* WARNING: refcount bug in qrtr_node_lookup
@ 2020-09-07 21:18 syzbot
2021-08-28 18:32 ` [syzbot] " syzbot
0 siblings, 1 reply; 9+ messages in thread
From: syzbot @ 2020-09-07 21:18 UTC (permalink / raw)
To: bjorn.andersson, davem, kuba, linux-kernel,
manivannan.sadhasivam, netdev, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 9322c47b Merge tag 'xfs-5.9-fixes-2' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16cf729e900000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1c560d0f4e121c9
dashboard link: https://syzkaller.appspot.com/bug?extid=c613e88b3093ebf3686e
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=170c51a5900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=151a4245900000
The issue was bisected to:
commit e42671084361302141a09284fde9bbc14fdd16bf
Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Date: Thu May 7 12:53:06 2020 +0000
net: qrtr: Do not depend on ARCH_QCOM
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10fd1a9e900000
final oops: https://syzkaller.appspot.com/x/report.txt?x=12fd1a9e900000
console output: https://syzkaller.appspot.com/x/log.txt?x=14fd1a9e900000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c613e88b3093ebf3686e@syzkaller.appspotmail.com
Fixes: e42671084361 ("net: qrtr: Do not depend on ARCH_QCOM")
------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 21 at lib/refcount.c:25 refcount_warn_saturate+0x13d/0x1a0 lib/refcount.c:25
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: qrtr_ns_handler qrtr_ns_worker
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1d6/0x29e lib/dump_stack.c:118
panic+0x2c0/0x800 kernel/panic.c:231
__warn+0x227/0x250 kernel/panic.c:600
report_bug+0x1b1/0x2e0 lib/bug.c:198
handle_bug+0x42/0x80 arch/x86/kernel/traps.c:234
exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:254
asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:refcount_warn_saturate+0x13d/0x1a0 lib/refcount.c:25
Code: c7 83 96 15 89 31 c0 e8 b1 34 a6 fd 0f 0b eb a3 e8 a8 94 d4 fd c6 05 04 8e ea 05 01 48 c7 c7 ba 96 15 89 31 c0 e8 93 34 a6 fd <0f> 0b eb 85 e8 8a 94 d4 fd c6 05 e7 8d ea 05 01 48 c7 c7 e6 96 15
RSP: 0018:ffffc90000dd79c0 EFLAGS: 00010046
RAX: eb7b51afe96d3100 RBX: 0000000000000002 RCX: ffff8880a9bf6580
RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffffff815e27d0 R09: ffffed1015d241c3
R10: ffffed1015d241c3 R11: 0000000000000000 R12: ffff8880a761a898
R13: 1ffff1101517fa56 R14: 0000000000000286 R15: ffff8880a761a800
refcount_add include/linux/refcount.h:206 [inline]
refcount_inc include/linux/refcount.h:241 [inline]
kref_get include/linux/kref.h:45 [inline]
qrtr_node_acquire net/qrtr/qrtr.c:196 [inline]
qrtr_node_lookup+0xc0/0xd0 net/qrtr/qrtr.c:388
qrtr_send_resume_tx net/qrtr/qrtr.c:980 [inline]
qrtr_recvmsg+0x429/0xa80 net/qrtr/qrtr.c:1043
qrtr_ns_worker+0x176/0x45f0 net/qrtr/ns.c:624
process_one_work+0x789/0xfc0 kernel/workqueue.c:2269
worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415
kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [syzbot] WARNING: refcount bug in qrtr_node_lookup
2020-09-07 21:18 WARNING: refcount bug in qrtr_node_lookup syzbot
@ 2021-08-28 18:32 ` syzbot
2021-08-30 8:39 ` Dmitry Vyukov
0 siblings, 1 reply; 9+ messages in thread
From: syzbot @ 2021-08-28 18:32 UTC (permalink / raw)
To: anant.thazhemadam, bjorn.andersson, butterflyhuangxx, davem,
dragonjetli, hdanton, kuba, linux-arm-msm, linux-kernel-mentees,
linux-kernel, mani, manivannan.sadhasivam, masahiroy, netdev,
syzkaller-bugs
syzbot suspects this issue was fixed by commit:
commit 7e78c597c3ebfd0cb329aa09a838734147e4f117
Author: Xiaolong Huang <butterflyhuangxx@gmail.com>
Date: Thu Aug 19 19:50:34 2021 +0000
net: qrtr: fix another OOB Read in qrtr_endpoint_post
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11279a4d300000
start commit: ba4f184e126b Linux 5.9-rc6
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=af502ec9a451c9fc
dashboard link: https://syzkaller.appspot.com/bug?extid=c613e88b3093ebf3686e
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12263dd9900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13d77603900000
If the result looks correct, please mark the issue as fixed by replying with:
#syz fix: net: qrtr: fix another OOB Read in qrtr_endpoint_post
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [syzbot] WARNING: refcount bug in qrtr_node_lookup
2021-08-28 18:32 ` [syzbot] " syzbot
@ 2021-08-30 8:39 ` Dmitry Vyukov
0 siblings, 0 replies; 9+ messages in thread
From: Dmitry Vyukov @ 2021-08-30 8:39 UTC (permalink / raw)
To: syzbot
Cc: anant.thazhemadam, bjorn.andersson, butterflyhuangxx, davem,
dragonjetli, hdanton, kuba, linux-arm-msm, linux-kernel-mentees,
linux-kernel, mani, manivannan.sadhasivam, masahiroy, netdev,
syzkaller-bugs
On Sat, 28 Aug 2021 at 20:32, syzbot
<syzbot+c613e88b3093ebf3686e@syzkaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 7e78c597c3ebfd0cb329aa09a838734147e4f117
> Author: Xiaolong Huang <butterflyhuangxx@gmail.com>
> Date: Thu Aug 19 19:50:34 2021 +0000
>
> net: qrtr: fix another OOB Read in qrtr_endpoint_post
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11279a4d300000
> start commit: ba4f184e126b Linux 5.9-rc6
> git tree: upstream
> kernel config: https://syzkaller.appspot.com/x/.config?x=af502ec9a451c9fc
> dashboard link: https://syzkaller.appspot.com/bug?extid=c613e88b3093ebf3686e
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12263dd9900000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13d77603900000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: net: qrtr: fix another OOB Read in qrtr_endpoint_post
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
Hi Hillf,
You posted some patch related to refcounts. Do you think "net: qrtr:
fix another OOB Read in qrtr_endpoint_post" is a plausible fix? Or is
there still something wrong with refcounts?
^ permalink raw reply [flat|nested] 9+ messages in thread
[parent not found: <20210901030636.2336-1-hdanton@sina.com>]
* Re: [syzbot] WARNING: refcount bug in qrtr_node_lookup
[not found] <20210901030636.2336-1-hdanton@sina.com>
@ 2021-09-01 3:41 ` syzbot
2021-09-01 4:26 ` Eric Dumazet
0 siblings, 1 reply; 9+ messages in thread
From: syzbot @ 2021-09-01 3:41 UTC (permalink / raw)
To: bjorn.andersson, dan.carpenter, hdanton, linux-kernel,
manivannan.sadhasivam, netdev, syzkaller-bugs
Hello,
syzbot tried to test the proposed patch but the build/boot failed:
arch/x86/kernel/setup.c:916:6: error: implicit declaration of function 'acpi_mps_check' [-Werror,-Wimplicit-function-declaration]
arch/x86/kernel/setup.c:1110:2: error: implicit declaration of function 'acpi_table_upgrade' [-Werror,-Wimplicit-function-declaration]
arch/x86/kernel/setup.c:1112:2: error: implicit declaration of function 'acpi_boot_table_init' [-Werror,-Wimplicit-function-declaration]
arch/x86/kernel/setup.c:1120:2: error: implicit declaration of function 'early_acpi_boot_init' [-Werror,-Wimplicit-function-declaration]
arch/x86/kernel/setup.c:1162:2: error: implicit declaration of function 'acpi_boot_init' [-Werror,-Wimplicit-function-declaration]
Tested on:
commit: 9e9fb765 Merge tag 'net-next-5.15' of git://git.kernel..
git tree: upstream
dashboard link: https://syzkaller.appspot.com/bug?extid=c613e88b3093ebf3686e
compiler:
patch: https://syzkaller.appspot.com/x/patch.diff?x=1413e2f5300000
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [syzbot] WARNING: refcount bug in qrtr_node_lookup
2021-09-01 3:41 ` syzbot
@ 2021-09-01 4:26 ` Eric Dumazet
0 siblings, 0 replies; 9+ messages in thread
From: Eric Dumazet @ 2021-09-01 4:26 UTC (permalink / raw)
To: syzbot, bjorn.andersson, dan.carpenter, hdanton, linux-kernel,
manivannan.sadhasivam, netdev, syzkaller-bugs
On 8/31/21 8:41 PM, syzbot wrote:
> Hello,
>
> syzbot tried to test the proposed patch but the build/boot failed:
>
> arch/x86/kernel/setup.c:916:6: error: implicit declaration of function 'acpi_mps_check' [-Werror,-Wimplicit-function-declaration]
> arch/x86/kernel/setup.c:1110:2: error: implicit declaration of function 'acpi_table_upgrade' [-Werror,-Wimplicit-function-declaration]
> arch/x86/kernel/setup.c:1112:2: error: implicit declaration of function 'acpi_boot_table_init' [-Werror,-Wimplicit-function-declaration]
> arch/x86/kernel/setup.c:1120:2: error: implicit declaration of function 'early_acpi_boot_init' [-Werror,-Wimplicit-function-declaration]
> arch/x86/kernel/setup.c:1162:2: error: implicit declaration of function 'acpi_boot_init' [-Werror,-Wimplicit-function-declaration]
>
>
> Tested on:
>
> commit: 9e9fb765 Merge tag 'net-next-5.15' of git://git.kernel..
> git tree: upstream
> dashboard link: https://syzkaller.appspot.com/bug?extid=c613e88b3093ebf3686e
> compiler:
> patch: https://syzkaller.appspot.com/x/patch.diff?x=1413e2f5300000
>
Tree seems broken, no idea why the following is needed.
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 63b20536c8d236083336c2b50dc5f54225a80eab..6edec9a28293ea3241bd7842ab5555a1691e6cea 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -22,6 +22,7 @@
#include <linux/usb/xhci-dbgp.h>
#include <linux/static_call.h>
#include <linux/swiotlb.h>
+#include <linux/acpi.h>
#include <uapi/linux/mount.h>
^ permalink raw reply related [flat|nested] 9+ messages in thread
[parent not found: <20210902005238.2413-1-hdanton@sina.com>]
* Re: [syzbot] WARNING: refcount bug in qrtr_node_lookup
[not found] <20210902005238.2413-1-hdanton@sina.com>
@ 2021-09-02 2:32 ` syzbot
[not found] ` <20210902041238.2559-1-hdanton@sina.com>
0 siblings, 1 reply; 9+ messages in thread
From: syzbot @ 2021-09-02 2:32 UTC (permalink / raw)
To: bjorn.andersson, dan.carpenter, eric.dumazet, hdanton,
linux-kernel, manivannan.sadhasivam, netdev, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
UBSAN: object-size-mismatch in send4
================================================================================
UBSAN: object-size-mismatch in ./include/net/flow.h:197:33
member access within address 000000001597b753 with insufficient space
for an object of type 'struct flowi'
CPU: 1 PID: 231 Comm: kworker/u4:4 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x15e/0x1d3 lib/dump_stack.c:105
ubsan_epilogue lib/ubsan.c:148 [inline]
handle_object_size_mismatch lib/ubsan.c:229 [inline]
ubsan_type_mismatch_common+0x1de/0x390 lib/ubsan.c:242
__ubsan_handle_type_mismatch_v1+0x41/0x50 lib/ubsan.c:271
flowi4_to_flowi_common include/net/flow.h:197 [inline]
send4+0x39b/0xdd0 drivers/net/wireguard/socket.c:52
wg_socket_send_skb_to_peer+0xc7/0x200 drivers/net/wireguard/socket.c:174
wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
wg_packet_handshake_send_worker+0x14a/0x190 drivers/net/wireguard/send.c:51
process_one_work+0x471/0x840 kernel/workqueue.c:2276
worker_thread+0x686/0x9e0 kernel/workqueue.c:2422
kthread+0x3ca/0x3f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
================================================================================
================================================================================
UBSAN: object-size-mismatch in ./include/net/flow.h:197:33
member access within address 000000001597b753 with insufficient space
for an object of type 'union (anonymous union at ./include/net/flow.h:172:2)'
CPU: 1 PID: 231 Comm: kworker/u4:4 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x15e/0x1d3 lib/dump_stack.c:105
ubsan_epilogue lib/ubsan.c:148 [inline]
handle_object_size_mismatch lib/ubsan.c:229 [inline]
ubsan_type_mismatch_common+0x1de/0x390 lib/ubsan.c:242
__ubsan_handle_type_mismatch_v1+0x41/0x50 lib/ubsan.c:271
flowi4_to_flowi_common include/net/flow.h:197 [inline]
send4+0x3aa/0xdd0 drivers/net/wireguard/socket.c:52
wg_socket_send_skb_to_peer+0xc7/0x200 drivers/net/wireguard/socket.c:174
wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
wg_packet_handshake_send_worker+0x14a/0x190 drivers/net/wireguard/send.c:51
process_one_work+0x471/0x840 kernel/workqueue.c:2276
worker_thread+0x686/0x9e0 kernel/workqueue.c:2422
kthread+0x3ca/0x3f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
================================================================================
Tested on:
commit: b91db6a0 Merge tag 'for-5.15/io_uring-vfs-2021-08-30' ..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=11740133300000
kernel config: https://syzkaller.appspot.com/x/.config?x=7d1b73d0f1d597e4
dashboard link: https://syzkaller.appspot.com/bug?extid=c613e88b3093ebf3686e
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1
patch: https://syzkaller.appspot.com/x/patch.diff?x=13a44435300000
^ permalink raw reply [flat|nested] 9+ messages in thread
[parent not found: <20210903042820.2733-1-hdanton@sina.com>]
* Re: [syzbot] WARNING: refcount bug in qrtr_node_lookup
[not found] <20210903042820.2733-1-hdanton@sina.com>
@ 2021-09-03 11:04 ` syzbot
0 siblings, 0 replies; 9+ messages in thread
From: syzbot @ 2021-09-03 11:04 UTC (permalink / raw)
To: bjorn.andersson, dan.carpenter, eric.dumazet, hdanton,
linux-kernel, manivannan.sadhasivam, netdev, paul,
syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
UBSAN: object-size-mismatch in wg_xmit
================================================================================
UBSAN: object-size-mismatch in ./include/linux/skbuff.h:2048:28
member access within address 0000000096a277f4 with insufficient space
for an object of type 'struct sk_buff'
CPU: 0 PID: 3568 Comm: kworker/0:5 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x15e/0x1d3 lib/dump_stack.c:105
ubsan_epilogue lib/ubsan.c:151 [inline]
handle_object_size_mismatch lib/ubsan.c:232 [inline]
ubsan_type_mismatch_common+0x1de/0x390 lib/ubsan.c:245
__ubsan_handle_type_mismatch_v1+0x41/0x50 lib/ubsan.c:274
__skb_queue_before include/linux/skbuff.h:2048 [inline]
__skb_queue_tail include/linux/skbuff.h:2081 [inline]
wg_xmit+0x4da/0xa60 drivers/net/wireguard/device.c:182
__netdev_start_xmit include/linux/netdevice.h:4970 [inline]
netdev_start_xmit+0x7b/0x140 include/linux/netdevice.h:4984
xmit_one net/core/dev.c:3576 [inline]
dev_hard_start_xmit+0x182/0x2e0 net/core/dev.c:3592
__dev_queue_xmit+0x13b0/0x21a0 net/core/dev.c:4202
neigh_output include/net/neighbour.h:510 [inline]
ip6_finish_output2+0xc51/0x11b0 net/ipv6/ip6_output.c:126
dst_output include/net/dst.h:450 [inline]
NF_HOOK include/linux/netfilter.h:307 [inline]
ndisc_send_skb+0x835/0xcf0 net/ipv6/ndisc.c:508
addrconf_dad_completed+0x6c5/0xa70 net/ipv6/addrconf.c:4203
addrconf_dad_work+0xba5/0x1510 net/ipv6/addrconf.c:3970
process_one_work+0x4b5/0x8d0 kernel/workqueue.c:2297
worker_thread+0x686/0x9e0 kernel/workqueue.c:2444
kthread+0x3ca/0x3f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
================================================================================
================================================================================
UBSAN: object-size-mismatch in ./include/linux/skbuff.h:1941:2
member access within address 0000000096a277f4 with insufficient space
for an object of type 'struct sk_buff'
CPU: 0 PID: 3568 Comm: kworker/0:5 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x15e/0x1d3 lib/dump_stack.c:105
ubsan_epilogue lib/ubsan.c:151 [inline]
handle_object_size_mismatch lib/ubsan.c:232 [inline]
ubsan_type_mismatch_common+0x1de/0x390 lib/ubsan.c:245
__ubsan_handle_type_mismatch_v1+0x41/0x50 lib/ubsan.c:274
__skb_insert include/linux/skbuff.h:1941 [inline]
__skb_queue_before include/linux/skbuff.h:2048 [inline]
__skb_queue_tail include/linux/skbuff.h:2081 [inline]
wg_xmit+0x53c/0xa60 drivers/net/wireguard/device.c:182
__netdev_start_xmit include/linux/netdevice.h:4970 [inline]
netdev_start_xmit+0x7b/0x140 include/linux/netdevice.h:4984
xmit_one net/core/dev.c:3576 [inline]
dev_hard_start_xmit+0x182/0x2e0 net/core/dev.c:3592
__dev_queue_xmit+0x13b0/0x21a0 net/core/dev.c:4202
neigh_output include/net/neighbour.h:510 [inline]
ip6_finish_output2+0xc51/0x11b0 net/ipv6/ip6_output.c:126
dst_output include/net/dst.h:450 [inline]
NF_HOOK include/linux/netfilter.h:307 [inline]
ndisc_send_skb+0x835/0xcf0 net/ipv6/ndisc.c:508
addrconf_dad_completed+0x6c5/0xa70 net/ipv6/addrconf.c:4203
addrconf_dad_work+0xba5/0x1510 net/ipv6/addrconf.c:3970
process_one_work+0x4b5/0x8d0 kernel/workqueue.c:2297
worker_thread+0x686/0x9e0 kernel/workqueue.c:2444
kthread+0x3ca/0x3f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
================================================================================
IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
Tested on:
commit: a9c9a6f7 Merge tag 'scsi-misc' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=134c5b6d300000
kernel config: https://syzkaller.appspot.com/x/.config?x=5f845e3d82a95a0e
dashboard link: https://syzkaller.appspot.com/bug?extid=c613e88b3093ebf3686e
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1
patch: https://syzkaller.appspot.com/x/patch.diff?x=14673df5300000
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