======================================================
WARNING: possible circular locking dependency detected
6.6.101-syzkaller #0 Not tainted
------------------------------------------------------
syz.0.6077/21060 is trying to acquire lock:
ffff88805f5ea238 (&trie->lock){-.-.}-{2:2}, at: trie_delete_elem+0x96/0x6a0 kernel/bpf/lpm_trie.c:467
but task is already holding lock:
ffffffff9707b150 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x6c/0x4b0 lib/debugobjects.c:709
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&obj_hash[i].lock){-.-.}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
__debug_check_no_obj_freed lib/debugobjects.c:979 [inline]
debug_check_no_obj_freed+0x13a/0x540 lib/debugobjects.c:1020
slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0xd2/0x1b0 mm/slub.c:1832
slab_free mm/slub.c:3816 [inline]
__kmem_cache_free+0xba/0x1f0 mm/slub.c:3829
trie_update_elem+0x6d1/0xea0 kernel/bpf/lpm_trie.c:444
bpf_map_update_value+0x660/0x720 kernel/bpf/syscall.c:201
map_update_elem+0x57b/0x700 kernel/bpf/syscall.c:1561
__sys_bpf+0x652/0x800 kernel/bpf/syscall.c:5455
__do_sys_bpf kernel/bpf/syscall.c:5571 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5569 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #0 (&trie->lock){-.-.}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
trie_delete_elem+0x96/0x6a0 kernel/bpf/lpm_trie.c:467
bpf_prog_ae0c3e605f35524c+0x45/0x49
bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline]
__bpf_prog_run include/linux/filter.h:612 [inline]
bpf_prog_run include/linux/filter.h:619 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline]
bpf_trace_run2+0x1d1/0x3c0 kernel/trace/bpf_trace.c:2361
__bpf_trace_contention_end+0xdd/0x130 include/trace/events/lock.h:122
trace_contention_end+0xe6/0x110 include/trace/events/lock.h:122
__pv_queued_spin_lock_slowpath+0x7ec/0x9d0 kernel/locking/qspinlock.c:560
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:586 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x24e/0x2c0 kernel/locking/spinlock_debug.c:115
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xb4/0xf0 kernel/locking/spinlock.c:162
debug_object_activate+0x6c/0x4b0 lib/debugobjects.c:709
debug_hrtimer_activate kernel/time/hrtimer.c:450 [inline]
debug_activate kernel/time/hrtimer.c:505 [inline]
enqueue_hrtimer+0x30/0x370 kernel/time/hrtimer.c:1113
__run_hrtimer kernel/time/hrtimer.c:1772 [inline]
__hrtimer_run_queues+0x637/0xc40 kernel/time/hrtimer.c:1819
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1881
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
orc_find arch/x86/kernel/unwind_orc.c:217 [inline]
unwind_next_frame+0x24c/0x2970 arch/x86/kernel/unwind_orc.c:494
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1806 [inline]
slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1832
slab_free mm/slub.c:3816 [inline]
kmem_cache_free+0xf8/0x280 mm/slub.c:3838
skb_kfree_head net/core/skbuff.c:943 [inline]
skb_free_head net/core/skbuff.c:957 [inline]
skb_release_data+0x60a/0x800 net/core/skbuff.c:987
skb_release_all net/core/skbuff.c:1053 [inline]
__kfree_skb+0x57/0x70 net/core/skbuff.c:1067
tcp_clean_rtx_queue net/ipv4/tcp_input.c:3444 [inline]
tcp_ack+0x1fb6/0x65e0 net/ipv4/tcp_input.c:4004
tcp_rcv_established+0xf23/0x1cf0 net/ipv4/tcp_input.c:6078
tcp_v4_do_rcv+0x4ed/0xb80 net/ipv4/tcp_ipv4.c:1734
tcp_v4_rcv+0x2334/0x2a50 net/ipv4/tcp_ipv4.c:2166
ip_protocol_deliver_rcu+0x20e/0x3f0 net/ipv4/ip_input.c:205
ip_local_deliver_finish+0x2ca/0x510 net/ipv4/ip_input.c:233
NF_HOOK+0x303/0x390 include/linux/netfilter.h:304
dst_input include/net/dst.h:477 [inline]
ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline]
ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline]
ip_sublist_rcv+0xa34/0xd20 net/ipv4/ip_input.c:639
ip_list_rcv+0x3e3/0x430 net/ipv4/ip_input.c:674
__netif_receive_skb_list_ptype net/core/dev.c:5639 [inline]
__netif_receive_skb_list_core+0x578/0x740 net/core/dev.c:5687
__netif_receive_skb_list net/core/dev.c:5739 [inline]
netif_receive_skb_list_internal+0x91b/0xc60 net/core/dev.c:5830
gro_normal_list include/net/gro.h:448 [inline]
napi_complete_done+0x32a/0x810 net/core/dev.c:6170
virtqueue_napi_complete drivers/net/virtio_net.c:450 [inline]
virtnet_poll+0xa44/0x1180 drivers/net/virtio_net.c:2231
__napi_poll+0xc0/0x460 net/core/dev.c:6600
napi_poll net/core/dev.c:6667 [inline]
net_rx_action+0x5ea/0xbf0 net/core/dev.c:6803
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
common_interrupt+0xb9/0xd0 arch/x86/kernel/irq.c:249
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:678
lock_is_held_type+0x13e/0x190 kernel/locking/lockdep.c:5830
lock_is_held include/linux/lockdep.h:288 [inline]
mmap_assert_locked include/linux/mmap_lock.h:65 [inline]
find_vma+0xad/0x1b0 mm/mmap.c:1883
lock_mm_and_find_vma+0x5f/0x300 mm/memory.c:5421
do_user_addr_fault+0x36c/0x12e0 arch/x86/mm/fault.c:1345
handle_page_fault arch/x86/mm/fault.c:1465 [inline]
exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
fault_in_readable+0xd0/0x160 mm/gup.c:1904
fault_in_iov_iter_readable+0xbf/0x2e0 lib/iov_iter.c:216
generic_perform_write+0x1f2/0x5b0 mm/filemap.c:4006
shmem_file_write_iter+0xfb/0x120 mm/shmem.c:2884
call_write_iter include/linux/fs.h:2018 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x43b/0x940 fs/read_write.c:584
ksys_write+0x147/0x250 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&obj_hash[i].lock);
lock(&trie->lock);
lock(&obj_hash[i].lock);
lock(&trie->lock);
*** DEADLOCK ***
10 locks held by syz.0.6077/21060:
#0: ffff8880216120c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2a3/0x330 fs/file.c:1042
#1: ffff88802ef68418 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x20e/0x940 fs/read_write.c:580
#2: ffff88801e393210 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#2: ffff88801e393210 (&sb->s_type->i_mutex_key#12){+.+.}-{3:3}, at: shmem_file_write_iter+0x82/0x120 mm/shmem.c:2874
#3: ffff8880485bc420 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
#3: ffff8880485bc420 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5358 [inline]
#3: ffff8880485bc420 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x300 mm/memory.c:5418
#4: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#4: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#4: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: netif_receive_skb_list_internal+0x4ad/0xc60 net/core/dev.c:5815
#5: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#5: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#5: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: ip_local_deliver_finish+0x1cb/0x510 net/ipv4/ip_input.c:232
#6: ffff888022fd2570 (slock-AF_INET/1){+.-.}-{2:2}, at: tcp_v4_rcv+0x22d9/0x2a50 net/ipv4/tcp_ipv4.c:2162
#7: ffff8880b8f2b958 (hrtimer_bases.lock){-.-.}-{2:2}, at: __run_hrtimer kernel/time/hrtimer.c:1759 [inline]
#7: ffff8880b8f2b958 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x5e3/0xc40 kernel/time/hrtimer.c:1819
#8: ffffffff9707b150 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x6c/0x4b0 lib/debugobjects.c:709
#9: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#9: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#9: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2321 [inline]
#9: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0xde/0x3c0 kernel/trace/bpf_trace.c:2361
stack backtrace:
CPU: 1 PID: 21060 Comm: syz.0.6077 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
trie_delete_elem+0x96/0x6a0 kernel/bpf/lpm_trie.c:467
bpf_prog_ae0c3e605f35524c+0x45/0x49
bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline]
__bpf_prog_run include/linux/filter.h:612 [inline]
bpf_prog_run include/linux/filter.h:619 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline]
bpf_trace_run2+0x1d1/0x3c0 kernel/trace/bpf_trace.c:2361
__bpf_trace_contention_end+0xdd/0x130 include/trace/events/lock.h:122
trace_contention_end+0xe6/0x110 include/trace/events/lock.h:122
__pv_queued_spin_lock_slowpath+0x7ec/0x9d0 kernel/locking/qspinlock.c:560
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:586 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x24e/0x2c0 kernel/locking/spinlock_debug.c:115
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xb4/0xf0 kernel/locking/spinlock.c:162
debug_object_activate+0x6c/0x4b0 lib/debugobjects.c:709
debug_hrtimer_activate kernel/time/hrtimer.c:450 [inline]
debug_activate kernel/time/hrtimer.c:505 [inline]
enqueue_hrtimer+0x30/0x370 kernel/time/hrtimer.c:1113
__run_hrtimer kernel/time/hrtimer.c:1772 [inline]
__hrtimer_run_queues+0x637/0xc40 kernel/time/hrtimer.c:1819
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1881
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:218 [inline]
RIP: 0010:unwind_next_frame+0x24c/0x2970 arch/x86/kernel/unwind_orc.c:494
Code: f8 4c 8d 2c 85 00 ca 71 8f 4c 89 e8 48 c1 e8 03 48 bb 00 00 00 00 00 fc ff df 0f b6 04 18 84 c0 0f 85 de 21 00 00 45 8b 6d 00 <44> 89 f8 ff c0 48 8d 2c 85 00 ca 71 8f 48 89 e8 48 c1 e8 03 0f b6
RSP: 0018:ffffc900001ef658 EFLAGS: 00000246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000100
RDX: ffff88802bb45a00 RSI: 00000000000769ba RDI: 000000000009a000
RBP: 000000000009a000 R08: ffffc900001ef7f0 R09: 0000000000000012
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc900001ef728
R13: 000000000015ad5a R14: ffffc900001ef75d R15: 00000000000769ba
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1806 [inline]
slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1832
slab_free mm/slub.c:3816 [inline]
kmem_cache_free+0xf8/0x280 mm/slub.c:3838
skb_kfree_head net/core/skbuff.c:943 [inline]
skb_free_head net/core/skbuff.c:957 [inline]
skb_release_data+0x60a/0x800 net/core/skbuff.c:987
skb_release_all net/core/skbuff.c:1053 [inline]
__kfree_skb+0x57/0x70 net/core/skbuff.c:1067
tcp_clean_rtx_queue net/ipv4/tcp_input.c:3444 [inline]
tcp_ack+0x1fb6/0x65e0 net/ipv4/tcp_input.c:4004
tcp_rcv_established+0xf23/0x1cf0 net/ipv4/tcp_input.c:6078
tcp_v4_do_rcv+0x4ed/0xb80 net/ipv4/tcp_ipv4.c:1734
tcp_v4_rcv+0x2334/0x2a50 net/ipv4/tcp_ipv4.c:2166
ip_protocol_deliver_rcu+0x20e/0x3f0 net/ipv4/ip_input.c:205
ip_local_deliver_finish+0x2ca/0x510 net/ipv4/ip_input.c:233
NF_HOOK+0x303/0x390 include/linux/netfilter.h:304
dst_input include/net/dst.h:477 [inline]
ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline]
ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline]
ip_sublist_rcv+0xa34/0xd20 net/ipv4/ip_input.c:639
ip_list_rcv+0x3e3/0x430 net/ipv4/ip_input.c:674
__netif_receive_skb_list_ptype net/core/dev.c:5639 [inline]
__netif_receive_skb_list_core+0x578/0x740 net/core/dev.c:5687
__netif_receive_skb_list net/core/dev.c:5739 [inline]
netif_receive_skb_list_internal+0x91b/0xc60 net/core/dev.c:5830
gro_normal_list include/net/gro.h:448 [inline]
napi_complete_done+0x32a/0x810 net/core/dev.c:6170
virtqueue_napi_complete drivers/net/virtio_net.c:450 [inline]
virtnet_poll+0xa44/0x1180 drivers/net/virtio_net.c:2231
__napi_poll+0xc0/0x460 net/core/dev.c:6600
napi_poll net/core/dev.c:6667 [inline]
net_rx_action+0x5ea/0xbf0 net/core/dev.c:6803
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
common_interrupt+0xb9/0xd0 arch/x86/kernel/irq.c:249
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:678
RIP: 0010:lock_is_held_type+0x13e/0x190 kernel/locking/lockdep.c:5830
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc900037f7838 EFLAGS: 00000206
RAX: 35149bebfc91d500 RBX: ffff88802bb45a00 RCX: 35149bebfc91d500
RDX: ffff88802bb45a00 RSI: ffffffff8aaacbc0 RDI: ffffffff8afc6780
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff21b46aa
R10: dffffc0000000000 R11: fffffbfff21b46ab R12: 0000000000000003
R13: 0000000000000246 R14: ffff8880485bc420 R15: ffff88802bb46558
lock_is_held include/linux/lockdep.h:288 [inline]
mmap_assert_locked include/linux/mmap_lock.h:65 [inline]
find_vma+0xad/0x1b0 mm/mmap.c:1883
lock_mm_and_find_vma+0x5f/0x300 mm/memory.c:5421
do_user_addr_fault+0x36c/0x12e0 arch/x86/mm/fault.c:1345
handle_page_fault arch/x86/mm/fault.c:1465 [inline]
exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0010:fault_in_readable+0xd0/0x160 mm/gup.c:1905
Code: c6 b4 bf ff 4d 89 f4 49 81 cc ff 0f 00 00 4d 89 f7 49 01 dc 49 81 e4 00 f0 ff ff 4d 39 e6 77 44 e8 a5 b4 bf ff 4d 39 e7 74 47 <41> 8a 07 88 44 24 07 49 81 c7 00 10 00 00 4d 39 e7 74 07 e8 88 b4
RSP: 0018:ffffc900037f7af0 EFLAGS: 00050287
RAX: ffffffff81c5e0eb RBX: 0000000000001000 RCX: 0000000000080000
RDX: ffffc9000d059000 RSI: 00000000000024b4 RDI: 00000000000024b5
RBP: dffffc0000000000 R08: ffff88802bb45a00 R09: 0000000000000002
R10: 0000000000000005 R11: 0000000000000002 R12: 000020000000d000
R13: 0000000000000000 R14: 000020000000b180 R15: 000020000000c000
fault_in_iov_iter_readable+0xbf/0x2e0 lib/iov_iter.c:216
generic_perform_write+0x1f2/0x5b0 mm/filemap.c:4006
shmem_file_write_iter+0xfb/0x120 mm/shmem.c:2884
call_write_iter include/linux/fs.h:2018 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x43b/0x940 fs/read_write.c:584
ksys_write+0x147/0x250 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f131058ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1311474038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f13107b5fa0 RCX: 00007f131058ebe9
RDX: 0000000000040010 RSI: 0000200000000180 RDI: 0000000000000007
RBP: 00007f1310611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f13107b6038 R14: 00007f13107b5fa0 R15: 00007ffc7bcd2948
----------------
Code disassembly (best guess):
0: f8 clc
1: 4c 8d 2c 85 00 ca 71 lea -0x708e3600(,%rax,4),%r13
8: 8f
9: 4c 89 e8 mov %r13,%rax
c: 48 c1 e8 03 shr $0x3,%rax
10: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx
17: fc ff df
1a: 0f b6 04 18 movzbl (%rax,%rbx,1),%eax
1e: 84 c0 test %al,%al
20: 0f 85 de 21 00 00 jne 0x2204
26: 45 8b 6d 00 mov 0x0(%r13),%r13d
* 2a: 44 89 f8 mov %r15d,%eax <-- trapping instruction
2d: ff c0 inc %eax
2f: 48 8d 2c 85 00 ca 71 lea -0x708e3600(,%rax,4),%rbp
36: 8f
37: 48 89 e8 mov %rbp,%rax
3a: 48 c1 e8 03 shr $0x3,%rax
3e: 0f .byte 0xf
3f: b6 .byte 0xb6