overlayfs: missing 'lowerdir'
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-...!: (1 GPs behind) idle=cba/1/0x4000000000000004 softirq=90331/90332 fqs=5
rcu: (t=10500 jiffies g=82109 q=1462)
rcu: rcu_preempt kthread starved for 10467 jiffies! g82109 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt R running task 28880 10 2 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3515
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_timeout+0x4d8/0xef0 kernel/time/timer.c:1806
rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202
kthread+0x30b/0x410 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
NMI backtrace for cpu 0
CPU: 0 PID: 13784 Comm: syz-executor.2 Not tainted 4.19.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1340
print_cpu_stall kernel/rcu/tree.c:1478 [inline]
check_cpu_stall kernel/rcu/tree.c:1550 [inline]
__rcu_pending kernel/rcu/tree.c:3293 [inline]
rcu_pending kernel/rcu/tree.c:3336 [inline]
rcu_check_callbacks.cold+0x62d/0xe19 kernel/rcu/tree.c:2682
update_process_times+0x2a/0x70 kernel/time/timer.c:1638
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168
tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278
__run_hrtimer kernel/time/hrtimer.c:1401 [inline]
__hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463
hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1521
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:fib6_age+0x68/0x160 net/ipv6/ip6_fib.c:2094
Code: 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 c3 00 00 00 8b 5d 54 <31> ff 81 e3 00 00 40 00 89 de e8 e9 c2 21 fb 85 db 0f 84 84 00 00
RSP: 0018:ffff8880ae6075f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8647e661 RDI: ffff8880968dae54
RBP: ffff8880968dae00 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880ae607908
R13: 0000000100016db9 R14: ffffed1015cc0f02 R15: ffffed1015cc0f00
fib6_clean_node+0x263/0x510 net/ipv6/ip6_fib.c:1992
fib6_walk_continue+0x4ff/0x8d0 net/ipv6/ip6_fib.c:1918
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:1966
fib6_clean_tree+0xc2/0x100 net/ipv6/ip6_fib.c:2043
__fib6_clean_all+0x11f/0x2a0 net/ipv6/ip6_fib.c:2059
fib6_clean_all net/ipv6/ip6_fib.c:2070 [inline]
fib6_run_gc+0x110/0x2d0 net/ipv6/ip6_fib.c:2126
ip6_dst_gc+0x201/0x380 net/ipv6/route.c:2775
dst_alloc+0x14f/0x1a0 net/core/dst.c:101
ip6_dst_alloc+0x2e/0x100 net/ipv6/route.c:357
icmp6_dst_alloc+0x1ab/0x660 net/ipv6/route.c:2731
ndisc_send_skb+0xd10/0x1720 net/ipv6/ndisc.c:471
ndisc_send_rs+0x131/0x690 net/ipv6/ndisc.c:685
addrconf_rs_timer+0x2d9/0x640 net/ipv6/addrconf.c:3834
call_timer_fn+0x177/0x700 kernel/time/timer.c:1326
expire_timers+0x243/0x4e0 kernel/time/timer.c:1363
__run_timers kernel/time/timer.c:1684 [inline]
run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1697
__do_softirq+0x26c/0x9a0 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x215/0x260 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:544 [inline]
smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:page_remove_rmap+0x2/0x120 mm/rmap.c:1298
Code: 25 f3 ff ff 4c 89 f7 e8 9c 3b 08 00 e9 3c f6 ff ff e8 92 3b 08 00 e9 7a f6 ff ff e8 88 3b 08 00 e9 97 f6 ff ff 0f 1f 00 41 56 <41> 55 41 54 55 48 89 fd 53 89 f3 e8 1e 20 d2 ff 48 8d 7d 08 48 b8
RSP: 0018:ffff888028bb7758 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000003 RBX: 0000000000000000 RCX: ffffffff8192fda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea00026e7740
RBP: ffffea00026e7748 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: dead000000000100
R13: ffffea00026e7740 R14: dffffc0000000000 R15: 00007fdd76f67000
zap_pte_range mm/memory.c:1338 [inline]
zap_pmd_range mm/memory.c:1440 [inline]
zap_pud_range mm/memory.c:1469 [inline]
zap_p4d_range mm/memory.c:1490 [inline]
unmap_page_range+0x12f6/0x2a70 mm/memory.c:1511
unmap_single_vma+0x198/0x300 mm/memory.c:1556
unmap_vmas+0xa9/0x180 mm/memory.c:1586
exit_mmap+0x2b9/0x510 mm/mmap.c:3091
__mmput kernel/fork.c:1015 [inline]
mmput+0x14e/0x4a0 kernel/fork.c:1036
exit_mm kernel/exit.c:546 [inline]
do_exit+0xab5/0x2b70 kernel/exit.c:874
do_group_exit+0x125/0x310 kernel/exit.c:990
get_signal+0x3f2/0x1f70 kernel/signal.c:2588
do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:821
exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fdd75812c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 000000000000001c RBX: 0000000000502480 RCX: 000000000045cba9
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000008
RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a28 R14: 00000000004cd0d9 R15: 00007fdd758136d4
watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz-executor.0:13830]
Modules linked in:
irq event stamp: 13575271
hardirqs last enabled at (13575270): [] trace_hardirqs_on_thunk+0x1a/0x1c
hardirqs last disabled at (13575271): [] trace_hardirqs_off_thunk+0x1a/0x1c
softirqs last enabled at (20930): [] __do_softirq+0x69a/0x9a0 kernel/softirq.c:318
softirqs last disabled at (21617): [] invoke_softirq kernel/softirq.c:372 [inline]
softirqs last disabled at (21617): [] irq_exit+0x215/0x260 kernel/softirq.c:412
CPU: 1 PID: 13830 Comm: syz-executor.0 Not tainted 4.19.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:debug_lockdep_rcu_enabled+0x5b/0xe0 kernel/rcu/update.c:253
Code: 73 2c 56 08 85 f6 74 79 48 c7 c0 e0 66 1c 89 48 ba 00 00 00 00 00 fc ff df 48 89 c1 83 e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 <38> d0 7c 04 84 d2 75 64 8b 0d 17 f1 c4 07 85 c9 74 45 65 48 8b 1c
RSP: 0018:ffff8880ae7076e0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000003 RBX: ffff8880927d9400 RCX: 1ffffffff1238cdc
RDX: 0000000000000004 RSI: 0000000000000002 RDI: ffff8880a5207490
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000000 R12: ffff8880ae7077b0
R13: ffff8880a5207680 R14: ffff8880a5207480 R15: ffffed1015ce0efb
FS: 00007f6cb2f9b700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000078c000 CR3: 000000008f8bf000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
fib6_walk_continue+0x1f0/0x8d0 net/ipv6/ip6_fib.c:1936
fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:1966
fib6_clean_tree+0xc2/0x100 net/ipv6/ip6_fib.c:2043
__fib6_clean_all+0x11f/0x2a0 net/ipv6/ip6_fib.c:2059
fib6_clean_all net/ipv6/ip6_fib.c:2070 [inline]
fib6_run_gc+0x110/0x2d0 net/ipv6/ip6_fib.c:2126
ip6_dst_gc+0x201/0x380 net/ipv6/route.c:2775
dst_alloc+0x14f/0x1a0 net/core/dst.c:101
ip6_dst_alloc+0x2e/0x100 net/ipv6/route.c:357
icmp6_dst_alloc+0x1ab/0x660 net/ipv6/route.c:2731
ndisc_send_skb+0xd10/0x1720 net/ipv6/ndisc.c:471
ndisc_send_rs+0x131/0x690 net/ipv6/ndisc.c:685
addrconf_rs_timer+0x2d9/0x640 net/ipv6/addrconf.c:3834
call_timer_fn+0x177/0x700 kernel/time/timer.c:1326
expire_timers+0x243/0x4e0 kernel/time/timer.c:1363
__run_timers kernel/time/timer.c:1684 [inline]
run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1697
__do_softirq+0x26c/0x9a0 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x215/0x260 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:544 [inline]
smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:console_unlock+0xe7b/0x1110 kernel/printk/printk.c:2437
Code: ff df 48 c1 e8 03 80 3c 08 00 0f 85 66 02 00 00 48 83 3d df d6 7d 07 00 0f 84 9e 00 00 00 e8 cc 23 15 00 48 8b 7c 24 30 57 9d <0f> 1f 44 00 00 e9 9b fc ff ff e8 b6 23 15 00 0f 0b e8 af 23 15 00
RSP: 0018:ffff888088847918 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc90005aa4000
RDX: 0000000000017c61 RSI: ffffffff81548474 RDI: 0000000000000216
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff845c5760
R13: 000000000000002d R14: 0000000000000000 R15: ffffffff8945f930
vprintk_emit+0x2b8/0x730 kernel/printk/printk.c:1937
vprintk_func+0x79/0x17e kernel/printk/printk_safe.c:398
printk+0xba/0xed kernel/printk/printk.c:2012
ovl_fill_super.cold+0x72c/0x83d fs/overlayfs/super.c:1564
mount_nodev+0x60/0x110 fs/super.c:1204
mount_fs+0xa3/0x30c fs/super.c:1261
vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2469 [inline]
do_mount+0x113c/0x2f10 fs/namespace.c:2799
ksys_mount+0xcf/0x130 fs/namespace.c:3015
__do_sys_mount fs/namespace.c:3029 [inline]
__se_sys_mount fs/namespace.c:3026 [inline]
__x64_sys_mount+0xba/0x150 fs/namespace.c:3026
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f6cb2f9ac78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000004f7a40 RCX: 000000000045cba9
RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 000000000040000a
RBP: 000000000078bf00 R08: 0000000020000100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000077f R14: 00000000004ca7d2 R15: 00007f6cb2f9b6d4
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 13784 Comm: syz-executor.2 Not tainted 4.19.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:2316 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:2336 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:2390 [inline]
RIP: 0010:__lock_acquire+0xbc1/0x3ff0 kernel/locking/lockdep.c:3415
Code: df 49 0f af cc 48 c1 e9 31 4c 8d 04 cd 80 18 3d 8b 4c 89 c2 48 c1 ea 03 80 3c 02 00 0f 85 83 25 00 00 48 8b 1c cd 80 18 3d 8b <48> 85 db 74 55 48 83 eb 08 74 4f 48 bd 00 00 00 00 00 fc ff df eb
RSP: 0018:ffff8880ae606fe8 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffffffff8ae3ce08 RCX: 00000000000038f1
RDX: 1ffffffff167dc01 RSI: 000000005d2b3e1a RDI: 0000000000000000
RBP: 0000000000000040 R08: ffffffff8b3ee008 R09: 0000000000000003
R10: ffff88802bd22d00 R11: ffffffff8ad1f01b R12: 7170dcb0adc0c534
R13: ffff88802bd22400 R14: ffff88802bd22d18 R15: 0000000000000001
FS: 00007fdd75813700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000400200 CR3: 0000000083dd1000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907
seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline]
read_seqcount_begin include/linux/seqlock.h:164 [inline]
ktime_get+0xd0/0x2f0 kernel/time/timekeeping.c:756
hrtimer_forward_now include/linux/hrtimer.h:479 [inline]
perf_swevent_hrtimer+0x318/0x3e0 kernel/events/core.c:9242
__run_hrtimer kernel/time/hrtimer.c:1401 [inline]
__hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463
hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1521
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:__read_once_size include/linux/compiler.h:193 [inline]
RIP: 0010:trylock_clear_pending kernel/locking/qspinlock_paravirt.h:123 [inline]
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:436 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x3b0/0xae0 kernel/locking/qspinlock.c:474
Code: 00 48 c1 e9 03 83 e3 07 41 be 01 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8d 2c 01 eb 0c f3 90 41 83 ec 01 0f 84 38 04 00 00 <41> 0f b6 45 00 38 d8 7f 08 84 c0 0f 85 75 05 00 00 0f b6 45 00 84
RSP: 0018:ffff8880ae6077e0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1ffff110122c09e7
RDX: 0000000000000001 RSI: ffff888091604f39 RDI: ffff888091604f3a
RBP: ffff888091604f38 R08: 0000000000000001 R09: ffffed10122c09e7
R10: ffff888091604f3b R11: 0000000000000000 R12: 0000000000003e9e
R13: ffffed10122c09e7 R14: 0000000000000001 R15: ffff8880ae62d000
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:679 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:53 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:88 [inline]
do_raw_spin_lock+0x189/0x220 kernel/locking/spinlock_debug.c:113
spin_lock_bh include/linux/spinlock.h:334 [inline]
fib6_run_gc+0x95/0x2d0 net/ipv6/ip6_fib.c:2117
ip6_dst_gc+0x201/0x380 net/ipv6/route.c:2775
dst_alloc+0x14f/0x1a0 net/core/dst.c:101
ip6_dst_alloc+0x2e/0x100 net/ipv6/route.c:357
icmp6_dst_alloc+0x1ab/0x660 net/ipv6/route.c:2731
ndisc_send_skb+0xd10/0x1720 net/ipv6/ndisc.c:471
ndisc_send_rs+0x131/0x690 net/ipv6/ndisc.c:685
addrconf_rs_timer+0x2d9/0x640 net/ipv6/addrconf.c:3834
call_timer_fn+0x177/0x700 kernel/time/timer.c:1326
expire_timers+0x243/0x4e0 kernel/time/timer.c:1363
__run_timers kernel/time/timer.c:1684 [inline]
run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1697
__do_softirq+0x26c/0x9a0 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x215/0x260 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:544 [inline]
smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:page_remove_rmap+0x2/0x120 mm/rmap.c:1298
Code: 25 f3 ff ff 4c 89 f7 e8 9c 3b 08 00 e9 3c f6 ff ff e8 92 3b 08 00 e9 7a f6 ff ff e8 88 3b 08 00 e9 97 f6 ff ff 0f 1f 00 41 56 <41> 55 41 54 55 48 89 fd 53 89 f3 e8 1e 20 d2 ff 48 8d 7d 08 48 b8
RSP: 0018:ffff888028bb7758 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000003 RBX: 0000000000000000 RCX: ffffffff8192fda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea00026e7740
RBP: ffffea00026e7748 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: dead000000000100
R13: ffffea00026e7740 R14: dffffc0000000000 R15: 00007fdd76f67000
zap_pte_range mm/memory.c:1338 [inline]
zap_pmd_range mm/memory.c:1440 [inline]
zap_pud_range mm/memory.c:1469 [inline]
zap_p4d_range mm/memory.c:1490 [inline]
unmap_page_range+0x12f6/0x2a70 mm/memory.c:1511
unmap_single_vma+0x198/0x300 mm/memory.c:1556
unmap_vmas+0xa9/0x180 mm/memory.c:1586
exit_mmap+0x2b9/0x510 mm/mmap.c:3091
__mmput kernel/fork.c:1015 [inline]
mmput+0x14e/0x4a0 kernel/fork.c:1036
exit_mm kernel/exit.c:546 [inline]
do_exit+0xab5/0x2b70 kernel/exit.c:874
do_group_exit+0x125/0x310 kernel/exit.c:990
get_signal+0x3f2/0x1f70 kernel/signal.c:2588
do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:821
exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cba9
Code: 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fdd75812c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 000000000000001c RBX: 0000000000502480 RCX: 000000000045cba9
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000008
RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a28 R14: 00000000004cd0d9 R15: 00007fdd758136d4