syzbot

======================================================
WARNING: possible circular locking dependency detected
6.5.0-rc4-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor381/32714 is trying to acquire lock:
ffff88802e41e0e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_get_block+0x187/0x17b0 fs/exfat/inode.c:280

but task is already holding lock:
ffff88806ea40d50 (mapping.invalidate_lock#3){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:826 [inline]
ffff88806ea40d50 (mapping.invalidate_lock#3){.+.+}-{3:3}, at: page_cache_ra_unbounded+0x13a/0x5e0 mm/readahead.c:225

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (mapping.invalidate_lock#3){.+.+}-{3:3}:
       down_read+0x9c/0x470 kernel/locking/rwsem.c:1520
       filemap_invalidate_lock_shared include/linux/fs.h:826 [inline]
       filemap_fault+0x276/0x2680 mm/filemap.c:3289
       __do_fault+0x107/0x5f0 mm/memory.c:4198
       do_read_fault mm/memory.c:4547 [inline]
       do_fault mm/memory.c:4670 [inline]
       do_pte_missing mm/memory.c:3664 [inline]
       handle_pte_fault mm/memory.c:4939 [inline]
       __handle_mm_fault+0x27e0/0x3b80 mm/memory.c:5079
       handle_mm_fault+0x2ab/0x9d0 mm/memory.c:5233
       do_user_addr_fault+0x446/0xfc0 arch/x86/mm/fault.c:1392
       handle_page_fault arch/x86/mm/fault.c:1486 [inline]
       exc_page_fault+0x5c/0xd0 arch/x86/mm/fault.c:1542
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
       do_strncpy_from_user lib/strncpy_from_user.c:41 [inline]
       strncpy_from_user+0x165/0x300 lib/strncpy_from_user.c:139
       getname_flags.part.0+0x93/0x4d0 fs/namei.c:151
       getname_flags include/linux/audit.h:319 [inline]
       getname+0x90/0xe0 fs/namei.c:219
       do_sys_openat2+0x100/0x1e0 fs/open.c:1401
       do_sys_open fs/open.c:1422 [inline]
       __do_sys_open fs/open.c:1430 [inline]
       __se_sys_open fs/open.c:1426 [inline]
       __x64_sys_open+0x154/0x1e0 fs/open.c:1426
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #1 (&mm->mmap_lock){++++}-{3:3}:
       down_read_killable+0x9f/0x4b0 kernel/locking/rwsem.c:1543
       mmap_read_lock_killable include/linux/mmap_lock.h:157 [inline]
       get_mmap_lock_carefully mm/memory.c:5272 [inline]
       lock_mm_and_find_vma+0x3fb/0x780 mm/memory.c:5323
       do_user_addr_fault+0x3fd/0xfc0 arch/x86/mm/fault.c:1364
       handle_page_fault arch/x86/mm/fault.c:1486 [inline]
       exc_page_fault+0x5c/0xd0 arch/x86/mm/fault.c:1542
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
       filldir64+0x289/0x5d0 fs/readdir.c:335
       dir_emit_dot include/linux/fs.h:3180 [inline]
       dir_emit_dots include/linux/fs.h:3191 [inline]
       exfat_iterate+0x577/0xb40 fs/exfat/dir.c:235
       iterate_dir+0x201/0x740 fs/readdir.c:67
       __do_sys_getdents64 fs/readdir.c:369 [inline]
       __se_sys_getdents64 fs/readdir.c:354 [inline]
       __x64_sys_getdents64+0x14f/0x2e0 fs/readdir.c:354
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&sbi->s_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3142 [inline]
       check_prevs_add kernel/locking/lockdep.c:3261 [inline]
       validate_chain kernel/locking/lockdep.c:3876 [inline]
       __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5144
       lock_acquire kernel/locking/lockdep.c:5761 [inline]
       lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x181/0x1340 kernel/locking/mutex.c:747
       exfat_get_block+0x187/0x17b0 fs/exfat/inode.c:280
       do_mpage_readpage+0x6f8/0x1ab0 fs/mpage.c:234
       mpage_readahead+0x344/0x580 fs/mpage.c:382
       read_pages+0x1d1/0xda0 mm/readahead.c:160
       page_cache_ra_unbounded+0x457/0x5e0 mm/readahead.c:269
       do_page_cache_ra mm/readahead.c:299 [inline]
       page_cache_ra_order+0x72b/0xa80 mm/readahead.c:559
       ondemand_readahead+0x540/0x1150 mm/readahead.c:681
       page_cache_sync_ra+0x174/0x1d0 mm/readahead.c:708
       page_cache_sync_readahead include/linux/pagemap.h:1213 [inline]
       filemap_get_pages+0xc05/0x1820 mm/filemap.c:2563
       filemap_read+0x373/0xd00 mm/filemap.c:2658
       generic_file_read_iter+0x346/0x450 mm/filemap.c:2837
       __kernel_read+0x301/0x8a0 fs/read_write.c:428
       integrity_kernel_read+0x7f/0xb0 security/integrity/iint.c:195
       ima_calc_file_hash_tfm+0x2c5/0x3d0 security/integrity/ima/ima_crypto.c:485
       ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
       ima_calc_file_hash+0x1c6/0x4a0 security/integrity/ima/ima_crypto.c:573
       ima_collect_measurement+0x5e2/0x6f0 security/integrity/ima/ima_api.c:289
       process_measurement+0xc87/0x1cc0 security/integrity/ima/ima_main.c:345
       ima_file_check+0xc2/0x110 security/integrity/ima/ima_main.c:543
       do_open fs/namei.c:3638 [inline]
       path_openat+0x17a1/0x29c0 fs/namei.c:3793
       do_filp_open+0x1de/0x430 fs/namei.c:3820
       do_sys_openat2+0x176/0x1e0 fs/open.c:1407
       do_sys_open fs/open.c:1422 [inline]
       __do_sys_open fs/open.c:1430 [inline]
       __se_sys_open fs/open.c:1426 [inline]
       __x64_sys_open+0x154/0x1e0 fs/open.c:1426
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

other info that might help us debug this:

Chain exists of:
  &sbi->s_lock --> &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);
  lock(&sbi->s_lock);

 *** DEADLOCK ***

2 locks held by syz-executor381/32714:
 #0: ffff8880225d82c0 (&iint->mutex){+.+.}-{3:3}, at: process_measurement+0x893/0x1cc0 security/integrity/ima/ima_main.c:266
 #1: ffff88806ea40d50 (mapping.invalidate_lock#3){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:826 [inline]
 #1: ffff88806ea40d50 (mapping.invalidate_lock#3){.+.+}-{3:3}, at: page_cache_ra_unbounded+0x13a/0x5e0 mm/readahead.c:225

stack backtrace:
CPU: 0 PID: 32714 Comm: syz-executor381 Not tainted 6.5.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 check_noncircular+0x311/0x3f0 kernel/locking/lockdep.c:2195
 check_prev_add kernel/locking/lockdep.c:3142 [inline]
 check_prevs_add kernel/locking/lockdep.c:3261 [inline]
 validate_chain kernel/locking/lockdep.c:3876 [inline]
 __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5144
 lock_acquire kernel/locking/lockdep.c:5761 [inline]
 lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
 __mutex_lock_common kernel/locking/mutex.c:603 [inline]
 __mutex_lock+0x181/0x1340 kernel/locking/mutex.c:747
 exfat_get_block+0x187/0x17b0 fs/exfat/inode.c:280
 do_mpage_readpage+0x6f8/0x1ab0 fs/mpage.c:234
 mpage_readahead+0x344/0x580 fs/mpage.c:382
 read_pages+0x1d1/0xda0 mm/readahead.c:160
 page_cache_ra_unbounded+0x457/0x5e0 mm/readahead.c:269
 do_page_cache_ra mm/readahead.c:299 [inline]
 page_cache_ra_order+0x72b/0xa80 mm/readahead.c:559
 ondemand_readahead+0x540/0x1150 mm/readahead.c:681
 page_cache_sync_ra+0x174/0x1d0 mm/readahead.c:708
 page_cache_sync_readahead include/linux/pagemap.h:1213 [inline]
 filemap_get_pages+0xc05/0x1820 mm/filemap.c:2563
 filemap_read+0x373/0xd00 mm/filemap.c:2658
 generic_file_read_iter+0x346/0x450 mm/filemap.c:2837
 __kernel_read+0x301/0x8a0 fs/read_write.c:428
 integrity_kernel_read+0x7f/0xb0 security/integrity/iint.c:195
 ima_calc_file_hash_tfm+0x2c5/0x3d0 security/integrity/ima/ima_crypto.c:485
 ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
 ima_calc_file_hash+0x1c6/0x4a0 security/integrity/ima/ima_crypto.c:573
 ima_collect_measurement+0x5e2/0x6f0 security/integrity/ima/ima_api.c:289
 process_measurement+0xc87/0x1cc0 security/integrity/ima/ima_main.c:345
 ima_file_check+0xc2/0x110 security/integrity/ima/ima_main.c:543
 do_open fs/namei.c:3638 [inline]
 path_openat+0x17a1/0x29c0 fs/namei.c:3793
 do_filp_open+0x1de/0x430 fs/namei.c:3820
 do_sys_openat2+0x176/0x1e0 fs/open.c:1407
 do_sys_open fs/open.c:1422 [inline]
 __do_sys_open fs/open.c:1430 [inline]
 __se_sys_open fs/open.c:1426 [inline]
 __x64_sys_open+0x154/0x1e0 fs/open.c:1426
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f443763e3a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 1d 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f442f1f0168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f44376c06f8 RCX: 00007f443763e3a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007f44376c06f0 R08: 00007f442f1f06c0 R09: 0000000000000000
R10: 00007f442f1f06c0 R11: 0000000000000246 R12: 00007f44376c06fc
R13: 000000000000006e R14: 00007ffdd62df630 R15: 00007ffdd62df718
 </TASK>
syz-executor381 (32714) used greatest stack depth: 21208 bytes left