syzbot


KASAN: invalid-access Write in __run_timers

Status: auto-closed as invalid on 2021/05/20 13:15
Subsystems: kernel
[Documentation on labels]
First crash: 1027d, last: 1020d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in __run_timers (3) reiserfs C error 4 92d 129d 0/25 upstream: reported C repro on 2023/07/30 21:30
android-54 KASAN: use-after-free Write in __run_timers syz 308 2d18h 1243d 0/2 upstream: reported syz repro on 2020/07/11 21:22
android-54 KASAN: slab-out-of-bounds Write in __run_timers 4 891d 1081d 0/2 auto-closed as invalid on 2021/10/26 12:53

Sample crash report:
==================================================================
BUG: KASAN: invalid-access in hlist_move_list include/linux/list.h:967 [inline]
BUG: KASAN: invalid-access in collect_expired_timers kernel/time/timer.c:1483 [inline]
BUG: KASAN: invalid-access in __run_timers.part.0+0xc0/0x230 kernel/time/timer.c:1720
Write at addr f5ff000027354da0 by task swapper/0/0
Pointer tag: [f5], memory tag: [fb]

CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.11.0-syzkaller #0
Hardware name: linux,dummy-virt (DT)
Call trace:
 dump_backtrace+0x0/0x1b0 arch/arm64/kernel/stacktrace.c:117
 show_stack+0x18/0x70 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+0x134/0x380 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+0x178/0x1bc arch/arm64/mm/fault.c:369
 do_bad_area arch/arm64/mm/fault.c:462 [inline]
 do_tag_check_fault+0x74/0x90 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+0xac/0xd0 arch/arm64/kernel/entry-common.c:209
 el1_sync+0x70/0x100 arch/arm64/kernel/entry.S:656
 hlist_move_list include/linux/list.h:967 [inline]
 collect_expired_timers kernel/time/timer.c:1483 [inline]
 __run_timers.part.0+0xc0/0x230 kernel/time/timer.c:1720
 __run_timers kernel/time/timer.c:1712 [inline]
 run_timer_softirq+0x3c/0x7c kernel/time/timer.c:1744
 _stext+0x124/0x2ac
 do_softirq_own_stack include/linux/interrupt.h:577 [inline]
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu kernel/softirq.c:420 [inline]
 irq_exit+0xdc/0xfc kernel/softirq.c:444
 __handle_domain_irq+0x80/0xe0 kernel/irq/irqdesc.c:692
 handle_domain_irq include/linux/irqdesc.h:176 [inline]
 gic_handle_irq+0x50/0xd0 drivers/irqchip/irq-gic.c:370
 el1_irq+0xb4/0x180 arch/arm64/kernel/entry.S:669
 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:37 [inline]
 arch_cpu_idle+0x18/0x30 arch/arm64/kernel/process.c:129
 default_idle_call+0x24/0x6c kernel/sched/idle.c:112
 cpuidle_idle_call kernel/sched/idle.c:194 [inline]
 do_idle+0x22c/0x29c kernel/sched/idle.c:299
 cpu_startup_entry+0x24/0x70 kernel/sched/idle.c:396
 rest_init+0xd8/0xe8 init/main.c:720
 arch_call_rest_init+0x10/0x1c
 start_kernel+0x520/0x558 init/main.c:1061

Allocated by task 6403:
 stack_trace_save+0x50/0x80 kernel/stacktrace.c:121
 kasan_save_stack+0x28/0x60 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_slab_alloc+0x1c/0x30 mm/kasan/common.c:437
 kasan_slab_alloc include/linux/kasan.h:209 [inline]
 slab_post_alloc_hook mm/slab.h:512 [inline]
 slab_alloc_node mm/slub.c:2892 [inline]
 slab_alloc mm/slub.c:2900 [inline]
 __kmalloc_track_caller+0x1a8/0x324 mm/slub.c:4479
 kmemdup+0x44/0x80 mm/util.c:128
 kmemdup include/linux/string.h:520 [inline]
 __addrconf_sysctl_register+0x4c/0x1a0 net/ipv6/addrconf.c:6913
 addrconf_sysctl_register net/ipv6/addrconf.c:6978 [inline]
 addrconf_sysctl_register+0x9c/0xc0 net/ipv6/addrconf.c:6967
 ipv6_add_dev+0x28c/0x4e0 net/ipv6/addrconf.c:443
 addrconf_notify+0x250/0x94c net/ipv6/addrconf.c:3489
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0x54/0x74 kernel/notifier.c:410
 call_netdevice_notifiers_info+0x58/0xa4 net/core/dev.c:2040
 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline]
 call_netdevice_notifiers net/core/dev.c:2066 [inline]
 register_netdevice+0x450/0x59c net/core/dev.c:10089
 veth_newlink+0x150/0x38c drivers/net/veth.c:1363
 __rtnl_newlink+0x604/0x800 net/core/rtnetlink.c:3443
 rtnl_newlink+0x70/0xa0 net/core/rtnetlink.c:3491
 rtnetlink_rcv_msg+0x118/0x334 net/core/rtnetlink.c:5553
 netlink_rcv_skb+0x5c/0x130 net/netlink/af_netlink.c:2494
 rtnetlink_rcv+0x18/0x2c net/core/rtnetlink.c:5571
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x25c/0x320 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x1d4/0x3e4 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0x54/0x60 net/socket.c:672
 __sys_sendto+0x118/0x14c net/socket.c:1975
 __do_sys_sendto net/socket.c:1987 [inline]
 __se_sys_sendto net/socket.c:1983 [inline]
 __arm64_sys_sendto+0x2c/0x40 net/socket.c:1983
 __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+0x74/0x90 arch/arm64/kernel/syscall.c:198
 el0_svc+0x14/0x20 arch/arm64/kernel/entry-common.c:365
 el0_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:381
 el0_sync+0x190/0x1c0 arch/arm64/kernel/entry.S:699

Freed by task 5645:
 stack_trace_save+0x50/0x80 kernel/stacktrace.c:121
 kasan_save_stack+0x28/0x60 mm/kasan/common.c:38
 kasan_set_track+0x28/0x40 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/hw_tags.c:174
 ____kasan_slab_free.constprop.0+0x184/0x1c0 mm/kasan/common.c:362
 __kasan_slab_free+0x10/0x20 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+0x98/0x18c mm/slub.c:1580
 slab_free mm/slub.c:3143 [inline]
 kfree+0x324/0x4a0 mm/slub.c:4139
 kvfree+0x3c/0x50 mm/util.c:616
 netdev_freemem+0x18/0x2c net/core/dev.c:10500
 netdev_release+0x30/0x44 net/core/net-sysfs.c:1828
 device_release+0x34/0x90 drivers/base/core.c:1980
 kobject_cleanup lib/kobject.c:705 [inline]
 kobject_release lib/kobject.c:736 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x74/0x120 lib/kobject.c:753
 netdev_run_todo+0x2d0/0x37c net/core/dev.c:10356
 rtnl_unlock+0x10/0x20 net/core/rtnetlink.c:112
 default_device_exit_batch+0x168/0x1a0 net/core/dev.c:11220
 ops_exit_list+0x64/0x80 net/core/net_namespace.c:190
 cleanup_net+0x23c/0x410 net/core/net_namespace.c:604
 process_one_work+0x1d8/0x360 kernel/workqueue.c:2275
 worker_thread+0x70/0x434 kernel/workqueue.c:2421
 kthread+0x174/0x180 kernel/kthread.c:292
 ret_from_fork+0x10/0x34 arch/arm64/kernel/entry.S:958

The buggy address belongs to the object at ffff000027354000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 3488 bytes inside of
 4096-byte region [ffff000027354000, ffff000027355000)
The buggy address belongs to the page:
page:0000000094ee1ab6 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x67350
head:0000000094ee1ab6 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x1ffffc000010200(slab|head)
raw: 01ffffc000010200 dead000000000100 dead000000000122 f6ff000004801900
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff000027354b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff000027354c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff000027354d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff000027354e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff000027354f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/02/19 13:10 upstream f40ddce88593 14052202 .config console log report info ci-qemu2-arm64-mte KASAN: invalid-access Write in __run_timers
2021/02/19 01:34 upstream f40ddce88593 14052202 .config console log report info ci-qemu2-arm64-mte KASAN: invalid-access Write in __run_timers
2021/02/18 13:18 upstream f40ddce88593 14052202 .config console log report info ci-qemu2-arm64-mte KASAN: invalid-access Write in __run_timers
2021/02/16 09:24 upstream f40ddce88593 98682e5e .config console log report info ci-qemu2-arm64-mte KASAN: invalid-access Write in __run_timers
2021/02/15 21:57 upstream f40ddce88593 98682e5e .config console log report info ci-qemu2-arm64-mte KASAN: invalid-access Write in __run_timers
2021/02/14 05:19 upstream 8cc8e6aaf27d 98682e5e .config console log report info ci-qemu2-arm64-mte KASAN: invalid-access Write in __run_timers
2021/02/13 18:43 upstream c6d8570e4d64 98682e5e .config console log report info ci-qemu2-arm64-mte KASAN: invalid-access Write in __run_timers
2021/02/13 00:28 upstream dcc0b49040c7 98682e5e .config console log report info ci-qemu2-arm64-mte KASAN: invalid-access Write in __run_timers
* Struck through repros no longer work on HEAD.