================================================================== BUG: KASAN: slab-out-of-bounds in mini_qdisc_pair_swap+0x68/0x164 net/sched/sch_generic.c:1557 Read of size 8 at addr ffff00018c4b9000 by task kworker/u4:6/261 CPU: 1 PID: 261 Comm: kworker/u4:6 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Workqueue: netns cleanup_net Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x178/0x518 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 mini_qdisc_pair_swap+0x68/0x164 net/sched/sch_generic.c:1557 clsact_chain_head_change+0x28/0x38 net/sched/sch_ingress.c:60 tcf_chain_head_change_item net/sched/cls_api.c:493 [inline] tcf_chain0_head_change_cb_del+0x1e0/0x2d8 net/sched/cls_api.c:940 tcf_block_put_ext+0xfc/0x33c net/sched/cls_api.c:1529 clsact_destroy+0x1fc/0x790 net/sched/sch_ingress.c:300 __qdisc_destroy+0x160/0x4b8 net/sched/sch_generic.c:1067 qdisc_put net/sched/sch_generic.c:1094 [inline] shutdown_scheduler_queue+0x168/0x200 net/sched/sch_generic.c:1147 dev_shutdown+0x244/0x480 net/sched/sch_generic.c:1481 unregister_netdevice_many_notify+0x7f4/0x17b8 net/core/dev.c:11073 unregister_netdevice_many net/core/dev.c:11139 [inline] default_device_exit_batch+0xa1c/0xa9c net/core/dev.c:11619 ops_exit_list net/core/net_namespace.c:175 [inline] cleanup_net+0x5dc/0x8d0 net/core/net_namespace.c:618 process_one_work+0x694/0x1204 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2787 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 5782: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:575 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x26c/0x49c mm/slub.c:4012 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] uevent_show+0x160/0x320 drivers/base/core.c:2656 dev_attr_show+0x60/0xcc drivers/base/core.c:2364 sysfs_kf_seq_show+0x2d0/0x43c fs/sysfs/file.c:59 kernfs_seq_show+0x150/0x1fc fs/kernfs/file.c:205 seq_read_iter+0x3e0/0xc44 fs/seq_file.c:230 kernfs_fop_read_iter+0x144/0x5c8 fs/kernfs/file.c:279 call_read_iter include/linux/fs.h:2081 [inline] new_sync_read fs/read_write.c:395 [inline] vfs_read+0x78c/0x954 fs/read_write.c:476 ksys_read+0x15c/0x26c fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:627 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Freed by task 5782: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:589 poison_slab_object+0x124/0x18c mm/kasan/common.c:240 __kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x144/0x3cc mm/slub.c:4409 uevent_show+0x1c8/0x320 drivers/base/core.c:2669 dev_attr_show+0x60/0xcc drivers/base/core.c:2364 sysfs_kf_seq_show+0x2d0/0x43c fs/sysfs/file.c:59 kernfs_seq_show+0x150/0x1fc fs/kernfs/file.c:205 seq_read_iter+0x3e0/0xc44 fs/seq_file.c:230 kernfs_fop_read_iter+0x144/0x5c8 fs/kernfs/file.c:279 call_read_iter include/linux/fs.h:2081 [inline] new_sync_read fs/read_write.c:395 [inline] vfs_read+0x78c/0x954 fs/read_write.c:476 ksys_read+0x15c/0x26c fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:627 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 The buggy address belongs to the object at ffff00018c4b8000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 0 bytes to the right of allocated 4096-byte region [ffff00018c4b8000, ffff00018c4b9000) The buggy address belongs to the physical page: page:000000000267b9c9 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1cc4b8 head:000000000267b9c9 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000840(slab|head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 05ffc00000000840 ffff0000c0002140 fffffdffc6008a00 dead000000000002 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00018c4b8f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00018c4b8f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff00018c4b9000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff00018c4b9080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff00018c4b9100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== Unable to handle kernel paging request at virtual address e0d5c054000002d6 KASAN: maybe wild-memory-access in range [0x06b202a0000016b0-0x06b202a0000016b7] Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [e0d5c054000002d6] address between user and kernel address ranges Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 261 Comm: kworker/u4:6 Tainted: G B 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 Workqueue: netns cleanup_net pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : mini_qdisc_pair_swap+0x130/0x164 net/sched/sch_generic.c:1585 lr : mini_qdisc_pair_swap+0x124/0x164 net/sched/sch_generic.c:1585 sp : ffff800097bb74e0 x29: ffff800097bb74e0 x28: 1fffe00018f4985c x27: ffff800089180b74 x26: 1fffe00018f4986c x25: 06b202a000001696 x24: dfff800000000000 x23: 1fffe00031897200 x22: ffff00018c4b9000 x21: ffff0000c7a4c310 x20: 00000000000170f0 x19: 06b202a0000016b6 x18: 1fffe00036804396 x17: ffff80008ec9d000 x16: ffff800080276f8c x15: 0000000000000001 x14: 1ffff00011dcf390 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000001 x10: 0000000000000000 x9 : 1fffe00018b89781 x8 : 00d64054000002d6 x7 : 1fffe00036804397 x6 : ffff8000803be9e4 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0000c5c4bc00 x1 : 0000000000000000 x0 : 00000000000170f0 Call trace: mini_qdisc_pair_swap+0x130/0x164 net/sched/sch_generic.c:1585 clsact_chain_head_change+0x28/0x38 net/sched/sch_ingress.c:60 tcf_chain_head_change_item net/sched/cls_api.c:493 [inline] tcf_chain0_head_change_cb_del+0x1e0/0x2d8 net/sched/cls_api.c:940 tcf_block_put_ext+0xfc/0x33c net/sched/cls_api.c:1529 clsact_destroy+0x1fc/0x790 net/sched/sch_ingress.c:300 __qdisc_destroy+0x160/0x4b8 net/sched/sch_generic.c:1067 qdisc_put net/sched/sch_generic.c:1094 [inline] shutdown_scheduler_queue+0x168/0x200 net/sched/sch_generic.c:1147 dev_shutdown+0x244/0x480 net/sched/sch_generic.c:1481 unregister_netdevice_many_notify+0x7f4/0x17b8 net/core/dev.c:11073 unregister_netdevice_many net/core/dev.c:11139 [inline] default_device_exit_batch+0xa1c/0xa9c net/core/dev.c:11619 ops_exit_list net/core/net_namespace.c:175 [inline] cleanup_net+0x5dc/0x8d0 net/core/net_namespace.c:618 process_one_work+0x694/0x1204 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2787 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Code: 97b951d7 91008333 aa0003f4 d343fe68 (38786908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97b951d7 bl 0xfffffffffee5475c 4: 91008333 add x19, x25, #0x20 8: aa0003f4 mov x20, x0 c: d343fe68 lsr x8, x19, #3 * 10: 38786908 ldrb w8, [x8, x24] <-- trapping instruction