From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f205.google.com (mail-il1-f205.google.com [209.85.166.205]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E2F352E7BA0 for ; Thu, 25 Sep 2025 18:49:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758826170; cv=none; b=eBkliZHTIFeKTWoWGr4RdU/C3BIORertGFK4x5LC9bDUYFyrUXdPMbPm5fDU5f0pjy/Ut/OyhgeDX0gHLX5xfMGxyfE84PXb22OLzvDiZsTK/Vklx+lb0CjzdR1pA/2Mf3XePakw46qZqbUU/rwG6RFOAMaRNZ1JSSGVdylhvAQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758826170; c=relaxed/simple; bh=GNBT5bxOPbYG7lfhIrDOKnvIqVevRRFFY+5USWYSQKE=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=estOxJTblrKHyIvbjtfdjqw2sY8XjABbxc9U1OSKIzkRYUsb2vLB0Wn52XNjqVp0x+P5ODmZuMRsJlPydYP5Gz/xXduJ70aBX7s6wQlVRvYl9fTLMmVSc550zoOQE8g/RvhznsTD1Y/SnuovTjBQW4tuhIRylBqLNy/6c+teIsg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.205 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f205.google.com with SMTP id e9e14a558f8ab-4258a5580edso28031225ab.1 for ; Thu, 25 Sep 2025 11:49:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758826168; x=1759430968; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=s6B/MGcmvTIVY5UDk7ftWA8f+bRgVB4t+i6Z17NI/uc=; b=cyVdVMSqj2liMGTr4rhwvhxbI2+ParILbC7LlODCx2FEibU/2ARNccT7z1BcdvLSoq YDdMsJ9NEUvtHxOoNPMbtqlA2TwGEltSiCz7VaU92CVbLAJnELUOAIYzulkdqLBGQ5+H No7iXbVSlOItBpFcC1lDDvdXcxQy6QUDbfTaDsswKf9UHP5rheRljWsslIKOqxdRJVhJ Nyrx/tKF4Dbb7xb9Vszbg6V0YTrGHQDAqBg/qbCRJeMXJNbCwMok/MpwwmThj6Lbr0s3 OEhTV6J/KVxF8KgAtdfkQp4ZSJuVRNcEt4wukfWqr6aETxj6DTXg4GQck+0Q3A9Lu+6S JE1A== X-Forwarded-Encrypted: i=1; AJvYcCXrpdhutSf3fDLLnFSdXTCbJ4xD3GUuWLmj7i2zhcY30/U4f0AkDnyINAM7AuJMY9EDjq6M4IM=@vger.kernel.org X-Gm-Message-State: AOJu0Yxi1tPt4OoUNOtd5lWKnP5h3yLqZRPiGSALyfr27z+ANpOtwK8c nSuM5CTau9Fmsgfvc4jNFwJPaiOop8iltVt5pMKcGjc8aqQZYJ0zHxAU6Sn9ITzf+O4CbOcLcS8 5mIg93wf6alTnMct0dB6LZPf0yEBAqXuslMO9rhSnU3UnuxF1pKC6E2wzFXs= X-Google-Smtp-Source: AGHT+IFYCSH1x2qSqy2wdt+Q79kdzAnEPfb/WCccGxR6GmIECzsSfHiPQOnkcjuG+9JbwaSknSzNnCTDfz+NPQkFiI1mGeHUV+eJ Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:349c:b0:425:86d9:91ea with SMTP id e9e14a558f8ab-425c292e916mr50483355ab.11.1758826168076; Thu, 25 Sep 2025 11:49:28 -0700 (PDT) Date: Thu, 25 Sep 2025 11:49:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68d58eb8.050a0220.25d7ab.005b.GAE@google.com> Subject: [syzbot] [hams?] KASAN: slab-use-after-free Write in rose_t0timer_expiry From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-hams@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: e8442d5b7bc6 Merge tag 'sound-6.17-rc7' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1444b0e2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8f01d8629880e620 dashboard link: https://syzkaller.appspot.com/bug?extid=350060a9356421ae83dc compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a710a41115b6/disk-e8442d5b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cf50d7099eff/vmlinux-e8442d5b.xz kernel image: https://storage.googleapis.com/syzbot-assets/48cf00216bb5/bzImage-e8442d5b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+350060a9356421ae83dc@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in rose_t0timer_expiry+0x114/0x150 net/rose/rose_link.c:85 Write of size 1 at addr ffff8880569e3435 by task syz.3.1212/10695 CPU: 0 UID: 0 PID: 10695 Comm: syz.3.1212 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 rose_t0timer_expiry+0x114/0x150 net/rose/rose_link.c:85 call_timer_fn+0x197/0x620 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers+0x6ef/0x960 kernel/time/timer.c:2372 __run_timer_base kernel/time/timer.c:2384 [inline] __run_timer_base kernel/time/timer.c:2376 [inline] run_timer_base+0x114/0x190 kernel/time/timer.c:2393 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_release+0x183/0x2f0 kernel/locking/lockdep.c:5893 Code: 0f c1 05 f8 4d 3f 12 83 f8 01 0f 85 1d 01 00 00 9c 58 f6 c4 02 0f 85 08 01 00 00 41 f7 c5 00 02 00 00 74 01 fb 48 8b 44 24 10 <65> 48 2b 05 0d 0c 3f 12 0f 85 58 01 00 00 48 83 c4 18 5b 41 5c 41 RSP: 0018:ffffc9000458eef0 EFLAGS: 00000206 RAX: 6a3b0bf03f2b6b00 RBX: ffffffff8e5c15a0 RCX: ffffc9000458eefc RDX: 0000000000000000 RSI: ffffffff8de2d7a0 RDI: ffffffff8c163380 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000006b1a R12: ffffffff816af8a4 R13: 0000000000000202 R14: ffff888079510000 R15: 0000000000000001 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] class_rcu_destructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0x3f9/0x20a0 arch/x86/kernel/unwind_orc.c:479 __unwind_start+0x45f/0x7f0 arch/x86/kernel/unwind_orc.c:758 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0x73/0x100 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 save_stack+0x160/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x84/0x1a0 mm/page_owner.c:308 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952 folios_put_refs+0x56f/0x740 mm/swap.c:999 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x58f/0x1150 mm/shmem.c:1157 shmem_truncate_range mm/shmem.c:1269 [inline] shmem_evict_inode+0x3a1/0xbe0 mm/shmem.c:1397 evict+0x3e3/0x920 fs/inode.c:810 iput_final fs/inode.c:1897 [inline] iput fs/inode.c:1923 [inline] iput+0x521/0x880 fs/inode.c:1909 dentry_unlink_inode+0x29c/0x480 fs/dcache.c:466 __dentry_kill+0x1d0/0x600 fs/dcache.c:669 dput.part.0+0x4b1/0x9b0 fs/dcache.c:911 dput+0x1f/0x30 fs/dcache.c:901 __fput+0x51c/0xb70 fs/file_table.c:476 task_work_run+0x150/0x240 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x86f/0x2bf0 kernel/exit.c:961 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102 get_signal+0x2673/0x26d0 kernel/signal.c:3034 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x41c/0x4e0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6ae558ec29 Code: Unable to access opcode bytes at 0x7f6ae558ebff. RSP: 002b:00007f6ae6354038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: 0000000000010106 RBX: 00007f6ae57d6090 RCX: 00007f6ae558ec29 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007f6ae5611e41 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6ae57d6128 R14: 00007f6ae57d6090 R15: 00007ffc44639248 Allocated by task 7892: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405 kmalloc_noprof include/linux/slab.h:905 [inline] rose_add_node net/rose/rose_route.c:85 [inline] rose_rt_ioctl+0x880/0x2580 net/rose/rose_route.c:748 rose_ioctl+0x64d/0x7d0 net/rose/af_rose.c:1381 sock_do_ioctl+0x118/0x280 net/socket.c:1238 sock_ioctl+0x227/0x6b0 net/socket.c:1359 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 10720: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x60/0x70 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+0x2b4/0x4d0 mm/slub.c:4894 rose_neigh_put include/net/rose.h:166 [inline] rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183 call_timer_fn+0x197/0x620 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers+0x6ef/0x960 kernel/time/timer.c:2372 __run_timer_base kernel/time/timer.c:2384 [inline] __run_timer_base kernel/time/timer.c:2376 [inline] run_timer_base+0x114/0x190 kernel/time/timer.c:2393 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 The buggy address belongs to the object at ffff8880569e3400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 53 bytes inside of freed 512-byte region [ffff8880569e3400, ffff8880569e3600) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x569e0 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b841c80 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b841c80 0000000000000000 dead000000000001 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea00015a7801 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 5844, tgid 5844 (syz-executor), ts 66287574491, free_ts 15197057508 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2492 [inline] allocate_slab mm/slub.c:2660 [inline] new_slab+0x247/0x330 mm/slub.c:2714 ___slab_alloc+0xcf2/0x1750 mm/slub.c:3901 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3992 __slab_alloc_node mm/slub.c:4067 [inline] slab_alloc_node mm/slub.c:4228 [inline] __kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4402 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] mca_alloc net/ipv6/mcast.c:876 [inline] __ipv6_dev_mc_inc+0x2f1/0xbc0 net/ipv6/mcast.c:966 br_ip6_multicast_join_snoopers net/bridge/br_multicast.c:4183 [inline] br_multicast_join_snoopers+0xcb/0x120 net/bridge/br_multicast.c:4194 br_dev_open+0x112/0x150 net/bridge/br_device.c:174 __dev_open+0x2e7/0x7c0 net/core/dev.c:1682 __dev_change_flags+0x55d/0x720 net/core/dev.c:9549 netif_change_flags+0x8d/0x160 net/core/dev.c:9612 do_setlink.constprop.0+0xb53/0x4380 net/core/rtnetlink.c:3143 rtnl_changelink net/core/rtnetlink.c:3761 [inline] __rtnl_newlink net/core/rtnetlink.c:3920 [inline] rtnl_newlink+0x1446/0x2000 net/core/rtnetlink.c:4057 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0x7d5/0x10f0 mm/page_alloc.c:2895 __free_pages mm/page_alloc.c:5260 [inline] free_contig_range+0x183/0x4b0 mm/page_alloc.c:7091 destroy_args+0x794/0xc10 mm/debug_vm_pgtable.c:958 debug_vm_pgtable+0x1a32/0x3640 mm/debug_vm_pgtable.c:1345 do_one_initcall+0x120/0x6e0 init/main.c:1269 do_initcall_level init/main.c:1331 [inline] do_initcalls init/main.c:1347 [inline] do_basic_setup init/main.c:1366 [inline] kernel_init_freeable+0x5c2/0x910 init/main.c:1579 kernel_init+0x1c/0x2b0 init/main.c:1469 ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff8880569e3300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880569e3380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880569e3400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880569e3480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880569e3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 0f c1 05 f8 4d 3f 12 xadd %eax,0x123f4df8(%rip) # 0x123f4dff 7: 83 f8 01 cmp $0x1,%eax a: 0f 85 1d 01 00 00 jne 0x12d 10: 9c pushf 11: 58 pop %rax 12: f6 c4 02 test $0x2,%ah 15: 0f 85 08 01 00 00 jne 0x123 1b: 41 f7 c5 00 02 00 00 test $0x200,%r13d 22: 74 01 je 0x25 24: fb sti 25: 48 8b 44 24 10 mov 0x10(%rsp),%rax * 2a: 65 48 2b 05 0d 0c 3f sub %gs:0x123f0c0d(%rip),%rax # 0x123f0c3f <-- trapping instruction 31: 12 32: 0f 85 58 01 00 00 jne 0x190 38: 48 83 c4 18 add $0x18,%rsp 3c: 5b pop %rbx 3d: 41 5c pop %r12 3f: 41 rex.B --- 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@googlegroups.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 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