attempt to access beyond end of device loop8: rw=0, want=24, limit=16 ================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_dec include/linux/atomic/atomic-instrumented.h:244 [inline] BUG: KASAN: use-after-free in gfs2_qd_dispose fs/gfs2/quota.c:137 [inline] BUG: KASAN: use-after-free in gfs2_qd_shrink_scan+0x61a/0x820 fs/gfs2/quota.c:175 Write of size 4 at addr ffff8880605b8a70 by task syz.8.422/7172 CPU: 1 PID: 7172 Comm: syz.8.422 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_dec include/linux/atomic/atomic-instrumented.h:244 [inline] gfs2_qd_dispose fs/gfs2/quota.c:137 [inline] gfs2_qd_shrink_scan+0x61a/0x820 fs/gfs2/quota.c:175 do_shrink_slab+0x510/0xd00 mm/vmscan.c:765 shrink_slab+0x1b1/0x770 mm/vmscan.c:925 drop_slab_node+0xf3/0x180 mm/vmscan.c:960 drop_slab+0x81/0x110 mm/vmscan.c:970 drop_caches_sysctl_handler+0xbe/0x160 fs/drop_caches.c:66 proc_sys_call_handler+0x458/0x6c0 fs/proc/proc_sysctl.c:588 do_iter_readv_writev+0x497/0x600 fs/read_write.c:-1 do_iter_write+0x205/0x7b0 fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_writev+0x254/0x410 fs/read_write.c:971 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f9826f67749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f98251ce038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f98271bdfa0 RCX: 00007f9826f67749 RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000004 RBP: 00007f9826febf91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f98271be038 R14: 00007f98271bdfa0 R15: 00007ffd149ae788 Allocated by task 4538: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] init_sbd fs/gfs2/ops_fstype.c:77 [inline] gfs2_fill_super+0x13f/0x1f50 fs/gfs2/ops_fstype.c:1151 get_tree_bdev+0x3f1/0x610 fs/super.c:1325 gfs2_get_tree+0x4d/0x1e0 fs/gfs2/ops_fstype.c:1332 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x24a/0xa40 fs/namespace.c:3034 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3562 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 4572: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1710 [inline] slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736 slab_free mm/slub.c:3504 [inline] kfree+0xef/0x2a0 mm/slub.c:4564 generic_shutdown_super+0x130/0x300 fs/super.c:475 kill_block_super+0x7c/0xe0 fs/super.c:1427 deactivate_locked_super+0x93/0xf0 fs/super.c:335 cleanup_mnt+0x418/0x4d0 fs/namespace.c:1148 task_work_run+0x125/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x61e/0x20a0 kernel/exit.c:883 do_group_exit+0x12e/0x300 kernel/exit.c:997 get_signal+0x6ca/0x12c0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff8880605b8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2672 bytes inside of 8192-byte region [ffff8880605b8000, ffff8880605ba000) The buggy address belongs to the page: page:ffffea0001816e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x605b8 head:ffffea0001816e00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888016842280 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 4252, ts 59923069566, free_ts 11930461293 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] __kmalloc+0x1cd/0x330 mm/slub.c:4408 kmalloc include/linux/slab.h:612 [inline] kzalloc include/linux/slab.h:738 [inline] sta_info_alloc+0x84/0x1d00 net/mac80211/sta_info.c:344 ieee80211_ibss_rx_no_sta+0x3e3/0x730 net/mac80211/ibss.c:1236 ieee80211_accept_frame net/mac80211/rx.c:4157 [inline] ieee80211_prepare_and_rx_handle+0x33ce/0x5250 net/mac80211/rx.c:4687 __ieee80211_rx_handle_packet net/mac80211/rx.c:4863 [inline] ieee80211_rx_list+0x1c01/0x2700 net/mac80211/rx.c:4990 ieee80211_rx_napi+0x15d/0x360 net/mac80211/rx.c:5013 ieee80211_rx include/net/mac80211.h:4573 [inline] ieee80211_handle_queued_frames+0x105/0x1b0 net/mac80211/main.c:237 tasklet_action_common+0x298/0x400 kernel/softirq.c:806 handle_softirqs+0x328/0x820 kernel/softirq.c:576 do_softirq+0x13b/0x200 kernel/softirq.c:477 __local_bh_enable_ip+0x174/0x1b0 kernel/softirq.c:401 rcu_read_unlock_bh include/linux/rcupdate.h:810 [inline] ip6_finish_output2+0x110b/0x1500 net/ipv6/ip6_output.c:131 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 free_contig_range+0x96/0xf0 mm/page_alloc.c:9406 destroy_args+0x100/0xa20 mm/debug_vm_pgtable.c:1018 debug_vm_pgtable+0x318/0x370 mm/debug_vm_pgtable.c:1336 do_one_initcall+0x1ee/0x680 init/main.c:1316 do_initcall_level+0x137/0x1f0 init/main.c:1389 do_initcalls+0x4b/0x90 init/main.c:1405 kernel_init_freeable+0x3ce/0x560 init/main.c:1629 kernel_init+0x19/0x1b0 init/main.c:1520 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff8880605b8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880605b8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880605b8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880605b8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880605b8b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================