syzbot

REISERFS (device loop5): Using r5 hash to sort names
REISERFS (device loop5): Created .reiserfs_priv - reserved for xattr storage.
======================================================
WARNING: possible circular locking dependency detected
6.2.0-rc1-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.5/30149 is trying to acquire lock:
ffff888022d38090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x77/0xd0 fs/reiserfs/lock.c:27

but task is already holding lock:
ffff88804fae91c0 (mapping.invalidate_lock#18){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:811 [inline]
ffff88804fae91c0 (mapping.invalidate_lock#18){.+.+}-{3:3}, at: page_cache_ra_unbounded+0xe9/0x820 mm/readahead.c:226

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (mapping.invalidate_lock#18){.+.+}-{3:3}:
       lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668
       down_read+0x39/0x50 kernel/locking/rwsem.c:1509
       filemap_invalidate_lock_shared include/linux/fs.h:811 [inline]
       filemap_fault+0x2fb/0x1060 mm/filemap.c:3146
       __do_fault+0x136/0x4f0 mm/memory.c:4163
       do_shared_fault mm/memory.c:4569 [inline]
       do_fault mm/memory.c:4647 [inline]
       handle_pte_fault mm/memory.c:4931 [inline]
       __handle_mm_fault mm/memory.c:5073 [inline]
       handle_mm_fault+0x18bc/0x26b0 mm/memory.c:5219
       do_user_addr_fault+0x69b/0xcb0 arch/x86/mm/fault.c:1428
       handle_page_fault arch/x86/mm/fault.c:1519 [inline]
       exc_page_fault+0x7a/0x110 arch/x86/mm/fault.c:1575
       asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570

-> #1 (&mm->mmap_lock){++++}-{3:3}:
       lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668
       __might_fault+0xb2/0x110 mm/memory.c:5647
       reiserfs_ioctl+0x11c/0x340 fs/reiserfs/ioctl.c:96
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:870 [inline]
       __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&sbi->lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3097 [inline]
       check_prevs_add kernel/locking/lockdep.c:3216 [inline]
       validate_chain+0x1898/0x6ae0 kernel/locking/lockdep.c:3831
       __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055
       lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668
       __mutex_lock_common+0x1bd/0x26e0 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799
       reiserfs_write_lock+0x77/0xd0 fs/reiserfs/lock.c:27
       reiserfs_get_block+0x24e/0x5180 fs/reiserfs/inode.c:680
       do_mpage_readpage+0x970/0x1c50 fs/mpage.c:208
       mpage_readahead+0x210/0x380 fs/mpage.c:361
       read_pages+0x169/0x9c0 mm/readahead.c:161
       page_cache_ra_unbounded+0x703/0x820 mm/readahead.c:270
       page_cache_sync_readahead include/linux/pagemap.h:1210 [inline]
       filemap_get_pages+0x465/0x10d0 mm/filemap.c:2600
       filemap_read+0x3cf/0xea0 mm/filemap.c:2694
       call_read_iter include/linux/fs.h:2180 [inline]
       generic_file_splice_read+0x1ff/0x5d0 fs/splice.c:309
       do_splice_to fs/splice.c:793 [inline]
       splice_direct_to_actor+0x41b/0xc00 fs/splice.c:865
       do_splice_direct+0x279/0x3d0 fs/splice.c:974
       do_sendfile+0x5fb/0xf80 fs/read_write.c:1255
       __do_sys_sendfile64 fs/read_write.c:1323 [inline]
       __se_sys_sendfile64+0x14f/0x1b0 fs/read_write.c:1309
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3d/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->lock --> &mm->mmap_lock --> mapping.invalidate_lock#18

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(mapping.invalidate_lock#18);
                               lock(&mm->mmap_lock);
                               lock(mapping.invalidate_lock#18);
  lock(&sbi->lock);

 *** DEADLOCK ***

2 locks held by syz-executor.5/30149:
 #0: ffff88807cd16460 (sb_writers#15){.+.+}-{0:0}, at: do_sendfile+0x5d6/0xf80 fs/read_write.c:1254
 #1: ffff88804fae91c0 (mapping.invalidate_lock#18){.+.+}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:811 [inline]
 #1: ffff88804fae91c0 (mapping.invalidate_lock#18){.+.+}-{3:3}, at: page_cache_ra_unbounded+0xe9/0x820 mm/readahead.c:226

stack backtrace:
CPU: 0 PID: 30149 Comm: syz-executor.5 Not tainted 6.2.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106
 check_noncircular+0x2cc/0x390 kernel/locking/lockdep.c:2177
 check_prev_add kernel/locking/lockdep.c:3097 [inline]
 check_prevs_add kernel/locking/lockdep.c:3216 [inline]
 validate_chain+0x1898/0x6ae0 kernel/locking/lockdep.c:3831
 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055
 lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668
 __mutex_lock_common+0x1bd/0x26e0 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799
 reiserfs_write_lock+0x77/0xd0 fs/reiserfs/lock.c:27
 reiserfs_get_block+0x24e/0x5180 fs/reiserfs/inode.c:680
 do_mpage_readpage+0x970/0x1c50 fs/mpage.c:208
 mpage_readahead+0x210/0x380 fs/mpage.c:361
 read_pages+0x169/0x9c0 mm/readahead.c:161
 page_cache_ra_unbounded+0x703/0x820 mm/readahead.c:270
 page_cache_sync_readahead include/linux/pagemap.h:1210 [inline]
 filemap_get_pages+0x465/0x10d0 mm/filemap.c:2600
 filemap_read+0x3cf/0xea0 mm/filemap.c:2694
 call_read_iter include/linux/fs.h:2180 [inline]
 generic_file_splice_read+0x1ff/0x5d0 fs/splice.c:309
 do_splice_to fs/splice.c:793 [inline]
 splice_direct_to_actor+0x41b/0xc00 fs/splice.c:865
 do_splice_direct+0x279/0x3d0 fs/splice.c:974
 do_sendfile+0x5fb/0xf80 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64+0x14f/0x1b0 fs/read_write.c:1309
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc615a8c0a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc6145fe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fc615babf80 RCX: 00007fc615a8c0a9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007fc615ae7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0001000000201005 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd9257faaf R14: 00007fc6145fe300 R15: 0000000000022000
 </TASK>