REISERFS (device loop0): Using r5 hash to sort names reiserfs: enabling write barrier flush mode REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage. ====================================================== WARNING: possible circular locking dependency detected 5.15.124-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor392/3498 is trying to acquire lock: ffff888147edf090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x76/0xd0 fs/reiserfs/lock.c:27 but task is already holding lock: ffff888078012558 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x1a9/0x440 mm/memory.c:2892 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_pagefaults){.+.+}-{0:0}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1742 [inline] sb_start_pagefault include/linux/fs.h:1841 [inline] filemap_page_mkwrite+0x11b/0x650 mm/filemap.c:3358 do_page_mkwrite+0x1a9/0x440 mm/memory.c:2892 do_shared_fault mm/memory.c:4298 [inline] do_fault mm/memory.c:4366 [inline] handle_pte_fault mm/memory.c:4621 [inline] __handle_mm_fault mm/memory.c:4756 [inline] handle_mm_fault+0x2803/0x5950 mm/memory.c:4854 do_user_addr_fault arch/x86/mm/fault.c:1397 [inline] handle_page_fault arch/x86/mm/fault.c:1485 [inline] exc_page_fault+0x271/0x740 arch/x86/mm/fault.c:1541 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568 copy_user_enhanced_fast_string+0xe/0x40 arch/x86/lib/copy_user_64.S:205 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] copyout lib/iov_iter.c:157 [inline] copy_page_to_iter_iovec lib/iov_iter.c:228 [inline] __copy_page_to_iter lib/iov_iter.c:861 [inline] copy_page_to_iter+0x49a/0x10d0 lib/iov_iter.c:889 filemap_read+0x20f6/0x2980 mm/filemap.c:2689 call_read_iter include/linux/fs.h:2097 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0xa9f/0xe10 fs/read_write.c:485 ksys_read+0x1a2/0x2c0 fs/read_write.c:623 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+0x61/0xcb -> #1 (&mm->mmap_lock#2){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __might_fault+0xb4/0x110 mm/memory.c:5324 reiserfs_ioctl+0x11d/0x340 fs/reiserfs/ioctl.c:96 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 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+0x61/0xcb -> #0 (&sbi->lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 reiserfs_write_lock+0x76/0xd0 fs/reiserfs/lock.c:27 reiserfs_dirty_inode+0xee/0x240 fs/reiserfs/super.c:704 __mark_inode_dirty+0x2fd/0xd60 fs/fs-writeback.c:2442 generic_update_time+0x1cb/0x1e0 fs/inode.c:1817 inode_update_time fs/inode.c:1830 [inline] file_update_time+0x3eb/0x460 fs/inode.c:2019 filemap_page_mkwrite+0x222/0x650 mm/filemap.c:3359 do_page_mkwrite+0x1a9/0x440 mm/memory.c:2892 do_shared_fault mm/memory.c:4298 [inline] do_fault mm/memory.c:4366 [inline] handle_pte_fault mm/memory.c:4621 [inline] __handle_mm_fault mm/memory.c:4756 [inline] handle_mm_fault+0x2803/0x5950 mm/memory.c:4854 do_user_addr_fault arch/x86/mm/fault.c:1397 [inline] handle_page_fault arch/x86/mm/fault.c:1485 [inline] exc_page_fault+0x271/0x740 arch/x86/mm/fault.c:1541 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568 copy_user_enhanced_fast_string+0xe/0x40 arch/x86/lib/copy_user_64.S:205 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] copyout lib/iov_iter.c:157 [inline] copy_page_to_iter_iovec lib/iov_iter.c:228 [inline] __copy_page_to_iter lib/iov_iter.c:861 [inline] copy_page_to_iter+0x49a/0x10d0 lib/iov_iter.c:889 filemap_read+0x20f6/0x2980 mm/filemap.c:2689 call_read_iter include/linux/fs.h:2097 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0xa9f/0xe10 fs/read_write.c:485 ksys_read+0x1a2/0x2c0 fs/read_write.c:623 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+0x61/0xcb other info that might help us debug this: Chain exists of: &sbi->lock --> &mm->mmap_lock#2 --> sb_pagefaults Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_pagefaults); lock(&mm->mmap_lock#2); lock(sb_pagefaults); lock(&sbi->lock); *** DEADLOCK *** 3 locks held by syz-executor392/3498: #0: ffff88807f56e870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x21c/0x2b0 fs/file.c:1072 #1: ffff888078798f28 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] #1: ffff888078798f28 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] #1: ffff888078798f28 (&mm->mmap_lock#2){++++}-{3:3}, at: handle_page_fault arch/x86/mm/fault.c:1485 [inline] #1: ffff888078798f28 (&mm->mmap_lock#2){++++}-{3:3}, at: exc_page_fault+0x181/0x740 arch/x86/mm/fault.c:1541 #2: ffff888078012558 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x1a9/0x440 mm/memory.c:2892 stack backtrace: CPU: 0 PID: 3498 Comm: syz-executor392 Not tainted 5.15.124-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 reiserfs_write_lock+0x76/0xd0 fs/reiserfs/lock.c:27 reiserfs_dirty_inode+0xee/0x240 fs/reiserfs/super.c:704 __mark_inode_dirty+0x2fd/0xd60 fs/fs-writeback.c:2442 generic_update_time+0x1cb/0x1e0 fs/inode.c:1817 inode_update_time fs/inode.c:1830 [inline] file_update_time+0x3eb/0x460 fs/inode.c:2019 filemap_page_mkwrite+0x222/0x650 mm/filemap.c:3359 do_page_mkwrite+0x1a9/0x440 mm/memory.c:2892 do_shared_fault mm/memory.c:4298 [inline] do_fault mm/memory.c:4366 [inline] handle_pte_fault mm/memory.c:4621 [inline] __handle_mm_fault mm/memory.c:4756 [inline] handle_mm_fault+0x2803/0x5950 mm/memory.c:4854 do_user_addr_fault arch/x86/mm/fault.c:1397 [inline] handle_page_fault arch/x86/mm/fault.c:1485 [inline] exc_page_fault+0x271/0x740 arch/x86/mm/fault.c:1541 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:568 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x40 arch/x86/lib/copy_user_64.S:206 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 0f 1f 80 00 00 00 00 0f 01 cb 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 01 ca c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 83 f8 RSP: 0018:ffffc900020ef8b0 EFLAGS: 00050206 RAX: ffffffff84049c01 RBX: 0000000020002740 RCX: 0000000000001000 RDX: 0000000000001000 RSI: ffff888072dc8000 RDI: 0000000020001740 RBP: ffffc900020efd20 R08: dffffc0000000000 R09: ffffed100e5b9200 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000020001740 R13: 0000000000001000 R14: ffff888072dc8000 R15: 00007ffffffff000 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] copyout lib/iov_iter.c:157 [inline] copy_page_to_iter_iovec lib/iov_iter.c:228 [inline] __copy_page_to_iter lib/iov_iter.c:861 [inline] copy_page_to_iter+0x49a/0x10d0 lib/iov_iter.c:889 filemap_read+0x20f6/0x2980 mm/filemap.c:2689 call_read_iter include/linux/fs.h:2097 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0xa9f/0xe10 fs/read_write.c:485 ksys_read+0x1a2/0x2c0 fs/read_write.c:623 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+0x61/0xcb RIP: 0033:0x7f343c133c79 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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 ---------------- Code disassembly (best guess): 0: 89 d1 mov %edx,%ecx 2: c1 e9 03 shr $0x3,%ecx 5: 83 e2 07 and $0x7,%edx 8: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi) b: 89 d1 mov %edx,%ecx d: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) f: 31 c0 xor %eax,%eax 11: 0f 01 ca clac 14: c3 ret 15: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 1c: 0f 01 cb stac 1f: 83 fa 40 cmp $0x40,%edx 22: 0f 82 70 ff ff ff jb 0xffffff98 28: 89 d1 mov %edx,%ecx * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 31 c0 xor %eax,%eax 2e: 0f 01 ca clac 31: c3 ret 32: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 39: 00 00 00 3c: 89 d1 mov %edx,%ecx 3e: 83 .byte 0x83 3f: f8 clc