================================================================== BUG: KASAN: invalid-access in hlist_add_head include/linux/list.h:883 [inline] BUG: KASAN: invalid-access in enqueue_timer+0x18/0xc0 kernel/time/timer.c:581 Write at addr fdff0000201fa378 by task kworker/1:3/4303 Pointer tag: [fd], memory tag: [f6] CPU: 1 PID: 4303 Comm: kworker/1:3 Not tainted 5.11.0-rc5-syzkaller-00040-g76c057c84d28 #0 Hardware name: linux,dummy-virt (DT) Workqueue: events flush_stashed_error_work Call trace: dump_backtrace+0x0/0x1b0 arch/arm64/kernel/stacktrace.c:117 show_stack+0x1c/0x70 arch/arm64/kernel/stacktrace.c:196 __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xd0/0x12c lib/dump_stack.c:120 print_address_description+0x70/0x29c mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report+0x104/0x200 mm/kasan/report.c:413 report_tag_fault arch/arm64/mm/fault.c:311 [inline] do_tag_recovery arch/arm64/mm/fault.c:325 [inline] __do_kernel_fault+0x17c/0x1c0 arch/arm64/mm/fault.c:369 do_bad_area arch/arm64/mm/fault.c:462 [inline] do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:717 do_mem_abort+0x44/0xbc arch/arm64/mm/fault.c:793 el1_abort+0x40/0x6c arch/arm64/kernel/entry-common.c:118 el1_sync_handler+0xb0/0xcc arch/arm64/kernel/entry-common.c:209 el1_sync+0x70/0x100 arch/arm64/kernel/entry.S:656 hlist_add_head include/linux/list.h:883 [inline] enqueue_timer+0x18/0xc0 kernel/time/timer.c:581 mod_timer+0x18/0x24 kernel/time/timer.c:1106 ext4_update_super+0x324/0x370 fs/ext4/super.c:5537 ext4_commit_super+0x74/0x184 fs/ext4/super.c:5555 flush_stashed_error_work+0x34/0xb0 fs/ext4/super.c:727 process_one_work+0x1d8/0x360 kernel/workqueue.c:2275 worker_thread+0x74/0x440 kernel/workqueue.c:2421 kthread+0x178/0x180 kernel/kthread.c:292 ret_from_fork+0x10/0x30 arch/arm64/kernel/entry.S:958 Allocated by task 4593: stack_trace_save+0x50/0x80 kernel/stacktrace.c:121 kasan_save_stack+0x2c/0x60 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc+0xe8/0x160 mm/kasan/common.c:429 __kasan_kmalloc+0x18/0x24 mm/kasan/common.c:443 kasan_kmalloc include/linux/kasan.h:219 [inline] __kmalloc_node+0x1d0/0x3ac mm/slub.c:4019 kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x44/0xec mm/util.c:587 kvmalloc include/linux/mm.h:781 [inline] kvmalloc_array include/linux/mm.h:799 [inline] alloc_fdtable+0xb0/0x150 fs/file.c:118 dup_fd+0x244/0x324 fs/file.c:323 copy_files kernel/fork.c:1466 [inline] copy_process+0x5e8/0x14f0 kernel/fork.c:2085 kernel_clone+0x5c/0x3c0 kernel/fork.c:2462 __do_sys_clone+0x54/0x80 kernel/fork.c:2579 __se_sys_clone kernel/fork.c:2547 [inline] __arm64_sys_clone+0x24/0x30 kernel/fork.c:2547 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall arch/arm64/kernel/syscall.c:49 [inline] el0_svc_common.constprop.0+0x74/0x190 arch/arm64/kernel/syscall.c:159 do_el0_svc+0x78/0x90 arch/arm64/kernel/syscall.c:198 el0_svc+0x14/0x20 arch/arm64/kernel/entry-common.c:365 el0_sync_handler+0x1a8/0x1b0 arch/arm64/kernel/entry-common.c:381 el0_sync+0x190/0x1c0 arch/arm64/kernel/entry.S:699 Freed by task 17233: stack_trace_save+0x50/0x80 kernel/stacktrace.c:121 kasan_save_stack+0x2c/0x60 mm/kasan/common.c:38 kasan_set_track+0x2c/0x40 mm/kasan/common.c:46 kasan_set_free_info+0x24/0x30 mm/kasan/hw_tags.c:178 ____kasan_slab_free.constprop.0+0x184/0x1c0 mm/kasan/common.c:362 __kasan_slab_free+0x14/0x20 mm/kasan/common.c:369 kasan_slab_free include/linux/kasan.h:192 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x9c/0x190 mm/slub.c:1580 slab_free mm/slub.c:3143 [inline] kfree+0x328/0x4a4 mm/slub.c:4125 ext4_fill_super+0x350/0x3520 fs/ext4/super.c:5175 mount_bdev+0x1c4/0x1f0 fs/super.c:1366 ext4_mount+0x1c/0x30 fs/ext4/super.c:6593 legacy_get_tree+0x34/0x64 fs/fs_context.c:592 vfs_get_tree+0x2c/0xf0 fs/super.c:1496 do_new_mount fs/namespace.c:2881 [inline] path_mount+0x3e8/0xaf0 fs/namespace.c:3211 do_mount fs/namespace.c:3224 [inline] __do_sys_mount fs/namespace.c:3432 [inline] __se_sys_mount fs/namespace.c:3409 [inline] __arm64_sys_mount+0x1a8/0x2fc fs/namespace.c:3409 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall arch/arm64/kernel/syscall.c:49 [inline] el0_svc_common.constprop.0+0x74/0x190 arch/arm64/kernel/syscall.c:159 do_el0_svc+0x78/0x90 arch/arm64/kernel/syscall.c:198 el0_svc+0x14/0x20 arch/arm64/kernel/entry-common.c:365 el0_sync_handler+0x1a8/0x1b0 arch/arm64/kernel/entry-common.c:381 el0_sync+0x190/0x1c0 arch/arm64/kernel/entry.S:699 The buggy address belongs to the object at ffff0000201fa000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 888 bytes inside of 2048-byte region [ffff0000201fa000, ffff0000201fa800) The buggy address belongs to the page: page:00000000ba5eed36 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x601f8 head:00000000ba5eed36 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x1ffffc000010200(slab|head) raw: 01ffffc000010200 0000000000000000 0000000400000001 f1ff000004001a00 raw: 0000000000000000 0000000080080008 00000001ffffffff f4ff000020149701 page dumped because: kasan: bad access detected pages's memcg:f4ff000020149701 Memory state around the buggy address: ffff0000201fa100: f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 ffff0000201fa200: f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 >ffff0000201fa300: f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 ^ ffff0000201fa400: f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 ffff0000201fa500: f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 f6 ==================================================================