======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.5.1357/11580 is trying to acquire lock:
ffffffff8e9b0780 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:317 [inline]
ffffffff8e9b0780 (fs_reclaim){+.+.}-{0:0}, at: prepare_alloc_pages+0x166/0x5f0 mm/page_alloc.c:4995
but task is already holding lock:
ffff88801b726e60 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
ffff88801b726e60 (sk_lock-AF_INET6){+.+.}-{0:0}, at: tcp_recvmsg+0x11d/0x630 net/ipv4/tcp.c:2947
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #6 (sk_lock-AF_INET6){+.+.}-{0:0}:
lock_sock_nested+0x41/0xf0 net/core/sock.c:3783
lock_sock include/net/sock.h:1713 [inline]
inet_shutdown+0x67/0x410 net/ipv4/af_inet.c:915
nbd_mark_nsock_dead+0xae/0x5c0 drivers/block/nbd.c:318
recv_work+0x5fb/0x8c0 drivers/block/nbd.c:1021
process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
process_scheduled_works kernel/workqueue.c:3385 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #5 (&nsock->tx_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x1a4/0x1b10 kernel/locking/mutex.c:820
nbd_handle_cmd drivers/block/nbd.c:1143 [inline]
nbd_queue_rq+0x428/0x1080 drivers/block/nbd.c:1207
blk_mq_dispatch_rq_list+0x422/0x1e70 block/blk-mq.c:2148
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xcea/0x1620 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd7/0x1c0 block/blk-mq-sched.c:329
blk_mq_run_hw_queue+0x23c/0x670 block/blk-mq.c:2386
blk_mq_dispatch_list+0x51d/0x1360 block/blk-mq.c:2949
blk_mq_flush_plug_list block/blk-mq.c:2997 [inline]
blk_mq_flush_plug_list+0x130/0x600 block/blk-mq.c:2969
__blk_flush_plug+0x2c4/0x4b0 block/blk-core.c:1230
blk_finish_plug block/blk-core.c:1257 [inline]
__submit_bio+0x584/0x6c0 block/blk-core.c:649
__submit_bio_noacct_mq block/blk-core.c:722 [inline]
submit_bio_noacct_nocheck+0x543/0xbf0 block/blk-core.c:753
submit_bio_noacct+0xd18/0x2000 block/blk-core.c:884
blk_crypto_submit_bio include/linux/blk-crypto.h:203 [inline]
submit_bh_wbc+0x681/0x890 fs/buffer.c:2737
submit_bh fs/buffer.c:2742 [inline]
block_read_full_folio+0x4c8/0x8e0 fs/buffer.c:2358
filemap_read_folio+0xfc/0x3b0 mm/filemap.c:2502
do_read_cache_folio+0x2d7/0x6b0 mm/filemap.c:4107
read_mapping_folio include/linux/pagemap.h:1017 [inline]
read_part_sector+0xd1/0x370 block/partitions/core.c:724
adfspart_check_ICS+0x91/0x7d0 block/partitions/acorn.c:356
check_partition block/partitions/core.c:143 [inline]
blk_add_partitions block/partitions/core.c:591 [inline]
bdev_disk_changed+0x7a3/0x1250 block/partitions/core.c:695
blkdev_get_whole+0x187/0x290 block/bdev.c:756
bdev_open+0x2c7/0xe40 block/bdev.c:965
blkdev_open+0x34e/0x4f0 block/fops.c:697
do_dentry_open+0x6d8/0x1660 fs/open.c:947
vfs_open+0x82/0x3f0 fs/open.c:1079
do_open fs/namei.c:4699 [inline]
path_openat+0x208c/0x31a0 fs/namei.c:4858
do_file_open+0x20e/0x430 fs/namei.c:4887
do_sys_openat2+0x10d/0x1e0 fs/open.c:1364
do_sys_open fs/open.c:1370 [inline]
__do_sys_openat fs/open.c:1386 [inline]
__se_sys_openat fs/open.c:1381 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1381
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #4 (&cmd->lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x1a4/0x1b10 kernel/locking/mutex.c:820
nbd_queue_rq+0xba/0x1080 drivers/block/nbd.c:1199
blk_mq_dispatch_rq_list+0x422/0x1e70 block/blk-mq.c:2148
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xcea/0x1620 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd7/0x1c0 block/blk-mq-sched.c:329
blk_mq_run_hw_queue+0x23c/0x670 block/blk-mq.c:2386
blk_mq_dispatch_list+0x51d/0x1360 block/blk-mq.c:2949
blk_mq_flush_plug_list block/blk-mq.c:2997 [inline]
blk_mq_flush_plug_list+0x130/0x600 block/blk-mq.c:2969
__blk_flush_plug+0x2c4/0x4b0 block/blk-core.c:1230
blk_finish_plug block/blk-core.c:1257 [inline]
__submit_bio+0x584/0x6c0 block/blk-core.c:649
__submit_bio_noacct_mq block/blk-core.c:722 [inline]
submit_bio_noacct_nocheck+0x543/0xbf0 block/blk-core.c:753
submit_bio_noacct+0xd18/0x2000 block/blk-core.c:884
blk_crypto_submit_bio include/linux/blk-crypto.h:203 [inline]
submit_bh_wbc+0x681/0x890 fs/buffer.c:2737
submit_bh fs/buffer.c:2742 [inline]
block_read_full_folio+0x4c8/0x8e0 fs/buffer.c:2358
filemap_read_folio+0xfc/0x3b0 mm/filemap.c:2502
do_read_cache_folio+0x2d7/0x6b0 mm/filemap.c:4107
read_mapping_folio include/linux/pagemap.h:1017 [inline]
read_part_sector+0xd1/0x370 block/partitions/core.c:724
adfspart_check_ICS+0x91/0x7d0 block/partitions/acorn.c:356
check_partition block/partitions/core.c:143 [inline]
blk_add_partitions block/partitions/core.c:591 [inline]
bdev_disk_changed+0x7a3/0x1250 block/partitions/core.c:695
blkdev_get_whole+0x187/0x290 block/bdev.c:756
bdev_open+0x2c7/0xe40 block/bdev.c:965
blkdev_open+0x34e/0x4f0 block/fops.c:697
do_dentry_open+0x6d8/0x1660 fs/open.c:947
vfs_open+0x82/0x3f0 fs/open.c:1079
do_open fs/namei.c:4699 [inline]
path_openat+0x208c/0x31a0 fs/namei.c:4858
do_file_open+0x20e/0x430 fs/namei.c:4887
do_sys_openat2+0x10d/0x1e0 fs/open.c:1364
do_sys_open fs/open.c:1370 [inline]
__do_sys_openat fs/open.c:1386 [inline]
__se_sys_openat fs/open.c:1381 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1381
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #3 (set->srcu){.+.+}-{0:0}:
srcu_lock_sync include/linux/srcu.h:199 [inline]
__synchronize_srcu+0xa2/0x300 kernel/rcu/srcutree.c:1481
blk_mq_wait_quiesce_done block/blk-mq.c:284 [inline]
blk_mq_wait_quiesce_done block/blk-mq.c:281 [inline]
blk_mq_quiesce_queue block/blk-mq.c:304 [inline]
blk_mq_quiesce_queue+0x149/0x1c0 block/blk-mq.c:299
elevator_switch+0x17b/0x7e0 block/elevator.c:576
elevator_change+0x352/0x530 block/elevator.c:681
elevator_set_default+0x29e/0x360 block/elevator.c:754
blk_register_queue+0x48e/0x630 block/blk-sysfs.c:987
__add_disk+0x73f/0xe40 block/genhd.c:528
add_disk_fwnode+0x118/0x5c0 block/genhd.c:597
add_disk include/linux/blkdev.h:794 [inline]
nbd_dev_add+0x77a/0xb10 drivers/block/nbd.c:1984
nbd_init+0x291/0x2b0 drivers/block/nbd.c:2692
do_one_initcall+0x121/0x750 init/main.c:1392
do_initcall_level init/main.c:1454 [inline]
do_initcalls init/main.c:1470 [inline]
do_basic_setup init/main.c:1490 [inline]
kernel_init_freeable+0x6ea/0x7b0 init/main.c:1703
kernel_init+0x1f/0x1e0 init/main.c:1593
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #2 (&q->elevator_lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:646 [inline]
__mutex_lock+0x1a4/0x1b10 kernel/locking/mutex.c:820
elevator_change+0x1bc/0x530 block/elevator.c:679
elevator_set_none+0x92/0xf0 block/elevator.c:769
blk_mq_elv_switch_none block/blk-mq.c:5131 [inline]
__blk_mq_update_nr_hw_queues block/blk-mq.c:5176 [inline]
blk_mq_update_nr_hw_queues+0x4c1/0x15f0 block/blk-mq.c:5241
nbd_start_device+0x1a6/0xbd0 drivers/block/nbd.c:1489
nbd_genl_connect+0xff2/0x1a40 drivers/block/nbd.c:2239
genl_family_rcv_msg_doit+0x214/0x300 net/netlink/genetlink.c:1114
genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
genl_rcv_msg+0x560/0x800 net/netlink/genetlink.c:1209
netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2550
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:787 [inline]
__sock_sendmsg net/socket.c:802 [inline]
____sys_sendmsg+0x9e1/0xb70 net/socket.c:2698
___sys_sendmsg+0x190/0x1e0 net/socket.c:2752
__sys_sendmsg+0x170/0x220 net/socket.c:2784
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xe7/0x950 arch/x86/entry/syscall_32.c:307
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
-> #1 (&q->q_usage_counter(io)#49){++++}-{0:0}:
blk_alloc_queue+0x610/0x790 block/blk-core.c:461
blk_mq_alloc_queue+0x174/0x290 block/blk-mq.c:4450
__blk_mq_alloc_disk+0x29/0x120 block/blk-mq.c:4497
nbd_dev_add+0x492/0xb10 drivers/block/nbd.c:1954
nbd_init+0x291/0x2b0 drivers/block/nbd.c:2692
do_one_initcall+0x121/0x750 init/main.c:1392
do_initcall_level init/main.c:1454 [inline]
do_initcalls init/main.c:1470 [inline]
do_basic_setup init/main.c:1490 [inline]
kernel_init_freeable+0x6ea/0x7b0 init/main.c:1703
kernel_init+0x1f/0x1e0 init/main.c:1593
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #0 (fs_reclaim){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825
__fs_reclaim_acquire mm/page_alloc.c:4325 [inline]
fs_reclaim_acquire+0xc4/0x100 mm/page_alloc.c:4339
might_alloc include/linux/sched/mm.h:317 [inline]
prepare_alloc_pages+0x166/0x5f0 mm/page_alloc.c:4995
__alloc_frozen_pages_noprof+0x19a/0x2bc0 mm/page_alloc.c:5215
alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
vma_alloc_folio_noprof+0xed/0x1d0 mm/mempolicy.c:2544
folio_prealloc mm/memory.c:1191 [inline]
alloc_anon_folio mm/memory.c:5282 [inline]
do_anonymous_page+0xb46/0x2050 mm/memory.c:5376
do_pte_missing mm/memory.c:4548 [inline]
handle_pte_fault mm/memory.c:6411 [inline]
__handle_mm_fault+0x1d2c/0x2a00 mm/memory.c:6549
handle_mm_fault+0x36d/0xa20 mm/memory.c:6718
do_user_addr_fault+0x74c/0x12f0 arch/x86/mm/fault.c:1385
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline]
copy_to_user_iter lib/iov_iter.c:25 [inline]
iterate_ubuf include/linux/iov_iter.h:30 [inline]
iterate_and_advance2 include/linux/iov_iter.h:302 [inline]
iterate_and_advance include/linux/iov_iter.h:330 [inline]
_copy_to_iter+0x38c/0x1720 lib/iov_iter.c:197
copy_to_iter include/linux/uio.h:220 [inline]
simple_copy_to_iter+0x46/0x90 net/core/datagram.c:521
__skb_datagram_iter+0x5c8/0x900 net/core/datagram.c:435
skb_copy_datagram_iter+0xa5/0x270 net/core/datagram.c:535
skb_copy_datagram_msg include/linux/skbuff.h:4243 [inline]
tcp_recvmsg_locked+0x1b74/0x2a20 net/ipv4/tcp.c:2844
tcp_recvmsg+0x141/0x630 net/ipv4/tcp.c:2948
inet6_recvmsg+0xd5/0x4c0 net/ipv6/af_inet6.c:657
sock_recvmsg_nosec net/socket.c:1137 [inline]
sock_recvmsg+0xfe/0x1f0 net/socket.c:1159
sock_read_iter+0x2c6/0x3c0 net/socket.c:1229
new_sync_read fs/read_write.c:493 [inline]
vfs_read+0x957/0xb30 fs/read_write.c:574
ksys_read+0x1f8/0x250 fs/read_write.c:717
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xe7/0x950 arch/x86/entry/syscall_32.c:307
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
other info that might help us debug this:
Chain exists of:
fs_reclaim --> &nsock->tx_lock --> sk_lock-AF_INET6
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(sk_lock-AF_INET6);
lock(&nsock->tx_lock);
lock(sk_lock-AF_INET6);
lock(fs_reclaim);
*** DEADLOCK ***
2 locks held by syz.5.1357/11580:
#0: ffff88801b726e60 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
#0: ffff88801b726e60 (sk_lock-AF_INET6){+.+.}-{0:0}, at: tcp_recvmsg+0x11d/0x630 net/ipv4/tcp.c:2947
#1: ffff8880137758f8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:611 [inline]
#1: ffff8880137758f8 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:441 [inline]
#1: ffff8880137758f8 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x35/0x6f0 mm/mmap_lock.c:501
stack backtrace:
CPU: 1 UID: 0 PID: 11580 Comm: syz.5.1357 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043
check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825
__fs_reclaim_acquire mm/page_alloc.c:4325 [inline]
fs_reclaim_acquire+0xc4/0x100 mm/page_alloc.c:4339
might_alloc include/linux/sched/mm.h:317 [inline]
prepare_alloc_pages+0x166/0x5f0 mm/page_alloc.c:4995
__alloc_frozen_pages_noprof+0x19a/0x2bc0 mm/page_alloc.c:5215
alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
vma_alloc_folio_noprof+0xed/0x1d0 mm/mempolicy.c:2544
folio_prealloc mm/memory.c:1191 [inline]
alloc_anon_folio mm/memory.c:5282 [inline]
do_anonymous_page+0xb46/0x2050 mm/memory.c:5376
do_pte_missing mm/memory.c:4548 [inline]
handle_pte_fault mm/memory.c:6411 [inline]
__handle_mm_fault+0x1d2c/0x2a00 mm/memory.c:6549
handle_mm_fault+0x36d/0xa20 mm/memory.c:6718
do_user_addr_fault+0x74c/0x12f0 arch/x86/mm/fault.c:1385
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
RIP: 0010:raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline]
RIP: 0010:copy_to_user_iter lib/iov_iter.c:25 [inline]
RIP: 0010:iterate_ubuf include/linux/iov_iter.h:30 [inline]
RIP: 0010:iterate_and_advance2 include/linux/iov_iter.h:302 [inline]
RIP: 0010:iterate_and_advance include/linux/iov_iter.h:330 [inline]
RIP: 0010:_copy_to_iter+0x38c/0x1720 lib/iov_iter.c:197
Code: 00 00 00 00 e9 4d ff ff ff e8 e0 55 13 fd 4c 8b 74 24 18 44 89 fe 4c 89 f7 e8 a0 1e 80 fd 0f 01 cb 4c 89 f9 48 89 df 4c 89 f6 <f3> a4 0f 1f 00 48 89 cb 0f 01 ca 4c 89 f8 48 29 c8 48 89 44 24 08
RSP: 0018:ffffc90004ef7708 EFLAGS: 00050246
RAX: 0000000000000001 RBX: 00000000800075c0 RCX: 0000000000000002
RDX: 0000000000000001 RSI: ffff88804dbd8000 RDI: 00000000800075c0
RBP: ffffc90004ef7c38 R08: 0000000000000000 R09: ffffed1009b7b000
R10: ffff88804dbd8001 R11: 0000000000000000 R12: 00000000800075c2
R13: 00007ffffffff000 R14: ffff88804dbd8000 R15: 0000000000000002
copy_to_iter include/linux/uio.h:220 [inline]
simple_copy_to_iter+0x46/0x90 net/core/datagram.c:521
__skb_datagram_iter+0x5c8/0x900 net/core/datagram.c:435
skb_copy_datagram_iter+0xa5/0x270 net/core/datagram.c:535
skb_copy_datagram_msg include/linux/skbuff.h:4243 [inline]
tcp_recvmsg_locked+0x1b74/0x2a20 net/ipv4/tcp.c:2844
tcp_recvmsg+0x141/0x630 net/ipv4/tcp.c:2948
inet6_recvmsg+0xd5/0x4c0 net/ipv6/af_inet6.c:657
sock_recvmsg_nosec net/socket.c:1137 [inline]
sock_recvmsg+0xfe/0x1f0 net/socket.c:1159
sock_read_iter+0x2c6/0x3c0 net/socket.c:1229
new_sync_read fs/read_write.c:493 [inline]
vfs_read+0x957/0xb30 fs/read_write.c:574
ksys_read+0x1f8/0x250 fs/read_write.c:717
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xe7/0x950 arch/x86/entry/syscall_32.c:307
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf6ffefcc
Code: d2 74 05 c1 e8 0c 89 02 8b 5d fc 31 c0 c9 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 2e 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 58 b8
RSP: 002b:00000000f53ed50c EFLAGS: 00000292 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000800075c0
RDX: 0000000000002020 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
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Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 00 add %al,(%rax)
4: e9 4d ff ff ff jmp 0xffffff56
9: e8 e0 55 13 fd call 0xfd1355ee
e: 4c 8b 74 24 18 mov 0x18(%rsp),%r14
13: 44 89 fe mov %r15d,%esi
16: 4c 89 f7 mov %r14,%rdi
19: e8 a0 1e 80 fd call 0xfd801ebe
1e: 0f 01 cb stac
21: 4c 89 f9 mov %r15,%rcx
24: 48 89 df mov %rbx,%rdi
27: 4c 89 f6 mov %r14,%rsi
* 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction
2c: 0f 1f 00 nopl (%rax)
2f: 48 89 cb mov %rcx,%rbx
32: 0f 01 ca clac
35: 4c 89 f8 mov %r15,%rax
38: 48 29 c8 sub %rcx,%rax
3b: 48 89 44 24 08 mov %rax,0x8(%rsp)