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Message-ID: <69546dea.050a0220.a1b6.0306.GAE@google.com> Date: Tue, 30 Dec 2025 16:27:22 -0800 From: syzbot <syzbot+4fe468a3f7fac86ea2c9@...kaller.appspotmail.com> To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net, eddyz87@...il.com, haoluo@...gle.com, john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org, linux-kernel@...r.kernel.org, martin.lau@...ux.dev, sdf@...ichev.me, song@...nel.org, syzkaller-bugs@...glegroups.com, yonghong.song@...ux.dev Subject: [syzbot] [bpf?] general protection fault in bpf_get_local_storage (2) Hello, syzbot found the following issue on: HEAD commit: 3f0e9c8cefa9 Merge tag 'block-6.19-20251226' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11765022580000 kernel config: https://syzkaller.appspot.com/x/.config?x=513255d80ab78f2b dashboard link: https://syzkaller.appspot.com/bug?extid=4fe468a3f7fac86ea2c9 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1071089a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11dd1bb4580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-3f0e9c8c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/275bd6cb3fb6/vmlinux-3f0e9c8c.xz kernel image: https://storage.googleapis.com/syzbot-assets/d5311a1a21c3/bzImage-3f0e9c8c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4fe468a3f7fac86ea2c9@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: rcu_gp process_srcu RIP: 0010:____bpf_get_local_storage kernel/bpf/cgroup.c:1774 [inline] RIP: 0010:bpf_get_local_storage+0xbd/0x180 kernel/bpf/cgroup.c:1756 Code: e0 49 83 c6 08 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 a2 83 39 00 4d 8b 36 83 fb 15 75 5c 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 84 83 39 00 49 8b 1e e8 ec 7e 6c RSP: 0018:ffffc900000072d8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000015 RCX: 0000000000000100 RDX: ffff88801bef4980 RSI: 0000000000000015 RDI: 0000000000000015 RBP: ffffc90000007310 R08: 0000000000000003 R09: 0000000000000000 R10: ffffc90000007380 R11: ffffffffa0203ce4 R12: 0000000000000001 R13: ffff88801248d640 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001c40 CR3: 000000003701b000 CR4: 0000000000352ef0 Call Trace: <IRQ> bpf_prog_e63b106389d7305a+0x2e/0x45 bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] __bpf_prog_run_save_cb+0x127/0x370 include/linux/filter.h:980 bpf_prog_run_array_cg kernel/bpf/cgroup.c:81 [inline] __cgroup_bpf_run_filter_skb+0x9e0/0xf40 kernel/bpf/cgroup.c:1612 sk_filter_trim_cap+0xd42/0xf50 net/core/filter.c:150 tcp_filter net/ipv4/tcp_ipv4.c:2117 [inline] tcp_v4_rcv+0x1f90/0x2f20 net/ipv4/tcp_ipv4.c:2304 ip_protocol_deliver_rcu+0x221/0x440 net/ipv4/ip_input.c:207 ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:241 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6137 [inline] __netif_receive_skb+0x143/0x380 net/core/dev.c:6250 process_backlog+0x54f/0x1340 net/core/dev.c:6602 __napi_poll+0xae/0x320 net/core/dev.c:7666 napi_poll net/core/dev.c:7729 [inline] net_rx_action+0x64a/0xe00 net/core/dev.c:7881 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:delay_loop+0x20/0x30 arch/x86/lib/delay.c:44 Code: 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 f8 48 85 c0 74 19 eb 02 66 90 eb 0e 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 <48> ff c8 75 fb 48 ff c8 c3 cc cc cc cc cc 66 90 90 90 90 90 90 90 RSP: 0018:ffffc900001b78d0 EFLAGS: 00000216 RAX: 00000000000022ff RBX: 0000000000000001 RCX: 0000000008583a9c RDX: 00000000000036b0 RSI: 0000000000000008 RDI: 00000000000036b1 RBP: 0000000000000001 R08: ffff88801fc42b47 R09: 1ffff11003f88568 R10: dffffc0000000000 R11: ffffffff8b5a31d0 R12: 0000000000000001 R13: 0000000000004fb8 R14: ffff88801fc42b60 R15: dffffc0000000000 udelay include/asm-generic/delay.h:64 [inline] try_check_zero+0x412/0x470 kernel/rcu/srcutree.c:1182 srcu_advance_state kernel/rcu/srcutree.c:1886 [inline] process_srcu+0x2d3/0x1220 kernel/rcu/srcutree.c:1995 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:____bpf_get_local_storage kernel/bpf/cgroup.c:1774 [inline] RIP: 0010:bpf_get_local_storage+0xbd/0x180 kernel/bpf/cgroup.c:1756 Code: e0 49 83 c6 08 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 a2 83 39 00 4d 8b 36 83 fb 15 75 5c 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 84 83 39 00 49 8b 1e e8 ec 7e 6c RSP: 0018:ffffc900000072d8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000015 RCX: 0000000000000100 RDX: ffff88801bef4980 RSI: 0000000000000015 RDI: 0000000000000015 RBP: ffffc90000007310 R08: 0000000000000003 R09: 0000000000000000 R10: ffffc90000007380 R11: ffffffffa0203ce4 R12: 0000000000000001 R13: ffff88801248d640 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001c40 CR3: 000000003701b000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: e0 49 loopne 0x4b 2: 83 c6 08 add $0x8,%esi 5: 4c 89 f0 mov %r14,%rax 8: 48 c1 e8 03 shr $0x3,%rax c: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 11: 74 08 je 0x1b 13: 4c 89 f7 mov %r14,%rdi 16: e8 a2 83 39 00 call 0x3983bd 1b: 4d 8b 36 mov (%r14),%r14 1e: 83 fb 15 cmp $0x15,%ebx 21: 75 5c jne 0x7f 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 f7 mov %r14,%rdi 34: e8 84 83 39 00 call 0x3983bd 39: 49 8b 1e mov (%r14),%rbx 3c: e8 .byte 0xe8 3d: ec in (%dx),%al 3e: 7e 6c jle 0xac --- 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@...glegroups.com. 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: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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