====================================================== WARNING: possible circular locking dependency detected 6.6.0-rc7-syzkaller-g8de1e7afcc1c #0 Not tainted ------------------------------------------------------ syz-executor.4/12695 is trying to acquire lock: ffff000126f74090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 but task is already holding lock: ffff0000d6318508 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x140/0x2dc mm/memory.c:2931 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_pagefaults#2){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1571 [inline] sb_start_pagefault include/linux/fs.h:1675 [inline] filemap_page_mkwrite+0x14c/0x920 mm/filemap.c:3628 do_page_mkwrite+0x140/0x2dc mm/memory.c:2931 wp_page_shared mm/memory.c:3291 [inline] do_wp_page+0xb6c/0x2f4c mm/memory.c:3376 handle_pte_fault mm/memory.c:4994 [inline] __handle_mm_fault mm/memory.c:5119 [inline] handle_mm_fault+0x11b0/0x49fc mm/memory.c:5284 __do_page_fault arch/arm64/mm/fault.c:513 [inline] do_page_fault+0x4e8/0xa54 arch/arm64/mm/fault.c:626 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:846 el0_da+0x60/0x168 arch/arm64/kernel/entry-common.c:546 el0t_64_sync_handler+0xcc/0xfc arch/arm64/kernel/entry-common.c:699 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 -> #1 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc4/0x124 mm/memory.c:5896 reiserfs_ioctl+0x110/0x42c fs/reiserfs/ioctl.c:96 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 -> #0 (&sbi->lock){+.+.}-{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+0x3370/0x75e8 kernel/locking/lockdep.c:5136 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5753 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 reiserfs_dirty_inode+0xe4/0x204 fs/reiserfs/super.c:704 __mark_inode_dirty+0x2b0/0x10f4 fs/fs-writeback.c:2435 generic_update_time fs/inode.c:1936 [inline] inode_update_time fs/inode.c:1949 [inline] __file_update_time fs/inode.c:2135 [inline] file_update_time+0x184/0x1ac fs/inode.c:2165 filemap_page_mkwrite+0x2f8/0x920 mm/filemap.c:3629 do_page_mkwrite+0x140/0x2dc mm/memory.c:2931 wp_page_shared mm/memory.c:3291 [inline] do_wp_page+0xb6c/0x2f4c mm/memory.c:3376 handle_pte_fault mm/memory.c:4994 [inline] __handle_mm_fault mm/memory.c:5119 [inline] handle_mm_fault+0x11b0/0x49fc mm/memory.c:5284 __do_page_fault arch/arm64/mm/fault.c:513 [inline] do_page_fault+0x4e8/0xa54 arch/arm64/mm/fault.c:626 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:846 el0_da+0x60/0x168 arch/arm64/kernel/entry-common.c:546 el0t_64_sync_handler+0xcc/0xfc arch/arm64/kernel/entry-common.c:699 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 other info that might help us debug this: Chain exists of: &sbi->lock --> &mm->mmap_lock --> sb_pagefaults#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_pagefaults#2); lock(&mm->mmap_lock); lock(sb_pagefaults#2); lock(&sbi->lock); *** DEADLOCK *** 2 locks held by syz-executor.4/12695: #0: ffff0000dcce7190 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline] #0: ffff0000dcce7190 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5311 [inline] #0: ffff0000dcce7190 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x38/0x2d8 mm/memory.c:5371 #1: ffff0000d6318508 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x140/0x2dc mm/memory.c:2931 stack backtrace: CPU: 0 PID: 12695 Comm: syz-executor.4 Not tainted 6.6.0-rc7-syzkaller-g8de1e7afcc1c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2060 check_noncircular+0x310/0x404 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+0x3370/0x75e8 kernel/locking/lockdep.c:5136 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5753 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 reiserfs_write_lock+0x7c/0xe8 fs/reiserfs/lock.c:27 reiserfs_dirty_inode+0xe4/0x204 fs/reiserfs/super.c:704 __mark_inode_dirty+0x2b0/0x10f4 fs/fs-writeback.c:2435 generic_update_time fs/inode.c:1936 [inline] inode_update_time fs/inode.c:1949 [inline] __file_update_time fs/inode.c:2135 [inline] file_update_time+0x184/0x1ac fs/inode.c:2165 filemap_page_mkwrite+0x2f8/0x920 mm/filemap.c:3629 do_page_mkwrite+0x140/0x2dc mm/memory.c:2931 wp_page_shared mm/memory.c:3291 [inline] do_wp_page+0xb6c/0x2f4c mm/memory.c:3376 handle_pte_fault mm/memory.c:4994 [inline] __handle_mm_fault mm/memory.c:5119 [inline] handle_mm_fault+0x11b0/0x49fc mm/memory.c:5284 __do_page_fault arch/arm64/mm/fault.c:513 [inline] do_page_fault+0x4e8/0xa54 arch/arm64/mm/fault.c:626 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:846 el0_da+0x60/0x168 arch/arm64/kernel/entry-common.c:546 el0t_64_sync_handler+0xcc/0xfc arch/arm64/kernel/entry-common.c:699 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595