ldm_validate_partition_table(): Disk read failed. Dev nbd3: unable to read RDB block 0 nbd3: unable to read partition table ====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc2-syzkaller-00303-gad1b832bf1cf #0 Not tainted ------------------------------------------------------ udevd/16806 is trying to acquire lock: ffff88804420eee8 (&q->q_usage_counter(io)#52){++++}-{0:0}, at: __submit_bio+0x3d1/0x690 block/blk-core.c:628 but task is already holding lock: ffff888045364e40 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] ffff888045364e40 (mapping.invalidate_lock#2){++++}-{4:4}, at: page_cache_ra_unbounded+0x173/0x7d0 mm/readahead.c:229 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (mapping.invalidate_lock#2){++++}-{4:4}: down_read+0x9a/0x330 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] page_cache_ra_unbounded+0x173/0x7d0 mm/readahead.c:229 do_page_cache_ra mm/readahead.c:328 [inline] page_cache_ra_order+0x9cd/0xd00 mm/readahead.c:533 do_sync_mmap_readahead mm/filemap.c:3260 [inline] filemap_fault+0x16d2/0x2ca0 mm/filemap.c:3447 __do_fault+0x10a/0x490 mm/memory.c:4977 do_read_fault mm/memory.c:5392 [inline] do_fault mm/memory.c:5526 [inline] do_pte_missing+0xecf/0x3e10 mm/memory.c:4047 handle_pte_fault mm/memory.c:5889 [inline] __handle_mm_fault+0x1166/0x2c60 mm/memory.c:6032 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6201 do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1388 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] _inline_copy_from_user include/linux/uaccess.h:178 [inline] _copy_from_user+0x93/0xd0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] copy_from_sockptr_offset.constprop.0+0x157/0x190 include/linux/sockptr.h:48 copy_from_sockptr include/linux/sockptr.h:61 [inline] compat_ip_set_mcast_msfilter net/ipv4/ip_sockglue.c:821 [inline] do_ip_setsockopt+0x1f97/0x3680 net/ipv4/ip_sockglue.c:1338 ip_setsockopt+0x59/0xf0 net/ipv4/ip_sockglue.c:1417 udp_setsockopt+0x7d/0xd0 net/ipv4/udp.c:3053 do_sock_setsockopt+0x222/0x480 net/socket.c:2303 __sys_setsockopt+0x1a0/0x230 net/socket.c:2328 __do_sys_setsockopt net/socket.c:2334 [inline] __se_sys_setsockopt net/socket.c:2331 [inline] __ia32_sys_setsockopt+0xbc/0x160 net/socket.c:2331 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #5 (sk_lock-AF_INET){+.+.}-{0:0}: lock_sock_nested+0x3a/0xf0 net/core/sock.c:3645 lock_sock include/net/sock.h:1624 [inline] inet_autobind+0x1a/0x1a0 net/ipv4/af_inet.c:178 inet_send_prepare+0x317/0x530 net/ipv4/af_inet.c:837 inet_sendmsg+0x43/0x140 net/ipv4/af_inet.c:848 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:733 [inline] sock_sendmsg+0x389/0x490 net/socket.c:756 __sock_xmit+0x1e8/0x4f0 drivers/block/nbd.c:574 sock_xmit drivers/block/nbd.c:602 [inline] send_disconnects drivers/block/nbd.c:1395 [inline] nbd_disconnect+0x390/0x540 drivers/block/nbd.c:1410 __nbd_ioctl drivers/block/nbd.c:1580 [inline] nbd_ioctl+0x8d1/0xd60 drivers/block/nbd.c:1642 compat_blkdev_ioctl+0x2f4/0x7b0 block/ioctl.c:749 __do_compat_sys_ioctl+0x1cb/0x2c0 fs/ioctl.c:1004 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #4 (&nsock->tx_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730 nbd_handle_cmd drivers/block/nbd.c:1140 [inline] nbd_queue_rq+0x424/0x1220 drivers/block/nbd.c:1204 blk_mq_dispatch_rq_list+0x443/0x1dc0 block/blk-mq.c:2120 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline] __blk_mq_sched_dispatch_requests+0xcdf/0x1620 block/blk-mq-sched.c:309 blk_mq_sched_dispatch_requests+0xd8/0x1b0 block/blk-mq-sched.c:331 blk_mq_run_work_fn+0x135/0x380 block/blk-mq.c:2530 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3317 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #3 (&cmd->lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730 nbd_queue_rq+0xbe/0x1220 drivers/block/nbd.c:1196 blk_mq_dispatch_rq_list+0x443/0x1dc0 block/blk-mq.c:2120 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline] __blk_mq_sched_dispatch_requests+0xcdf/0x1620 block/blk-mq-sched.c:309 blk_mq_sched_dispatch_requests+0xd8/0x1b0 block/blk-mq-sched.c:331 blk_mq_run_work_fn+0x135/0x380 block/blk-mq.c:2530 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3317 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #2 (set->srcu){.+.+}-{0:0}: srcu_lock_sync include/linux/srcu.h:176 [inline] __synchronize_srcu+0xa9/0x2a0 kernel/rcu/srcutree.c:1418 blk_mq_wait_quiesce_done block/blk-mq.c:293 [inline] blk_mq_wait_quiesce_done block/blk-mq.c:290 [inline] blk_mq_quiesce_queue block/blk-mq.c:313 [inline] blk_mq_quiesce_queue+0x149/0x1b0 block/blk-mq.c:308 elevator_disable+0xe9/0x570 block/elevator.c:661 blk_mq_elv_switch_none block/blk-mq.c:4951 [inline] __blk_mq_update_nr_hw_queues block/blk-mq.c:5018 [inline] blk_mq_update_nr_hw_queues+0x41c/0x1360 block/blk-mq.c:5070 nbd_start_device+0x172/0xcd0 drivers/block/nbd.c:1476 nbd_start_device_ioctl drivers/block/nbd.c:1527 [inline] __nbd_ioctl drivers/block/nbd.c:1602 [inline] nbd_ioctl+0x21a/0xd60 drivers/block/nbd.c:1642 compat_blkdev_ioctl+0x2f4/0x7b0 block/ioctl.c:749 __do_compat_sys_ioctl+0x1cb/0x2c0 fs/ioctl.c:1004 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #1 (&q->sysfs_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730 blk_mq_elv_switch_none block/blk-mq.c:4937 [inline] __blk_mq_update_nr_hw_queues block/blk-mq.c:5018 [inline] blk_mq_update_nr_hw_queues+0x4a7/0x1360 block/blk-mq.c:5070 nbd_start_device+0x172/0xcd0 drivers/block/nbd.c:1476 nbd_start_device_ioctl drivers/block/nbd.c:1527 [inline] __nbd_ioctl drivers/block/nbd.c:1602 [inline] nbd_ioctl+0x21a/0xd60 drivers/block/nbd.c:1642 compat_blkdev_ioctl+0x2f4/0x7b0 block/ioctl.c:749 __do_compat_sys_ioctl+0x1cb/0x2c0 fs/ioctl.c:1004 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #0 (&q->q_usage_counter(io)#52){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain kernel/locking/lockdep.c:3906 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851 bio_queue_enter block/blk.h:77 [inline] blk_mq_submit_bio+0x20db/0x25f0 block/blk-mq.c:3091 __submit_bio+0x3d1/0x690 block/blk-core.c:628 __submit_bio_noacct_mq block/blk-core.c:715 [inline] submit_bio_noacct_nocheck+0x698/0xd70 block/blk-core.c:744 submit_bio_noacct+0x50d/0x1ec0 block/blk-core.c:867 mpage_bio_submit_read fs/mpage.c:75 [inline] mpage_readahead+0x41d/0x590 fs/mpage.c:377 read_pages+0x1a7/0xc60 mm/readahead.c:161 page_cache_ra_unbounded+0x426/0x7d0 mm/readahead.c:298 do_page_cache_ra mm/readahead.c:328 [inline] force_page_cache_ra+0x24b/0x340 mm/readahead.c:357 page_cache_sync_ra+0x158/0xa30 mm/readahead.c:585 filemap_get_pages+0xb62/0x1c30 mm/filemap.c:2580 filemap_read+0x3c5/0xe70 mm/filemap.c:2691 blkdev_read_iter+0x187/0x4b0 block/fops.c:796 new_sync_read fs/read_write.c:484 [inline] vfs_read+0x886/0xbf0 fs/read_write.c:565 ksys_read+0x12b/0x250 fs/read_write.c:708 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &q->q_usage_counter(io)#52 --> sk_lock-AF_INET --> mapping.invalidate_lock#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(mapping.invalidate_lock#2); lock(sk_lock-AF_INET); lock(mapping.invalidate_lock#2); rlock(&q->q_usage_counter(io)#52); *** DEADLOCK *** 1 lock held by udevd/16806: #0: ffff888045364e40 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] #0: ffff888045364e40 (mapping.invalidate_lock#2){++++}-{4:4}, at: page_cache_ra_unbounded+0x173/0x7d0 mm/readahead.c:229 stack backtrace: CPU: 0 UID: 0 PID: 16806 Comm: udevd Not tainted 6.14.0-rc2-syzkaller-00303-gad1b832bf1cf #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x490/0x760 kernel/locking/lockdep.c:2076 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain kernel/locking/lockdep.c:3906 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851 bio_queue_enter block/blk.h:77 [inline] blk_mq_submit_bio+0x20db/0x25f0 block/blk-mq.c:3091 __submit_bio+0x3d1/0x690 block/blk-core.c:628 __submit_bio_noacct_mq block/blk-core.c:715 [inline] submit_bio_noacct_nocheck+0x698/0xd70 block/blk-core.c:744 submit_bio_noacct+0x50d/0x1ec0 block/blk-core.c:867 mpage_bio_submit_read fs/mpage.c:75 [inline] mpage_readahead+0x41d/0x590 fs/mpage.c:377 read_pages+0x1a7/0xc60 mm/readahead.c:161 page_cache_ra_unbounded+0x426/0x7d0 mm/readahead.c:298 do_page_cache_ra mm/readahead.c:328 [inline] force_page_cache_ra+0x24b/0x340 mm/readahead.c:357 page_cache_sync_ra+0x158/0xa30 mm/readahead.c:585 filemap_get_pages+0xb62/0x1c30 mm/filemap.c:2580 filemap_read+0x3c5/0xe70 mm/filemap.c:2691 blkdev_read_iter+0x187/0x4b0 block/fops.c:796 new_sync_read fs/read_write.c:484 [inline] vfs_read+0x886/0xbf0 fs/read_write.c:565 ksys_read+0x12b/0x250 fs/read_write.c:708 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f221ad16b6a Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007fff67246588 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00000007ffff0000 RCX: 00007f221ad16b6a RDX: 0000000000000040 RSI: 0000560c28e492f8 RDI: 0000000000000009 RBP: 0000000000000040 R08: 0000560c28e492d0 R09: 00007f221adf1b60 R10: 0000000000000004 R11: 0000000000000246 R12: 0000560c28e492d0 R13: 0000560c28e492e8 R14: 0000560c28e51ad8 R15: 0000560c28e51a80