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linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, toke@toke.dk Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: slab-use-after-free Read in tasklet_action_common ================================================================== BUG: KASAN: slab-use-after-free in tasklet_action_common+0x103/0x490 kernel/softirq.c:954 Read of size 8 at addr ffff888032f6b158 by task ksoftirqd/1/23 CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 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 kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:finish_task_switch+0x413/0xc60 kernel/sched/core.c:5434 Code: 04 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 d7 61 56 0a e8 52 42 3a 00 fb 4c 8b 65 c8 <49> 8d bc 24 18 17 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 RSP: 0018:ffffc900001d7aa0 EFLAGS: 00000206 RAX: 00000000008dcaf3 RBX: ffff8880b873cbe0 RCX: 8000000000000001 RDX: 0000000000000000 RSI: ffffffff8e41c2b1 RDI: ffffffff8c6dca80 RBP: ffffc900001d7af0 R08: ffffffff907a75bf R09: 1ffffffff20f4eb7 R10: dffffc0000000000 R11: fffffbfff20f4eb8 R12: ffff88801e688000 R13: ffff88801e688000 R14: dffffc0000000000 R15: 1ffff110170e797c context_switch kernel/sched/core.c:5586 [inline] __schedule+0x17e5/0x5820 kernel/sched/core.c:7382 preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7561 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12 smpboot_thread_fn+0x6ac/0xb30 kernel/smpboot.c:161 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 Allocated by task 5675: 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+0x31c/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_usb.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 5675: 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:6509 [inline] kfree+0x1c5/0x650 mm/slub.c:6802 ath9k_htc_probe_device+0x11a9/0x2370 drivers/net/wireless/ath/ath9k/htc_drv_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_usb.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 ffff888032f6b000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 344 bytes inside of freed 2048-byte region [ffff888032f6b000, ffff888032f6b800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32f68 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) 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), pid 203, tgid 203 (kworker/u8:6), ts 127967665812 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:7418 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+0x543/0x720 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 ipv6_mc_dad_complete+0x87/0x410 net/ipv6/mcast.c:2316 addrconf_dad_completed+0x8af/0xe60 net/ipv6/addrconf.c:4376 addrconf_dad_work+0xcf8/0x15c0 net/ipv6/addrconf.c:-1 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 page last free pid 6268 tgid 6268 ts 124939507899 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962 __slab_free+0x274/0x2c0 mm/slub.c:5823 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5010 anon_vma_chain_alloc mm/rmap.c:142 [inline] __anon_vma_prepare+0xbe/0x4d0 mm/rmap.c:194 __vmf_anon_prepare mm/memory.c:3961 [inline] vmf_anon_prepare mm/internal.h:569 [inline] do_anonymous_page mm/memory.c:5478 [inline] do_pte_missing+0x2f18/0x34b0 mm/memory.c:4698 handle_pte_fault mm/memory.c:6558 [inline] __handle_mm_fault mm/memory.c:6707 [inline] handle_mm_fault+0x1a53/0x3750 mm/memory.c:6876 do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 Memory state around the buggy address: ffff888032f6b000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888032f6b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888032f6b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888032f6b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888032f6b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 00 00 add %al,(%rax) 2: 41 c7 84 24 20 0e 00 movl $0x0,0xe20(%r12) 9: 00 00 00 00 00 e: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 13: 49 83 c4 48 add $0x48,%r12 17: 4c 89 e7 mov %r12,%rdi 1a: e8 d7 61 56 0a call 0xa5661f6 1f: e8 52 42 3a 00 call 0x3a4276 24: fb sti 25: 4c 8b 65 c8 mov -0x38(%rbp),%r12 * 29: 49 8d bc 24 18 17 00 lea 0x1718(%r12),%rdi <-- trapping instruction 30: 00 31: 48 89 f8 mov %rdi,%rax 34: 48 c1 e8 03 shr $0x3,%rax 38: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax 3d: 84 c0 test %al,%al Tested on: commit: a804c574 Merge tag 'lsm-pr-20261016' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=104e4f01580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5a37d7227c6a6352 dashboard link: https://syzkaller.appspot.com/bug?extid=e91dc13b1b37759b3d9f compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 Note: no patches were applied.