syzbot


INFO: trying to register non-static key in __fib6_clean_all (2)

Status: fixed on 2023/02/24 13:50
Subsystems: net
[Documentation on labels]
Fix commit: 5daadc86f27e net: tun: Fix use-after-free in tun_detach()
First crash: 614d, last: 589d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: trying to register non-static key in __fib6_clean_all net 1 2350d 2346d 0/26 closed as invalid on 2018/02/13 19:57

Sample crash report:
INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 1 PID: 14685 Comm: syz-executor.0 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156
 show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 assign_lock_key+0x134/0x140 kernel/locking/lockdep.c:979
 register_lock_class+0xc4/0x2f8 kernel/locking/lockdep.c:1292
 __lock_acquire+0xa8/0x30a4 kernel/locking/lockdep.c:4932
 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
 _raw_spin_lock_bh+0x54/0x6c kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:354 [inline]
 __fib6_clean_all+0xf0/0x2c4 net/ipv6/ip6_fib.c:2256
 fib6_clean_all+0x3c/0x50 net/ipv6/ip6_fib.c:2268
 rt6_sync_down_dev net/ipv6/route.c:4894 [inline]
 rt6_disable_ip+0x80/0xc8 net/ipv6/route.c:4899
 addrconf_ifdown+0x90/0xc30 net/ipv6/addrconf.c:3750
 addrconf_notify+0x218/0x848
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0x7c/0x108 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:1945 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]
 call_netdevice_notifiers net/core/dev.c:1997 [inline]
 netdev_wait_allrefs_any net/core/dev.c:10250 [inline]
 netdev_run_todo+0x340/0x6f0 net/core/dev.c:10364
 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:147
 tun_detach drivers/net/tun.c:704 [inline]
 tun_chr_close+0xe8/0xfc drivers/net/tun.c:3455
 __fput+0x198/0x3dc fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:353
 task_work_run+0xc4/0x14c kernel/task_work.c:177
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0x26c/0xbe0 kernel/exit.c:795
 do_group_exit+0x70/0xe8 kernel/exit.c:925
 get_signal+0xb0c/0xb40 kernel/signal.c:2857
 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1071
 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1124
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
------------[ cut here ]------------
WARNING: CPU: 1 PID: 14685 at net/ipv6/ip6_fib.c:2068 fib6_walk_continue+0x278/0x2b0 net/ipv6/ip6_fib.c:2068
Modules linked in:
CPU: 1 PID: 14685 Comm: syz-executor.0 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : fib6_walk_continue+0x278/0x2b0 net/ipv6/ip6_fib.c:2068
lr : fib6_walk_continue+0x278/0x2b0 net/ipv6/ip6_fib.c:2068
sp : ffff80001fbbb790
x29: ffff80001fbbb790 x28: 0000000000000000 x27: ffff0000e5721000
x26: ffff0000e5312510 x25: ffff0000e5721018 x24: ffff0000e5312510
x23: ffff0000e5312520 x22: ffff0000e5311a80 x21: ffff80000b765440
x20: 0000000000000000 x19: ffff80001fbbb7f8 x18: 0000000000000162
x17: 6e69676e45206574 x16: 0000000000000202 x15: 0000000000000000
x14: 0000000000000000 x13: 205d353836343154 x12: 5b5d313336323838
x11: ff8080000b77912c x10: 0000000000000000 x9 : ffff80000b77912c
x8 : ffff0000e77e3500 x7 : 545b5d3133363238 x6 : ffff80000b777988
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff0000e77e3500 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 fib6_walk_continue+0x278/0x2b0 net/ipv6/ip6_fib.c:2068
 fib6_walk net/ipv6/ip6_fib.c:2161 [inline]
 fib6_clean_tree net/ipv6/ip6_fib.c:2241 [inline]
 __fib6_clean_all+0x16c/0x2c4 net/ipv6/ip6_fib.c:2257
 fib6_clean_all+0x3c/0x50 net/ipv6/ip6_fib.c:2268
 rt6_sync_down_dev net/ipv6/route.c:4894 [inline]
 rt6_disable_ip+0x80/0xc8 net/ipv6/route.c:4899
 addrconf_ifdown+0x90/0xc30 net/ipv6/addrconf.c:3750
 addrconf_notify+0x218/0x848
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0x7c/0x108 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:1945 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]
 call_netdevice_notifiers net/core/dev.c:1997 [inline]
 netdev_wait_allrefs_any net/core/dev.c:10250 [inline]
 netdev_run_todo+0x340/0x6f0 net/core/dev.c:10364
 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:147
 tun_detach drivers/net/tun.c:704 [inline]
 tun_chr_close+0xe8/0xfc drivers/net/tun.c:3455
 __fput+0x198/0x3dc fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:353
 task_work_run+0xc4/0x14c kernel/task_work.c:177
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0x26c/0xbe0 kernel/exit.c:795
 do_group_exit+0x70/0xe8 kernel/exit.c:925
 get_signal+0xb0c/0xb40 kernel/signal.c:2857
 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1071
 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1124
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
irq event stamp: 6986
hardirqs last  enabled at (6985): [<ffff800008102154>] __local_bh_enable_ip+0x13c/0x1a4 kernel/softirq.c:401
hardirqs last disabled at (6983): [<ffff8000081020dc>] __local_bh_enable_ip+0xc4/0x1a4 kernel/softirq.c:378
softirqs last  enabled at (6984): [<ffff80000b6aa7a4>] spin_unlock_bh include/linux/spinlock.h:394 [inline]
softirqs last  enabled at (6984): [<ffff80000b6aa7a4>] clusterip_netdev_event+0x188/0x1ac net/ipv4/netfilter/ipt_CLUSTERIP.c:233
softirqs last disabled at (6986): [<ffff80000b777950>] spin_lock_bh include/linux/spinlock.h:354 [inline]
softirqs last disabled at (6986): [<ffff80000b777950>] __fib6_clean_all+0xf0/0x2c4 net/ipv6/ip6_fib.c:2256
---[ end trace 0000000000000000 ]---
Unable to handle kernel NULL pointer dereference at virtual address 00000000000000a0
Mem abort info:
  ESR = 0x0000000096000007
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x07: level 3 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000007
  CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=00000001091dd000
[00000000000000a0] pgd=0800000109073003, p4d=0800000109073003, pud=080000010ccea003, pmd=080000010aab3003, pte=0000000000000000
Internal error: Oops: 0000000096000007 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 14685 Comm: syz-executor.0 Tainted: G        W          6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __mutex_lock_common+0x78/0xca8 kernel/locking/mutex.c:582
lr : __mutex_lock_common+0x6c/0xca8 kernel/locking/mutex.c:580
sp : ffff80001fbbb900
x29: ffff80001fbbb970 x28: ffff80000ee2b000 x27: ffff80001fbbbaa8
x26: 0000000000000000 x25: 0000000000000001 x24: 0000000000000002
x23: ffff80000b4689d8 x22: 0000000000000000 x21: 0000000000000000
x20: 0000000000000000 x19: 0000000000000040 x18: 0000000000000189
x17: 000000000000b67e x16: 0000000000000000 x15: 0000000000000000
x14: 0000000000000000 x13: 000000000000000b x12: ffff80000d8094f0
x11: ff8080000b44ee74 x10: ffff80000d309358 x9 : 0000000000000000
x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : ffff80000b4689d8 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 00000000ffffffff x0 : 0000000000000000
Call trace:
 __mutex_lock_common+0x78/0xca8 kernel/locking/mutex.c:582
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 nf_tables_flowtable_event+0x60/0x1bc net/netfilter/nf_tables_api.c:8160
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0x7c/0x108 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:1945 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]
 call_netdevice_notifiers net/core/dev.c:1997 [inline]
 netdev_wait_allrefs_any net/core/dev.c:10250 [inline]
 netdev_run_todo+0x340/0x6f0 net/core/dev.c:10364
 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:147
 tun_detach drivers/net/tun.c:704 [inline]
 tun_chr_close+0xe8/0xfc drivers/net/tun.c:3455
 __fput+0x198/0x3dc fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:353
 task_work_run+0xc4/0x14c kernel/task_work.c:177
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0x26c/0xbe0 kernel/exit.c:795
 do_group_exit+0x70/0xe8 kernel/exit.c:925
 get_signal+0xb0c/0xb40 kernel/signal.c:2857
 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1071
 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1124
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
Code: 970671c3 b001735c b94a2b88 35000088 (f9403268) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	970671c3 	bl	0xfffffffffc19c70c
   4:	b001735c 	adrp	x28, 0x2e69000
   8:	b94a2b88 	ldr	w8, [x28, #2600]
   c:	35000088 	cbnz	w8, 0x1c
* 10:	f9403268 	ldr	x8, [x19, #96] <-- trapping instruction

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/10/11 01:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci bbed346d5a96 2b253ced .config console log report info [disk image] [vmlinux] ci-upstream-gce-arm64 INFO: trying to register non-static key in __fib6_clean_all
2022/09/28 00:43 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c194837ebb57 75c78242 .config console log report info [disk image] [vmlinux] ci-upstream-gce-arm64 INFO: trying to register non-static key in __fib6_clean_all
2022/09/16 19:12 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci a6b443748715 dd9a85ff .config console log report info [disk image] [vmlinux] ci-upstream-gce-arm64 INFO: trying to register non-static key in __fib6_clean_all
* Struck through repros no longer work on HEAD.