================================================================== BUG: KASAN: slab-use-after-free in __flush_workqueue+0x1701/0x1710 kernel/workqueue.c:3965 Write of size 4 at addr ffff888022da5cb4 by task syz-executor.2/10501 CPU: 0 PID: 10501 Comm: syz-executor.2 Not tainted 6.10.0-rc3-next-20240611-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:91 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:117 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 __flush_workqueue+0x1701/0x1710 kernel/workqueue.c:3965 drain_workqueue+0xc9/0x3a0 kernel/workqueue.c:4101 destroy_workqueue+0xba/0xc40 kernel/workqueue.c:5812 gfs2_fill_super+0x12a4/0x2520 fs/gfs2/ops_fstype.c:1311 get_tree_bdev+0x3f7/0x570 fs/super.c:1615 gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1330 vfs_get_tree+0x90/0x2a0 fs/super.c:1780 do_new_mount+0x2be/0xb40 fs/namespace.c:3379 do_mount fs/namespace.c:3719 [inline] __do_sys_mount fs/namespace.c:3925 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3902 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbd5ae7e5aa Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbd5bb2aef8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbd5bb2af80 RCX: 00007fbd5ae7e5aa RDX: 0000000020000000 RSI: 0000000020000040 RDI: 00007fbd5bb2af40 RBP: 0000000020000000 R08: 00007fbd5bb2af80 R09: 0000000000008c1b R10: 0000000000008c1b R11: 0000000000000202 R12: 0000000020000040 R13: 00007fbd5bb2af40 R14: 000000000001279b R15: 00000000200001c0 Allocated by task 10501: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4140 [inline] __kmalloc_noprof+0x1f9/0x400 mm/slub.c:4153 kmalloc_noprof include/linux/slab.h:664 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] alloc_workqueue+0x1b0/0x2040 kernel/workqueue.c:5681 gfs2_fill_super+0x1163/0x2520 fs/gfs2/ops_fstype.c:1192 get_tree_bdev+0x3f7/0x570 fs/super.c:1615 gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1330 vfs_get_tree+0x90/0x2a0 fs/super.c:1780 do_new_mount+0x2be/0xb40 fs/namespace.c:3379 do_mount fs/namespace.c:3719 [inline] __do_sys_mount fs/namespace.c:3925 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3902 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 9778: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2214 [inline] slab_free mm/slub.c:4455 [inline] kfree+0x149/0x360 mm/slub.c:4576 rcu_do_batch kernel/rcu/tree.c:2564 [inline] rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2838 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 __call_rcu_common kernel/rcu/tree.c:3101 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3205 kthread_worker_fn+0x500/0xaf0 kernel/kthread.c:842 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888022da5c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 180 bytes inside of freed 512-byte region [ffff888022da5c00, ffff888022da5e00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22da4 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff888015041c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff888015041c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000 head: 00fff00000000002 ffffea00008b6901 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4546, tgid 4546 (udevadm), ts 29615093607, free_ts 29474642999 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1470 prep_new_page mm/page_alloc.c:1478 [inline] get_page_from_freelist+0x2cbd/0x2d70 mm/page_alloc.c:3457 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4715 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2283 allocate_slab+0x5a/0x2f0 mm/slub.c:2446 new_slab mm/slub.c:2499 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3685 __slab_alloc+0x58/0xa0 mm/slub.c:3775 __slab_alloc_node mm/slub.c:3828 [inline] slab_alloc_node mm/slub.c:4007 [inline] __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4166 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] kernfs_fop_open+0x3e0/0xd10 fs/kernfs/file.c:623 do_dentry_open+0x95a/0x1720 fs/open.c:959 do_open fs/namei.c:3661 [inline] path_openat+0x289f/0x3280 fs/namei.c:3818 do_filp_open+0x235/0x490 fs/namei.c:3845 do_sys_openat2+0x13e/0x1d0 fs/open.c:1409 do_sys_open fs/open.c:1424 [inline] __do_sys_openat fs/open.c:1440 [inline] __se_sys_openat fs/open.c:1435 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1435 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 4545 tgid 4545 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1089 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2621 discard_slab mm/slub.c:2545 [inline] __put_partials+0xeb/0x130 mm/slub.c:3013 put_cpu_partial+0x17c/0x250 mm/slub.c:3088 __slab_free+0x2ea/0x3d0 mm/slub.c:4325 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3959 [inline] slab_alloc_node mm/slub.c:4019 [inline] __do_kmalloc_node mm/slub.c:4139 [inline] __kmalloc_noprof+0x1a3/0x400 mm/slub.c:4153 kmalloc_noprof include/linux/slab.h:664 [inline] tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x255/0x500 security/tomoyo/file.c:771 security_file_open+0x6a/0x730 security/security.c:2988 do_dentry_open+0x36c/0x1720 fs/open.c:946 do_open fs/namei.c:3661 [inline] path_openat+0x289f/0x3280 fs/namei.c:3818 do_filp_open+0x235/0x490 fs/namei.c:3845 do_sys_openat2+0x13e/0x1d0 fs/open.c:1409 do_sys_open fs/open.c:1424 [inline] __do_sys_openat fs/open.c:1440 [inline] __se_sys_openat fs/open.c:1435 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1435 Memory state around the buggy address: ffff888022da5b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888022da5c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888022da5c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888022da5d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888022da5d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================