a62/0x3220 net/ipv4/igmp.c:1073
kobject: 'loop1' (000000007792feef): kobject_uevent_env
kobject: 'loop1' (000000007792feef): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop0' (0000000084235d76): kobject_uevent_env
kobject: 'loop0' (0000000084235d76): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop2' (000000008d10b225): kobject_uevent_env
 ip_local_deliver_finish+0x2e9/0xda0 net/ipv4/ip_input.c:215
kobject: 'loop2' (000000008d10b225): fill_kobj_path: path = '/devices/virtual/block/loop2'
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ip_local_deliver+0x1e9/0x750 net/ipv4/ip_input.c:256
kobject: 'loop4' (000000009b3000f6): kobject_uevent_env
 dst_input include/net/dst.h:450 [inline]
 ip_rcv_finish+0x1f9/0x300 net/ipv4/ip_input.c:415
kobject: 'loop4' (000000009b3000f6): fill_kobj_path: path = '/devices/virtual/block/loop4'
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ip_rcv+0xed/0x600 net/ipv4/ip_input.c:524
 __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4946
kobject: 'loop3' (00000000df02957e): kobject_uevent_env
kobject: 'loop3' (00000000df02957e): fill_kobj_path: path = '/devices/virtual/block/loop3'
 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5056
 netif_receive_skb_internal+0x12c/0x620 net/core/dev.c:5159
 napi_frags_finish net/core/dev.c:5699 [inline]
 napi_gro_frags+0x75a/0xc90 net/core/dev.c:5772
 tun_get_user+0x3189/0x4250 drivers/net/tun.c:1952
 tun_chr_write_iter+0xb9/0x160 drivers/net/tun.c:1997
 call_write_iter include/linux/fs.h:1857 [inline]
 do_iter_readv_writev+0x8b0/0xa80 fs/read_write.c:680
 do_iter_write+0x185/0x5f0 fs/read_write.c:959
 vfs_writev+0x1f1/0x360 fs/read_write.c:1004
 do_writev+0x11a/0x310 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457521
Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 b5 fb ff c3 48 83 ec 08 e8 1a 2d 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 63 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f2da89ceba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 000000000000002a RCX: 0000000000457521
RDX: 0000000000000001 RSI: 00007f2da89cebf0 RDI: 00000000000000f0
RBP: 0000000020000640 R08: 00000000000000f0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f2da89cf6d4
R13: 00000000004c53b4 R14: 00000000004d9900 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (19):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/12/22 21:42 upstream 23203e3f34c9 e3bd7ab8 .config console log report syz ci-upstream-kasan-gce-selinux-root
2018/10/21 15:24 upstream 23469de647c4 ecb386fe .config console log report syz ci-upstream-kasan-gce-selinux-root
2018/09/20 20:05 upstream ae596de1a0c8 6cee973c .config console log report syz ci-upstream-kasan-gce-selinux-root
2018/10/22 04:26 linux-next 8c60c36d0b8c ecb386fe .config console log report syz ci-upstream-linux-next-kasan-gce-root
2019/04/14 09:09 upstream 4443f8e6ac77 c402d8f1 .config console log report ci-upstream-kasan-gce-selinux-root
2018/12/24 15:03 upstream 8fe28cb58bcb be79df56 .config console log report ci-upstream-kasan-gce-selinux-root
2018/12/18 08:13 upstream 1a9430db2835 def91db3 .config console log report ci-upstream-kasan-gce-selinux-root
2018/10/31 06:04 upstream 310c7585e830 4ccf7bb4 .config console log report ci-upstream-kasan-gce-root
2018/10/21 14:57 upstream 23469de647c4 ecb386fe .config console log report ci-upstream-kasan-gce-selinux-root
2018/09/29 14:39 upstream e704966c45e4 41e4b329 .config console log report ci-upstream-kasan-gce-selinux-root
2018/09/26 07:05 upstream 846e8dd47c26 b7e11289 .config console log report ci-upstream-kasan-gce-selinux-root
2018/09/20 19:40 upstream ae596de1a0c8 6cee973c .config console log report ci-upstream-kasan-gce-selinux-root
2018/08/18 01:57 upstream edb0a2000936 738da825 .config console log report ci-upstream-kasan-gce
2019/02/16 22:10 upstream 5ded5871030e f42dee6d .config console log report ci-upstream-kasan-gce-386
2019/02/22 14:44 net-old 6321aa197547 6a5fcca4 .config console log report ci-upstream-net-this-kasan-gce
2019/02/15 19:50 net-old f9bcc9f3ee4f f6f233c0 .config console log report ci-upstream-net-this-kasan-gce
2019/01/15 23:43 net-next-old 7939f8beecf1 79cb1a7c .config console log report ci-upstream-net-kasan-gce
2018/11/02 00:38 linux-next 4db9d11bcbef 1f38e9ae .config console log report ci-upstream-linux-next-kasan-gce-root
2018/10/27 20:07 linux-next 8c60c36d0b8c 8efba39a .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.