loop0: detected capacity change from 0 to 4 EXT4-fs (loop0): Invalid default hash set in the superblock ====================================================== WARNING: possible circular locking dependency detected 6.12.0-rc7-next-20241115 #1 Not tainted ------------------------------------------------------ systemd-udevd/12339 is trying to acquire lock: ffff88800b7b80a8 (&q->q_usage_counter(io)#9){++++}-{0:0}, at: __submit_bio+0x180/0x490 but task is already holding lock: ffff888009051470 (mapping.invalidate_lock#2){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x14e/0x670 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (mapping.invalidate_lock#2){.+.+}-{4:4}: down_read+0x9a/0x320 filemap_fault+0xc66/0x2cb0 __do_fault+0x10d/0x480 __handle_mm_fault+0x122b/0x2f50 handle_mm_fault+0x2b4/0x6a0 __get_user_pages+0x59d/0x3820 populate_vma_page_range+0x287/0x3b0 __mm_populate+0x101/0x3a0 vm_mmap_pgoff+0x2c0/0x390 ksys_mmap_pgoff+0x3d7/0x520 __x64_sys_mmap+0x127/0x190 do_syscall_64+0xbf/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #4 (&mm->mmap_lock){++++}-{4:4}: __might_fault+0x110/0x190 _copy_from_user+0x2b/0xd0 __blk_trace_setup+0x96/0x180 blk_trace_setup+0x47/0x70 sg_ioctl+0x69f/0x26b0 __x64_sys_ioctl+0x1a7/0x210 do_syscall_64+0xbf/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (&q->debugfs_mutex){+.+.}-{4:4}: __mutex_lock+0x13d/0xac0 blk_mq_init_sched+0x429/0x670 elevator_init_mq+0x2cc/0x410 add_disk_fwnode+0x113/0x1310 sd_probe+0xa82/0xf20 really_probe+0x240/0x820 __driver_probe_device+0x2c4/0x380 driver_probe_device+0x4e/0x2a0 __device_attach_driver+0x1d4/0x390 bus_for_each_drv+0x14c/0x1d0 __device_attach_async_helper+0x1d1/0x260 async_run_entry_fn+0x91/0x290 process_one_work+0x8ee/0x1a00 worker_thread+0x674/0xe70 kthread+0x2c2/0x3a0 ret_from_fork+0x48/0x80 ret_from_fork_asm+0x1a/0x30 -> #2 (&q->q_usage_counter(queue)){++++}-{0:0}: blk_queue_enter+0x4d0/0x600 blk_mq_alloc_request+0x1cd/0x250 scsi_execute_cmd+0x20a/0xe80 read_capacity_16+0x1eb/0xe60 sd_revalidate_disk.isra.0+0x177c/0xa8a0 sd_probe+0x8f9/0xf20 really_probe+0x240/0x820 __driver_probe_device+0x2c4/0x380 driver_probe_device+0x4e/0x2a0 __device_attach_driver+0x1d4/0x390 bus_for_each_drv+0x14c/0x1d0 __device_attach_async_helper+0x1d1/0x260 async_run_entry_fn+0x91/0x290 process_one_work+0x8ee/0x1a00 worker_thread+0x674/0xe70 kthread+0x2c2/0x3a0 ret_from_fork+0x48/0x80 ret_from_fork_asm+0x1a/0x30 -> #1 (&q->limits_lock){+.+.}-{4:4}: __mutex_lock+0x13d/0xac0 loop_reconfigure_limits+0x1eb/0x8e0 lo_ioctl+0xb9c/0x18f0 blkdev_ioctl+0x27e/0x6d0 __x64_sys_ioctl+0x1a7/0x210 do_syscall_64+0xbf/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&q->q_usage_counter(io)#9){++++}-{0:0}: __lock_acquire+0x2930/0x4430 lock_acquire.part.0+0xeb/0x320 blk_mq_submit_bio+0x1ecf/0x2580 __submit_bio+0x180/0x490 submit_bio_noacct_nocheck+0x641/0xcc0 submit_bio_noacct+0x3b3/0x13a0 do_mpage_readpage+0xfba/0x1520 mpage_readahead+0x341/0x590 read_pages+0x19e/0xc70 page_cache_ra_unbounded+0x353/0x670 force_page_cache_ra+0x259/0x370 page_cache_sync_ra+0x104/0xa60 filemap_get_pages+0x329/0x1880 filemap_read+0x389/0xbc0 blkdev_read_iter+0x18a/0x480 vfs_read+0x85a/0xbd0 ksys_read+0x122/0x240 do_syscall_64+0xbf/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &q->q_usage_counter(io)#9 --> &mm->mmap_lock --> mapping.invalidate_lock#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(mapping.invalidate_lock#2); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#2); rlock(&q->q_usage_counter(io)#9); *** DEADLOCK *** 1 lock held by systemd-udevd/12339: #0: ffff888009051470 (mapping.invalidate_lock#2){.+.+}-{4:4}, at: page_cache_ra_unbounded+0x14e/0x670 stack backtrace: CPU: 0 UID: 0 PID: 12339 Comm: systemd-udevd Not tainted 6.12.0-rc7-next-20241115 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xca/0x120 print_circular_bug+0x53f/0x820 check_noncircular+0x2e9/0x3c0 __lock_acquire+0x2930/0x4430 lock_acquire.part.0+0xeb/0x320 blk_mq_submit_bio+0x1ecf/0x2580 __submit_bio+0x180/0x490 submit_bio_noacct_nocheck+0x641/0xcc0 submit_bio_noacct+0x3b3/0x13a0 do_mpage_readpage+0xfba/0x1520 mpage_readahead+0x341/0x590 read_pages+0x19e/0xc70 page_cache_ra_unbounded+0x353/0x670 force_page_cache_ra+0x259/0x370 page_cache_sync_ra+0x104/0xa60 filemap_get_pages+0x329/0x1880 filemap_read+0x389/0xbc0 blkdev_read_iter+0x18a/0x480 vfs_read+0x85a/0xbd0 ksys_read+0x122/0x240 do_syscall_64+0xbf/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f56afd7b04e Code: 0f 1f 40 00 48 8b 15 79 9f 00 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb ba 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 66 0f 1f 84 00 00 00 00 00 48 83 ec 28 RSP: 002b:00007fff6b409878 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000055a092444d58 RCX: 00007f56afd7b04e RDX: 0000000000000400 RSI: 000055a092444d68 RDI: 0000000000000010 RBP: 000055a092469840 R08: 000055a092444d40 R09: 00007f56afd61be0 R10: 0000000000000040 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000400 R14: 000055a092444d40 R15: 000055a092469890