================================================================== BUG: KASAN: use-after-free in __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 Read of size 8 at addr ffff88807bc8b430 by task syz-executor.2/7632 CPU: 1 PID: 7632 Comm: syz-executor.2 Tainted: G W 5.17.0-syzkaller-09727-g34af78c4e616 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xa5/0x3b1 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:434 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:451 __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 __wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:137 tty_release+0x657/0x1200 drivers/tty/tty_io.c:1781 __fput+0x286/0x9f0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:190 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:222 __syscall_exit_to_user_mode_work kernel/entry/common.c:304 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:315 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f7495c3bc8b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007fffaa82ce40 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f7495c3bc8b RDX: 0000000000000000 RSI: 00007f7495c00000 RDI: 0000000000000003 RBP: 00007f7495d9d960 R08: 0000000000000000 R09: 00000000ee5a65e1 R10: 0000000000000000 R11: 0000000000000293 R12: 000000000011a081 R13: 00007fffaa82cf40 R14: 00007fffaa82cf60 R15: 0000000000000032 Allocated by task 7610: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:524 kasan_kmalloc include/linux/kasan.h:249 [inline] kmem_cache_alloc_trace+0x1ea/0x4a0 mm/slab.c:3582 kmalloc include/linux/slab.h:581 [inline] io_arm_poll_handler+0x39d/0x940 fs/io_uring.c:6248 io_queue_sqe_arm_apoll+0x6d/0x430 fs/io_uring.c:7499 __io_queue_sqe fs/io_uring.c:7541 [inline] io_queue_sqe fs/io_uring.c:7568 [inline] io_submit_sqe fs/io_uring.c:7776 [inline] io_submit_sqes+0x7ddd/0x9310 fs/io_uring.c:7882 __do_sys_io_uring_enter+0x9f1/0x1520 fs/io_uring.c:10924 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 3975: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x13d/0x180 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:215 [inline] __cache_free mm/slab.c:3438 [inline] kfree+0xfb/0x2c0 mm/slab.c:3809 io_flush_apoll_cache fs/io_uring.c:10038 [inline] io_ring_ctx_free fs/io_uring.c:10064 [inline] io_ring_exit_work+0x7f7/0x1053 fs/io_uring.c:10244 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88807bc8b400 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 48 bytes inside of 96-byte region [ffff88807bc8b400, ffff88807bc8b460) The buggy address belongs to the page: page:ffffea0001ef22c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7bc8b flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea000091e408 ffffea0000738c88 ffff888010c40300 raw: 0000000000000000 ffff88807bc8b000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x342220(__GFP_HIGH|__GFP_ATOMIC|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 3690, ts 128886774718, free_ts 128881437360 prep_new_page mm/page_alloc.c:2382 [inline] get_page_from_freelist+0xba2/0x3df0 mm/page_alloc.c:4123 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5349 __alloc_pages_node include/linux/gfp.h:572 [inline] kmem_getpages mm/slab.c:1378 [inline] cache_grow_begin+0x75/0x350 mm/slab.c:2584 cache_alloc_refill+0x27f/0x380 mm/slab.c:2957 ____cache_alloc mm/slab.c:3040 [inline] ____cache_alloc mm/slab.c:3023 [inline] __do_cache_alloc mm/slab.c:3267 [inline] slab_alloc mm/slab.c:3309 [inline] kmem_cache_alloc_trace+0x380/0x4a0 mm/slab.c:3580 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [inline] nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:978 [inline] nsim_fib_event_nb+0x1b6/0xc50 drivers/net/netdevsim/fib.c:1028 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84 atomic_notifier_call_chain+0x70/0x180 kernel/notifier.c:199 call_fib_notifiers+0x119/0x2a0 net/core/fib_notifier.c:35 call_fib6_entry_notifiers net/ipv6/ip6_fib.c:402 [inline] fib6_add_rt2node net/ipv6/ip6_fib.c:1224 [inline] fib6_add+0xe21/0x3f10 net/ipv6/ip6_fib.c:1478 __ip6_ins_rt net/ipv6/route.c:1302 [inline] ip6_ins_rt+0xb2/0x110 net/ipv6/route.c:1312 __ipv6_ifa_notify+0x84e/0xa90 net/ipv6/addrconf.c:6135 ipv6_ifa_notify net/ipv6/addrconf.c:6174 [inline] addrconf_dad_completed+0x133/0xd30 net/ipv6/addrconf.c:4193 addrconf_dad_work+0x79f/0x1340 net/ipv6/addrconf.c:4141 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1348 [inline] free_pcp_prepare+0x548/0xd10 mm/page_alloc.c:1400 free_unref_page_prepare mm/page_alloc.c:3269 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3364 slab_destroy mm/slab.c:1630 [inline] slabs_destroy+0x89/0xc0 mm/slab.c:1650 cache_flusharray mm/slab.c:3411 [inline] ___cache_free+0x34e/0x670 mm/slab.c:3473 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x4f/0x1b0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x97/0xb0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:239 [inline] slab_post_alloc_hook mm/slab.h:749 [inline] slab_alloc mm/slab.c:3316 [inline] __kmem_cache_alloc_lru mm/slab.c:3492 [inline] kmem_cache_alloc+0x265/0x560 mm/slab.c:3512 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags include/linux/audit.h:323 [inline] getname+0x8e/0xd0 fs/namei.c:217 do_sys_openat2+0xf5/0x4d0 fs/open.c:1208 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff88807bc8b300: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88807bc8b380: 00 00 00 00 00 00 00 00 00 04 fc fc fc fc fc fc >ffff88807bc8b400: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88807bc8b480: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88807bc8b500: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================