======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.2.4585/16362 is trying to acquire lock:
ffffffff8ea85520 (fs_reclaim){+.+.}-{0:0}, at: prepare_alloc_pages+0x152/0x650

but task is already holding lock:
ffff8881b89daa90 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_fault+0x95e/0x1300

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #9 (mapping.invalidate_lock#2){++++}-{4:4}:
       down_read+0x47/0x2e0
       filemap_fault+0x666/0x1300
       __do_fault+0x138/0x2a0
       do_pte_missing+0x601/0x33f0
       handle_mm_fault+0x1bd7/0x3170
       do_user_addr_fault+0xa73/0x1340
       exc_page_fault+0x6a/0xc0
       asm_exc_page_fault+0x26/0x30

-> #8 (vm_lock){++++}-{0:0}:
       __vma_start_exclude_readers+0x28a/0x940
       __vma_start_write+0xdc/0x290
       mprotect_fixup+0x785/0xb60
       setup_arg_pages+0x664/0xbd0
       load_elf_binary+0xc5e/0x2980
       bprm_execve+0x94a/0x1440
       kernel_execve+0x844/0x930
       try_to_run_init_process+0x13/0x60
       kernel_init+0xad/0x1d0
       ret_from_fork+0x514/0xb70
       ret_from_fork_asm+0x1a/0x30

-> #7 (&mm->mmap_lock){++++}-{4:4}:
       __might_fault+0xcb/0x130
       _copy_from_user+0x28/0xb0
       csum_and_copy_from_iter_full+0x1e7/0x1f00
       ip_generic_getfrag+0x149/0x2d0
       __ip6_append_data+0x39cd/0x3f60
       ip6_append_data+0x10f/0x280
       rawv6_sendmsg+0x12d3/0x18e0
       ____sys_sendmsg+0x80a/0x9f0
       ___sys_sendmsg+0x2a5/0x360
       __x64_sys_sendmsg+0x1bd/0x2a0
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #6 (sk_lock-AF_INET6){+.+.}-{0:0}:
       lock_sock_nested+0x41/0x100
       inet_shutdown+0x6a/0x390
       nbd_mark_nsock_dead+0x2e9/0x560
       recv_work+0x1c2e/0x1d40
       process_scheduled_works+0xb5d/0x1860
       worker_thread+0xa53/0xfc0
       kthread+0x388/0x470
       ret_from_fork+0x514/0xb70
       ret_from_fork_asm+0x1a/0x30

-> #5 (&nsock->tx_lock){+.+.}-{4:4}:
       __mutex_lock+0x1a3/0x1550
       nbd_queue_rq+0x37b/0x1100
       blk_mq_dispatch_rq_list+0xa70/0x1910
       __blk_mq_sched_dispatch_requests+0xdcc/0x1600
       blk_mq_sched_dispatch_requests+0xd7/0x190
       blk_mq_run_hw_queue+0x348/0x4f0
       blk_mq_dispatch_list+0xd16/0xe10
       blk_mq_flush_plug_list+0x48d/0x570
       __blk_flush_plug+0x3ed/0x4d0
       __submit_bio+0x28d/0x580
       submit_bio_noacct_nocheck+0x2f4/0xa40
       block_read_full_folio+0x599/0x830
       filemap_read_folio+0x137/0x3b0
       do_read_cache_folio+0x358/0x590
       read_part_sector+0xb6/0x2b0
       adfspart_check_ICS+0xb1/0x960
       bdev_disk_changed+0x817/0x1770
       blkdev_get_whole+0x380/0x510
       bdev_open+0x31e/0xd30
       blkdev_open+0x470/0x610
       do_dentry_open+0x785/0x14e0
       vfs_open+0x3b/0x340
       path_openat+0x2e08/0x3860
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #4 (&cmd->lock){+.+.}-{4:4}:
       __mutex_lock+0x1a3/0x1550
       nbd_queue_rq+0xc6/0x1100
       blk_mq_dispatch_rq_list+0xa70/0x1910
       __blk_mq_sched_dispatch_requests+0xdcc/0x1600
       blk_mq_sched_dispatch_requests+0xd7/0x190
       blk_mq_run_hw_queue+0x348/0x4f0
       blk_mq_dispatch_list+0xd16/0xe10
       blk_mq_flush_plug_list+0x48d/0x570
       __blk_flush_plug+0x3ed/0x4d0
       __submit_bio+0x28d/0x580
       submit_bio_noacct_nocheck+0x2f4/0xa40
       block_read_full_folio+0x599/0x830
       filemap_read_folio+0x137/0x3b0
       do_read_cache_folio+0x358/0x590
       read_part_sector+0xb6/0x2b0
       adfspart_check_ICS+0xb1/0x960
       bdev_disk_changed+0x817/0x1770
       blkdev_get_whole+0x380/0x510
       bdev_open+0x31e/0xd30
       blkdev_open+0x470/0x610
       do_dentry_open+0x785/0x14e0
       vfs_open+0x3b/0x340
       path_openat+0x2e08/0x3860
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #3 (set->srcu){.+.+}-{0:0}:
       __synchronize_srcu+0xca/0x300
       elevator_switch+0x1e8/0x7a0
       elevator_change+0x2cc/0x450
       elevator_set_default+0x36c/0x430
       blk_register_queue+0x3e9/0x4e0
       __add_disk+0x677/0xd50
       add_disk_fwnode+0xfb/0x480
       nbd_dev_add+0x72c/0xb50
       nbd_init+0x168/0x1f0
       do_one_initcall+0x250/0x870
       do_initcall_level+0x104/0x190
       do_initcalls+0x59/0xa0
       kernel_init_freeable+0x2a6/0x3e0
       kernel_init+0x1d/0x1d0
       ret_from_fork+0x514/0xb70
       ret_from_fork_asm+0x1a/0x30

-> #2 (&q->elevator_lock){+.+.}-{4:4}:
       __mutex_lock+0x1a3/0x1550
       elevator_change+0x1b3/0x450
       elevator_set_none+0xb5/0x140
       blk_mq_update_nr_hw_queues+0x5e7/0x1a60
       nbd_start_device+0x17f/0xb10
       nbd_genl_connect+0x165b/0x1cf0
       genl_family_rcv_msg_doit+0x22a/0x330
       genl_rcv_msg+0x61c/0x7a0
       netlink_rcv_skb+0x232/0x4b0
       genl_rcv+0x28/0x40
       netlink_unicast+0x75c/0x8e0
       netlink_sendmsg+0x813/0xb40
       ____sys_sendmsg+0x972/0x9f0
       ___sys_sendmsg+0x2a5/0x360
       __x64_sys_sendmsg+0x1bd/0x2a0
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&q->q_usage_counter(io)#49){++++}-{0:0}:
       blk_alloc_queue+0x546/0x680
       __blk_mq_alloc_disk+0x197/0x390
       nbd_dev_add+0x499/0xb50
       nbd_init+0x168/0x1f0
       do_one_initcall+0x250/0x870
       do_initcall_level+0x104/0x190
       do_initcalls+0x59/0xa0
       kernel_init_freeable+0x2a6/0x3e0
       kernel_init+0x1d/0x1d0
       ret_from_fork+0x514/0xb70
       ret_from_fork_asm+0x1a/0x30

-> #0 (fs_reclaim){+.+.}-{0:0}:
       __lock_acquire+0x15a5/0x2cf0
       lock_acquire+0x106/0x350
       fs_reclaim_acquire+0x71/0x100
       prepare_alloc_pages+0x152/0x650
       __alloc_frozen_pages_noprof+0x12f/0x380
       alloc_pages_mpol+0x235/0x490
       alloc_pages_noprof+0xac/0x2a0
       folio_alloc_noprof+0x1e/0x30
       filemap_alloc_folio_noprof+0x111/0x470
       __filemap_get_folio_mpol+0x3fc/0xb00
       filemap_fault+0x98e/0x1300
       __do_fault+0x138/0x2a0
       do_pte_missing+0x601/0x33f0
       handle_mm_fault+0x1bd7/0x3170
       do_user_addr_fault+0xa73/0x1340
       exc_page_fault+0x6a/0xc0
       asm_exc_page_fault+0x26/0x30

other info that might help us debug this:

Chain exists of:
  fs_reclaim --> vm_lock --> mapping.invalidate_lock#2

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(mapping.invalidate_lock#2);
                               lock(vm_lock);
                               lock(mapping.invalidate_lock#2);
  lock(fs_reclaim);

 *** DEADLOCK ***

1 lock held by syz.2.4585/16362:
 #0: ffff8881b89daa90 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_fault+0x95e/0x1300

stack backtrace:
CPU: 1 UID: 0 PID: 16362 Comm: syz.2.4585 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_circular_bug+0x2e1/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x15a5/0x2cf0
 lock_acquire+0x106/0x350
 fs_reclaim_acquire+0x71/0x100
 prepare_alloc_pages+0x152/0x650
 __alloc_frozen_pages_noprof+0x12f/0x380
 alloc_pages_mpol+0x235/0x490
 alloc_pages_noprof+0xac/0x2a0
 folio_alloc_noprof+0x1e/0x30
 filemap_alloc_folio_noprof+0x111/0x470
 __filemap_get_folio_mpol+0x3fc/0xb00
 filemap_fault+0x98e/0x1300
 __do_fault+0x138/0x2a0
 do_pte_missing+0x601/0x33f0
 handle_mm_fault+0x1bd7/0x3170
 do_user_addr_fault+0xa73/0x1340
 exc_page_fault+0x6a/0xc0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f3d71871626
Code: 89 4c 24 18 48 89 74 24 10 e8 c6 92 fe ff 49 8b 47 40 48 8b 74 24 10 48 8b 4c 24 18 41 01 77 30 48 29 f0 83 e1 06 49 89 47 40 <c6> 00 00 b8 01 00 00 00 0f 84 ab fe ff ff 66 66 2e 0f 1f 84 00 00
RSP: 002b:00007ffd7b6022c0 EFLAGS: 00010202
RAX: 0000001b33d19c28 RBX: ffffffff81e98409 RCX: 0000000000000004
RDX: 0000001b33724220 RSI: 0000000000000004 RDI: 00007f3d72745720
RBP: 0000000000000000 R08: 00007f3d71c00000 R09: 00007f3d71c02000
R10: 0000000081e9840d R11: 0000000000000006 R12: 00007f3d71c16038
R13: 0000000000000043 R14: ffffffff81e98409 R15: 00007f3d72745720
 </TASK>
syz.2.4585 invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=1000
CPU: 1 UID: 0 PID: 16362 Comm: syz.2.4585 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 dump_header+0xd3/0x4c0
 oom_kill_process+0x3ab/0x970
 out_of_memory+0x106c/0x1410
 try_charge_memcg+0xc77/0x1570
 charge_memcg+0x1a2/0x2b0
 __mem_cgroup_charge+0x25/0x80
 filemap_add_folio+0x152/0x530
 __filemap_get_folio_mpol+0x500/0xb00
 filemap_fault+0x98e/0x1300
 __do_fault+0x138/0x2a0
 do_pte_missing+0x601/0x33f0
 handle_mm_fault+0x1bd7/0x3170
 do_user_addr_fault+0xa73/0x1340
 exc_page_fault+0x6a/0xc0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f3d71871626
Code: 89 4c 24 18 48 89 74 24 10 e8 c6 92 fe ff 49 8b 47 40 48 8b 74 24 10 48 8b 4c 24 18 41 01 77 30 48 29 f0 83 e1 06 49 89 47 40 <c6> 00 00 b8 01 00 00 00 0f 84 ab fe ff ff 66 66 2e 0f 1f 84 00 00
RSP: 002b:00007ffd7b6022c0 EFLAGS: 00010202
RAX: 0000001b33d19c28 RBX: ffffffff81e98409 RCX: 0000000000000004
RDX: 0000001b33724220 RSI: 0000000000000004 RDI: 00007f3d72745720
RBP: 0000000000000000 R08: 00007f3d71c00000 R09: 00007f3d71c02000
R10: 0000000081e9840d R11: 0000000000000006 R12: 00007f3d71c16038
R13: 0000000000000043 R14: ffffffff81e98409 R15: 00007f3d72745720
 </TASK>
memory: usage 307200kB, limit 307200kB, failcnt 2293
memory+swap: usage 307360kB, limit 9007199254740988kB, failcnt 0
kmem: usage 297208kB, limit 9007199254740988kB, failcnt 0
Memory cgroup stats for /syz2:
cache 0
rss 0
rss_huge 0
shmem 0
mapped_file 0
dirty 0
writeback 0
workingset_refault_anon 31
workingset_refault_file 17
swap 163840
swapcached 348160
pgpgin 118271
pgpgout 115773
pgfault 268526
pgmajfault 27
inactive_anon 7061504
active_anon 2908160
inactive_file 0
active_file 0
unevictable 0
hierarchical_memory_limit 314572800
hierarchical_memsw_limit 9223372036854771712
total_cache 0
total_rss 0
total_rss_huge 0
total_shmem 0
total_mapped_file 0
total_dirty 0
total_writeback 0
total_workingset_refault_anon 31
total_workingset_refault_file 17
total_swap 163840
total_swapcached 348160
total_pgpgin 118271
total_pgpgout 115773
total_pgfault 268526
total_pgmajfault 27
total_inactive_anon 7061504
total_active_anon 2908160
total_inactive_file 0
total_active_file 0
total_unevictable 0
anon_cost 0
file_cost 0
oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0-1,oom_memcg=/syz2,task_memcg=/syz2,task=syz.2.4585,pid=16362,uid=0
Memory cgroup out of memory: Killed process 16362 (syz.2.4585) total-vm:104340kB, anon-rss:1244kB, file-rss:22732kB, shmem-rss:0kB, UID:0 pgtables:132kB oom_score_adj:1000
syz.2.4585 (16362) used greatest stack depth: 19680 bytes left
