================================================================== BUG: KASAN: use-after-free in hlist_move_list include/linux/list.h:843 [inline] BUG: KASAN: use-after-free in __collect_expired_timers kernel/time/timer.c:1482 [inline] BUG: KASAN: use-after-free in collect_expired_timers kernel/time/timer.c:1717 [inline] BUG: KASAN: use-after-free in __run_timers+0x54e/0x7a0 kernel/time/timer.c:1781 Write of size 8 at addr ffff8881a71071c8 by task syz-executor.5/13361 CPU: 0 PID: 13361 Comm: syz-executor.5 Not tainted 5.4.86-syzkaller-00678-ge627b02af655 #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+0x1dd/0x24e lib/dump_stack.c:118 print_address_description+0x96/0x640 mm/kasan/report.c:374 __kasan_report+0x177/0x1f0 mm/kasan/report.c:506 kasan_report+0x30/0x60 mm/kasan/common.c:634 hlist_move_list include/linux/list.h:843 [inline] __collect_expired_timers kernel/time/timer.c:1482 [inline] collect_expired_timers kernel/time/timer.c:1717 [inline] __run_timers+0x54e/0x7a0 kernel/time/timer.c:1781 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1798 __do_softirq+0x30f/0x769 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x1b4/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:547 [inline] smp_apic_timer_interrupt+0x2d1/0x460 arch/x86/kernel/apic/apic.c:1146 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:831 RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:65 Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 RSP: 0018:ffff8880b10be8b8 EFLAGS: 00000256 ORIG_RAX: ffffffffffffff13 RAX: 1ffff11016217d00 RBX: ffff8880b10bea98 RCX: 0000000000000000 RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff8880b10beac0 RBP: ffff8880b10bea50 R08: dffffc0000000000 R09: ffff8880b10beab0 R10: ffffed1016217d58 R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffffffff0b2780d R14: ffff8880b10beab0 R15: ffff8880b10bea60 unwind_next_frame+0x1155/0x1f30 arch/x86/kernel/unwind_orc.c:529 arch_stack_walk+0x114/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x120/0x1f0 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x129/0x1c0 mm/kasan/common.c:510 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2803 [inline] slab_alloc mm/slub.c:2811 [inline] kmem_cache_alloc+0x1e0/0x270 mm/slub.c:2816 kmem_cache_zalloc include/linux/slab.h:680 [inline] alloc_buffer_head+0x22/0xf0 fs/buffer.c:3352 alloc_page_buffers+0x109/0x3f0 fs/buffer.c:832 create_empty_buffers+0x36/0x4e0 fs/buffer.c:1530 ext4_block_write_begin+0x284/0x1210 fs/ext4/inode.c:1202 ext4_da_write_begin+0xbeb/0xfc0 fs/ext4/inode.c:3135 generic_perform_write+0x2f7/0x590 mm/filemap.c:3292 __generic_file_write_iter+0x232/0x460 mm/filemap.c:3421 ext4_file_write_iter+0x46f/0x1070 fs/ext4/file.c:270 do_iter_readv_writev+0x64e/0x8e0 include/linux/fs.h:1959 do_iter_write+0x16d/0x570 fs/read_write.c:970 iter_file_splice_write+0x7ce/0xf80 fs/splice.c:746 splice_direct_to_actor+0x496/0xb00 fs/splice.c:976 do_splice_direct+0x288/0x3e0 fs/splice.c:1064 do_sendfile+0x8e4/0x1130 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1ce/0x230 fs/read_write.c:1511 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1224237c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006 RBP: 000000000119c1c0 R08: 0000000000000000 R09: 0000000000000000 R10: 00008400fffffffa R11: 0000000000000246 R12: 000000000119c184 R13: 00007ffd939ffd6f R14: 00007f12242389c0 R15: 000000000119c184 The buggy address belongs to the page: page:ffffea00069c41c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x8000000000000000() raw: 8000000000000000 ffffea00064b5d08 ffffea00069c4188 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881a7107080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881a7107100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8881a7107180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8881a7107200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881a7107280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 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