================================================================== BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3444 [inline] BUG: KASAN: double-free or invalid-free in kfree+0xe4/0x530 mm/slub.c:4504 CPU: 1 PID: 22585 Comm: syz-executor.4 Not tainted 5.14.0-rc4-next-20210806-syzkaller #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:105 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:381 ____kasan_slab_free mm/kasan/common.c:346 [inline] __kasan_slab_free+0x120/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1681 [inline] slab_free_freelist_hook+0x7e/0x190 mm/slub.c:1706 slab_free mm/slub.c:3444 [inline] kfree+0xe4/0x530 mm/slub.c:4504 bdev_free_inode+0xe0/0x110 fs/block_dev.c:816 i_callback+0x3f/0x70 fs/inode.c:224 rcu_do_batch kernel/rcu/tree.c:2506 [inline] rcu_core+0x7ab/0x1470 kernel/rcu/tree.c:2741 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:lock_release+0x3f1/0x720 kernel/locking/lockdep.c:5633 Code: 7e 83 f8 01 0f 85 8d 01 00 00 9c 58 f6 c4 02 0f 85 78 01 00 00 48 f7 04 24 00 02 00 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c5 48 c7 45 00 00 00 00 00 c7 45 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc9000b1bf9b8 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 290c7969da6fe61d RCX: ffffc9000b1bfa08 RDX: 1ffff1100612e13d RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffff92001637f39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000003 R14: ffff8880309709f0 R15: ffff888030970000 rcu_lock_release include/linux/rcupdate.h:272 [inline] rcu_read_unlock include/linux/rcupdate.h:720 [inline] ext4_get_group_desc+0x20d/0x500 fs/ext4/balloc.c:284 recently_deleted fs/ext4/ialloc.c:683 [inline] find_inode_bit+0x1c4/0x580 fs/ext4/ialloc.c:729 __ext4_new_inode+0xc4d/0x5c40 fs/ext4/ialloc.c:1064 ext4_symlink+0x489/0xd50 fs/ext4/namei.c:3465 vfs_symlink fs/namei.c:4184 [inline] vfs_symlink+0x473/0x6a0 fs/namei.c:4169 do_symlinkat+0x27a/0x300 fs/namei.c:4214 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 RIP: 0033:0x465ef7 Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 58 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe3aaafb58 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000465ef7 RDX: 00007ffe3aaafc43 RSI: 00000000004bfd6e RDI: 00007ffe3aaafc30 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe3aaaf9f0 R10: 00007ffe3aaaf8a7 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffe3aaafc30 Allocated by task 22563: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:522 kmalloc_node include/linux/slab.h:609 [inline] kzalloc_node include/linux/slab.h:732 [inline] __alloc_disk_node+0x4e/0x410 block/genhd.c:1272 __blk_mq_alloc_disk+0xec/0x190 block/blk-mq.c:3145 loop_add+0x324/0x940 drivers/block/loop.c:2344 loop_control_ioctl+0x130/0x450 drivers/block/loop.c:2493 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 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 22563: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1681 [inline] slab_free_freelist_hook+0x7e/0x190 mm/slub.c:1706 slab_free mm/slub.c:3444 [inline] kfree+0xe4/0x530 mm/slub.c:4504 __alloc_disk_node+0x359/0x410 block/genhd.c:1299 __blk_mq_alloc_disk+0xec/0x190 block/blk-mq.c:3145 loop_add+0x324/0x940 drivers/block/loop.c:2344 loop_control_ioctl+0x130/0x450 drivers/block/loop.c:2493 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 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 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1332 __queue_work+0x5c1/0xed0 kernel/workqueue.c:1498 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1461 [inline] __run_timers.part.0+0x49f/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1332 __queue_work+0x5c1/0xed0 kernel/workqueue.c:1498 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1461 [inline] __run_timers.part.0+0x49f/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 The buggy address belongs to the object at ffff88801d720400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 512-byte region [ffff88801d720400, ffff88801d720600) The buggy address belongs to the page: page:ffffea000075c800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d720 head:ffffea000075c800 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea000094da00 0000000700000007 ffff888010841c80 raw: 0000000000000000 0000000080100010 00000001ffffffff 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6558, ts 213310365895, free_ts 213199698801 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4152 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5374 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2188 alloc_slab_page mm/slub.c:1744 [inline] allocate_slab mm/slub.c:1881 [inline] new_slab+0x319/0x490 mm/slub.c:1944 ___slab_alloc+0x8b9/0xf50 mm/slub.c:2955 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3042 slab_alloc_node mm/slub.c:3133 [inline] __kmalloc_node_track_caller+0x2d4/0x350 mm/slub.c:4890 kmalloc_reserve net/core/skbuff.c:355 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:426 __napi_alloc_skb+0x70/0x310 net/core/skbuff.c:567 napi_alloc_skb include/linux/skbuff.h:2934 [inline] page_to_skb+0x18c/0xc30 drivers/net/virtio_net.c:430 receive_mergeable drivers/net/virtio_net.c:1020 [inline] receive_buf+0x337b/0x6370 drivers/net/virtio_net.c:1130 virtnet_receive drivers/net/virtio_net.c:1422 [inline] virtnet_poll+0x5bf/0x11c0 drivers/net/virtio_net.c:1531 __napi_poll+0xaf/0x440 net/core/dev.c:6982 napi_poll net/core/dev.c:7049 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7136 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x373/0x860 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3315 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3394 __unfreeze_partials+0x1bc/0x210 mm/slub.c:2476 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x8e/0xa0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3167 [inline] kmem_cache_alloc_node+0x25b/0x3d0 mm/slub.c:3203 __alloc_skb+0x20b/0x340 net/core/skbuff.c:414 alloc_skb_fclone include/linux/skbuff.h:1166 [inline] sk_stream_alloc_skb+0x109/0xc30 net/ipv4/tcp.c:887 tcp_sendmsg_locked+0xc78/0x2f10 net/ipv4/tcp.c:1309 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1461 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 sock_write_iter+0x289/0x3c0 net/socket.c:1057 call_write_iter include/linux/fs.h:2152 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x75a/0xa40 fs/read_write.c:605 Memory state around the buggy address: ffff88801d720300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801d720380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801d720400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801d720480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801d720500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================