Hello, syzbot found the following issue on: HEAD commit: a4412fdd49dc error-injection: Add prompt for function erro.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1418c55b880000 kernel config: https://syzkaller.appspot.com/x/.config?x=4aa2a38f1d88bd1c dashboard link: https://syzkaller.appspot.com/bug?extid=9b9bbfea68487857fb9c compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9b9bbfea68487857fb9c@xxxxxxxxxxxxxxxxxxxxxxxxx ====================================================== WARNING: possible circular locking dependency detected 6.1.0-rc7-syzkaller-00123-ga4412fdd49dc #0 Not tainted ------------------------------------------------------ klogd/3144 is trying to acquire lock: ffff88801ef6d090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27 but task is already holding lock: ffffffff8c6c9a40 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4755 [inline] ffffffff8c6c9a40 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4780 [inline] ffffffff8c6c9a40 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x808/0x23d0 mm/page_alloc.c:5186 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire mm/page_alloc.c:4682 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:4696 might_alloc include/linux/sched/mm.h:271 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slab.c:3241 [inline] slab_alloc mm/slab.c:3265 [inline] __kmem_cache_alloc_lru mm/slab.c:3442 [inline] kmem_cache_alloc_lru+0x3e/0x7b0 mm/slab.c:3468 __d_alloc+0x32/0x980 fs/dcache.c:1769 d_alloc_anon fs/dcache.c:1868 [inline] d_make_root+0x49/0x110 fs/dcache.c:2069 reiserfs_fill_super+0x12eb/0x2e90 fs/reiserfs/super.c:2083 mount_bdev+0x351/0x410 fs/super.c:1401 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x2f0 fs/super.c:1531 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x132a/0x1e20 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 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 kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747 reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27 reiserfs_dirty_inode+0xd2/0x260 fs/reiserfs/super.c:704 __mark_inode_dirty+0x247/0x11e0 fs/fs-writeback.c:2408 mark_inode_dirty_sync include/linux/fs.h:2480 [inline] iput.part.0+0x57/0x880 fs/inode.c:1770 iput+0x5c/0x80 fs/inode.c:1763 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401 __dentry_kill+0x3c0/0x640 fs/dcache.c:607 shrink_dentry_list+0x240/0x800 fs/dcache.c:1201 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282 super_cache_scan+0x33a/0x590 fs/super.c:104 do_shrink_slab+0x464/0xce0 mm/vmscan.c:842 shrink_slab_memcg mm/vmscan.c:911 [inline] shrink_slab+0x388/0x660 mm/vmscan.c:990 shrink_node_memcgs mm/vmscan.c:6112 [inline] shrink_node+0x93d/0x1f30 mm/vmscan.c:6141 shrink_zones mm/vmscan.c:6379 [inline] do_try_to_free_pages+0x3b4/0x17a0 mm/vmscan.c:6441 try_to_free_pages+0x2e5/0x960 mm/vmscan.c:6676 __perform_reclaim mm/page_alloc.c:4758 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4780 [inline] __alloc_pages_slowpath.constprop.0+0x8b6/0x23d0 mm/page_alloc.c:5186 __alloc_pages+0x4aa/0x5b0 mm/page_alloc.c:5571 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 folio_alloc+0x20/0x70 mm/mempolicy.c:2295 filemap_alloc_folio+0x30a/0x3a0 mm/filemap.c:971 __filemap_get_folio+0x32c/0xd90 mm/filemap.c:1965 filemap_fault+0x15aa/0x2400 mm/filemap.c:3145 __do_fault+0x107/0x600 mm/memory.c:4203 do_read_fault mm/memory.c:4554 [inline] do_fault mm/memory.c:4683 [inline] handle_pte_fault mm/memory.c:4955 [inline] __handle_mm_fault+0x2184/0x3a40 mm/memory.c:5097 handle_mm_fault+0x1cc/0x780 mm/memory.c:5218 do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1428 handle_page_fault arch/x86/mm/fault.c:1519 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1575 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(&sbi->lock); lock(fs_reclaim); lock(&sbi->lock); *** DEADLOCK *** 4 locks held by klogd/3144: #0: ffff8880210a28a0 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] #0: ffff8880210a28a0 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0x1564/0x2400 mm/filemap.c:3142 #1: ffffffff8c6c9a40 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4755 [inline] #1: ffffffff8c6c9a40 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4780 [inline] #1: ffffffff8c6c9a40 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x808/0x23d0 mm/page_alloc.c:5186 #2: ffffffff8c688470 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab_memcg mm/vmscan.c:884 [inline] #2: ffffffff8c688470 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x2a0/0x660 mm/vmscan.c:990 #3: ffff88801c1200e0 (&type->s_umount_key#63){++++}-{3:3}, at: trylock_super fs/super.c:415 [inline] #3: ffff88801c1200e0 (&type->s_umount_key#63){++++}-{3:3}, at: super_cache_scan+0x70/0x590 fs/super.c:79 stack backtrace: CPU: 2 PID: 3144 Comm: klogd Not tainted 6.1.0-rc7-syzkaller-00123-ga4412fdd49dc #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 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 kernel/locking/lockdep.c:3831 [inline] __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747 reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27 reiserfs_dirty_inode+0xd2/0x260 fs/reiserfs/super.c:704 __mark_inode_dirty+0x247/0x11e0 fs/fs-writeback.c:2408 mark_inode_dirty_sync include/linux/fs.h:2480 [inline] iput.part.0+0x57/0x880 fs/inode.c:1770 iput+0x5c/0x80 fs/inode.c:1763 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401 __dentry_kill+0x3c0/0x640 fs/dcache.c:607 shrink_dentry_list+0x240/0x800 fs/dcache.c:1201 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282 super_cache_scan+0x33a/0x590 fs/super.c:104 do_shrink_slab+0x464/0xce0 mm/vmscan.c:842 shrink_slab_memcg mm/vmscan.c:911 [inline] shrink_slab+0x388/0x660 mm/vmscan.c:990 shrink_node_memcgs mm/vmscan.c:6112 [inline] shrink_node+0x93d/0x1f30 mm/vmscan.c:6141 shrink_zones mm/vmscan.c:6379 [inline] do_try_to_free_pages+0x3b4/0x17a0 mm/vmscan.c:6441 try_to_free_pages+0x2e5/0x960 mm/vmscan.c:6676 __perform_reclaim mm/page_alloc.c:4758 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:4780 [inline] __alloc_pages_slowpath.constprop.0+0x8b6/0x23d0 mm/page_alloc.c:5186 __alloc_pages+0x4aa/0x5b0 mm/page_alloc.c:5571 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 folio_alloc+0x20/0x70 mm/mempolicy.c:2295 filemap_alloc_folio+0x30a/0x3a0 mm/filemap.c:971 __filemap_get_folio+0x32c/0xd90 mm/filemap.c:1965 filemap_fault+0x15aa/0x2400 mm/filemap.c:3145 __do_fault+0x107/0x600 mm/memory.c:4203 do_read_fault mm/memory.c:4554 [inline] do_fault mm/memory.c:4683 [inline] handle_pte_fault mm/memory.c:4955 [inline] __handle_mm_fault+0x2184/0x3a40 mm/memory.c:5097 handle_mm_fault+0x1cc/0x780 mm/memory.c:5218 do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1428 handle_page_fault arch/x86/mm/fault.c:1519 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1575 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7fb9df1a0df1 Code: Unable to access opcode bytes at 0x7fb9df1a0dc7. RSP: 002b:00007ffd6af99d40 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000000 RCX: 0000000000000006 RDX: 00007fb9df2626c6 RSI: 00007fb9df26423e RDI: 00007fb9df2626c6 RBP: 0000559d3192c2e4 R08: 0000000000000001 R09: 00007ffd6af99e5f R10: 0000000000000000 R11: 0000559d3192c2e4 R12: 00000000ffffffff R13: 0000000000000000 R14: 00007fb9df26423e R15: 0000000000000000 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
