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2002:a4a:ee0a:0:b0:67b:a1df:2079 with SMTP id 006d021491bc7-67bc88e6714mr266025eaf.31.1773182357456; Tue, 10 Mar 2026 15:39:17 -0700 (PDT) Date: Tue, 10 Mar 2026 15:39:17 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69b09d95.a00a0220.3a1cd4.0000.GAE@google.com> Subject: Re: Mensagem particular referente a: [syzbot] [sound?] KASAN: slab-use-after-free Read in snd_pcm_post_stop From: syzbot To: cassiogabrielcontato@gmail.com Cc: cassiogabrielcontato@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable > Testing against the latest release. > > #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.= git=20 > master > > Em ter=C3=A7a-feira, 20 de janeiro de 2026 =C3=A0s 17:09:34 UTC-3, syzbot= escreveu: > > Hello,=20 > > syzbot found the following issue on:=20 > > HEAD commit: e84d960149e7 Merge tag 'for-6.19-rc5-tag' of git://git.ker..= =20 > git tree: upstream=20 > console output: https://syzkaller.appspot.com/x/log.txt?x=3D1527752258000= 0=20 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D7b058fb1d7dbe6= b1=20 > dashboard link: https://syzkaller.appspot.com/bug?extid=3D16b2b67ae905feb= 8a289=20 > compiler: Debian clang version 20.1.8=20 > (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD=20 > 20.1.8=20 > > Unfortunately, I don't have any reproducer for this issue yet.=20 > > Downloadable assets:=20 > disk image:=20 > https://storage.googleapis.com/syzbot-assets/09af5f7a987e/disk-e84d9601.r= aw.xz=20 > vmlinux:=20 > https://storage.googleapis.com/syzbot-assets/9b42fe73e088/vmlinux-e84d960= 1.xz=20 > kernel image:=20 > https://storage.googleapis.com/syzbot-assets/37e4d5c70177/bzImage-e84d960= 1.xz=20 > > IMPORTANT: if you fix the issue, please add the following tag to the=20 > commit:=20 > Reported-by: syzbot+16b2b6...@syzkaller.appspotmail.com=20 > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20 > BUG: KASAN: slab-use-after-free in rt_spin_lock+0x88/0x3e0=20 > kernel/locking/spinlock_rt.c:56=20 > Read of size 1 at addr ffff88802fee8170 by task syz.0.79/6271=20 > > CPU: 1 UID: 0 PID: 6271 Comm: syz.0.79 Not tainted syzkaller #0=20 > PREEMPT_{RT,(full)}=20 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS= =20 > Google 10/25/2025=20 > Call Trace:=20 > =20 > dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120=20 > print_address_description mm/kasan/report.c:378 [inline]=20 > print_report+0xca/0x240 mm/kasan/report.c:482=20 > kasan_report+0x118/0x150 mm/kasan/report.c:595=20 > __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574=20 > kasan_check_byte include/linux/kasan.h:402 [inline]=20 > lock_acquire+0x84/0x340 kernel/locking/lockdep.c:5842=20 > rt_spin_lock+0x88/0x3e0 kernel/locking/spinlock_rt.c:56=20 > spin_lock include/linux/spinlock_rt.h:44 [inline]=20 > __wake_up_common_lock+0x2f/0x1e0 kernel/sched/wait.c:124=20 > snd_pcm_post_stop+0x14a/0x1e0 sound/core/pcm_native.c:1550=20 > snd_pcm_action_single sound/core/pcm_native.c:-1 [inline]=20 > snd_pcm_action+0x1f4/0x240 sound/core/pcm_native.c:1398=20 > loopback_check_format sound/drivers/aloop.c:363 [inline]=20 > loopback_trigger+0xb82/0x1b60 sound/drivers/aloop.c:411=20 > snd_pcm_do_start+0xb7/0x180 sound/core/pcm_native.c:1459=20 > snd_pcm_action_single sound/core/pcm_native.c:1315 [inline]=20 > snd_pcm_action+0xe7/0x240 sound/core/pcm_native.c:1398=20 > __snd_pcm_lib_xfer+0x1762/0x1d00 sound/core/pcm_lib.c:2405=20 > snd_pcm_oss_write3+0x1bc/0x350 sound/core/oss/pcm_oss.c:1243=20 > snd_pcm_plug_write_transfer+0x2cb/0x4c0 sound/core/oss/pcm_plugin.c:630= =20 > snd_pcm_oss_write2 sound/core/oss/pcm_oss.c:1375 [inline]=20 > snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1441 [inline]=20 > snd_pcm_oss_write+0xa31/0xf20 sound/core/oss/pcm_oss.c:2796=20 > vfs_write+0x287/0xb40 fs/read_write.c:684=20 > ksys_write+0x14b/0x260 fs/read_write.c:738=20 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]=20 > do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94=20 > entry_SYSCALL_64_after_hwframe+0x77/0x7f=20 > RIP: 0033:0x7f0e7667f749=20 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f= 7=20 > 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff= =20 > ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48=20 > RSP: 002b:00007f0e748a4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001=20 > RAX: ffffffffffffffda RBX: 00007f0e768d6180 RCX: 00007f0e7667f749=20 > RDX: 0000000000004000 RSI: 00002000000012c0 RDI: 0000000000000007=20 > RBP: 00007f0e76703f91 R08: 0000000000000000 R09: 0000000000000000=20 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000=20 > R13: 00007f0e768d6218 R14: 00007f0e768d6180 R15: 00007ffe1e187e28=20 > =20 > > Allocated by task 6270:=20 > kasan_save_stack mm/kasan/common.c:57 [inline]=20 > kasan_save_track+0x3e/0x80 mm/kasan/common.c:78=20 > poison_kmalloc_redzone mm/kasan/common.c:398 [inline]=20 > __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415=20 > kasan_kmalloc include/linux/kasan.h:263 [inline]=20 > __kmalloc_cache_noprof+0x1fb/0x6d0 mm/slub.c:5776=20 > kmalloc_noprof include/linux/slab.h:957 [inline]=20 > kzalloc_noprof include/linux/slab.h:1094 [inline]=20 > snd_pcm_attach_substream+0x5b7/0xb30 sound/core/pcm.c:938=20 > snd_pcm_open_substream+0xb6/0x2410 sound/core/pcm_native.c:2761=20 > snd_pcm_oss_open_file sound/core/oss/pcm_oss.c:2439 [inline]=20 > snd_pcm_oss_open+0xf2a/0x1bd0 sound/core/oss/pcm_oss.c:2520=20 > chrdev_open+0x4cf/0x5e0 fs/char_dev.c:414=20 > do_dentry_open+0x7d0/0x1270 fs/open.c:962=20 > vfs_open+0x3b/0x350 fs/open.c:1094=20 > do_open fs/namei.c:4637 [inline]=20 > path_openat+0x342a/0x3df0 fs/namei.c:4796=20 > do_filp_open+0x1fa/0x410 fs/namei.c:4823=20 > do_sys_openat2+0x121/0x200 fs/open.c:1430=20 > do_sys_open fs/open.c:1436 [inline]=20 > __do_sys_openat fs/open.c:1452 [inline]=20 > __se_sys_openat fs/open.c:1447 [inline]=20 > __x64_sys_openat+0x138/0x170 fs/open.c:1447=20 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]=20 > do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94=20 > entry_SYSCALL_64_after_hwframe+0x77/0x7f=20 > > Freed by task 6268:=20 > kasan_save_stack mm/kasan/common.c:57 [inline]=20 > kasan_save_track+0x3e/0x80 mm/kasan/common.c:78=20 > kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584=20 > poison_slab_object mm/kasan/common.c:253 [inline]=20 > __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285=20 > kasan_slab_free include/linux/kasan.h:235 [inline]=20 > slab_free_hook mm/slub.c:2540 [inline]=20 > slab_free mm/slub.c:6670 [inline]=20 > kfree+0x1bd/0x900 mm/slub.c:6878=20 > snd_pcm_detach_substream+0x1e1/0x290 sound/core/pcm.c:1003=20 > snd_pcm_oss_release_file sound/core/oss/pcm_oss.c:2398 [inline]=20 > snd_pcm_oss_release+0x184/0x250 sound/core/oss/pcm_oss.c:2577=20 > __fput+0x45b/0xa80 fs/file_table.c:468=20 > task_work_run+0x1d4/0x260 kernel/task_work.c:233=20 > resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]=20 > __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]=20 > exit_to_user_mode_loop+0xef/0x4e0 kernel/entry/common.c:75=20 > __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]= =20 > syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256=20 > [inline]=20 > syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]= =20 > syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]=20 > do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100=20 > entry_SYSCALL_64_after_hwframe+0x77/0x7f=20 > > The buggy address belongs to the object at ffff88802fee8000=20 > which belongs to the cache kmalloc-2k of size 2048=20 > The buggy address is located 368 bytes inside of=20 > freed 2048-byte region [ffff88802fee8000, ffff88802fee8800)=20 > > The buggy address belongs to the physical page:=20 > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2fee= 8=20 > head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0= =20 > flags: 0x80000000000040(head|node=3D0|zone=3D1)=20 > page_type: f5(slab)=20 > raw: 0080000000000040 ffff88813ff27000 dead000000000100 dead000000000122= =20 > raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000= =20 > head: 0080000000000040 ffff88813ff27000 dead000000000100 dead000000000122= =20 > head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000= =20 > head: 0080000000000003 ffffea0000bfba01 00000000ffffffff 00000000ffffffff= =20 > head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008= =20 > page dumped because: kasan: bad access detected=20 > page_owner tracks the page as allocated=20 > page last allocated via order 3, migratetype Unmovable, gfp_mask=20 > 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOM= EMALLOC),=20 > pid 12, tgid 12 (kworker/u8:0), ts 112751171195, free_ts 112474179646=20 > set_page_owner include/linux/page_owner.h:32 [inline]=20 > post_alloc_hook+0x234/0x290 mm/page_alloc.c:1884=20 > prep_new_page mm/page_alloc.c:1892 [inline]=20 > get_page_from_freelist+0x28c0/0x2960 mm/page_alloc.c:3945=20 > __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5240=20 > alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2486=20 > alloc_slab_page mm/slub.c:3075 [inline]=20 > allocate_slab+0x86/0x3b0 mm/slub.c:3248=20 > new_slab mm/slub.c:3302 [inline]=20 > ___slab_alloc+0xb10/0x13e0 mm/slub.c:4656=20 > __slab_alloc+0xc6/0x1f0 mm/slub.c:4779=20 > __slab_alloc_node mm/slub.c:4855 [inline]=20 > slab_alloc_node mm/slub.c:5251 [inline]=20 > __do_kmalloc_node mm/slub.c:5656 [inline]=20 > __kmalloc_node_track_caller_noprof+0x2bf/0x810 mm/slub.c:5764=20 > kmalloc_reserve+0x136/0x290 net/core/skbuff.c:608=20 > __alloc_skb+0x204/0x3a0 net/core/skbuff.c:690=20 > alloc_skb include/linux/skbuff.h:1383 [inline]=20 > mld_newpack+0x13c/0xc40 net/ipv6/mcast.c:1775=20 > add_grhead+0x5a/0x2a0 net/ipv6/mcast.c:1886=20 > add_grec+0x1452/0x1740 net/ipv6/mcast.c:2025=20 > mld_send_initial_cr+0x288/0x550 net/ipv6/mcast.c:2268=20 > ipv6_mc_dad_complete+0x88/0x410 net/ipv6/mcast.c:2279=20 > addrconf_dad_completed+0x58d/0xd70 net/ipv6/addrconf.c:4340=20 > page last free pid 5166 tgid 5166 stack trace:=20 > reset_page_owner include/linux/page_owner.h:25 [inline]=20 > free_pages_prepare mm/page_alloc.c:1433 [inline]=20 > __free_frozen_pages+0xfe1/0x1170 mm/page_alloc.c:2973=20 > discard_slab mm/slub.c:3346 [inline]=20 > __put_partials+0x149/0x170 mm/slub.c:3886=20 > __slab_free+0x2af/0x330 mm/slub.c:5952=20 > qlink_free mm/kasan/quarantine.c:163 [inline]=20 > qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179=20 > kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286=20 > __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350=20 > kasan_slab_alloc include/linux/kasan.h:253 [inline]=20 > slab_post_alloc_hook mm/slub.c:4953 [inline]=20 > slab_alloc_node mm/slub.c:5263 [inline]=20 > __do_kmalloc_node mm/slub.c:5656 [inline]=20 > __kvmalloc_node_noprof+0x3b4/0x940 mm/slub.c:7136=20 > seq_buf_alloc fs/seq_file.c:38 [inline]=20 > seq_read_iter+0x203/0xe20 fs/seq_file.c:210=20 > new_sync_read fs/read_write.c:491 [inline]=20 > vfs_read+0x563/0xa30 fs/read_write.c:572=20 > ksys_read+0x14b/0x260 fs/read_write.c:715=20 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]=20 > do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94=20 > entry_SYSCALL_64_after_hwframe+0x77/0x7f=20 > > Memory state around the buggy address:=20 > ffff88802fee8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb=20 > ffff88802fee8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb=20 >>ffff88802fee8100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb=20 > ^=20 > ffff88802fee8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb=20 > ffff88802fee8200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb=20 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=20 > > > ---=20 > This report is generated by a bot. It may contain errors.=20 > See https://goo.gl/tpsmEJ for more information about syzbot.=20 > syzbot engineers can be reached at syzk...@googlegroups.com.=20 > > syzbot will keep track of this issue. See:=20 > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.=20 > > If the report is already addressed, let syzbot know by replying with:=20 > #syz fix: exact-commit-title=20 > > If you want to overwrite report's subsystems, reply with:=20 > #syz set subsystems: new-subsystem=20 > (See the list of subsystem names on the web dashboard)=20 > > If the report is a duplicate of another one, reply with:=20 > #syz dup: exact-subject-of-another-report=20 > > If you want to undo deduplication, reply with:=20 > #syz undup=20 > Command #1: This crash does not have a reproducer. I cannot test it.