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Message-ID: <000000000000c7b8a5061dc25477@google.com> Date: Sun, 21 Jul 2024 06:59:03 -0700 From: syzbot <syzbot+707d98c8649695eaf329@...kaller.appspotmail.com> To: aha310510@...il.com, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [bpf?] [net?] KASAN: slab-use-after-free Read in bq_xmit_all Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in __cpu_map_flush Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 6414 Comm: syz.0.248 Not tainted 6.10.0-syzkaller-11185-g2c9b3512402e-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 RIP: 0010:__cpu_map_flush+0x42/0xd0 Code: e8 93 d9 d6 ff 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 bd ce 39 00 49 8b 1e 4c 39 f3 74 77 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 9f ce 39 00 4c 8b 23 48 8d 7b c0 RSP: 0018:ffffc90000a18b10 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88806b371e00 RDX: 0000000080000100 RSI: 0000000000000010 RDI: ffffc9000319f800 RBP: dffffc0000000000 R08: ffffffff895fbdfa R09: 1ffffffff1f5d135 R10: dffffc0000000000 R11: fffffbfff1f5d136 R12: ffffc9000319f800 R13: ffffc9000319f820 R14: ffffc9000319f800 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3b96706030 CR3: 0000000025528000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> xdp_do_check_flushed+0x136/0x240 net/core/filter.c:4304 __napi_poll+0xe4/0x490 net/core/dev.c:6774 napi_poll net/core/dev.c:6840 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:6962 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5763 Code: 2b 00 74 08 4c 89 f7 e8 1a cb 86 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25 RSP: 0018:ffffc9000319f8c0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff92000633f24 RCX: a82dc8c22c65f400 RDX: dffffc0000000000 RSI: ffffffff8bcadea0 RDI: ffffffff8c1f9a00 RBP: ffffc9000319fa08 R08: ffffffff92fd0607 R09: 1ffffffff25fa0c0 R10: dffffc0000000000 R11: fffffbfff25fa0c1 R12: 1ffff92000633f20 R13: dffffc0000000000 R14: ffffc9000319f920 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:327 [inline] rcu_read_lock include/linux/rcupdate.h:839 [inline] get_mem_cgroup_from_objcg+0x36/0x150 include/linux/memcontrol.h:533 obj_cgroup_uncharge_pages mm/memcontrol.c:3392 [inline] __memcg_kmem_uncharge_page+0xf5/0x310 mm/memcontrol.c:3468 memcg_kmem_uncharge_page include/linux/memcontrol.h:1818 [inline] exit_task_stack_account+0xd7/0x340 kernel/fork.c:564 do_exit+0x1d02/0x27f0 kernel/exit.c:918 do_group_exit+0x207/0x2c0 kernel/exit.c:1026 get_signal+0x16a1/0x1740 kernel/signal.c:2917 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3b96575b59 Code: Unable to access opcode bytes at 0x7f3b96575b2f. RSP: 002b:00007f3b973cb0f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f3b96705f68 RCX: 00007f3b96575b59 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f3b96705f68 RBP: 00007f3b96705f60 R08: 00007f3b973cb6c0 R09: 00007f3b973cb6c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3b96705f6c R13: 000000000000000b R14: 00007ffd55a3d740 R15: 00007ffd55a3d828 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__cpu_map_flush+0x42/0xd0 Code: e8 93 d9 d6 ff 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 bd ce 39 00 49 8b 1e 4c 39 f3 74 77 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 9f ce 39 00 4c 8b 23 48 8d 7b c0 RSP: 0018:ffffc90000a18b10 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88806b371e00 RDX: 0000000080000100 RSI: 0000000000000010 RDI: ffffc9000319f800 RBP: dffffc0000000000 R08: ffffffff895fbdfa R09: 1ffffffff1f5d135 R10: dffffc0000000000 R11: fffffbfff1f5d136 R12: ffffc9000319f800 R13: ffffc9000319f820 R14: ffffc9000319f800 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3b96706030 CR3: 000000000e134000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: e8 93 d9 d6 ff call 0xffd6d998 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 bd ce 39 00 call 0x39ced8 1b: 49 8b 1e mov (%r14),%rbx 1e: 4c 39 f3 cmp %r14,%rbx 21: 74 77 je 0x9a 23: 48 89 d8 mov %rbx,%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: 48 89 df mov %rbx,%rdi 34: e8 9f ce 39 00 call 0x39ced8 39: 4c 8b 23 mov (%rbx),%r12 3c: 48 8d 7b c0 lea -0x40(%rbx),%rdi Tested on: commit: 2c9b3512 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=103762e6980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f4925140c45a2a50 dashboard link: https://syzkaller.appspot.com/bug?extid=707d98c8649695eaf329 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=123c8cad980000
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