================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:1375 [inline] BUG: KASAN: slab-use-after-free in gfs2_qd_dealloc+0x7a/0xf0 fs/gfs2/quota.c:115 Write of size 4 at addr ffff88801b0a8a78 by task ksoftirqd/3/31 CPU: 3 PID: 31 Comm: ksoftirqd/3 Not tainted 6.6.0-rc3-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0xef/0x190 mm/kasan/generic.c:187 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:1375 [inline] gfs2_qd_dealloc+0x7a/0xf0 fs/gfs2/quota.c:115 rcu_do_batch kernel/rcu/tree.c:2139 [inline] rcu_core+0x805/0x1bb0 kernel/rcu/tree.c:2403 __do_softirq+0x218/0x965 kernel/softirq.c:553 run_ksoftirqd kernel/softirq.c:921 [inline] run_ksoftirqd+0x31/0x60 kernel/softirq.c:913 smpboot_thread_fn+0x660/0xa00 kernel/smpboot.c:164 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Allocated by task 16533: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:599 [inline] kzalloc include/linux/slab.h:720 [inline] init_sbd fs/gfs2/ops_fstype.c:77 [inline] gfs2_fill_super+0x149/0x2e50 fs/gfs2/ops_fstype.c:1164 get_tree_bdev+0x3b5/0x650 fs/super.c:1577 gfs2_get_tree+0x4e/0x280 fs/gfs2/ops_fstype.c:1348 vfs_get_tree+0x8c/0x370 fs/super.c:1750 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5188: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x138/0x190 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] __cache_free mm/slab.c:3370 [inline] __do_kmem_cache_free mm/slab.c:3557 [inline] __kmem_cache_free+0xcc/0x2d0 mm/slab.c:3564 generic_shutdown_super+0x161/0x3c0 fs/super.c:693 kill_block_super+0x3b/0x70 fs/super.c:1646 gfs2_kill_sb+0x361/0x410 fs/gfs2/ops_fstype.c:1811 deactivate_locked_super+0x9a/0x170 fs/super.c:481 deactivate_super+0xde/0x100 fs/super.c:514 cleanup_mnt+0x222/0x3d0 fs/namespace.c:1254 task_work_run+0x14d/0x240 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x215/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88801b0a8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2680 bytes inside of freed 8192-byte region [ffff88801b0a8000, ffff88801b0aa000) The buggy address belongs to the physical page: page:ffffea00006c2a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1b0a8 head:ffffea00006c2a00 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0x1() raw: 00fff00000000840 ffff888012c40a00 ffffea0001659710 ffff888012c41b50 raw: 0000000000000000 ffff88801b0a8000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 15425, tgid 15406 (syz-executor.0), ts 375147989312, free_ts 372911118210 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1536 prep_new_page mm/page_alloc.c:1543 [inline] get_page_from_freelist+0xee0/0x2f20 mm/page_alloc.c:3170 __alloc_pages_slowpath.constprop.0+0x2dd/0x2360 mm/page_alloc.c:3960 __alloc_pages+0x411/0x4a0 mm/page_alloc.c:4439 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1356 [inline] cache_grow_begin+0x99/0x3a0 mm/slab.c:2550 cache_alloc_refill+0x294/0x3a0 mm/slab.c:2923 ____cache_alloc mm/slab.c:2999 [inline] ____cache_alloc mm/slab.c:2982 [inline] __do_cache_alloc mm/slab.c:3182 [inline] slab_alloc_node mm/slab.c:3230 [inline] __kmem_cache_alloc_node+0x3c5/0x470 mm/slab.c:3521 __do_kmalloc_node mm/slab_common.c:1022 [inline] __kmalloc+0x4f/0x100 mm/slab_common.c:1036 kmalloc include/linux/slab.h:603 [inline] kzalloc include/linux/slab.h:720 [inline] ops_init+0x16b/0x650 net/core/net_namespace.c:126 setup_net+0x422/0xa40 net/core/net_namespace.c:339 copy_net_ns+0x2fa/0x670 net/core/net_namespace.c:491 create_new_namespaces+0x3ea/0xb10 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:228 ksys_unshare+0x3da/0x930 kernel/fork.c:3435 __do_sys_unshare kernel/fork.c:3506 [inline] __se_sys_unshare kernel/fork.c:3504 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:3504 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1136 [inline] free_unref_page_prepare+0x476/0xa40 mm/page_alloc.c:2312 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2405 slab_destroy mm/slab.c:1608 [inline] slabs_destroy+0x85/0xc0 mm/slab.c:1628 cache_flusharray mm/slab.c:3341 [inline] ___cache_free+0x2b7/0x420 mm/slab.c:3404 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x4c/0x1b0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slab.c:3237 [inline] __kmem_cache_alloc_node+0x163/0x470 mm/slab.c:3521 kmalloc_node_trace+0x22/0xd0 mm/slab_common.c:1127 kmalloc_node include/linux/slab.h:615 [inline] kzalloc_node include/linux/slab.h:731 [inline] __get_vm_area_node+0xe1/0x3d0 mm/vmalloc.c:2588 get_vm_area_caller mm/vmalloc.c:2648 [inline] vmap+0x15a/0x340 mm/vmalloc.c:2917 drm_gem_shmem_vmap+0x3ee/0x750 drivers/gpu/drm/drm_gem_shmem_helper.c:340 drm_gem_vmap+0xc5/0x1b0 drivers/gpu/drm/drm_gem.c:1185 drm_gem_vmap_unlocked+0x4a/0xa0 drivers/gpu/drm/drm_gem.c:1215 drm_client_buffer_vmap+0x45/0xd0 drivers/gpu/drm/drm_client.c:352 drm_fbdev_generic_damage_blit drivers/gpu/drm/drm_fbdev_generic.c:200 [inline] drm_fbdev_generic_helper_fb_dirty+0x260/0xbb0 drivers/gpu/drm/drm_fbdev_generic.c:225 Memory state around the buggy address: ffff88801b0a8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801b0a8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801b0a8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801b0a8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801b0a8b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================