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AKwUvByEV6KoP4cnrZVYKd1R4xODLPjPfLcE9j6RQusCYwK/GcMPIW6Yz4UIncWv5L5hYZktvf9YkCUO7Va9j0I=@vger.kernel.org X-Gm-Message-State: AFuF++kAjlrmnZLVoc0HV/BcMQaaII1NqyYlkmRiON9xZSgdf+l4NHLU dRYWL3z4SqQ7suFNczaMZOCdqJL7AZL1JtFbQMu2pmX50bYMRhJB4eP4bxJxqFfBVUc06up3zBQ 72p/aewOYZg7eX8LDCqOaI6qSj7PKjiMDKlMrp0jnzvcP2EadOsz2pfXhbX0= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:bc6:b0:490:315d:e0d5 with SMTP id 5614622812f47-4f529d201b4mr2601825b6e.16.1790961273269; Fri, 02 Oct 2026 10:14:33 -0700 (PDT) Date: Fri, 02 Oct 2026 10:14:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6abfe679.b50370da.302ea9.000d.GAE@google.com> Subject: [syzbot] [wireless?] KASAN: slab-use-after-free Read in tasklet_action_common From: syzbot To: jeff.johnson@oss.qualcomm.com, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org, toke@redhat.com, toke@toke.dk Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello, syzbot found the following issue on: HEAD commit: d24e8ac715de Merge tag 'net-7.3-rc6' of git://git.kernel.o.= . git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=3D14361b15580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3D9d4242cb1c54cdf= 7 dashboard link: https://syzkaller.appspot.com/bug?extid=3De91dc13b1b37759b3= d9f compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-= 1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D12361b1558000= 0 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D155bc725580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4ccd4fb94f0b/disk-= d24e8ac7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/701ac3e3f73b/vmlinux-= d24e8ac7.xz kernel image: https://storage.googleapis.com/syzbot-assets/976b7d839ef2/bzI= mage-d24e8ac7.xz The issue was bisected to: commit 1af8dc9ca726cf53767f9c0661171396f95c146a Author: Toke H=C3=B8iland-J=C3=B8rgensen Date: Tue Sep 8 17:05:18 2026 +0000 wifi: ath9k: Clean up device initialisation guards bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=3D145e5b155800= 00 final oops: https://syzkaller.appspot.com/x/report.txt?x=3D165e5b155800= 00 console output: https://syzkaller.appspot.com/x/log.txt?x=3D125e5b15580000 IMPORTANT: if you fix the issue, please add the following tag to the commit= : Reported-by: syzbot+e91dc13b1b37759b3d9f@syzkaller.appspotmail.com Fixes: 1af8dc9ca726 ("wifi: ath9k: Clean up device initialisation guards") =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 BUG: KASAN: slab-use-after-free in tasklet_action_common+0x103/0x490 kernel= /softirq.c:954 Read of size 8 at addr ffff888035947158 by task syz-executor/5756 CPU: 0 UID: 0 PID: 5756 Comm: syz-executor Not tainted syzkaller #0 PREEMPT= (full)=20 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Goo= gle 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 tasklet_action_common+0x103/0x490 kernel/softirq.c:954 handle_softirqs+0x226/0x860 kernel/softirq.c:645 do_softirq+0x77/0xd0 kernel/softirq.c:546 __local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473 spin_unlock_bh include/linux/spinlock.h:407 [inline] tun_flow_delete_by_queue drivers/net/tun.c:379 [inline] __tun_detach+0xccc/0x1900 drivers/net/tun.c:614 tun_detach drivers/net/tun.c:653 [inline] tun_chr_close+0x10a/0x1c0 drivers/net/tun.c:3587 __fput+0x418/0xa50 fs/file_table.c:512 task_work_run+0x1d9/0x270 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x73a/0x2360 kernel/exit.c:986 do_group_exit+0x22d/0x2f0 kernel/exit.c:1129 __do_sys_exit_group kernel/exit.c:1140 [inline] __se_sys_exit_group kernel/exit.c:1138 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1138 x64_sys_call+0x18c6/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:23= 2 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f558db9e159 Code: Unable to access opcode bytes at 0x7f558db9e12f. RSP: 002b:00007ffc01d96c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f558dc35fb3 RCX: 00007f558db9e159 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043 RBP: 00007f558dc35fc5 R08: 0000000000000000 R09: 00000000000927c0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006 R13: 00000000000927c0 R14: 0000000000015771 R15: 00007ffc01d96e10 Allocated by task 9: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x321/0x600 mm/slub.c:5563 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] ath9k_init_wmi+0x4f/0x2b0 drivers/net/wireless/ath/ath9k/wmi.c:95 ath9k_htc_probe_device+0x1e5/0x2370 drivers/net/wireless/ath/ath9k/htc_drv= _init.c:956 ath9k_htc_hw_init+0x32/0x70 drivers/net/wireless/ath/ath9k/htc_hst.c:532 ath9k_hif_usb_firmware_cb+0x214/0x4b0 drivers/net/wireless/ath/ath9k/hif_u= sb.c:1255 request_firmware_work_func+0xf7/0x2d0 drivers/base/firmware_loader/main.c:= 1164 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 9: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6508 [inline] kfree+0x1c5/0x650 mm/slub.c:6801 ath9k_htc_probe_device+0x11a9/0x2370 drivers/net/wireless/ath/ath9k/htc_dr= v_init.c:978 ath9k_htc_hw_init+0x32/0x70 drivers/net/wireless/ath/ath9k/htc_hst.c:532 ath9k_hif_usb_firmware_cb+0x214/0x4b0 drivers/net/wireless/ath/ath9k/hif_u= sb.c:1255 request_firmware_work_func+0xf7/0x2d0 drivers/base/firmware_loader/main.c:= 1164 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff888035947000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 344 bytes inside of freed 2048-byte region [ffff888035947000, ffff888035947800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x35940 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=3D0|zone=3D1|lastcpupid=3D0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b042000 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b042000 dead000000000100 dead000000000122 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__= GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pi= d 1225, tgid 1225 (kworker/0:2), ts 87487181723 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab+0x7d/0x620 mm/slub.c:3462 new_slab mm/slub.c:3513 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7417 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __do_kmalloc_node mm/slub.c:5413 [inline] __kmalloc_node_track_caller_noprof+0x548/0x720 mm/slub.c:5545 kmalloc_reserve net/core/skbuff.c:637 [inline] __alloc_skb+0x2c1/0x7a0 net/core/skbuff.c:715 alloc_skb include/linux/skbuff.h:1384 [inline] mld_newpack+0x165/0xcb0 net/ipv6/mcast.c:1810 add_grhead net/ipv6/mcast.c:1921 [inline] add_grec+0x119f/0x19d0 net/ipv6/mcast.c:2060 mld_send_initial_cr+0x288/0x550 net/ipv6/mcast.c:2305 mld_dad_work+0x3d/0x480 net/ipv6/mcast.c:2331 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 page last free pid 5650 tgid 5650 ts 85122206691 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] free_pages_prepare+0x9eb/0xaf0 mm/page_alloc.c:1463 __free_contig_range_common+0x174/0x340 mm/page_alloc.c:7072 __free_contig_range mm/page_alloc.c:7117 [inline] free_pages_bulk+0x48/0x120 mm/page_alloc.c:5322 vm_area_free_pages mm/vmalloc.c:3461 [inline] vfree+0x231/0x490 mm/vmalloc.c:3510 delayed_vfree_work+0x55/0x80 mm/vmalloc.c:3414 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888035947000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888035947080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888035947100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888035947180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888035947200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb =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 --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisectio= n 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