REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage. ====================================================== WARNING: possible circular locking dependency detected 6.4.0-rc2-next-20230515-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor273/5072 is trying to acquire lock: ffff88807b098090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27 but task is already holding lock: ffff88807d9a2558 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x1a1/0x690 mm/memory.c:2934 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:1494 [inline] sb_start_pagefault include/linux/fs.h:1598 [inline] filemap_page_mkwrite+0x174/0x790 mm/filemap.c:3539 do_page_mkwrite+0x1a1/0x690 mm/memory.c:2934 wp_page_shared mm/memory.c:3283 [inline] do_wp_page+0x356/0x34e0 mm/memory.c:3365 handle_pte_fault mm/memory.c:4967 [inline] __handle_mm_fault+0x1635/0x4170 mm/memory.c:5092 handle_mm_fault+0x2af/0x9f0 mm/memory.c:5246 do_user_addr_fault+0x51a/0x1210 arch/x86/mm/fault.c:1440 handle_page_fault arch/x86/mm/fault.c:1534 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 -> #1 (&mm->mmap_lock){++++}-{3:3}: __might_fault mm/memory.c:5735 [inline] __might_fault+0x115/0x190 mm/memory.c:5728 reiserfs_ioctl+0x1d2/0x330 fs/reiserfs/ioctl.c:96 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 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:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088 lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5705 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 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+0x1e0/0xd60 fs/fs-writeback.c:2430 generic_update_time+0x21b/0x2b0 fs/inode.c:1859 inode_update_time fs/inode.c:1872 [inline] __file_update_time fs/inode.c:2057 [inline] file_update_time+0x224/0x270 fs/inode.c:2088 filemap_page_mkwrite+0x28c/0x790 mm/filemap.c:3540 do_page_mkwrite+0x1a1/0x690 mm/memory.c:2934 wp_page_shared mm/memory.c:3283 [inline] do_wp_page+0x356/0x34e0 mm/memory.c:3365 handle_pte_fault mm/memory.c:4967 [inline] __handle_mm_fault+0x1635/0x4170 mm/memory.c:5092 handle_mm_fault+0x2af/0x9f0 mm/memory.c:5246 do_user_addr_fault+0x51a/0x1210 arch/x86/mm/fault.c:1440 handle_page_fault arch/x86/mm/fault.c:1534 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 other info that might help us debug this: Chain exists of: &sbi->lock --> &mm->mmap_lock --> sb_pagefaults Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_pagefaults); lock(&mm->mmap_lock); lock(sb_pagefaults); lock(&sbi->lock); *** DEADLOCK *** 2 locks held by syz-executor273/5072: #0: ffff888015f36d68 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:161 [inline] #0: ffff888015f36d68 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x448/0x1210 arch/x86/mm/fault.c:1381 #1: ffff88807d9a2558 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x1a1/0x690 mm/memory.c:2934 stack backtrace: CPU: 0 PID: 5072 Comm: syz-executor273 Not tainted 6.4.0-rc2-next-20230515-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2188 check_prev_add kernel/locking/lockdep.c:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088 lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5705 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 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+0x1e0/0xd60 fs/fs-writeback.c:2430 generic_update_time+0x21b/0x2b0 fs/inode.c:1859 inode_update_time fs/inode.c:1872 [inline] __file_update_time fs/inode.c:2057 [inline] file_update_time+0x224/0x270 fs/inode.c:2088 filemap_page_mkwrite+0x28c/0x790 mm/filemap.c:3540 do_page_mkwrite+0x1a1/0x690 mm/memory.c:2934 wp_page_shared mm/memory.c:3283 [inline] do_wp_page+0x356/0x34e0 mm/memory.c:3365 handle_pte_fault mm/memory.c:4967 [inline] __handle_mm_fault+0x1635/0x4170 mm/memory.c:5092 handle_mm_fault+0x2af/0x9f0 mm/memory.c:5246 do_user_addr_fault+0x51a/0x1210 arch/x86/mm/fault.c:1440 handle_page_fault arch/x86/mm/fault.c:1534 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7f11885e8532 Code: ba 00 00 60 00 be 00 00 00 20 bf 09 00 00 00 6a 00 31 c0 e8 d0 24 04 00 bf 01 01 00 00 45 31 c0 48 b8 2f 64 65 76 2f 63 75 73 <48> 89 04 25 40 02 00 20 b9 02 00 00 00 ba 40 02 00 20 31 c0 66 c7 RSP: 002b:00007ffeb8166430 EFLAGS: 00010246 RAX: 7375632f7665642f RBX: 0000000000010c85 RCX: 00007f118862aa09 RDX: 00000000027fffff RSI: 0000000000600000 RDI: 0000000000000101 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000004002011 R11: 0000000000000246 R12: 00007ffeb816645c R13: 00007ffeb8166490 R14: 00007ffeb8166470 R15: 000000000000001f