I/O error, dev nbd1, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev nbd1, logical block 0, async page read
 nbd1: unable to read partition table
======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc1-syzkaller-g2014c95afece #0 Not tainted
------------------------------------------------------
syz.1.513/7296 is trying to acquire lock:
ff60000019d9c0c0 (&q->q_usage_counter(io)#20){++++}-{0:0}, at: __submit_bio+0x37e/0x5a8 block/blk-core.c:628

but task is already holding lock:
ff60000015886548 (mapping.invalidate_lock#3){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:920 [inline]
ff60000015886548 (mapping.invalidate_lock#3){++++}-{4:4}, at: filemap_update_page mm/filemap.c:2440 [inline]
ff60000015886548 (mapping.invalidate_lock#3){++++}-{4:4}, at: filemap_get_pages+0x484/0x1cf6 mm/filemap.c:2602

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #7 (mapping.invalidate_lock#3){++++}-{4:4}:
       lock_acquire kernel/locking/lockdep.c:5851 [inline]
       lock_acquire+0x36a/0xb7c kernel/locking/lockdep.c:5816
       down_read+0xa4/0x45e kernel/locking/rwsem.c:1524
       filemap_invalidate_lock_shared include/linux/fs.h:920 [inline]
       filemap_fault+0x18b0/0x2c36 mm/filemap.c:3454
       __do_fault+0xf4/0x3d8 mm/memory.c:4977
       do_read_fault mm/memory.c:5392 [inline]
       do_fault mm/memory.c:5526 [inline]
       do_pte_missing mm/memory.c:4047 [inline]
       handle_pte_fault mm/memory.c:5889 [inline]
       __handle_mm_fault+0x1c0c/0x4150 mm/memory.c:6032
       handle_mm_fault+0x48c/0x886 mm/memory.c:6201
       faultin_page mm/gup.c:1196 [inline]
       __get_user_pages+0xabe/0x31f4 mm/gup.c:1491
       populate_vma_page_range+0x24a/0x362 mm/gup.c:1929
       __mm_populate+0x1a8/0x390 mm/gup.c:2032
       do_mlock+0x436/0x814 mm/mlock.c:653
       __do_sys_mlock mm/mlock.c:661 [inline]
       __se_sys_mlock mm/mlock.c:659 [inline]
       __riscv_sys_mlock+0x54/0x74 mm/mlock.c:659
       syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
       do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
       handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

-> #6 (&mm->mmap_lock){++++}-{4:4}:
       lock_acquire kernel/locking/lockdep.c:5851 [inline]
       lock_acquire+0x36a/0xb7c kernel/locking/lockdep.c:5816
       __might_fault mm/memory.c:6840 [inline]
       __might_fault+0xdc/0x138 mm/memory.c:6833
       _copy_from_iter+0x120/0x1a32 lib/iov_iter.c:259
       copy_from_iter include/linux/uio.h:228 [inline]
       copy_from_iter_full include/linux/uio.h:245 [inline]
       skb_do_copy_data_nocache include/net/sock.h:2196 [inline]
       skb_copy_to_page_nocache include/net/sock.h:2222 [inline]
       tcp_sendmsg_locked+0x24b6/0x36ce net/ipv4/tcp.c:1222
       tcp_sendmsg+0x32/0x4e net/ipv4/tcp.c:1358
       inet_sendmsg+0x9c/0xda net/ipv4/af_inet.c:851
       sock_sendmsg_nosec net/socket.c:713 [inline]
       __sock_sendmsg+0xcc/0x160 net/socket.c:728
       sock_write_iter+0x2a0/0x3ba net/socket.c:1132
       new_sync_write fs/read_write.c:586 [inline]
       vfs_write+0x56c/0xa9a fs/read_write.c:679
       ksys_write+0x200/0x226 fs/read_write.c:731
       __do_sys_write fs/read_write.c:742 [inline]
       __se_sys_write fs/read_write.c:739 [inline]
       __riscv_sys_write+0x6e/0x94 fs/read_write.c:739
       syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
       do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
       handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

-> #5 (sk_lock-AF_INET){+.+.}-{0:0}:
       lock_acquire kernel/locking/lockdep.c:5851 [inline]
       lock_acquire+0x36a/0xb7c kernel/locking/lockdep.c:5816
       lock_sock_nested+0x38/0xf6 net/core/sock.c:3645
       lock_sock include/net/sock.h:1624 [inline]
       inet_shutdown+0x6c/0x41c net/ipv4/af_inet.c:905
       kernel_sock_shutdown+0x58/0x7a net/socket.c:3655
       nbd_mark_nsock_dead+0xb4/0x520 drivers/block/nbd.c:318
       sock_shutdown+0x150/0x234 drivers/block/nbd.c:411
       nbd_start_device_ioctl drivers/block/nbd.c:1537 [inline]
       __nbd_ioctl drivers/block/nbd.c:1602 [inline]
       nbd_ioctl+0x9b8/0xb98 drivers/block/nbd.c:1642
       blkdev_ioctl+0x23c/0xca0 block/ioctl.c:693
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:906 [inline]
       __se_sys_ioctl fs/ioctl.c:892 [inline]
       __riscv_sys_ioctl+0x18e/0x1e2 fs/ioctl.c:892
       syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
       do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
       handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

-> #4 (&nsock->tx_lock){+.+.}-{4:4}:
       lock_acquire kernel/locking/lockdep.c:5851 [inline]
       lock_acquire+0x36a/0xb7c kernel/locking/lockdep.c:5816
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x166/0x1230 kernel/locking/mutex.c:730
       mutex_lock_nested+0x14/0x1c kernel/locking/mutex.c:782
       nbd_handle_cmd drivers/block/nbd.c:1140 [inline]
       nbd_queue_rq+0x3b8/0xe6a drivers/block/nbd.c:1204
       blk_mq_dispatch_rq_list+0x3f0/0x1ab6 block/blk-mq.c:2120
       __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline]
       blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline]
       __blk_mq_sched_dispatch_requests+0xaee/0x1370 block/blk-mq-sched.c:309
       blk_mq_sched_dispatch_requests+0xb6/0x17c block/blk-mq-sched.c:331
       blk_mq_run_hw_queue+0x284/0x6b2 block/blk-mq.c:2354
       blk_mq_dispatch_plug_list block/blk-mq.c:2866 [inline]
       blk_mq_flush_plug_list+0x63c/0x1eb2 block/blk-mq.c:2917
       __blk_flush_plug+0x270/0x422 block/blk-core.c:1213
       blk_finish_plug block/blk-core.c:1240 [inline]
       blk_finish_plug block/blk-core.c:1237 [inline]
       __submit_bio+0x4a0/0x5a8 block/blk-core.c:642
       __submit_bio_noacct_mq block/blk-core.c:715 [inline]
       submit_bio_noacct_nocheck+0x740/0xe36 block/blk-core.c:744
       submit_bio_noacct+0x9f4/0x1e04 block/blk-core.c:867
       submit_bio+0xc8/0x4f4 block/blk-core.c:909
       submit_bh_wbc+0x42a/0x5a8 fs/buffer.c:2814
       submit_bh fs/buffer.c:2819 [inline]
       block_read_full_folio+0x6e6/0x90a fs/buffer.c:2446
       blkdev_read_folio+0x26/0x30 block/fops.c:467
       filemap_read_folio+0xc2/0x272 mm/filemap.c:2390
       do_read_cache_folio+0x1e6/0x4d2 mm/filemap.c:3960
       read_cache_folio+0x4e/0x68 mm/filemap.c:3992
       read_mapping_folio include/linux/pagemap.h:1023 [inline]
       read_part_sector+0xc0/0x44c block/partitions/core.c:722
       read_lba+0x1c8/0x344 block/partitions/efi.c:248
       find_valid_gpt.constprop.0+0x206/0x22f2 block/partitions/efi.c:603
       efi_partition+0x10a/0xa14 block/partitions/efi.c:720
       check_partition block/partitions/core.c:141 [inline]
       blk_add_partitions block/partitions/core.c:589 [inline]
       bdev_disk_changed+0x5de/0x139c block/partitions/core.c:693
       blkdev_get_whole+0x17c/0x514 block/bdev.c:706
       bdev_open+0x86a/0xfa8 block/bdev.c:915
       blkdev_open+0x254/0x3a8 block/fops.c:652
       do_dentry_open+0x97e/0x171e fs/open.c:955
       vfs_open+0xbe/0x380 fs/open.c:1085
       do_open fs/namei.c:3830 [inline]
       path_openat+0x1b96/0x28e8 fs/namei.c:3989
       do_filp_open+0x19c/0x35c fs/namei.c:4016
       do_sys_openat2+0x174/0x1ca fs/open.c:1427
       do_sys_open fs/open.c:1442 [inline]
       __do_sys_openat fs/open.c:1458 [inline]
       __se_sys_openat fs/open.c:1453 [inline]
       __riscv_sys_openat+0x178/0x1fe fs/open.c:1453
       syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
       do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
       handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

-> #3 (&cmd->lock){+.+.}-{4:4}:
       lock_acquire kernel/locking/lockdep.c:5851 [inline]
       lock_acquire+0x36a/0xb7c kernel/locking/lockdep.c:5816
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x166/0x1230 kernel/locking/mutex.c:730
       mutex_lock_nested+0x14/0x1c kernel/locking/mutex.c:782
       nbd_queue_rq+0xbc/0xe6a drivers/block/nbd.c:1196
       blk_mq_dispatch_rq_list+0x3f0/0x1ab6 block/blk-mq.c:2120
       __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline]
       blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline]
       __blk_mq_sched_dispatch_requests+0xaee/0x1370 block/blk-mq-sched.c:309
       blk_mq_sched_dispatch_requests+0xb6/0x17c block/blk-mq-sched.c:331
       blk_mq_run_hw_queue+0x284/0x6b2 block/blk-mq.c:2354
       blk_mq_dispatch_plug_list block/blk-mq.c:2866 [inline]
       blk_mq_flush_plug_list+0x63c/0x1eb2 block/blk-mq.c:2917
       __blk_flush_plug+0x270/0x422 block/blk-core.c:1213
       blk_finish_plug block/blk-core.c:1240 [inline]
       blk_finish_plug block/blk-core.c:1237 [inline]
       __submit_bio+0x4a0/0x5a8 block/blk-core.c:642
       __submit_bio_noacct_mq block/blk-core.c:715 [inline]
       submit_bio_noacct_nocheck+0x740/0xe36 block/blk-core.c:744
       submit_bio_noacct+0x9f4/0x1e04 block/blk-core.c:867
       submit_bio+0xc8/0x4f4 block/blk-core.c:909
       submit_bh_wbc+0x42a/0x5a8 fs/buffer.c:2814
       submit_bh fs/buffer.c:2819 [inline]
       block_read_full_folio+0x6e6/0x90a fs/buffer.c:2446
       blkdev_read_folio+0x26/0x30 block/fops.c:467
       filemap_read_folio+0xc2/0x272 mm/filemap.c:2390
       do_read_cache_folio+0x1e6/0x4d2 mm/filemap.c:3960
       read_cache_folio+0x4e/0x68 mm/filemap.c:3992
       read_mapping_folio include/linux/pagemap.h:1023 [inline]
       read_part_sector+0xc0/0x44c block/partitions/core.c:722
       read_lba+0x1c8/0x344 block/partitions/efi.c:248
       find_valid_gpt.constprop.0+0x206/0x22f2 block/partitions/efi.c:603
       efi_partition+0x10a/0xa14 block/partitions/efi.c:720
       check_partition block/partitions/core.c:141 [inline]
       blk_add_partitions block/partitions/core.c:589 [inline]
       bdev_disk_changed+0x5de/0x139c block/partitions/core.c:693
       blkdev_get_whole+0x17c/0x514 block/bdev.c:706
       bdev_open+0x86a/0xfa8 block/bdev.c:915
       blkdev_open+0x254/0x3a8 block/fops.c:652
       do_dentry_open+0x97e/0x171e fs/open.c:955
       vfs_open+0xbe/0x380 fs/open.c:1085
       do_open fs/namei.c:3830 [inline]
       path_openat+0x1b96/0x28e8 fs/namei.c:3989
       do_filp_open+0x19c/0x35c fs/namei.c:4016
       do_sys_openat2+0x174/0x1ca fs/open.c:1427
       do_sys_open fs/open.c:1442 [inline]
       __do_sys_openat fs/open.c:1458 [inline]
       __se_sys_openat fs/open.c:1453 [inline]
       __riscv_sys_openat+0x178/0x1fe fs/open.c:1453
       syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
       do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
       handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

-> #2 (set->srcu){.+.+}-{0:0}:
       lock_sync+0x286/0x504 kernel/locking/lockdep.c:5899
       srcu_lock_sync include/linux/srcu.h:176 [inline]
       __synchronize_srcu+0xd4/0x292 kernel/rcu/srcutree.c:1418
       synchronize_srcu_expedited kernel/rcu/srcutree.c:1458 [inline]
       synchronize_srcu+0x172/0x414 kernel/rcu/srcutree.c:1513
       blk_mq_wait_quiesce_done block/blk-mq.c:293 [inline]
       blk_mq_wait_quiesce_done block/blk-mq.c:290 [inline]
       blk_mq_quiesce_queue block/blk-mq.c:313 [inline]
       blk_mq_quiesce_queue+0x126/0x196 block/blk-mq.c:308
       elevator_disable+0xb8/0x27c block/elevator.c:661
       blk_mq_elv_switch_none block/blk-mq.c:4951 [inline]
       __blk_mq_update_nr_hw_queues block/blk-mq.c:5018 [inline]
       blk_mq_update_nr_hw_queues+0x394/0x113c block/blk-mq.c:5070
       nbd_start_device+0x140/0xb2c drivers/block/nbd.c:1476
       nbd_start_device_ioctl drivers/block/nbd.c:1527 [inline]
       __nbd_ioctl drivers/block/nbd.c:1602 [inline]
       nbd_ioctl+0x474/0xb98 drivers/block/nbd.c:1642
       blkdev_ioctl+0x23c/0xca0 block/ioctl.c:693
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:906 [inline]
       __se_sys_ioctl fs/ioctl.c:892 [inline]
       __riscv_sys_ioctl+0x18e/0x1e2 fs/ioctl.c:892
       syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
       do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
       handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

-> #1 (&q->sysfs_lock){+.+.}-{4:4}:
       lock_acquire kernel/locking/lockdep.c:5851 [inline]
       lock_acquire+0x36a/0xb7c kernel/locking/lockdep.c:5816
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x166/0x1230 kernel/locking/mutex.c:730
       mutex_lock_nested+0x14/0x1c kernel/locking/mutex.c:782
       blk_mq_elv_switch_none block/blk-mq.c:4937 [inline]
       __blk_mq_update_nr_hw_queues block/blk-mq.c:5018 [inline]
       blk_mq_update_nr_hw_queues+0x414/0x113c block/blk-mq.c:5070
       nbd_start_device+0x140/0xb2c drivers/block/nbd.c:1476
       nbd_start_device_ioctl drivers/block/nbd.c:1527 [inline]
       __nbd_ioctl drivers/block/nbd.c:1602 [inline]
       nbd_ioctl+0x474/0xb98 drivers/block/nbd.c:1642
       blkdev_ioctl+0x23c/0xca0 block/ioctl.c:693
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:906 [inline]
       __se_sys_ioctl fs/ioctl.c:892 [inline]
       __riscv_sys_ioctl+0x18e/0x1e2 fs/ioctl.c:892
       syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
       do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
       handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

-> #0 (&q->q_usage_counter(io)#20){++++}-{0:0}:
       check_noncircular+0x2ba/0x354 kernel/locking/lockdep.c:2208
       check_prev_add kernel/locking/lockdep.c:3163 [inline]
       check_prevs_add kernel/locking/lockdep.c:3282 [inline]
       validate_chain kernel/locking/lockdep.c:3906 [inline]
       __lock_acquire+0x2e4e/0x8594 kernel/locking/lockdep.c:5228
       lock_acquire kernel/locking/lockdep.c:5851 [inline]
       lock_acquire+0x36a/0xb7c kernel/locking/lockdep.c:5816
       bio_queue_enter block/blk.h:77 [inline]
       blk_mq_submit_bio+0x2210/0x280c block/blk-mq.c:3091
       __submit_bio+0x37e/0x5a8 block/blk-core.c:628
       __submit_bio_noacct_mq block/blk-core.c:715 [inline]
       submit_bio_noacct_nocheck+0x740/0xe36 block/blk-core.c:744
       submit_bio_noacct+0x9f4/0x1e04 block/blk-core.c:867
       submit_bio+0xc8/0x4f4 block/blk-core.c:909
       submit_bh_wbc+0x42a/0x5a8 fs/buffer.c:2814
       submit_bh fs/buffer.c:2819 [inline]
       block_read_full_folio+0x6e6/0x90a fs/buffer.c:2446
       blkdev_read_folio+0x26/0x30 block/fops.c:467
       filemap_read_folio+0xc2/0x272 mm/filemap.c:2390
       filemap_update_page mm/filemap.c:2474 [inline]
       filemap_get_pages+0xece/0x1cf6 mm/filemap.c:2602
       filemap_read+0x366/0xdca mm/filemap.c:2691
       blkdev_read_iter+0x164/0x446 block/fops.c:796
       do_iter_readv_writev+0x5d4/0x70e fs/read_write.c:818
       vfs_readv+0x416/0x718 fs/read_write.c:1011
       do_preadv+0x1b4/0x250 fs/read_write.c:1125
       __do_sys_preadv fs/read_write.c:1172 [inline]
       __se_sys_preadv fs/read_write.c:1167 [inline]
       __riscv_sys_preadv+0x88/0xc4 fs/read_write.c:1167
       syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
       do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
       handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197

other info that might help us debug this:

Chain exists of:
  &q->q_usage_counter(io)#20 --> &mm->mmap_lock --> mapping.invalidate_lock#3

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(mapping.invalidate_lock#3);
                               lock(&mm->mmap_lock);
                               lock(mapping.invalidate_lock#3);
  rlock(&q->q_usage_counter(io)#20);

 *** DEADLOCK ***

1 lock held by syz.1.513/7296:
 #0: ff60000015886548 (mapping.invalidate_lock#3){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:920 [inline]
 #0: ff60000015886548 (mapping.invalidate_lock#3){++++}-{4:4}, at: filemap_update_page mm/filemap.c:2440 [inline]
 #0: ff60000015886548 (mapping.invalidate_lock#3){++++}-{4:4}, at: filemap_get_pages+0x484/0x1cf6 mm/filemap.c:2602

stack backtrace:
CPU: 0 UID: 0 PID: 7296 Comm: syz.1.513 Not tainted 6.14.0-rc1-syzkaller-g2014c95afece #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff80072526>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132
[<ffffffff80003206>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138
[<ffffffff8005e0c4>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff8005e0c4>] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120
[<ffffffff8005e158>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff802b50a8>] print_circular_bug+0x3a2/0x42c kernel/locking/lockdep.c:2076
[<ffffffff802b53ec>] check_noncircular+0x2ba/0x354 kernel/locking/lockdep.c:2208
[<ffffffff802bd108>] check_prev_add kernel/locking/lockdep.c:3163 [inline]
[<ffffffff802bd108>] check_prevs_add kernel/locking/lockdep.c:3282 [inline]
[<ffffffff802bd108>] validate_chain kernel/locking/lockdep.c:3906 [inline]
[<ffffffff802bd108>] __lock_acquire+0x2e4e/0x8594 kernel/locking/lockdep.c:5228
[<ffffffff802c4c96>] lock_acquire kernel/locking/lockdep.c:5851 [inline]
[<ffffffff802c4c96>] lock_acquire+0x36a/0xb7c kernel/locking/lockdep.c:5816
[<ffffffff8145b7b2>] bio_queue_enter block/blk.h:77 [inline]
[<ffffffff8145b7b2>] blk_mq_submit_bio+0x2210/0x280c block/blk-mq.c:3091
[<ffffffff8141713a>] __submit_bio+0x37e/0x5a8 block/blk-core.c:628
[<ffffffff81417aa4>] __submit_bio_noacct_mq block/blk-core.c:715 [inline]
[<ffffffff81417aa4>] submit_bio_noacct_nocheck+0x740/0xe36 block/blk-core.c:744
[<ffffffff81418b8e>] submit_bio_noacct+0x9f4/0x1e04 block/blk-core.c:867
[<ffffffff8141a066>] submit_bio+0xc8/0x4f4 block/blk-core.c:909
[<ffffffff80bf1370>] submit_bh_wbc+0x42a/0x5a8 fs/buffer.c:2814
[<ffffffff80bfa138>] submit_bh fs/buffer.c:2819 [inline]
[<ffffffff80bfa138>] block_read_full_folio+0x6e6/0x90a fs/buffer.c:2446
[<ffffffff813f44f6>] blkdev_read_folio+0x26/0x30 block/fops.c:467
[<ffffffff8079e178>] filemap_read_folio+0xc2/0x272 mm/filemap.c:2390
[<ffffffff807a4c8a>] filemap_update_page mm/filemap.c:2474 [inline]
[<ffffffff807a4c8a>] filemap_get_pages+0xece/0x1cf6 mm/filemap.c:2602
[<ffffffff807a5e18>] filemap_read+0x366/0xdca mm/filemap.c:2691
[<ffffffff813f80ec>] blkdev_read_iter+0x164/0x446 block/fops.c:796
[<ffffffff80ad2154>] do_iter_readv_writev+0x5d4/0x70e fs/read_write.c:818
[<ffffffff80ad33c4>] vfs_readv+0x416/0x718 fs/read_write.c:1011
[<ffffffff80ad3b80>] do_preadv+0x1b4/0x250 fs/read_write.c:1125
[<ffffffff80ada272>] __do_sys_preadv fs/read_write.c:1172 [inline]
[<ffffffff80ada272>] __se_sys_preadv fs/read_write.c:1167 [inline]
[<ffffffff80ada272>] __riscv_sys_preadv+0x88/0xc4 fs/read_write.c:1167
[<ffffffff80070b2c>] syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90
[<ffffffff861aecda>] do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331
[<ffffffff861d41ea>] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197
I/O error, dev nbd1, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev nbd1, logical block 0, async page read