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Message-ID: <20250702060138.GA5358@system.software.com>
Date: Wed, 2 Jul 2025 15:01:38 +0900
From: Byungchul Park <byungchul@...com>
To: Yeoreum Yun <yeoreum.yun@....com>
Cc: ryabinin.a.a@...il.com, glider@...gle.com, andreyknvl@...il.com,
dvyukov@...gle.com, vincenzo.frascino@....com,
kpm@...ux-foundation.org, bigeasy@...utronix.de,
clrkwllms@...nel.org, rostedt@...dmis.org,
max.byungchul.park@...il.com, kasan-dev@...glegroups.com,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
linux-rt-devel@...ts.linux.dev, nd@....com,
Yunseong Kim <ysk@...lloc.com>, kernel_team@...ynix.com
Subject: Re: [PATCH] kasan: don't call find_vm_area() in in_interrupt() for
possible deadlock
On Tue, Jul 01, 2025 at 09:35:45PM +0100, Yeoreum Yun wrote:
>
>
> Caution: External Email. Please take care when clicking links or opening attachments.
>
>
>
>
>
>
> In below senario, kasan causes deadlock while reporting vm area informaion:
>
> CPU0 CPU1
> vmalloc();
> alloc_vmap_area();
> spin_lock(&vn->busy.lock)
^
Here, it should be spin_lock_bh(&vn->busy.lock).
> spin_lock_bh(&some_lock);
> <interrupt occurs>
> <in softirq>
> spin_lock(&some_lock);
> <access invalid address>
> kasan_report();
> print_report();
> print_address_description();
> kasan_find_vm_area();
> find_vm_area();
> spin_lock(&vn->busy.lock) // deadlock!
^
It should be spin_lock_bh(&vn->busy.lock), since it can
be within a critical section of *spin_lock_bh*() to
avoid a deadlock with softirq involved.
Byungchul
> To resolve this possible deadlock, don't call find_vm_area()
> to prevent possible deadlock while kasan reports vm area information.
>
> Fixes: c056a364e954 ("kasan: print virtual mapping info in reports")
> Reported-by: Yunseong Kim <ysk@...lloc.com>
> Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
> ---
> Below report is from Yunseong Kim using DEPT:
>
> ===================================================
> DEPT: Circular dependency has been detected.
> 6.15.0-rc6-00043-ga83a69ec7f9f #5 Not tainted
> ---------------------------------------------------
> summary
> ---------------------------------------------------
> *** DEADLOCK ***
>
> context A
> [S] lock(report_lock:0)
> [W] lock(&vn->busy.lock:0)
> [E] unlock(report_lock:0)
>
> context B
> [S] lock(&tb->tb6_lock:0)
> [W] lock(report_lock:0)
> [E] unlock(&tb->tb6_lock:0)
>
> context C
> [S] write_lock(&ndev->lock:0)
> [W] lock(&tb->tb6_lock:0)
> [E] write_unlock(&ndev->lock:0)
>
> context D
> [S] lock(&vn->busy.lock:0)
> [W] write_lock(&ndev->lock:0)
> [E] unlock(&vn->busy.lock:0)
>
> [S]: start of the event context
> [W]: the wait blocked
> [E]: the event not reachable
> ---------------------------------------------------
> context A's detail
> ---------------------------------------------------
> context A
> [S] lock(report_lock:0)
> [W] lock(&vn->busy.lock:0)
> [E] unlock(report_lock:0)
>
> [S] lock(report_lock:0):
> [<ffff800080bd2600>] start_report mm/kasan/report.c:215 [inline]
> [<ffff800080bd2600>] kasan_report+0x74/0x1d4 mm/kasan/report.c:623
> stacktrace:
> __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
> _raw_spin_lock_irqsave+0x88/0xd8 kernel/locking/spinlock.c:162
> start_report mm/kasan/report.c:215 [inline]
> kasan_report+0x74/0x1d4 mm/kasan/report.c:623
> __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380
> fib6_ifdown+0x67c/0x6bc net/ipv6/route.c:4910
> fib6_clean_node+0x23c/0x4e0 net/ipv6/ip6_fib.c:2199
> fib6_walk_continue+0x38c/0x774 net/ipv6/ip6_fib.c:2124
> fib6_walk+0x158/0x31c net/ipv6/ip6_fib.c:2172
> fib6_clean_tree+0xe0/0x128 net/ipv6/ip6_fib.c:2252
> __fib6_clean_all+0x104/0x2b8 net/ipv6/ip6_fib.c:2268
> fib6_clean_all+0x3c/0x50 net/ipv6/ip6_fib.c:2279
> rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
> rt6_disable_ip+0x270/0x840 net/ipv6/route.c:4956
> addrconf_ifdown.isra.0+0x104/0x175c net/ipv6/addrconf.c:3857
> addrconf_notify+0x3a0/0x1688 net/ipv6/addrconf.c:3780
> notifier_call_chain+0x94/0x50c kernel/notifier.c:85
> raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453
> call_netdevice_notifiers_info+0xb8/0x150 net/core/dev.c:2176
>
> [W] lock(&vn->busy.lock:0):
> [<ffff800080ae57a0>] spin_lock include/linux/spinlock.h:351 [inline]
> [<ffff800080ae57a0>] find_vmap_area+0xa0/0x228 mm/vmalloc.c:2418
> stacktrace:
> spin_lock include/linux/spinlock.h:351 [inline]
> find_vmap_area+0xa0/0x228 mm/vmalloc.c:2418
> find_vm_area+0x20/0x68 mm/vmalloc.c:3208
> kasan_find_vm_area mm/kasan/report.c:398 [inline]
> print_address_description mm/kasan/report.c:432 [inline]
> print_report+0x3d8/0x54c mm/kasan/report.c:521
> kasan_report+0xb8/0x1d4 mm/kasan/report.c:634
> __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380
> fib6_ifdown+0x67c/0x6bc net/ipv6/route.c:4910
> fib6_clean_node+0x23c/0x4e0 net/ipv6/ip6_fib.c:2199
> fib6_walk_continue+0x38c/0x774 net/ipv6/ip6_fib.c:2124
> fib6_walk+0x158/0x31c net/ipv6/ip6_fib.c:2172
> fib6_clean_tree+0xe0/0x128 net/ipv6/ip6_fib.c:2252
> __fib6_clean_all+0x104/0x2b8 net/ipv6/ip6_fib.c:2268
> fib6_clean_all+0x3c/0x50 net/ipv6/ip6_fib.c:2279
> rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
> rt6_disable_ip+0x270/0x840 net/ipv6/route.c:4956
> addrconf_ifdown.isra.0+0x104/0x175c net/ipv6/addrconf.c:3857
> addrconf_notify+0x3a0/0x1688 net/ipv6/addrconf.c:3780
> notifier_call_chain+0x94/0x50c kernel/notifier.c:85
>
> [E] unlock(report_lock:0):
> (N/A)
> ---------------------------------------------------
> context B's detail
> ---------------------------------------------------
> context B
> [S] lock(&tb->tb6_lock:0)
> [W] lock(report_lock:0)
> [E] unlock(&tb->tb6_lock:0)
>
> [S] lock(&tb->tb6_lock:0):
> [<ffff80008a172d10>] spin_lock_bh include/linux/spinlock.h:356 [inline]
> [<ffff80008a172d10>] __fib6_clean_all+0xe8/0x2b8 net/ipv6/ip6_fib.c:2267
> stacktrace:
> __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
> _raw_spin_lock_bh+0x80/0xd0 kernel/locking/spinlock.c:178
> spin_lock_bh include/linux/spinlock.h:356 [inline]
> __fib6_clean_all+0xe8/0x2b8 net/ipv6/ip6_fib.c:2267
> fib6_clean_all+0x3c/0x50 net/ipv6/ip6_fib.c:2279
> rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
> rt6_disable_ip+0x270/0x840 net/ipv6/route.c:4956
> addrconf_ifdown.isra.0+0x104/0x175c net/ipv6/addrconf.c:3857
> addrconf_notify+0x3a0/0x1688 net/ipv6/addrconf.c:3780
> notifier_call_chain+0x94/0x50c kernel/notifier.c:85
> raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453
> call_netdevice_notifiers_info+0xb8/0x150 net/core/dev.c:2176
> call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
> call_netdevice_notifiers net/core/dev.c:2228 [inline]
> dev_close_many+0x290/0x4b8 net/core/dev.c:1731
> unregister_netdevice_many_notify+0x574/0x1fa0 net/core/dev.c:11940
> unregister_netdevice_many net/core/dev.c:12034 [inline]
> unregister_netdevice_queue+0x2b8/0x390 net/core/dev.c:11877
> unregister_netdevice include/linux/netdevice.h:3374 [inline]
> __tun_detach+0xec4/0x1180 drivers/net/tun.c:620
> tun_detach drivers/net/tun.c:636 [inline]
> tun_chr_close+0xa4/0x248 drivers/net/tun.c:3390
> __fput+0x374/0xa30 fs/file_table.c:465
> ____fput+0x20/0x3c fs/file_table.c:493
>
> [W] lock(report_lock:0):
> [<ffff800080bd2600>] start_report mm/kasan/report.c:215 [inline]
> [<ffff800080bd2600>] kasan_report+0x74/0x1d4 mm/kasan/report.c:623
> stacktrace:
> __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
> _raw_spin_lock_irqsave+0x6c/0xd8 kernel/locking/spinlock.c:162
> start_report mm/kasan/report.c:215 [inline]
> kasan_report+0x74/0x1d4 mm/kasan/report.c:623
> __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380
> fib6_ifdown+0x67c/0x6bc net/ipv6/route.c:4910
> fib6_clean_node+0x23c/0x4e0 net/ipv6/ip6_fib.c:2199
> fib6_walk_continue+0x38c/0x774 net/ipv6/ip6_fib.c:2124
> fib6_walk+0x158/0x31c net/ipv6/ip6_fib.c:2172
> fib6_clean_tree+0xe0/0x128 net/ipv6/ip6_fib.c:2252
> __fib6_clean_all+0x104/0x2b8 net/ipv6/ip6_fib.c:2268
> fib6_clean_all+0x3c/0x50 net/ipv6/ip6_fib.c:2279
> rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
> rt6_disable_ip+0x270/0x840 net/ipv6/route.c:4956
> addrconf_ifdown.isra.0+0x104/0x175c net/ipv6/addrconf.c:3857
> addrconf_notify+0x3a0/0x1688 net/ipv6/addrconf.c:3780
> notifier_call_chain+0x94/0x50c kernel/notifier.c:85
> raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453
> call_netdevice_notifiers_info+0xb8/0x150 net/core/dev.c:2176
>
> [E] unlock(&tb->tb6_lock:0):
> (N/A)
> ---------------------------------------------------
> context C's detail
> ---------------------------------------------------
> context C
> [S] write_lock(&ndev->lock:0)
> [W] lock(&tb->tb6_lock:0)
> [E] write_unlock(&ndev->lock:0)
>
> [S] write_lock(&ndev->lock:0):
> [<ffff80008a133bd8>] addrconf_permanent_addr net/ipv6/addrconf.c:3622 [inline]
> [<ffff80008a133bd8>] addrconf_notify+0xab4/0x1688 net/ipv6/addrconf.c:3698
> stacktrace:
> __raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline]
> _raw_write_lock_bh+0x88/0xd4 kernel/locking/spinlock.c:334
> addrconf_permanent_addr net/ipv6/addrconf.c:3622 [inline]
> addrconf_notify+0xab4/0x1688 net/ipv6/addrconf.c:3698
> notifier_call_chain+0x94/0x50c kernel/notifier.c:85
> raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453
> call_netdevice_notifiers_info+0xb8/0x150 net/core/dev.c:2176
> call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
> call_netdevice_notifiers net/core/dev.c:2228 [inline]
> __dev_notify_flags+0x114/0x294 net/core/dev.c:9393
> netif_change_flags+0x108/0x160 net/core/dev.c:9422
> do_setlink.isra.0+0x960/0x3464 net/core/rtnetlink.c:3152
> rtnl_changelink net/core/rtnetlink.c:3769 [inline]
> __rtnl_newlink net/core/rtnetlink.c:3928 [inline]
> rtnl_newlink+0x1080/0x1a1c net/core/rtnetlink.c:4065
> rtnetlink_rcv_msg+0x82c/0xc30 net/core/rtnetlink.c:6955
> netlink_rcv_skb+0x218/0x400 net/netlink/af_netlink.c:2534
> rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6982
> netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
> netlink_unicast+0x50c/0x778 net/netlink/af_netlink.c:1339
> netlink_sendmsg+0x794/0xc28 net/netlink/af_netlink.c:1883
> sock_sendmsg_nosec net/socket.c:712 [inline]
> __sock_sendmsg+0xe0/0x1a0 net/socket.c:727
> __sys_sendto+0x238/0x2fc net/socket.c:2180
>
> [W] lock(&tb->tb6_lock:0):
> [<ffff80008a1643fc>] spin_lock_bh include/linux/spinlock.h:356 [inline]
> [<ffff80008a1643fc>] __ip6_ins_rt net/ipv6/route.c:1350 [inline]
> [<ffff80008a1643fc>] ip6_route_add+0x7c/0x220 net/ipv6/route.c:3900
> stacktrace:
> __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
> _raw_spin_lock_bh+0x5c/0xd0 kernel/locking/spinlock.c:178
> spin_lock_bh include/linux/spinlock.h:356 [inline]
> __ip6_ins_rt net/ipv6/route.c:1350 [inline]
> ip6_route_add+0x7c/0x220 net/ipv6/route.c:3900
> addrconf_prefix_route+0x28c/0x494 net/ipv6/addrconf.c:2487
> fixup_permanent_addr net/ipv6/addrconf.c:3602 [inline]
> addrconf_permanent_addr net/ipv6/addrconf.c:3626 [inline]
> addrconf_notify+0xfd0/0x1688 net/ipv6/addrconf.c:3698
> notifier_call_chain+0x94/0x50c kernel/notifier.c:85
> raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453
> call_netdevice_notifiers_info+0xb8/0x150 net/core/dev.c:2176
> call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
> call_netdevice_notifiers net/core/dev.c:2228 [inline]
> __dev_notify_flags+0x114/0x294 net/core/dev.c:9393
> netif_change_flags+0x108/0x160 net/core/dev.c:9422
> do_setlink.isra.0+0x960/0x3464 net/core/rtnetlink.c:3152
> rtnl_changelink net/core/rtnetlink.c:3769 [inline]
> __rtnl_newlink net/core/rtnetlink.c:3928 [inline]
> rtnl_newlink+0x1080/0x1a1c net/core/rtnetlink.c:4065
> rtnetlink_rcv_msg+0x82c/0xc30 net/core/rtnetlink.c:6955
> netlink_rcv_skb+0x218/0x400 net/netlink/af_netlink.c:2534
> rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6982
> netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
> netlink_unicast+0x50c/0x778 net/netlink/af_netlink.c:1339
> netlink_sendmsg+0x794/0xc28 net/netlink/af_netlink.c:1883
>
> [E] write_unlock(&ndev->lock:0):
> (N/A)
> ---------------------------------------------------
> context D's detail
> ---------------------------------------------------
> context D
> [S] lock(&vn->busy.lock:0)
> [W] write_lock(&ndev->lock:0)
> [E] unlock(&vn->busy.lock:0)
>
> [S] lock(&vn->busy.lock:0):
> [<ffff800080adcf80>] spin_lock include/linux/spinlock.h:351 [inline]
> [<ffff800080adcf80>] alloc_vmap_area+0x800/0x26d0 mm/vmalloc.c:2027
> stacktrace:
> __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
> _raw_spin_lock+0x78/0xc0 kernel/locking/spinlock.c:154
> spin_lock include/linux/spinlock.h:351 [inline]
> alloc_vmap_area+0x800/0x26d0 mm/vmalloc.c:2027
> __get_vm_area_node+0x1c8/0x360 mm/vmalloc.c:3138
> __vmalloc_node_range_noprof+0x168/0x10d4 mm/vmalloc.c:3805
> __vmalloc_node_noprof+0x130/0x178 mm/vmalloc.c:3908
> vzalloc_noprof+0x3c/0x54 mm/vmalloc.c:3981
> alloc_counters net/ipv6/netfilter/ip6_tables.c:815 [inline]
> copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:837 [inline]
> get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline]
> do_ip6t_get_ctl+0x520/0xad0 net/ipv6/netfilter/ip6_tables.c:1677
> nf_getsockopt+0x8c/0x10c net/netfilter/nf_sockopt.c:116
> ipv6_getsockopt+0x24c/0x460 net/ipv6/ipv6_sockglue.c:1493
> tcp_getsockopt+0x98/0x120 net/ipv4/tcp.c:4727
> sock_common_getsockopt+0x9c/0xcc net/core/sock.c:3867
> do_sock_getsockopt+0x308/0x57c net/socket.c:2357
> __sys_getsockopt+0xec/0x188 net/socket.c:2386
> __do_sys_getsockopt net/socket.c:2393 [inline]
> __se_sys_getsockopt net/socket.c:2390 [inline]
> __arm64_sys_getsockopt+0xa8/0x110 net/socket.c:2390
> __invoke_syscall arch/arm64/kernel/syscall.c:36 [inline]
> invoke_syscall+0x88/0x2e0 arch/arm64/kernel/syscall.c:50
> el0_svc_common.constprop.0+0xe8/0x2e0 arch/arm64/kernel/syscall.c:139
>
> [W] write_lock(&ndev->lock:0):
> [<ffff80008a127f20>] addrconf_rs_timer+0xa0/0x730 net/ipv6/addrconf.c:4025
> stacktrace:
> __raw_write_lock include/linux/rwlock_api_smp.h:209 [inline]
> _raw_write_lock+0x5c/0xd0 kernel/locking/spinlock.c:300
> addrconf_rs_timer+0xa0/0x730 net/ipv6/addrconf.c:4025
> call_timer_fn+0x204/0x964 kernel/time/timer.c:1789
> expire_timers kernel/time/timer.c:1840 [inline]
> __run_timers+0x830/0xb00 kernel/time/timer.c:2414
> __run_timer_base kernel/time/timer.c:2426 [inline]
> __run_timer_base kernel/time/timer.c:2418 [inline]
> run_timer_base+0x124/0x198 kernel/time/timer.c:2435
> run_timer_softirq+0x20/0x58 kernel/time/timer.c:2445
> handle_softirqs+0x30c/0xdc0 kernel/softirq.c:579
> __do_softirq+0x14/0x20 kernel/softirq.c:613
> ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81
> call_on_irq_stack+0x24/0x30 arch/arm64/kernel/entry.S:891
> do_softirq_own_stack+0x20/0x40 arch/arm64/kernel/irq.c:86
> invoke_softirq kernel/softirq.c:460 [inline]
> __irq_exit_rcu+0x400/0x560 kernel/softirq.c:680
> irq_exit_rcu+0x14/0x80 kernel/softirq.c:696
> __el1_irq arch/arm64/kernel/entry-common.c:561 [inline]
> el1_interrupt+0x38/0x54 arch/arm64/kernel/entry-common.c:575
> el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580
> el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596
>
> [E] unlock(&vn->busy.lock:0):
> (N/A)
> ---------------------------------------------------
> information that might be helpful
> ---------------------------------------------------
> CPU: 1 UID: 0 PID: 19536 Comm: syz.4.2592 Not tainted 6.15.0-rc6-00043-ga83a69ec7f9f #5 PREEMPT
> Hardware name: QEMU KVM Virtual Machine, BIOS 2025.02-8 05/13/2025
> Call trace:
> dump_backtrace arch/arm64/kernel/stacktrace.c:449 [inline] (C)
> show_stack+0x34/0x80 arch/arm64/kernel/stacktrace.c:466 (C)
> __dump_stack lib/dump_stack.c:94 [inline]
> dump_stack_lvl+0x104/0x180 lib/dump_stack.c:120
> dump_stack+0x20/0x2c lib/dump_stack.c:129
> print_circle kernel/dependency/dept.c:928 [inline]
> cb_check_dl kernel/dependency/dept.c:1362 [inline]
> cb_check_dl+0x1080/0x10ec kernel/dependency/dept.c:1356
> bfs+0x4d8/0x630 kernel/dependency/dept.c:980
> check_dl_bfs kernel/dependency/dept.c:1381 [inline]
> add_dep+0x1cc/0x364 kernel/dependency/dept.c:1710
> add_wait kernel/dependency/dept.c:1829 [inline]
> __dept_wait+0x60c/0x16e0 kernel/dependency/dept.c:2585
> dept_wait kernel/dependency/dept.c:2666 [inline]
> dept_wait+0x168/0x1a8 kernel/dependency/dept.c:2640
> __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
> _raw_spin_lock+0x54/0xc0 kernel/locking/spinlock.c:154
> spin_lock include/linux/spinlock.h:351 [inline]
> find_vmap_area+0xa0/0x228 mm/vmalloc.c:2418
> find_vm_area+0x20/0x68 mm/vmalloc.c:3208
> kasan_find_vm_area mm/kasan/report.c:398 [inline]
> print_address_description mm/kasan/report.c:432 [inline]
> print_report+0x3d8/0x54c mm/kasan/report.c:521
> kasan_report+0xb8/0x1d4 mm/kasan/report.c:634
> __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380
> fib6_ifdown+0x67c/0x6bc net/ipv6/route.c:4910
> fib6_clean_node+0x23c/0x4e0 net/ipv6/ip6_fib.c:2199
> fib6_walk_continue+0x38c/0x774 net/ipv6/ip6_fib.c:2124
> fib6_walk+0x158/0x31c net/ipv6/ip6_fib.c:2172
> fib6_clean_tree+0xe0/0x128 net/ipv6/ip6_fib.c:2252
> __fib6_clean_all+0x104/0x2b8 net/ipv6/ip6_fib.c:2268
> fib6_clean_all+0x3c/0x50 net/ipv6/ip6_fib.c:2279
> rt6_sync_down_dev net/ipv6/route.c:4951 [inline]
> rt6_disable_ip+0x270/0x840 net/ipv6/route.c:4956
> addrconf_ifdown.isra.0+0x104/0x175c net/ipv6/addrconf.c:3857
> addrconf_notify+0x3a0/0x1688 net/ipv6/addrconf.c:3780
> notifier_call_chain+0x94/0x50c kernel/notifier.c:85
> raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453
> call_netdevice_notifiers_info+0xb8/0x150 net/core/dev.c:2176
> call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
> call_netdevice_notifiers net/core/dev.c:2228 [inline]
> dev_close_many+0x290/0x4b8 net/core/dev.c:1731
> unregister_netdevice_many_notify+0x574/0x1fa0 net/core/dev.c:11940
> unregister_netdevice_many net/core/dev.c:12034 [inline]
> unregister_netdevice_queue+0x2b8/0x390 net/core/dev.c:11877
> unregister_netdevice include/linux/netdevice.h:3374 [inline]
> __tun_detach+0xec4/0x1180 drivers/net/tun.c:620
> tun_detach drivers/net/tun.c:636 [inline]
> tun_chr_close+0xa4/0x248 drivers/net/tun.c:3390
> __fput+0x374/0xa30 fs/file_table.c:465
> ____fput+0x20/0x3c fs/file_table.c:493
> task_work_run+0x154/0x278 kernel/task_work.c:227
> exit_task_work include/linux/task_work.h:40 [inline]
> do_exit+0x950/0x23a8 kernel/exit.c:953
> do_group_exit+0xc0/0x248 kernel/exit.c:1103
> get_signal+0x1f98/0x20cc kernel/signal.c:3034
> do_signal+0x200/0x880 arch/arm64/kernel/signal.c:1658
> do_notify_resume+0x1a0/0x26c arch/arm64/kernel/entry-common.c:148
> exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
> exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
> el0_svc+0xf8/0x188 arch/arm64/kernel/entry-common.c:745
> el0t_64_sync_handler+0x10c/0x140 arch/arm64/kernel/entry-common.c:762
> el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
>
> ---
> mm/kasan/report.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/kasan/report.c b/mm/kasan/report.c
> index 8357e1a33699..61c590e8005e 100644
> --- a/mm/kasan/report.c
> +++ b/mm/kasan/report.c
> @@ -387,7 +387,7 @@ static inline struct vm_struct *kasan_find_vm_area(void *addr)
> static DEFINE_WAIT_OVERRIDE_MAP(vmalloc_map, LD_WAIT_SLEEP);
> struct vm_struct *va;
>
> - if (IS_ENABLED(CONFIG_PREEMPT_RT))
> + if (IS_ENABLED(CONFIG_PREEMPT_RT) || in_interrupt())
> return NULL;
>
> /*
> --
> LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}
>
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