[syzbot ci] Re: Support non-linear skbs for BPF_PROG_TEST_RUN
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syzbot ci
Oct 2, 2025, 2:48:44 AM (yesterday) Oct 2
to amer...@gmail.com, and...@kernel.org, a...@kernel.org, b...@vger.kernel.org, dan...@iogearbox.net, edd...@gmail.com, marti...@linux.dev, paul.c...@gmail.com, syz...@lists.linux.dev, syzkall...@googlegroups.com
syzbot ci has tested the following series
[v4] Support non-linear skbs for BPF_PROG_TEST_RUN
https://lore.kernel.org/all/cover.1759341538....@gmail.com
* [PATCH bpf-next v4 1/5] bpf: Refactor cleanup of bpf_prog_test_run_skb
* [PATCH bpf-next v4 2/5] bpf: Reorder bpf_prog_test_run_skb initialization
* [PATCH bpf-next v4 3/5] bpf: Craft non-linear skbs in BPF_PROG_TEST_RUN
* [PATCH bpf-next v4 4/5] selftests/bpf: Support non-linear flag in test loader
* [PATCH bpf-next v4 5/5] selftests/bpf: Test direct packet access on non-linear skbs
and found the following issue:
KASAN: invalid-free in bpf_prog_test_run_skb
Full report is available here:
https://ci.syzbot.org/series/356d4048-147c-4079-ae1f-94b437c8f9ef
***
KASAN: invalid-free in bpf_prog_test_run_skb
tree: bpf-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git
base: 4ef77dd584cfd915526328f516fec59e3a54d66e
arch: amd64
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
config: https://ci.syzbot.org/builds/e93ac4a0-f0c0-48d2-b7f6-3c9dfeba06d8/config
C repro: https://ci.syzbot.org/findings/d21cac8a-ab8d-4fbe-972c-dd47b243d83e/c_repro
syz repro: https://ci.syzbot.org/findings/d21cac8a-ab8d-4fbe-972c-dd47b243d83e/syz_repro
==================================================================
BUG: KASAN: double-free in bpf_prog_test_run_skb+0x568/0x1bd0 net/bpf/test_run.c:1198
Free of addr ffff88810f002c00 by task syz.0.17/5995
CPU: 1 UID: 0 PID: 5995 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report_invalid_free+0xea/0x110 mm/kasan/report.c:557
check_slab_allocation+0xe1/0x130 include/linux/page-flags.h:-1
kasan_slab_pre_free include/linux/kasan.h:198 [inline]
slab_free_hook mm/slub.c:2367 [inline]
slab_free mm/slub.c:4695 [inline]
kfree+0x13f/0x440 mm/slub.c:4894
bpf_prog_test_run_skb+0x568/0x1bd0 net/bpf/test_run.c:1198
bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4673
__sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6152
__do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fba7578ec29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd3f323258 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fba759d5fa0 RCX: 00007fba7578ec29
RDX: 0000000000000050 RSI: 0000200000002300 RDI: 000000000000000a
RBP: 00007fba75811e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fba759d5fa0 R14: 00007fba759d5fa0 R15: 0000000000000003
</TASK>
Allocated by task 5995:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_krealloc+0xe7/0x140 mm/kasan/common.c:475
kasan_krealloc include/linux/kasan.h:280 [inline]
__do_krealloc mm/slub.c:4953 [inline]
krealloc_noprof+0x1b8/0x340 mm/slub.c:5010
__slab_build_skb net/core/skbuff.c:400 [inline]
slab_build_skb+0x8b/0x3e0 net/core/skbuff.c:420
bpf_prog_test_run_skb+0x41b/0x1bd0 net/bpf/test_run.c:1058
bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4673
__sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6152
__do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 5995:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:243 [inline]
__kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2422 [inline]
slab_free mm/slub.c:4695 [inline]
kfree+0x18e/0x440 mm/slub.c:4894
skb_release_data+0x62d/0x7c0 net/core/skbuff.c:1086
skb_release_all net/core/skbuff.c:1151 [inline]
__kfree_skb net/core/skbuff.c:1165 [inline]
sk_skb_reason_drop+0x127/0x170 net/core/skbuff.c:1203
vti_tunnel_xmit+0xf5a/0x18b0 net/ipv4/ip_vti.c:-1
__netdev_start_xmit include/linux/netdevice.h:5222 [inline]
netdev_start_xmit include/linux/netdevice.h:5231 [inline]
xmit_one net/core/dev.c:3839 [inline]
dev_hard_start_xmit+0x2d7/0x830 net/core/dev.c:3855
__dev_queue_xmit+0x1b8d/0x3b50 net/core/dev.c:4725
dev_queue_xmit include/linux/netdevice.h:3361 [inline]
__bpf_tx_skb+0x18e/0x260 net/core/filter.c:2153
____bpf_clone_redirect net/core/filter.c:2478 [inline]
bpf_clone_redirect+0x272/0x3d0 net/core/filter.c:2448
bpf_prog_69c2527fbc57d46b+0x5f/0x68
bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline]
__bpf_prog_run include/linux/filter.h:721 [inline]
bpf_prog_run include/linux/filter.h:728 [inline]
bpf_test_run+0x318/0x7b0 net/bpf/test_run.c:434
bpf_prog_test_run_skb+0xd42/0x1bd0 net/bpf/test_run.c:1153
bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4673
__sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6152
__do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88810f002c00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
512-byte region [ffff88810f002c00, ffff88810f002e00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10f000
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801a441c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff88801a441c80 dead000000000122 0000000000000000
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea00043c0001 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5965, tgid 5965 (udevd), ts 56045734118, free_ts 55352678471
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2492 [inline]
allocate_slab+0x8a/0x370 mm/slub.c:2660
new_slab mm/slub.c:2714 [inline]
___slab_alloc+0xbeb/0x1420 mm/slub.c:3901
__slab_alloc mm/slub.c:3992 [inline]
__slab_alloc_node mm/slub.c:4067 [inline]
slab_alloc_node mm/slub.c:4228 [inline]
__kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4402
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
kernfs_fop_open+0x397/0xca0 fs/kernfs/file.c:623
do_dentry_open+0x953/0x13f0 fs/open.c:965
vfs_open+0x3b/0x340 fs/open.c:1095
do_open fs/namei.c:3887 [inline]
path_openat+0x2ee5/0x3830 fs/namei.c:4046
do_filp_open+0x1fa/0x410 fs/namei.c:4073
do_sys_openat2+0x121/0x1c0 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_openat fs/open.c:1466 [inline]
__se_sys_openat fs/open.c:1461 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1461
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5594 tgid 5594 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895
discard_slab mm/slub.c:2758 [inline]
__put_partials+0x156/0x1a0 mm/slub.c:3223
put_cpu_partial+0x17c/0x250 mm/slub.c:3298
__slab_free+0x2d5/0x3c0 mm/slub.c:4565
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:340
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4191 [inline]
slab_alloc_node mm/slub.c:4240 [inline]
kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4292
__alloc_skb+0x112/0x2d0 net/core/skbuff.c:659
netlink_sendmsg+0x5c6/0xb30 net/netlink/af_netlink.c:1871
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:729
__sys_sendto+0x3bd/0x520 net/socket.c:2228
__do_sys_sendto net/socket.c:2235 [inline]
__se_sys_sendto net/socket.c:2231 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2231
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88810f002b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88810f002b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88810f002c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88810f002c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88810f002d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
***
If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syz...@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzk...@googlegroups.com.
[v4] Support non-linear skbs for BPF_PROG_TEST_RUN
https://lore.kernel.org/all/cover.1759341538....@gmail.com
* [PATCH bpf-next v4 1/5] bpf: Refactor cleanup of bpf_prog_test_run_skb
* [PATCH bpf-next v4 2/5] bpf: Reorder bpf_prog_test_run_skb initialization
* [PATCH bpf-next v4 3/5] bpf: Craft non-linear skbs in BPF_PROG_TEST_RUN
* [PATCH bpf-next v4 4/5] selftests/bpf: Support non-linear flag in test loader
* [PATCH bpf-next v4 5/5] selftests/bpf: Test direct packet access on non-linear skbs
and found the following issue:
KASAN: invalid-free in bpf_prog_test_run_skb
Full report is available here:
https://ci.syzbot.org/series/356d4048-147c-4079-ae1f-94b437c8f9ef
***
KASAN: invalid-free in bpf_prog_test_run_skb
tree: bpf-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git
base: 4ef77dd584cfd915526328f516fec59e3a54d66e
arch: amd64
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
config: https://ci.syzbot.org/builds/e93ac4a0-f0c0-48d2-b7f6-3c9dfeba06d8/config
C repro: https://ci.syzbot.org/findings/d21cac8a-ab8d-4fbe-972c-dd47b243d83e/c_repro
syz repro: https://ci.syzbot.org/findings/d21cac8a-ab8d-4fbe-972c-dd47b243d83e/syz_repro
==================================================================
BUG: KASAN: double-free in bpf_prog_test_run_skb+0x568/0x1bd0 net/bpf/test_run.c:1198
Free of addr ffff88810f002c00 by task syz.0.17/5995
CPU: 1 UID: 0 PID: 5995 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report_invalid_free+0xea/0x110 mm/kasan/report.c:557
check_slab_allocation+0xe1/0x130 include/linux/page-flags.h:-1
kasan_slab_pre_free include/linux/kasan.h:198 [inline]
slab_free_hook mm/slub.c:2367 [inline]
slab_free mm/slub.c:4695 [inline]
kfree+0x13f/0x440 mm/slub.c:4894
bpf_prog_test_run_skb+0x568/0x1bd0 net/bpf/test_run.c:1198
bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4673
__sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6152
__do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fba7578ec29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd3f323258 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fba759d5fa0 RCX: 00007fba7578ec29
RDX: 0000000000000050 RSI: 0000200000002300 RDI: 000000000000000a
RBP: 00007fba75811e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fba759d5fa0 R14: 00007fba759d5fa0 R15: 0000000000000003
</TASK>
Allocated by task 5995:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_krealloc+0xe7/0x140 mm/kasan/common.c:475
kasan_krealloc include/linux/kasan.h:280 [inline]
__do_krealloc mm/slub.c:4953 [inline]
krealloc_noprof+0x1b8/0x340 mm/slub.c:5010
__slab_build_skb net/core/skbuff.c:400 [inline]
slab_build_skb+0x8b/0x3e0 net/core/skbuff.c:420
bpf_prog_test_run_skb+0x41b/0x1bd0 net/bpf/test_run.c:1058
bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4673
__sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6152
__do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 5995:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:243 [inline]
__kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2422 [inline]
slab_free mm/slub.c:4695 [inline]
kfree+0x18e/0x440 mm/slub.c:4894
skb_release_data+0x62d/0x7c0 net/core/skbuff.c:1086
skb_release_all net/core/skbuff.c:1151 [inline]
__kfree_skb net/core/skbuff.c:1165 [inline]
sk_skb_reason_drop+0x127/0x170 net/core/skbuff.c:1203
vti_tunnel_xmit+0xf5a/0x18b0 net/ipv4/ip_vti.c:-1
__netdev_start_xmit include/linux/netdevice.h:5222 [inline]
netdev_start_xmit include/linux/netdevice.h:5231 [inline]
xmit_one net/core/dev.c:3839 [inline]
dev_hard_start_xmit+0x2d7/0x830 net/core/dev.c:3855
__dev_queue_xmit+0x1b8d/0x3b50 net/core/dev.c:4725
dev_queue_xmit include/linux/netdevice.h:3361 [inline]
__bpf_tx_skb+0x18e/0x260 net/core/filter.c:2153
____bpf_clone_redirect net/core/filter.c:2478 [inline]
bpf_clone_redirect+0x272/0x3d0 net/core/filter.c:2448
bpf_prog_69c2527fbc57d46b+0x5f/0x68
bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline]
__bpf_prog_run include/linux/filter.h:721 [inline]
bpf_prog_run include/linux/filter.h:728 [inline]
bpf_test_run+0x318/0x7b0 net/bpf/test_run.c:434
bpf_prog_test_run_skb+0xd42/0x1bd0 net/bpf/test_run.c:1153
bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4673
__sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6152
__do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88810f002c00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
512-byte region [ffff88810f002c00, ffff88810f002e00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10f000
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801a441c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff88801a441c80 dead000000000122 0000000000000000
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea00043c0001 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5965, tgid 5965 (udevd), ts 56045734118, free_ts 55352678471
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2492 [inline]
allocate_slab+0x8a/0x370 mm/slub.c:2660
new_slab mm/slub.c:2714 [inline]
___slab_alloc+0xbeb/0x1420 mm/slub.c:3901
__slab_alloc mm/slub.c:3992 [inline]
__slab_alloc_node mm/slub.c:4067 [inline]
slab_alloc_node mm/slub.c:4228 [inline]
__kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4402
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
kernfs_fop_open+0x397/0xca0 fs/kernfs/file.c:623
do_dentry_open+0x953/0x13f0 fs/open.c:965
vfs_open+0x3b/0x340 fs/open.c:1095
do_open fs/namei.c:3887 [inline]
path_openat+0x2ee5/0x3830 fs/namei.c:4046
do_filp_open+0x1fa/0x410 fs/namei.c:4073
do_sys_openat2+0x121/0x1c0 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_openat fs/open.c:1466 [inline]
__se_sys_openat fs/open.c:1461 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1461
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5594 tgid 5594 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895
discard_slab mm/slub.c:2758 [inline]
__put_partials+0x156/0x1a0 mm/slub.c:3223
put_cpu_partial+0x17c/0x250 mm/slub.c:3298
__slab_free+0x2d5/0x3c0 mm/slub.c:4565
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:340
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4191 [inline]
slab_alloc_node mm/slub.c:4240 [inline]
kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4292
__alloc_skb+0x112/0x2d0 net/core/skbuff.c:659
netlink_sendmsg+0x5c6/0xb30 net/netlink/af_netlink.c:1871
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:729
__sys_sendto+0x3bd/0x520 net/socket.c:2228
__do_sys_sendto net/socket.c:2235 [inline]
__se_sys_sendto net/socket.c:2231 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2231
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88810f002b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88810f002b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88810f002c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88810f002c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88810f002d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
***
If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syz...@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzk...@googlegroups.com.
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