* [syzbot] [net?] WARNING in stack_depot_save_flags (2)
@ 2026-05-19 17:48 syzbot
2026-08-15 12:36 ` syzbot
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2026-05-19 17:48 UTC (permalink / raw)
To: davem, edumazet, horms, kuba, linux-kernel, netdev, pabeni,
syzkaller-bugs, willemdebruijn.kernel
Hello,
syzbot found the following issue on:
HEAD commit: 70eda68668d1 Merge tag 'hid-for-linus-2026051401' of git:/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13291bce580000
kernel config: https://syzkaller.appspot.com/x/.config?x=59da38148f3a3d24
dashboard link: https://syzkaller.appspot.com/bug?extid=1827030ed7bc886dd0a5
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-70eda686.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7c7af75df257/vmlinux-70eda686.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a8cc495201bd/bzImage-70eda686.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1827030ed7bc886dd0a5@syzkaller.appspotmail.com
------------[ cut here ]------------
Stack depot reached limit capacity
WARNING: lib/stackdepot.c:302 at depot_init_pool lib/stackdepot.c:302 [inline], CPU#0: kworker/u32:17/13749
WARNING: lib/stackdepot.c:302 at depot_pop_free_pool lib/stackdepot.c:371 [inline], CPU#0: kworker/u32:17/13749
WARNING: lib/stackdepot.c:302 at depot_alloc_stack lib/stackdepot.c:462 [inline], CPU#0: kworker/u32:17/13749
WARNING: lib/stackdepot.c:302 at stack_depot_save_flags+0x9a2/0x9d0 lib/stackdepot.c:706, CPU#0: kworker/u32:17/13749
Modules linked in:
CPU: 0 UID: 0 PID: 13749 Comm: kworker/u32:17 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:depot_init_pool lib/stackdepot.c:302 [inline]
RIP: 0010:depot_pop_free_pool lib/stackdepot.c:371 [inline]
RIP: 0010:depot_alloc_stack lib/stackdepot.c:462 [inline]
RIP: 0010:stack_depot_save_flags+0x9a2/0x9d0 lib/stackdepot.c:706
Code: 0b 90 eb bf 48 85 ed 74 c6 48 89 2d a0 de 17 16 48 89 ea 31 ed e9 0b ff ff ff 39 c1 72 1f 48 85 d2 74 20 48 8d 3d ae e6 b3 0b <67> 48 0f b9 3a 45 31 f6 48 85 ed 0f 85 37 fa ff ff eb 92 90 0f 0b
RSP: 0018:ffffc900000072e0 EFLAGS: 00010086
RAX: 0000000000002000 RBX: 0000000000000000 RCX: 0000000000002000
RDX: ffff8880460f8000 RSI: ffffffff8defc944 RDI: ffffffff90e25c00
RBP: 0000000000000000 R08: 000000001c62ad74 R09: 000000002f4d0daf
R10: 0000000000000150 R11: 0000000000000000 R12: ffffc90000007338
R13: 0000000000000025 R14: ffff88816d70daf0 R15: ffff88816d70daf0
FS: 0000000000000000(0000) GS:ffff8880d6370000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555c1b6ff300 CR3: 000000000e596000 CR4: 0000000000352ef0
Call Trace:
<IRQ>
kasan_save_stack+0x3f/0x50 mm/kasan/common.c:58
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2689 [inline]
slab_free mm/slub.c:6250 [inline]
kmem_cache_free+0x127/0x6c0 mm/slub.c:6377
kfree_skbmem+0x19a/0x210 net/core/skbuff.c:1137
__kfree_skb net/core/skbuff.c:1204 [inline]
sk_skb_reason_drop+0x10f/0x1b0 net/core/skbuff.c:1241
packet_rcv+0x16c/0x17b0 net/packet/af_packet.c:2224
dev_queue_xmit_nit+0x6fc/0xa60 net/core/dev.c:2606
xmit_one net/core/dev.c:3884 [inline]
dev_hard_start_xmit+0x2fc/0x7a0 net/core/dev.c:3904
__dev_queue_xmit+0x1baa/0x4950 net/core/dev.c:4870
lapb_data_transmit+0x96/0xc0 net/lapb/lapb_iface.c:447
lapb_transmit_buffer+0xce/0x3a0 net/lapb/lapb_out.c:149
lapb_send_control+0x1ce/0x330 net/lapb/lapb_subr.c:251
lapb_establish_data_link+0xeb/0x110 net/lapb/lapb_out.c:163
lapb_state3_machine net/lapb/lapb_in.c:445 [inline]
lapb_data_input+0xc45/0x19d0 net/lapb/lapb_in.c:550
lapb_data_received+0x65/0xf0 net/lapb/lapb_iface.c:399
lapbeth_rcv+0x3a6/0x6e0 drivers/net/wan/lapbether.c:142
__netif_receive_skb_one_core+0x1b2/0x1e0 net/core/dev.c:6202
__netif_receive_skb+0x1f/0x120 net/core/dev.c:6315
process_backlog+0x37a/0x1580 net/core/dev.c:6666
__napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7733
napi_poll net/core/dev.c:7796 [inline]
net_rx_action+0xa40/0xf20 net/core/dev.c:7953
handle_softirqs+0x1ea/0xa00 kernel/softirq.c:622
do_softirq kernel/softirq.c:523 [inline]
do_softirq+0xac/0xe0 kernel/softirq.c:510
</IRQ>
<TASK>
__local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:450
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_purge_outstanding_packets+0xc0/0x290 net/batman-adv/send.c:1110
batadv_hardif_disable_interface.cold+0x316/0x80b net/batman-adv/hard-interface.c:847
batadv_meshif_destroy_netlink+0x79/0x150 net/batman-adv/mesh-interface.c:1093
default_device_exit_batch+0x70c/0xc10 net/core/dev.c:13071
ops_exit_list net/core/net_namespace.c:205 [inline]
ops_undo_list+0x363/0xab0 net/core/net_namespace.c:252
cleanup_net+0x499/0x920 net/core/net_namespace.c:702
process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314
process_scheduled_works kernel/workqueue.c:3397 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
----------------
Code disassembly (best guess):
0: 0b 90 eb bf 48 85 or -0x7ab74015(%rax),%edx
6: ed in (%dx),%eax
7: 74 c6 je 0xffffffcf
9: 48 89 2d a0 de 17 16 mov %rbp,0x1617dea0(%rip) # 0x1617deb0
10: 48 89 ea mov %rbp,%rdx
13: 31 ed xor %ebp,%ebp
15: e9 0b ff ff ff jmp 0xffffff25
1a: 39 c1 cmp %eax,%ecx
1c: 72 1f jb 0x3d
1e: 48 85 d2 test %rdx,%rdx
21: 74 20 je 0x43
23: 48 8d 3d ae e6 b3 0b lea 0xbb3e6ae(%rip),%rdi # 0xbb3e6d8
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 45 31 f6 xor %r14d,%r14d
32: 48 85 ed test %rbp,%rbp
35: 0f 85 37 fa ff ff jne 0xfffffa72
3b: eb 92 jmp 0xffffffcf
3d: 90 nop
3e: 0f 0b ud2
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] [net?] WARNING in stack_depot_save_flags (2)
2026-05-19 17:48 [syzbot] [net?] WARNING in stack_depot_save_flags (2) syzbot
@ 2026-08-15 12:36 ` syzbot
0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2026-08-15 12:36 UTC (permalink / raw)
To: davem, edumazet, horms, kuba, linux-kernel, netdev, pabeni,
syzkaller-bugs, willemdebruijn.kernel
syzbot has found a reproducer for the following issue on:
HEAD commit: 15ef2f78c49d Merge tag 'input-for-v7.2-rc7' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15b53279580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1d67342c314f228d
dashboard link: https://syzkaller.appspot.com/bug?extid=1827030ed7bc886dd0a5
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=137fa949580000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1827030ed7bc886dd0a5@syzkaller.appspotmail.com
------------[ cut here ]------------
Stack depot reached limit capacity
WARNING: lib/stackdepot.c:302 at depot_init_pool lib/stackdepot.c:302 [inline], CPU#1: syz-executor190/6024
WARNING: lib/stackdepot.c:302 at depot_pop_free_pool lib/stackdepot.c:371 [inline], CPU#1: syz-executor190/6024
WARNING: lib/stackdepot.c:302 at depot_alloc_stack lib/stackdepot.c:462 [inline], CPU#1: syz-executor190/6024
WARNING: lib/stackdepot.c:302 at stack_depot_save_flags+0x9a2/0x9d0 lib/stackdepot.c:706, CPU#1: syz-executor190/6024
Modules linked in:
CPU: 1 UID: 0 PID: 6024 Comm: syz-executor190 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:depot_init_pool lib/stackdepot.c:302 [inline]
RIP: 0010:depot_pop_free_pool lib/stackdepot.c:371 [inline]
RIP: 0010:depot_alloc_stack lib/stackdepot.c:462 [inline]
RIP: 0010:stack_depot_save_flags+0x9a2/0x9d0 lib/stackdepot.c:706
Code: 0b 90 eb bf 48 85 ed 74 c6 48 89 2d 80 32 6c 16 48 89 ea 31 ed e9 0b ff ff ff 39 c1 72 1f 48 85 d2 74 20 48 8d 3d 6e e9 f9 0b <67> 48 0f b9 3a 45 31 f6 48 85 ed 0f 85 37 fa ff ff eb 92 90 0f 0b
RSP: 0018:ffffc90003d5f240 EFLAGS: 00010086
RAX: 0000000000002000 RBX: 0000000000000000 RCX: 0000000000002000
RDX: ffff88804f060000 RSI: ffffffff8e387082 RDI: ffffffff914d07e0
RBP: 0000000000000000 R08: 0000000000000001 R09: 000000001f92056e
R10: 00000000000000a0 R11: 0000000000000000 R12: ffffc90003d5f298
R13: 000000000000000f R14: ffff88816cc056e0 R15: ffff88816cc056e0
FS: 0000555582e6b400(0000) GS:ffff8880d5cde000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556e2ead1be0 CR3: 00000000368af000 CR4: 0000000000352ef0
Call Trace:
<TASK>
kasan_save_stack+0x3f/0x50 mm/kasan/common.c:58
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4584 [inline]
slab_alloc_node mm/slub.c:4917 [inline]
kmem_cache_alloc_node_noprof+0x27d/0x6b0 mm/slub.c:4989
kmalloc_reserve+0x148/0x350 net/core/skbuff.c:615
pskb_expand_head+0x249/0x10e0 net/core/skbuff.c:2312
skb_ensure_writable+0x2e9/0x480 net/core/skbuff.c:6377
__bpf_try_make_writable net/core/filter.c:1685 [inline]
bpf_try_make_writable net/core/filter.c:1691 [inline]
bpf_try_make_head_writable net/core/filter.c:1699 [inline]
____bpf_clone_redirect net/core/filter.c:2491 [inline]
bpf_clone_redirect+0x1f7/0x500 net/core/filter.c:2460
bpf_prog_93719f3005523967+0x168e/0x33be
bpf_dispatcher_nop_func include/linux/bpf.h:1454 [inline]
__bpf_prog_run include/linux/filter.h:724 [inline]
bpf_prog_run include/linux/filter.h:731 [inline]
bpf_test_run+0x39c/0xa40 net/bpf/test_run.c:422
bpf_prog_test_run_skb+0x15c4/0x3540 net/bpf/test_run.c:1225
bpf_prog_test_run kernel/bpf/syscall.c:4859 [inline]
__sys_bpf+0x2a12/0x4e80 kernel/bpf/syscall.c:6436
__do_sys_bpf kernel/bpf/syscall.c:6537 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6534 [inline]
__x64_sys_bpf+0xce/0x140 kernel/bpf/syscall.c:6534
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe84f88ff59
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff9fca9ef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe84f88ff59
RDX: 0000000000000098 RSI: 00007fff9fcaa040 RDI: 000000000000000a
RBP: 0000000d00000085 R08: 0000555582e74770 R09: 0000555582e74770
R10: 00007fe84f9181a0 R11: 0000000000000246 R12: 00000001000002b7
R13: 00000000000001ce R14: 0000555582e6c760 R15: 0000000000000e14
</TASK>
----------------
Code disassembly (best guess):
0: 0b 90 eb bf 48 85 or -0x7ab74015(%rax),%edx
6: ed in (%dx),%eax
7: 74 c6 je 0xffffffcf
9: 48 89 2d 80 32 6c 16 mov %rbp,0x166c3280(%rip) # 0x166c3290
10: 48 89 ea mov %rbp,%rdx
13: 31 ed xor %ebp,%ebp
15: e9 0b ff ff ff jmp 0xffffff25
1a: 39 c1 cmp %eax,%ecx
1c: 72 1f jb 0x3d
1e: 48 85 d2 test %rdx,%rdx
21: 74 20 je 0x43
23: 48 8d 3d 6e e9 f9 0b lea 0xbf9e96e(%rip),%rdi # 0xbf9e998
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 45 31 f6 xor %r14d,%r14d
32: 48 85 ed test %rbp,%rbp
35: 0f 85 37 fa ff ff jne 0xfffffa72
3b: eb 92 jmp 0xffffffcf
3d: 90 nop
3e: 0f 0b ud2
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2026-08-15 12:36 UTC | newest]
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2026-05-19 17:48 [syzbot] [net?] WARNING in stack_depot_save_flags (2) syzbot
2026-08-15 12:36 ` syzbot
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