channel 2 len 10 sock ffff888055d122c0 sk ffff88802d42e000 channel 2 len 10 vgaarb: vga_arb_release ================================================================== BUG: KASAN: slab-use-after-free in dev_name include/linux/device.h:934 [inline] BUG: KASAN: slab-use-after-free in __dynamic_dev_dbg+0x2fc/0x310 lib/dynamic_debug.c:904 Read of size 8 at addr ffff888024d6e120 by task syz.3.134/6516 CPU: 0 UID: 0 PID: 6516 Comm: syz.3.134 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 dev_name include/linux/device.h:934 [inline] __dynamic_dev_dbg+0x2fc/0x310 lib/dynamic_debug.c:904 vga_arb_release+0x3e7/0x540 drivers/pci/vgaarb.c:1439 __fput+0x3fb/0xb50 fs/file_table.c:512 fput_close_sync+0x118/0x250 fs/file_table.c:618 filp_close_sync+0x75/0xa0 fs/open.c:1573 close_files fs/file.c:572 [inline] put_files_struct fs/file.c:584 [inline] put_files_struct+0x1f7/0x390 fs/file.c:581 switch_files_struct fs/file.c:598 [inline] exit_files+0x85/0xb0 fs/file.c:604 do_exit+0x896/0x2a00 kernel/exit.c:977 do_group_exit+0xd5/0x2a0 kernel/exit.c:1123 get_signal+0x1ebd/0x21d0 kernel/signal.c:3112 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x139/0x700 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x661/0x790 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f143735fd8e Code: Unable to access opcode bytes at 0x7f143735fd64. RSP: 002b:00007f1438191f58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6 RAX: fffffffffffffdfc RBX: 00007f14381926c0 RCX: 00007f143735fd8e RDX: 00007f1438191fb0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f1437436b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1437626128 R14: 00007f1437626090 R15: 00007ffebcd3fea8 Allocated by task 166: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5531 [inline] __kmalloc_node_track_caller_noprof+0x33d/0x870 mm/slub.c:5662 kmalloc_reserve+0xe8/0x350 net/core/skbuff.c:638 __alloc_skb+0x185/0x710 net/core/skbuff.c:716 alloc_skb include/linux/skbuff.h:1390 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:744 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:801 [inline] nsim_dev_trap_report_work+0x2af/0xd20 drivers/net/netdevsim/dev.c:847 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3495 process_scheduled_works kernel/workqueue.c:3578 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3659 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 166: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2780 [inline] slab_free mm/slub.c:6630 [inline] kfree+0x22b/0x6d0 mm/slub.c:6923 skb_kfree_head net/core/skbuff.c:1084 [inline] skb_free_head+0xb9/0x160 net/core/skbuff.c:1096 skb_release_data+0x698/0x860 net/core/skbuff.c:1124 skb_release_all net/core/skbuff.c:1188 [inline] __kfree_skb net/core/skbuff.c:1202 [inline] consume_skb net/core/skbuff.c:1439 [inline] consume_skb+0xc4/0x110 net/core/skbuff.c:1433 nsim_dev_trap_report drivers/net/netdevsim/dev.c:817 [inline] nsim_dev_trap_report_work+0x8de/0xd20 drivers/net/netdevsim/dev.c:847 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3495 process_scheduled_works kernel/workqueue.c:3578 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3659 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 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 ffff888024d6e000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 288 bytes inside of freed 4096-byte region [ffff888024d6e000, ffff888024d6f000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24d68 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 ffff88801d443040 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801d443040 dead000000000100 dead000000000122 head: 0000000000000000 0000000000040004 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 1, tgid 1 (swapper/0), ts 3042882616 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1854 prep_new_page mm/page_alloc.c:1862 [inline] get_page_from_freelist+0x1113/0x35e0 mm/page_alloc.c:3933 __alloc_frozen_pages_noprof+0x2f6/0x3190 mm/page_alloc.c:5429 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab mm/slub.c:3499 [inline] new_slab+0xb1/0x6d0 mm/slub.c:3550 refill_objects+0xe3/0x410 mm/slub.c:7539 refill_sheaf mm/slub.c:2917 [inline] __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4811 alloc_from_pcs mm/slub.c:4887 [inline] slab_alloc_node mm/slub.c:5021 [inline] __kmalloc_cache_noprof+0x4ef/0x6d0 mm/slub.c:5676 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] pci_alloc_dev+0x47/0x270 drivers/pci/probe.c:2511 pci_scan_device drivers/pci/probe.c:2612 [inline] pci_scan_single_device drivers/pci/probe.c:2797 [inline] pci_scan_single_device+0x10c/0x240 drivers/pci/probe.c:2787 pci_scan_slot+0x1c9/0x7c0 drivers/pci/probe.c:2884 pci_scan_child_bus_extend+0x6b/0x7b0 drivers/pci/probe.c:3103 acpi_pci_root_create.cold+0x551/0x697 drivers/acpi/pci_root.c:1097 pci_acpi_scan_root+0x4a9/0x5c0 arch/x86/pci/acpi.c:574 acpi_pci_root_add.cold+0x91e/0x16ed drivers/acpi/pci_root.c:723 acpi_scan_attach_handler drivers/acpi/scan.c:2325 [inline] acpi_bus_attach+0x7b2/0xbd0 drivers/acpi/scan.c:2386 acpi_dev_for_one_check drivers/acpi/bus.c:1156 [inline] acpi_dev_for_one_check+0x97/0xd0 drivers/acpi/bus.c:1149 page_owner free stack trace missing Memory state around the buggy address: ffff888024d6e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024d6e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888024d6e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888024d6e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024d6e200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================