Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 2997 Comm: kworker/u8:9 Not tainted 6.14.0-next-20250331-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound bpf_map_free_deferred
RIP: 0010:free_all kernel/bpf/memalloc.c:268 [inline]
RIP: 0010:drain_mem_cache+0x104/0x4b0 kernel/bpf/memalloc.c:639
Code: 00 e8 40 cc 3f 00 31 db 49 87 9e b0 00 00 00 48 85 db 75 0f e8 6d af d5 ff eb 67 e8 66 af d5 ff 4c 89 fb 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 6d c9 3f 00 4c 8b 3b 45 85 e4 74
RSP: 0018:ffffc9000b5f7a20 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffffffff81eda500
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffe8ffffc6bc20
RBP: ffffe8ffffc6bb70 R08: ffffe8ffffc6bc27 R09: 1ffffd1ffff8d784
R10: dffffc0000000000 R11: fffff91ffff8d785 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffe8ffffc6bb70 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125095000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbd53005000 CR3: 000000007ad66000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
bpf_mem_alloc_destroy+0x14a/0x4e0 kernel/bpf/memalloc.c:754
trie_free+0x136/0x160 kernel/bpf/lpm_trie.c:652
bpf_map_free kernel/bpf/syscall.c:861 [inline]
bpf_map_free_deferred+0xe9/0x110 kernel/bpf/syscall.c:887
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
kthread+0x7b7/0x940 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:free_all kernel/bpf/memalloc.c:268 [inline]
RIP: 0010:drain_mem_cache+0x104/0x4b0 kernel/bpf/memalloc.c:639
Code: 00 e8 40 cc 3f 00 31 db 49 87 9e b0 00 00 00 48 85 db 75 0f e8 6d af d5 ff eb 67 e8 66 af d5 ff 4c 89 fb 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 6d c9 3f 00 4c 8b 3b 45 85 e4 74
RSP: 0018:ffffc9000b5f7a20 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffffffff81eda500
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffe8ffffc6bc20
RBP: ffffe8ffffc6bb70 R08: ffffe8ffffc6bc27 R09: 1ffffd1ffff8d784
R10: dffffc0000000000 R11: fffff91ffff8d785 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffe8ffffc6bb70 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125095000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f740cf08000 CR3: 0000000025c74000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: e8 40 cc 3f 00 call 0x3fcc45
5: 31 db xor %ebx,%ebx
7: 49 87 9e b0 00 00 00 xchg %rbx,0xb0(%r14)
e: 48 85 db test %rbx,%rbx
11: 75 0f jne 0x22
13: e8 6d af d5 ff call 0xffd5af85
18: eb 67 jmp 0x81
1a: e8 66 af d5 ff call 0xffd5af85
1f: 4c 89 fb mov %r15,%rbx
22: 48 89 d8 mov %rbx,%rax
25: 48 c1 e8 03 shr $0x3,%rax
* 29: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 48 89 df mov %rbx,%rdi
33: e8 6d c9 3f 00 call 0x3fc9a5
38: 4c 8b 3b mov (%rbx),%r15
3b: 45 85 e4 test %r12d,%r12d
3e: 74 .byte 0x74