kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299 ================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:27 [inline] BUG: KASAN: use-after-free in get_pages fs/f2fs/f2fs.h:2446 [inline] BUG: KASAN: use-after-free in f2fs_write_end_io+0x8a2/0x990 fs/f2fs/data.c:369 Read of size 4 at addr ffff8881297e468c by task ksoftirqd/0/12 CPU: 0 PID: 12 Comm: ksoftirqd/0 Tainted: G W 5.10.209-syzkaller-00001-ge7daca75b4c3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189 __kasan_check_read+0x11/0x20 mm/kasan/shadow.c:31 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_read include/asm-generic/atomic-instrumented.h:27 [inline] get_pages fs/f2fs/f2fs.h:2446 [inline] f2fs_write_end_io+0x8a2/0x990 fs/f2fs/data.c:369 bio_endio+0x520/0x6a0 block/bio.c:1459 req_bio_endio block/blk-core.c:263 [inline] blk_update_request+0x6e9/0x12b0 block/blk-core.c:1468 blk_mq_end_request+0x43/0x80 block/blk-mq.c:569 lo_complete_rq+0x154/0x2f0 drivers/block/loop.c:490 blk_done_softirq+0x345/0x3d0 block/blk-mq.c:593 __do_softirq+0x268/0x5bb kernel/softirq.c:309 run_ksoftirqd+0x23/0x30 kernel/softirq.c:670 smpboot_thread_fn+0x545/0x930 kernel/smpboot.c:164 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299 Allocated by task 22706: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0x18a/0x2e0 mm/slub.c:2974 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] f2fs_fill_super+0xc5/0x7e30 fs/f2fs/super.c:4049 mount_bdev+0x262/0x370 fs/super.c:1429 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4555 legacy_get_tree+0xf1/0x190 fs/fs_context.c:593 vfs_get_tree+0x88/0x290 fs/super.c:1559 do_new_mount+0x2ba/0xb30 fs/namespace.c:2910 path_mount+0x56f/0xcb0 fs/namespace.c:3240 do_mount fs/namespace.c:3253 [inline] __do_sys_mount fs/namespace.c:3461 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3438 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3438 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 Freed by task 21857: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1595 [inline] slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621 slab_free mm/slub.c:3203 [inline] kfree+0xc3/0x270 mm/slub.c:4191 f2fs_put_super+0xaa0/0xc10 fs/f2fs/super.c:1654 generic_shutdown_super+0x14f/0x2d0 fs/super.c:465 kill_block_super+0x7e/0xe0 fs/super.c:1456 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4587 deactivate_locked_super+0xad/0x110 fs/super.c:335 deactivate_super+0xbe/0xf0 fs/super.c:366 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 task_work_run+0x129/0x190 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0xc5/0x1d0 kernel/entry/common.c:274 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xc6 The buggy address belongs to the object at ffff8881297e4000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1676 bytes inside of 4096-byte region [ffff8881297e4000, ffff8881297e5000) The buggy address belongs to the page: page:ffffea0004a5f800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1297e0 head:ffffea0004a5f800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea000457a400 0000000300000003 ffff888100042c00 raw: 0000000000000000 0000000000040004 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 0x1d60c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 9446, ts 345471777464, free_ts 345103708996 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5346 allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] __kmalloc+0x204/0x330 mm/slub.c:4029 __kmalloc_node include/linux/slab.h:418 [inline] kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x82/0x130 mm/util.c:612 kvmalloc include/linux/mm.h:822 [inline] kvzalloc include/linux/mm.h:830 [inline] alloc_netdev_mqs+0x8e/0xcd0 net/core/dev.c:10506 rtnl_create_link+0x240/0x950 net/core/rtnetlink.c:3192 __rtnl_newlink net/core/rtnetlink.c:3469 [inline] rtnl_newlink+0x1399/0x2000 net/core/rtnetlink.c:3527 rtnetlink_rcv_msg+0x955/0xc50 net/core/rtnetlink.c:5608 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2497 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5626 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1348 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1916 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x82c/0x850 mm/page_alloc.c:1629 free_the_page+0x76/0x370 mm/page_alloc.c:5407 __free_pages+0x67/0xc0 mm/page_alloc.c:5416 __free_slab+0xcf/0x190 mm/slub.c:1894 free_slab mm/slub.c:1909 [inline] discard_slab+0x29/0x40 mm/slub.c:1915 __slab_free+0x30d/0x3a0 mm/slub.c:3131 do_slab_free mm/slub.c:3191 [inline] ___cache_free+0x111/0x130 mm/slub.c:3210 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x47/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:440 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x61/0x2f0 mm/slab.h:583 slab_alloc_node mm/slub.c:2947 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc+0x168/0x2e0 mm/slub.c:2960 getname_flags+0xba/0x520 fs/namei.c:141 getname+0x19/0x20 fs/namei.c:212 do_sys_openat2+0xd7/0x6f0 fs/open.c:1211 Memory state around the buggy address: ffff8881297e4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881297e4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881297e4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881297e4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881297e4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================