{"id":"CVE-2024-49867","summary":"btrfs: wait for fixup workers before stopping cleaner kthread during umount","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: wait for fixup workers before stopping cleaner kthread during umount\n\nDuring unmount, at close_ctree(), we have the following steps in this order:\n\n1) Park the cleaner kthread - this doesn't destroy the kthread, it basically\n   halts its execution (wake ups against it work but do nothing);\n\n2) We stop the cleaner kthread - this results in freeing the respective\n   struct task_struct;\n\n3) We call btrfs_stop_all_workers() which waits for any jobs running in all\n   the work queues and then free the work queues.\n\nSyzbot reported a case where a fixup worker resulted in a crash when doing\na delayed iput on its inode while attempting to wake up the cleaner at\nbtrfs_add_delayed_iput(), because the task_struct of the cleaner kthread\nwas already freed. This can happen during unmount because we don't wait\nfor any fixup workers still running before we call kthread_stop() against\nthe cleaner kthread, which stops and free all its resources.\n\nFix this by waiting for any fixup workers at close_ctree() before we call\nkthread_stop() against the cleaner and run pending delayed iputs.\n\nThe stack traces reported by syzbot were the following:\n\n  BUG: KASAN: slab-use-after-free in __lock_acquire+0x77/0x2050 kernel/locking/lockdep.c:5065\n  Read of size 8 at addr ffff8880272a8a18 by task kworker/u8:3/52\n\n  CPU: 1 UID: 0 PID: 52 Comm: kworker/u8:3 Not tainted 6.12.0-rc1-syzkaller #0\n  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\n  Workqueue: btrfs-fixup btrfs_work_helper\n  Call Trace:\n   \u003cTASK\u003e\n   __dump_stack lib/dump_stack.c:94 [inline]\n   dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n   print_address_description mm/kasan/report.c:377 [inline]\n   print_report+0x169/0x550 mm/kasan/report.c:488\n   kasan_report+0x143/0x180 mm/kasan/report.c:601\n   __lock_acquire+0x77/0x2050 kernel/locking/lockdep.c:5065\n   lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825\n   __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]\n   _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162\n   class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]\n   try_to_wake_up+0xb0/0x1480 kernel/sched/core.c:4154\n   btrfs_writepage_fixup_worker+0xc16/0xdf0 fs/btrfs/inode.c:2842\n   btrfs_work_helper+0x390/0xc50 fs/btrfs/async-thread.c:314\n   process_one_work kernel/workqueue.c:3229 [inline]\n   process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310\n   worker_thread+0x870/0xd30 kernel/workqueue.c:3391\n   kthread+0x2f0/0x390 kernel/kthread.c:389\n   ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n   \u003c/TASK\u003e\n\n  Allocated by task 2:\n   kasan_save_stack mm/kasan/common.c:47 [inline]\n   kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n   unpoison_slab_object mm/kasan/common.c:319 [inline]\n   __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345\n   kasan_slab_alloc include/linux/kasan.h:247 [inline]\n   slab_post_alloc_hook mm/slub.c:4086 [inline]\n   slab_alloc_node mm/slub.c:4135 [inline]\n   kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4187\n   alloc_task_struct_node kernel/fork.c:180 [inline]\n   dup_task_struct+0x57/0x8c0 kernel/fork.c:1107\n   copy_process+0x5d1/0x3d50 kernel/fork.c:2206\n   kernel_clone+0x223/0x880 kernel/fork.c:2787\n   kernel_thread+0x1bc/0x240 kernel/fork.c:2849\n   create_kthread kernel/kthread.c:412 [inline]\n   kthreadd+0x60d/0x810 kernel/kthread.c:765\n   ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n\n  Freed by task 61:\n   kasan_save_stack mm/kasan/common.c:47 [inline]\n   kasan_save_track+0x3f/0x80 mm/kasan/common.c:68\n   kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579\n   poison_slab_object mm/kasan/common.c:247 [inline]\n   __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264\n   kasan_slab_free include/linux/kasan.h:230 [inline]\n   slab_free_h\n---truncated---","modified":"2026-05-18T05:59:01.550150804Z","published":"2024-10-21T18:01:09.962Z","related":["SUSE-SU-2024:3983-1","SUSE-SU-2024:3984-1","SUSE-SU-2024:3985-1","SUSE-SU-2024:3986-1","SUSE-SU-2024:4081-1","SUSE-SU-2024:4082-1","SUSE-SU-2024:4103-1","SUSE-SU-2024:4131-1","SUSE-SU-2024:4140-1","SUSE-SU-2024:4318-1","SUSE-SU-2024:4364-1","SUSE-SU-2024:4387-1","SUSE-SU-2025:03097-1","SUSE-SU-2025:03108-1","SUSE-SU-2025:03124-1","SUSE-SU-2025:03130-1","SUSE-SU-2025:03156-1","SUSE-SU-2025:03175-1","SUSE-SU-2025:03181-1","SUSE-SU-2025:03186-1","SUSE-SU-2025:03190-1","SUSE-SU-2025:03191-1","SUSE-SU-2025:03209-1","SUSE-SU-2025:03223-1","SUSE-SU-2025:03226-1","SUSE-SU-2025:0834-1","SUSE-SU-2025:20163-1","SUSE-SU-2025:20164-1","SUSE-SU-2025:20246-1","SUSE-SU-2025:20247-1","SUSE-SU-2025:20698-1","SUSE-SU-2025:20703-1","SUSE-SU-2025:20711-1","SUSE-SU-2025:20714-1","SUSE-SU-2025:20766-1","SUSE-SU-2025:20782-1","USN-7276-1","USN-7277-1","openSUSE-SU-2024:14500-1","openSUSE-SU-2025:14705-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49867.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/41fd1e94066a815a7ab0a7025359e9b40e4b3576"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4c98fe0dfa2ae83c4631699695506d8941db4bfe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/65d11eb276836d49003a8060cf31fa2284ad1047"},{"type":"WEB","url":"https://git.kernel.org/stable/c/70b60c8d9b42763d6629e44f448aa5d8ae477d61"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9da40aea63f8769f28afb91aea0fac4cf6fbbb65"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a71349b692ab34ea197949e13e3cc42570fe73d9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bf0de0f9a0544c11f96f93206da04ab87dcea1f4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed87190e9d9c80aad220fb6b0b03a84d22e2c95b"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49867.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-49867"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7a97311de48d56af6db4c5819f95faf9b0b23b1a"},{"fixed":"a71349b692ab34ea197949e13e3cc42570fe73d9"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f4b1363cae43fef7c86c993b7ca7fe7d546b3c68"},{"fixed":"70b60c8d9b42763d6629e44f448aa5d8ae477d61"},{"fixed":"4c98fe0dfa2ae83c4631699695506d8941db4bfe"},{"fixed":"9da40aea63f8769f28afb91aea0fac4cf6fbbb65"},{"fixed":"ed87190e9d9c80aad220fb6b0b03a84d22e2c95b"},{"fixed":"bf0de0f9a0544c11f96f93206da04ab87dcea1f4"},{"fixed":"65d11eb276836d49003a8060cf31fa2284ad1047"},{"fixed":"41fd1e94066a815a7ab0a7025359e9b40e4b3576"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"6026fd9da213daab95469356fe7fdcf29ae1a296"}]}],"versions":["v5.4.284","v5.4.283","v5.4.282","v5.4.281","v5.4.280","v5.4.279","v5.4.278","v5.4.277","v5.4.276","v5.4.275","v5.4.274","v5.4.273","v5.4.272","v5.4.271","v5.4.270","v5.4.269","v5.4.268","v5.4.267","v5.4.266","v5.4.265","v5.4.264","v5.4.263","v5.4.262","v5.4.261","v5.4.260","v5.4.259","v5.4.258","v5.4.257","v5.4.256","v5.4.255","v5.4.254","v5.4.253","v5.4.252","v5.4.251","v5.4.250","v5.4.249","v5.4.248","v5.4.247","v5.4.246","v5.4.245","v5.4.244","v5.4.243","v5.4.242","v5.4.241","v5.4.240","v5.4.239","v5.4.238","v5.4.237","v5.4.236","v5.4.235","v5.4.234","v5.4.233","v5.4.232","v5.4.231","v5.4.230","v5.4.229","v5.4.228","v5.4.227","v5.4.226","v5.4.225","v5.4.224","v5.4.223","v5.4.222","v5.4.221","v5.4.220","v5.4.219","v5.4.218","v5.4.217","v5.4.216","v5.4.215","v5.4.214","v5.4.213","v5.4.212","v5.4.211","v5.4.210","v5.4.209","v5.4.208","v5.4.207","v5.4.206","v5.4.205","v5.4.204","v5.4.203","v5.4.202","v5.4.201","v5.4.200","v5.4.199","v5.4.198","v5.4.197","v5.4.196","v5.4.195","v5.4.194","v5.4.193","v5.4.192","v5.4.191","v5.4.190","v5.4.189","v5.4.188","v5.4.187","v5.4.186","v5.4.185","v5.4.184","v5.4.183","v5.4.182","v5.4.181","v5.4.180","v5.4.179","v5.4.178","v5.4.177","v5.4.176","v5.4.175","v5.4.174","v5.4.173","v5.4.172","v5.4.171","v5.4.170","v5.4.169","v5.4.168","v5.4.167","v5.4.166","v5.4.165","v5.4.164","v5.4.163","v5.4.162","v5.4.161","v5.4.160","v5.4.159","v5.4.158","v5.4.157","v5.4.156","v5.4.155","v5.4.154","v5.4.153","v5.4.152","v5.4.151","v5.4.150","v5.4.149","v5.4.148","v5.4.147","v5.4.146","v5.4.145","v5.4.144","v5.4.143","v5.4.142","v5.4.141","v5.4.140","v5.4.139","v5.4.138","v5.4.13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