Hello, syzbot found the following issue on: HEAD commit: 7b1d1d4cfac0 Merge remote-tracking branch 'iommu/arm/smmu'.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=1186dd30580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9bc44a6de1ceb5d6 dashboard link: https://syzkaller.appspot.com/bug?extid=969eb4c3dd28b1dc507a compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4d4a0162c7c3/disk-7b1d1d4c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a8c47a4be472/vmlinux-7b1d1d4c.xz kernel image: https://storage.googleapis.com/syzbot-assets/0e173b91f83e/Image-7b1d1d4c.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+969eb4c3dd28b1dc507a@xxxxxxxxxxxxxxxxxxxxxxxxx ====================================================== WARNING: possible circular locking dependency detected 6.12.0-syzkaller-g7b1d1d4cfac0 #0 Not tainted ------------------------------------------------------ syz.3.235/8073 is trying to acquire lock: ffff0000dba0e188 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0x9c/0x124 mm/memory.c:6715 but task is already holding lock: ffff0000c9c4c5d0 (&dev->mode_config.idr_mutex){+.+.}-{3:3}, at: drm_mode_get_lease_ioctl+0x1ec/0x63c drivers/gpu/drm/drm_lease.c:660 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (&dev->mode_config.idr_mutex){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 __drm_mode_object_add+0xb8/0x204 drivers/gpu/drm/drm_mode_object.c:47 drm_framebuffer_init+0x104/0x24c drivers/gpu/drm/drm_framebuffer.c:873 drm_gem_fb_init drivers/gpu/drm/drm_gem_framebuffer_helper.c:82 [inline] drm_gem_fb_init_with_funcs+0x9bc/0xd64 drivers/gpu/drm/drm_gem_framebuffer_helper.c:202 drm_gem_fb_create_with_funcs drivers/gpu/drm/drm_gem_framebuffer_helper.c:245 [inline] drm_gem_fb_create+0x84/0xd4 drivers/gpu/drm/drm_gem_framebuffer_helper.c:286 drm_internal_framebuffer_create+0x100c/0x1408 drivers/gpu/drm/drm_framebuffer.c:303 drm_mode_addfb2+0xb4/0x2a8 drivers/gpu/drm/drm_framebuffer.c:337 drm_client_buffer_addfb drivers/gpu/drm/drm_client.c:480 [inline] drm_client_framebuffer_create+0x38c/0x6cc drivers/gpu/drm/drm_client.c:522 drm_fbdev_shmem_helper_fb_probe+0x1a4/0x728 drivers/gpu/drm/drm_fbdev_shmem.c:126 drm_fb_helper_single_fb_probe drivers/gpu/drm/drm_fb_helper.c:1669 [inline] __drm_fb_helper_initial_config_and_unlock+0x12e8/0x19a4 drivers/gpu/drm/drm_fb_helper.c:1847 drm_fb_helper_initial_config+0x48/0x64 drivers/gpu/drm/drm_fb_helper.c:1934 drm_fbdev_shmem_client_hotplug+0x158/0x22c drivers/gpu/drm/drm_fbdev_shmem.c:250 drm_client_register+0x144/0x1e0 drivers/gpu/drm/drm_client.c:141 drm_fbdev_shmem_setup+0x11c/0x2cc drivers/gpu/drm/drm_fbdev_shmem.c:309 vkms_create drivers/gpu/drm/vkms/vkms_drv.c:228 [inline] vkms_init+0x4f0/0x600 drivers/gpu/drm/vkms/vkms_drv.c:254 do_one_initcall+0x24c/0x9c0 init/main.c:1269 do_initcall_level+0x154/0x214 init/main.c:1331 do_initcalls+0x58/0xac init/main.c:1347 do_basic_setup+0x8c/0xa0 init/main.c:1366 kernel_init_freeable+0x324/0x478 init/main.c:1580 kernel_init+0x24/0x2a0 init/main.c:1469 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 -> #5 (&helper->lock){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 __drm_fb_helper_restore_fbdev_mode_unlocked+0xb4/0x178 drivers/gpu/drm/drm_fb_helper.c:228 drm_fb_helper_set_par+0xc4/0x110 drivers/gpu/drm/drm_fb_helper.c:1345 fbcon_init+0xf34/0x1eb8 drivers/video/fbdev/core/fbcon.c:1113 visual_init+0x27c/0x548 drivers/tty/vt/vt.c:1011 do_bind_con_driver+0x7dc/0xe04 drivers/tty/vt/vt.c:3833 do_take_over_console+0x4ac/0x5f0 drivers/tty/vt/vt.c:4399 do_fbcon_takeover+0x158/0x260 drivers/video/fbdev/core/fbcon.c:549 do_fb_registered drivers/video/fbdev/core/fbcon.c:2988 [inline] fbcon_fb_registered+0x370/0x4ec drivers/video/fbdev/core/fbcon.c:3008 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:449 [inline] register_framebuffer+0x470/0x610 drivers/video/fbdev/core/fbmem.c:515 __drm_fb_helper_initial_config_and_unlock+0x13b0/0x19a4 drivers/gpu/drm/drm_fb_helper.c:1869 drm_fb_helper_initial_config+0x48/0x64 drivers/gpu/drm/drm_fb_helper.c:1934 drm_fbdev_shmem_client_hotplug+0x158/0x22c drivers/gpu/drm/drm_fbdev_shmem.c:250 drm_client_register+0x144/0x1e0 drivers/gpu/drm/drm_client.c:141 drm_fbdev_shmem_setup+0x11c/0x2cc drivers/gpu/drm/drm_fbdev_shmem.c:309 vkms_create drivers/gpu/drm/vkms/vkms_drv.c:228 [inline] vkms_init+0x4f0/0x600 drivers/gpu/drm/vkms/vkms_drv.c:254 do_one_initcall+0x24c/0x9c0 init/main.c:1269 do_initcall_level+0x154/0x214 init/main.c:1331 do_initcalls+0x58/0xac init/main.c:1347 do_basic_setup+0x8c/0xa0 init/main.c:1366 kernel_init_freeable+0x324/0x478 init/main.c:1580 kernel_init+0x24/0x2a0 init/main.c:1469 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 -> #4 (console_lock){+.+.}-{0:0}: console_lock+0x19c/0x1f4 kernel/printk/printk.c:2808 __bch2_print_string_as_lines fs/bcachefs/util.c:267 [inline] bch2_print_string_as_lines+0x2c/0xd4 fs/bcachefs/util.c:286 __bch2_fsck_err+0x1864/0x2544 fs/bcachefs/error.c:411 bch2_check_fix_ptr fs/bcachefs/buckets.c:112 [inline] bch2_check_fix_ptrs+0x15b8/0x515c fs/bcachefs/buckets.c:266 bch2_trigger_extent+0x71c/0x814 fs/bcachefs/buckets.c:856 bch2_key_trigger fs/bcachefs/bkey_methods.h:87 [inline] bch2_gc_mark_key+0x4b4/0xb70 fs/bcachefs/btree_gc.c:634 bch2_gc_btree fs/bcachefs/btree_gc.c:670 [inline] bch2_gc_btrees fs/bcachefs/btree_gc.c:729 [inline] bch2_check_allocations+0x1018/0x48f4 fs/bcachefs/btree_gc.c:1133 bch2_run_recovery_pass+0xe4/0x1d4 fs/bcachefs/recovery_passes.c:191 bch2_run_recovery_passes+0x30c/0x73c fs/bcachefs/recovery_passes.c:244 bch2_fs_recovery+0x32d8/0x55dc fs/bcachefs/recovery.c:861 bch2_fs_start+0x30c/0x53c fs/bcachefs/super.c:1037 bch2_fs_get_tree+0x938/0x1030 fs/bcachefs/fs.c:2170 vfs_get_tree+0x90/0x28c fs/super.c:1814 do_new_mount+0x278/0x900 fs/namespace.c:3507 path_mount+0x590/0xe04 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount fs/namespace.c:4034 [inline] __arm64_sys_mount+0x4d4/0x5ac fs/namespace.c:4034 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #3 (&c->fsck_error_msgs_lock){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 __bch2_fsck_err+0x344/0x2544 fs/bcachefs/error.c:282 bch2_check_fix_ptr fs/bcachefs/buckets.c:112 [inline] bch2_check_fix_ptrs+0x15b8/0x515c fs/bcachefs/buckets.c:266 bch2_trigger_extent+0x71c/0x814 fs/bcachefs/buckets.c:856 bch2_key_trigger fs/bcachefs/bkey_methods.h:87 [inline] bch2_gc_mark_key+0x4b4/0xb70 fs/bcachefs/btree_gc.c:634 bch2_gc_btree fs/bcachefs/btree_gc.c:670 [inline] bch2_gc_btrees fs/bcachefs/btree_gc.c:729 [inline] bch2_check_allocations+0x1018/0x48f4 fs/bcachefs/btree_gc.c:1133 bch2_run_recovery_pass+0xe4/0x1d4 fs/bcachefs/recovery_passes.c:191 bch2_run_recovery_passes+0x30c/0x73c fs/bcachefs/recovery_passes.c:244 bch2_fs_recovery+0x32d8/0x55dc fs/bcachefs/recovery.c:861 bch2_fs_start+0x30c/0x53c fs/bcachefs/super.c:1037 bch2_fs_get_tree+0x938/0x1030 fs/bcachefs/fs.c:2170 vfs_get_tree+0x90/0x28c fs/super.c:1814 do_new_mount+0x278/0x900 fs/namespace.c:3507 path_mount+0x590/0xe04 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount fs/namespace.c:4034 [inline] __arm64_sys_mount+0x4d4/0x5ac fs/namespace.c:4034 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #2 (&c->mark_lock){++++}-{0:0}: percpu_down_read+0x5c/0x2e8 include/linux/percpu-rwsem.h:51 __bch2_disk_reservation_add+0xc4/0x9f4 fs/bcachefs/buckets.c:1170 bch2_disk_reservation_add+0x29c/0x4f4 fs/bcachefs/buckets.h:367 __bch2_folio_reservation_get+0x2dc/0x798 fs/bcachefs/fs-io-pagecache.c:428 bch2_folio_reservation_get fs/bcachefs/fs-io-pagecache.c:477 [inline] bch2_page_mkwrite+0xa70/0xe44 fs/bcachefs/fs-io-pagecache.c:637 do_page_mkwrite+0x140/0x2dc mm/memory.c:3162 do_shared_fault mm/memory.c:5373 [inline] do_fault mm/memory.c:5435 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault mm/memory.c:5766 [inline] __handle_mm_fault+0x1e1c/0x66e8 mm/memory.c:5909 handle_mm_fault+0x29c/0x8b4 mm/memory.c:6077 do_page_fault+0x570/0x10a8 arch/arm64/mm/fault.c:690 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:783 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:919 el0_da+0x60/0x178 arch/arm64/kernel/entry-common.c:604 el0t_64_sync_handler+0xcc/0x108 arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #1 (sb_pagefaults#2){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1716 [inline] sb_start_pagefault include/linux/fs.h:1881 [inline] bch2_page_mkwrite+0x280/0xe44 fs/bcachefs/fs-io-pagecache.c:614 do_page_mkwrite+0x140/0x2dc mm/memory.c:3162 do_shared_fault mm/memory.c:5373 [inline] do_fault mm/memory.c:5435 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault mm/memory.c:5766 [inline] __handle_mm_fault+0x1e1c/0x66e8 mm/memory.c:5909 handle_mm_fault+0x29c/0x8b4 mm/memory.c:6077 do_page_fault+0x570/0x10a8 arch/arm64/mm/fault.c:690 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:783 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:919 el0_da+0x60/0x178 arch/arm64/kernel/entry-common.c:604 el0t_64_sync_handler+0xcc/0x108 arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x33f8/0x77c8 kernel/locking/lockdep.c:5202 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5825 __might_fault+0xc4/0x124 mm/memory.c:6716 drm_mode_get_lease_ioctl+0x318/0x63c drivers/gpu/drm/drm_lease.c:673 drm_ioctl_kernel+0x26c/0x368 drivers/gpu/drm/drm_ioctl.c:745 drm_ioctl+0x624/0xb14 drivers/gpu/drm/drm_ioctl.c:842 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:893 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 other info that might help us debug this: Chain exists of: &mm->mmap_lock --> &helper->lock --> &dev->mode_config.idr_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&dev->mode_config.idr_mutex); lock(&helper->lock); lock(&dev->mode_config.idr_mutex); rlock(&mm->mmap_lock); *** DEADLOCK *** 1 lock held by syz.3.235/8073: #0: ffff0000c9c4c5d0 (&dev->mode_config.idr_mutex){+.+.}-{3:3}, at: drm_mode_get_lease_ioctl+0x1ec/0x63c drivers/gpu/drm/drm_lease.c:660 stack backtrace: CPU: 1 UID: 0 PID: 8073 Comm: syz.3.235 Not tainted 6.12.0-syzkaller-g7b1d1d4cfac0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x154/0x1c0 kernel/locking/lockdep.c:2074 check_noncircular+0x310/0x404 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x33f8/0x77c8 kernel/locking/lockdep.c:5202 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5825 __might_fault+0xc4/0x124 mm/memory.c:6716 drm_mode_get_lease_ioctl+0x318/0x63c drivers/gpu/drm/drm_lease.c:673 drm_ioctl_kernel+0x26c/0x368 drivers/gpu/drm/drm_ioctl.c:745 drm_ioctl+0x624/0xb14 drivers/gpu/drm/drm_ioctl.c:842 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:893 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 --- 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. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
