REISERFS (device loop0): Using r5 hash to sort names REISERFS (device loop0): using 3.5.x disk format REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage. ====================================================== WARNING: possible circular locking dependency detected 6.6.0-syzkaller-16159-g3ca112b71f35 #0 Not tainted ------------------------------------------------------ syz-executor.0/5620 is trying to acquire lock: ffffc900050e60f0 (&journal->j_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:813 [inline] ffffc900050e60f0 (&journal->j_mutex){+.+.}-{3:3}, at: lock_journal fs/reiserfs/journal.c:533 [inline] ffffc900050e60f0 (&journal->j_mutex){+.+.}-{3:3}, at: do_journal_begin_r+0x352/0x1020 fs/reiserfs/journal.c:3047 but task is already holding lock: ffff88807c324510 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x197/0x470 mm/memory.c:2943 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_pagefaults){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1635 [inline] sb_start_pagefault include/linux/fs.h:1739 [inline] filemap_page_mkwrite+0x16f/0x640 mm/filemap.c:3577 do_page_mkwrite+0x197/0x470 mm/memory.c:2943 do_shared_fault mm/memory.c:4704 [inline] do_fault mm/memory.c:4766 [inline] do_pte_missing mm/memory.c:3730 [inline] handle_pte_fault mm/memory.c:5038 [inline] __handle_mm_fault mm/memory.c:5179 [inline] handle_mm_fault+0x22d4/0x6650 mm/memory.c:5344 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x2ac/0x860 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 __put_user_4+0x11/0x20 arch/x86/lib/putuser.S:86 reiserfs_ioctl+0x155/0x2f0 fs/reiserfs/ioctl.c:96 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b -> #1 (&sbi->lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x136/0xd60 kernel/locking/mutex.c:747 reiserfs_write_lock_nested+0x5f/0xd0 fs/reiserfs/lock.c:78 reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline] lock_journal fs/reiserfs/journal.c:533 [inline] do_journal_begin_r+0x35d/0x1020 fs/reiserfs/journal.c:3047 journal_begin+0x14c/0x360 fs/reiserfs/journal.c:3254 reiserfs_fill_super+0x1853/0x2620 fs/reiserfs/super.c:2104 mount_bdev+0x237/0x300 fs/super.c:1650 legacy_get_tree+0xef/0x190 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1771 do_new_mount+0x28f/0xae0 fs/namespace.c:3337 do_mount fs/namespace.c:3677 [inline] __do_sys_mount fs/namespace.c:3886 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3863 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b -> #0 (&journal->j_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x39ff/0x7f70 kernel/locking/lockdep.c:5136 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5753 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x136/0xd60 kernel/locking/mutex.c:747 reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:813 [inline] lock_journal fs/reiserfs/journal.c:533 [inline] do_journal_begin_r+0x352/0x1020 fs/reiserfs/journal.c:3047 journal_begin+0x14c/0x360 fs/reiserfs/journal.c:3254 reiserfs_dirty_inode+0x120/0x240 fs/reiserfs/super.c:710 __mark_inode_dirty+0x305/0xd90 fs/fs-writeback.c:2452 generic_update_time fs/inode.c:1941 [inline] inode_update_time fs/inode.c:1954 [inline] __file_update_time fs/inode.c:2142 [inline] file_update_time+0x191/0x1b0 fs/inode.c:2172 filemap_page_mkwrite+0x27b/0x640 mm/filemap.c:3578 do_page_mkwrite+0x197/0x470 mm/memory.c:2943 do_shared_fault mm/memory.c:4704 [inline] do_fault mm/memory.c:4766 [inline] do_pte_missing mm/memory.c:3730 [inline] handle_pte_fault mm/memory.c:5038 [inline] __handle_mm_fault mm/memory.c:5179 [inline] handle_mm_fault+0x22d4/0x6650 mm/memory.c:5344 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x2ac/0x860 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 __put_user_4+0x11/0x20 arch/x86/lib/putuser.S:86 reiserfs_ioctl+0x155/0x2f0 fs/reiserfs/ioctl.c:96 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b other info that might help us debug this: Chain exists of: &journal->j_mutex --> &sbi->lock --> sb_pagefaults Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_pagefaults); lock(&sbi->lock); lock(sb_pagefaults); lock(&journal->j_mutex); *** DEADLOCK *** 2 locks held by syz-executor.0/5620: #0: ffff8880612e81a0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline] #0: ffff8880612e81a0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5371 [inline] #0: ffff8880612e81a0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2d0 mm/memory.c:5431 #1: ffff88807c324510 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x197/0x470 mm/memory.c:2943 stack backtrace: CPU: 0 PID: 5620 Comm: syz-executor.0 Not tainted 6.6.0-syzkaller-16159-g3ca112b71f35 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 check_noncircular+0x375/0x4a0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x39ff/0x7f70 kernel/locking/lockdep.c:5136 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5753 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x136/0xd60 kernel/locking/mutex.c:747 reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:813 [inline] lock_journal fs/reiserfs/journal.c:533 [inline] do_journal_begin_r+0x352/0x1020 fs/reiserfs/journal.c:3047 journal_begin+0x14c/0x360 fs/reiserfs/journal.c:3254 reiserfs_dirty_inode+0x120/0x240 fs/reiserfs/super.c:710 __mark_inode_dirty+0x305/0xd90 fs/fs-writeback.c:2452 generic_update_time fs/inode.c:1941 [inline] inode_update_time fs/inode.c:1954 [inline] __file_update_time fs/inode.c:2142 [inline] file_update_time+0x191/0x1b0 fs/inode.c:2172 filemap_page_mkwrite+0x27b/0x640 mm/filemap.c:3578 do_page_mkwrite+0x197/0x470 mm/memory.c:2943 do_shared_fault mm/memory.c:4704 [inline] do_fault mm/memory.c:4766 [inline] do_pte_missing mm/memory.c:3730 [inline] handle_pte_fault mm/memory.c:5038 [inline] __handle_mm_fault mm/memory.c:5179 [inline] handle_mm_fault+0x22d4/0x6650 mm/memory.c:5344 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x2ac/0x860 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:__put_user_4+0x11/0x20 arch/x86/lib/putuser.S:88 Code: 01 ca c3 66 0f 1f 44 00 00 f3 0f 1e fa 0f 01 cb 66 89 01 31 c9 0f 01 ca c3 f3 0f 1e fa 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca c3 0f 1f 80 00 00 00 00 f3 0f 1e fa 0f 01 cb RSP: 0018:ffffc90004eb7eb0 EFLAGS: 00050206 RAX: 0000000000000002 RBX: 0000000000000000 RCX: 0000000020000000 RDX: 0000000000000001 RSI: ffffffff8b6ac0c0 RDI: ffffffff8bbdeec0 RBP: 1ffff1100eebff1f R08: ffffffff8f00c6af R09: 1ffffffff1e018d5 R10: dffffc0000000000 R11: fffffbfff1e018d6 R12: ffff88806d2e0f00 R13: ffff8880775ffd38 R14: ffff8880775ff8f8 R15: 0000000020000000 reiserfs_ioctl+0x155/0x2f0 fs/reiserfs/ioctl.c:96 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f3afa27cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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:00007f3afb07e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f3afa39bf80 RCX: 00007f3afa27cae9 RDX: 0000000020000000 RSI: 0000000080087601 RDI: 0000000000000005 RBP: 00007f3afa2c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f3afa39bf80 R15: 00007ffe41658c68 ---------------- Code disassembly (best guess): 0: 01 ca add %ecx,%edx 2: c3 ret 3: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) 9: f3 0f 1e fa endbr64 d: 0f 01 cb stac 10: 66 89 01 mov %ax,(%rcx) 13: 31 c9 xor %ecx,%ecx 15: 0f 01 ca clac 18: c3 ret 19: f3 0f 1e fa endbr64 1d: 48 89 cb mov %rcx,%rbx 20: 48 c1 fb 3f sar $0x3f,%rbx 24: 48 09 d9 or %rbx,%rcx 27: 0f 01 cb stac * 2a: 89 01 mov %eax,(%rcx) <-- trapping instruction 2c: 31 c9 xor %ecx,%ecx 2e: 0f 01 ca clac 31: c3 ret 32: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 39: f3 0f 1e fa endbr64 3d: 0f 01 cb stac