======================================================
WARNING: possible circular locking dependency detected
6.2.0-rc3-next-20230109 #1 Not tainted
------------------------------------------------------
syz-executor.0/10359 is trying to acquire lock:
ffff88800f80d918 (&mm->mmap_lock){++++}-{3:3}, at: internal_get_user_pages_fast+0x1329/0x2d60

but task is already holding lock:
ffff88801bee17e0 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: ext4_file_write_iter+0x37d/0x1930

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&sb->s_type->i_mutex_key#6){++++}-{3:3}:
       down_read+0x9c/0x450
       ext4_bmap+0x52/0x470
       bmap+0xb0/0x130
       jbd2_journal_bmap+0xac/0x190
       jbd2_journal_flush+0x857/0xc10
       __ext4_ioctl+0x9db/0x43d0
       __x64_sys_ioctl+0x19e/0x210
       do_syscall_64+0x3f/0x90
       entry_SYSCALL_64_after_hwframe+0x72/0xdc

-> #2 (&journal->j_checkpoint_mutex){+.+.}-{3:3}:
       mutex_lock_io_nested+0x14c/0x1330
       __jbd2_log_wait_for_space+0x238/0x460
       add_transaction_credits+0xa42/0xb80
       start_this_handle+0x3ac/0x14c0
       jbd2__journal_start+0x394/0x6b0
       __ext4_journal_start_sb+0x4c2/0x6f0
       ext4_dirty_inode+0xa5/0x130
       __mark_inode_dirty+0x1aa/0xee0
       generic_update_time+0x21b/0x2b0
       file_update_time+0x22f/0x280
       ext4_page_mkwrite+0x2ee/0x1ab0
       do_page_mkwrite+0x1a0/0x640
       __handle_mm_fault+0x12ac/0x3640
       handle_mm_fault+0x1b8/0x860
       do_user_addr_fault+0x53a/0x1300
       exc_page_fault+0x9c/0x1a0
       asm_exc_page_fault+0x26/0x30

-> #1 (sb_pagefaults){.+.+}-{0:0}:
       ext4_page_mkwrite+0x1fc/0x1ab0
       do_page_mkwrite+0x1a0/0x640
       __handle_mm_fault+0x12ac/0x3640
       handle_mm_fault+0x1b8/0x860
       do_user_addr_fault+0x53a/0x1300
       exc_page_fault+0x9c/0x1a0
       asm_exc_page_fault+0x26/0x30

-> #0 (&mm->mmap_lock){++++}-{3:3}:
       __lock_acquire+0x2999/0x5e00
       lock_acquire.part.0+0x11e/0x340
       internal_get_user_pages_fast+0x138a/0x2d60
       get_user_pages_fast+0x6a/0xa0
       __iov_iter_get_pages_alloc+0x39f/0x2310
       iov_iter_get_pages+0xb0/0x110
       bio_iov_iter_get_pages+0x2a1/0x1070
       iomap_dio_bio_iter+0xa8b/0x14a0
       __iomap_dio_rw+0xe10/0x1bf0
       iomap_dio_rw+0x40/0xa0
       ext4_file_write_iter+0xb5d/0x1930
       vfs_write+0x9c7/0xdd0
       ksys_write+0x12b/0x260
       do_syscall_64+0x3f/0x90
       entry_SYSCALL_64_after_hwframe+0x72/0xdc

other info that might help us debug this:

Chain exists of:
  &mm->mmap_lock --> &journal->j_checkpoint_mutex --> &sb->s_type->i_mutex_key#6

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&sb->s_type->i_mutex_key#6);
                               lock(&journal->j_checkpoint_mutex);
                               lock(&sb->s_type->i_mutex_key#6);
  lock(&mm->mmap_lock);

 *** DEADLOCK ***

3 locks held by syz-executor.0/10359:
 #0: ffff88800e3a1768 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xeb/0x110
 #1: ffff888008eb2438 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x12b/0x260
 #2: ffff88801bee17e0 (&sb->s_type->i_mutex_key#6){++++}-{3:3}, at: ext4_file_write_iter+0x37d/0x1930

stack backtrace:
CPU: 0 PID: 10359 Comm: syz-executor.0 Not tainted 6.2.0-rc3-next-20230109 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x8f/0xb7
 check_noncircular+0x263/0x2e0
 __lock_acquire+0x2999/0x5e00
 lock_acquire.part.0+0x11e/0x340
 internal_get_user_pages_fast+0x138a/0x2d60
 get_user_pages_fast+0x6a/0xa0
 __iov_iter_get_pages_alloc+0x39f/0x2310
 iov_iter_get_pages+0xb0/0x110
 bio_iov_iter_get_pages+0x2a1/0x1070
 iomap_dio_bio_iter+0xa8b/0x14a0
 __iomap_dio_rw+0xe10/0x1bf0
 iomap_dio_rw+0x40/0xa0
 ext4_file_write_iter+0xb5d/0x1930
 vfs_write+0x9c7/0xdd0
 ksys_write+0x12b/0x260
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f234d5c6b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f234ab3c188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f234d6d9f60 RCX: 00007f234d5c6b19
RDX: 0000000000140000 RSI: 0000000020000200 RDI: 0000000000000003
RBP: 00007f234d620f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe50981bdf R14: 00007f234ab3c300 R15: 0000000000022000
 </TASK>
audit: type=1400 audit(1673263387.016:33): avc:  denied  { tracepoint } for  pid=10391 comm="syz-executor.2" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1
blktrace: Concurrent blktraces are not allowed on sg0