================================================================== BUG: KASAN: use-after-free in hrtimer_start_range_ns+0x1ef/0x200 kernel/time/hrtimer.c:1145 Read of size 1 at addr ffff88817e3b4042 by task io_uring-sq/31019 CPU: 0 PID: 31019 Comm: io_uring-sq Not tainted 5.4.121-syzkaller-00751-g1d3dcc209600 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x24e lib/dump_stack.c:118 print_address_description+0x9b/0x650 mm/kasan/report.c:384 __kasan_report+0x182/0x260 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:641 hrtimer_start_range_ns+0x1ef/0x200 kernel/time/hrtimer.c:1145 hrtimer_start include/linux/hrtimer.h:424 [inline] io_timeout fs/io_uring.c:2075 [inline] __io_submit_sqe+0x2e6e/0x3b80 fs/io_uring.c:2158 __io_queue_sqe+0x39/0xc70 fs/io_uring.c:2459 io_submit_sqes fs/io_uring.c:2776 [inline] io_sq_thread+0xdec/0x1c00 fs/io_uring.c:2902 kthread+0x30f/0x330 kernel/kthread.c:268 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 31019: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x137/0x1e0 mm/kasan/common.c:517 slab_post_alloc_hook mm/slab.h:584 [inline] kmem_cache_alloc_bulk+0x18e/0x290 mm/slub.c:3283 io_get_req+0x17a/0x590 fs/io_uring.c:652 io_submit_sqe+0x83/0xe80 fs/io_uring.c:2579 io_submit_sqes fs/io_uring.c:2776 [inline] io_sq_thread+0xdec/0x1c00 fs/io_uring.c:2902 kthread+0x30f/0x330 kernel/kthread.c:268 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Freed by task 31015: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:333 [inline] __kasan_slab_free+0x18a/0x240 mm/kasan/common.c:475 slab_free_hook mm/slub.c:1454 [inline] slab_free_freelist_hook+0x7b/0x150 mm/slub.c:1492 slab_free mm/slub.c:3072 [inline] kmem_cache_free+0xb8/0x5f0 mm/slub.c:3088 __io_free_req fs/io_uring.c:701 [inline] io_kill_timeout fs/io_uring.c:538 [inline] io_kill_timeouts fs/io_uring.c:548 [inline] io_ring_ctx_wait_and_kill+0x75e/0x14a0 fs/io_uring.c:3759 io_uring_release+0x57/0x70 fs/io_uring.c:3781 __fput+0x27d/0x6c0 fs/file_table.c:281 task_work_run+0x186/0x1b0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:163 [inline] prepare_exit_to_usermode+0x2b0/0x310 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88817e3b4000 which belongs to the cache io_kiocb of size 264 The buggy address is located 66 bytes inside of 264-byte region [ffff88817e3b4000, ffff88817e3b4108) The buggy address belongs to the page: page:ffffea0005f8ed00 refcount:1 mapcount:0 mapping:ffff8881f5fcd680 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5fcd680 raw: 0000000000000000 0000000080150015 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x19a/0x380 mm/page_alloc.c:2171 get_page_from_freelist+0x550/0x8b0 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x3a2/0x880 mm/page_alloc.c:4855 alloc_slab_page+0x39/0x3e0 mm/slub.c:342 allocate_slab mm/slub.c:1675 [inline] new_slab+0x97/0x460 mm/slub.c:1741 new_slab_objects mm/slub.c:2498 [inline] ___slab_alloc+0x330/0x4c0 mm/slub.c:2659 kmem_cache_alloc_bulk+0xc7/0x290 mm/slub.c:3257 io_get_req+0x17a/0x590 fs/io_uring.c:652 io_submit_sqe+0x83/0xe80 fs/io_uring.c:2579 io_submit_sqes fs/io_uring.c:2776 [inline] io_sq_thread+0xdec/0x1c00 fs/io_uring.c:2902 kthread+0x30f/0x330 kernel/kthread.c:268 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0xc60/0xd80 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4917 [inline] __free_pages+0x8f/0x250 mm/page_alloc.c:4923 __free_slab+0x237/0x2f0 mm/slub.c:1766 free_slab mm/slub.c:1781 [inline] discard_slab mm/slub.c:1787 [inline] unfreeze_partials+0x14f/0x180 mm/slub.c:2279 put_cpu_partial+0xb5/0x150 mm/slub.c:2315 __slab_free mm/slub.c:2963 [inline] do_slab_free mm/slub.c:3060 [inline] ___cache_free+0x352/0x4e0 mm/slub.c:3079 qlist_free_all mm/kasan/quarantine.c:167 [inline] quarantine_reduce+0x17a/0x1e0 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x43/0x1e0 mm/kasan/common.c:495 slab_post_alloc_hook mm/slab.h:584 [inline] kmem_cache_alloc_bulk+0x18e/0x290 mm/slub.c:3283 io_get_req+0x17a/0x590 fs/io_uring.c:652 io_submit_sqe+0x83/0xe80 fs/io_uring.c:2579 io_submit_sqes fs/io_uring.c:2776 [inline] io_sq_thread+0xdec/0x1c00 fs/io_uring.c:2902 kthread+0x30f/0x330 kernel/kthread.c:268 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Memory state around the buggy address: ffff88817e3b3f00: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88817e3b3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88817e3b4000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88817e3b4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88817e3b4100: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================