INFO: task syz.5.168:7050 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.5.168 state:D stack:24384 pid:7050 tgid:7049 ppid:6089 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x145f/0x5070 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7241 rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline] __rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline] __rt_mutex_slowlock_locked+0x1dfe/0x25e0 kernel/locking/rtmutex.c:1760 __rwbase_read_lock+0xbc/0x180 kernel/locking/rwbase_rt.c:114 rwbase_read_lock kernel/locking/rwbase_rt.c:147 [inline] __down_read kernel/locking/rwsem.c:1466 [inline] down_read+0x127/0x1f0 kernel/locking/rwsem.c:1539 inode_lock_shared include/linux/fs.h:1042 [inline] lookup_slow+0x46/0x70 fs/namei.c:1874 walk_component fs/namei.c:2221 [inline] lookup_last fs/namei.c:2722 [inline] path_lookupat+0x3f5/0x8c0 fs/namei.c:2746 filename_lookup+0x212/0x570 fs/namei.c:2775 kern_path+0x35/0x50 fs/namei.c:2987 lookup_bdev block/bdev.c:1222 [inline] bdev_file_open_by_path+0xc8/0x4d0 block/bdev.c:1095 btrfs_scan_one_device+0xa8/0x680 fs/btrfs/volumes.c:1471 btrfs_control_ioctl+0x225/0x360 fs/btrfs/super.c:2254 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f543653f749 RSP: 002b:00007f543479e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5436795fa0 RCX: 00007f543653f749 RDX: 00002000000004c0 RSI: 0000000050009404 RDI: 0000000000000005 RBP: 00007f54365c3f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5436796038 R14: 00007f5436795fa0 R15: 00007fff466b6498 INFO: task syz.5.168:7064 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.5.168 state:D stack:25496 pid:7064 tgid:7049 ppid:6089 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x145f/0x5070 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7241 rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline] __rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline] __rt_mutex_slowlock_locked+0x1dfe/0x25e0 kernel/locking/rtmutex.c:1760 rt_mutex_slowlock+0xb5/0x160 kernel/locking/rtmutex.c:1800 __rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline] rwbase_write_lock+0x14f/0x750 kernel/locking/rwbase_rt.c:244 inode_lock include/linux/fs.h:1027 [inline] open_last_lookups fs/namei.c:4537 [inline] path_openat+0xb53/0x3df0 fs/namei.c:4784 do_filp_open+0x1fa/0x410 fs/namei.c:4814 do_sys_openat2+0x121/0x200 fs/open.c:1430 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1447 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f543653f749 RSP: 002b:00007f543477d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f5436796090 RCX: 00007f543653f749 RDX: 0000000000105842 RSI: 0000200000000340 RDI: ffffffffffffff9c RBP: 00007f54365c3f91 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000ec R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5436796128 R14: 00007f5436796090 R15: 00007fff466b6498 INFO: task syz.5.168:7067 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.5.168 state:D stack:26736 pid:7067 tgid:7049 ppid:6089 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x145f/0x5070 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0x165/0x360 kernel/sched/core.c:6960 io_schedule+0x81/0xe0 kernel/sched/core.c:7789 folio_wait_bit_common+0x6b5/0xb90 mm/filemap.c:1323 folio_lock include/linux/pagemap.h:1159 [inline] release_metapage+0x103/0xab0 fs/jfs/jfs_metapage.c:870 discard_metapage fs/jfs/jfs_metapage.h:88 [inline] __get_metapage+0x9a3/0xde0 fs/jfs/jfs_metapage.c:753 dtSplitPage+0x7f8/0x3b20 fs/jfs/jfs_dtree.c:1471 dtSplitUp fs/jfs/jfs_dtree.c:1092 [inline] dtInsert+0x109b/0x5f40 fs/jfs/jfs_dtree.c:871 jfs_symlink+0x715/0xe60 fs/jfs/namei.c:1020 vfs_symlink+0x29a/0x2d0 fs/namei.c:5514 do_symlinkat+0x1f5/0x3d0 fs/namei.c:5541 __do_sys_symlinkat fs/namei.c:5562 [inline] __se_sys_symlinkat fs/namei.c:5559 [inline] __x64_sys_symlinkat+0x95/0xb0 fs/namei.c:5559 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f543653f749 RSP: 002b:00007f543475c038 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007f5436796180 RCX: 00007f543653f749 RDX: 0000200000000200 RSI: ffffffffffffff9c RDI: 0000200000000080 RBP: 00007f54365c3f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5436796218 R14: 00007f5436796180 R15: 00007fff466b6498 INFO: task syz.5.168:7069 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.5.168 state:D stack:28952 pid:7069 tgid:7049 ppid:6089 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x145f/0x5070 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7241 rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline] __rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline] __rt_mutex_slowlock_locked+0x1dfe/0x25e0 kernel/locking/rtmutex.c:1760 rt_mutex_slowlock+0xb5/0x160 kernel/locking/rtmutex.c:1800 __rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline] rwbase_write_lock+0x14f/0x750 kernel/locking/rwbase_rt.c:244 inode_lock_nested include/linux/fs.h:1072 [inline] __start_dirop fs/namei.c:2864 [inline] start_dirop fs/namei.c:2875 [inline] filename_create+0x1fb/0x360 fs/namei.c:4879 do_mknodat+0x181/0x620 fs/namei.c:5026 __do_sys_mknod fs/namei.c:5076 [inline] __se_sys_mknod fs/namei.c:5074 [inline] __x64_sys_mknod+0x8c/0xa0 fs/namei.c:5074 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f543653f749 RSP: 002b:00007f5434339038 EFLAGS: 00000246 ORIG_RAX: 0000000000000085 RAX: ffffffffffffffda RBX: 00007f5436796270 RCX: 00007f543653f749 RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000200000000080 RBP: 00007f54365c3f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5436796308 R14: 00007f5436796270 R15: 00007fff466b6498 Showing all locks held in the system: 1 lock held by khungtaskd/38: #0: ffffffff8d5ae940 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8d5ae940 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #0: ffffffff8d5ae940 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 4 locks held by kworker/u8:10/1357: #0: ffff88814047b938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3232 [inline] #0: ffff88814047b938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770 kernel/workqueue.c:3340 #1: ffffc900056c7bc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3233 [inline] #1: ffffc900056c7bc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770 kernel/workqueue.c:3340 #2: ffff888064d780d0 (&type->s_umount_key#86){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:563 #3: ffff88805e4228e8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530 fs/jfs/inode.c:108 1 lock held by dhcpcd/5461: #0: ffffffff8e8a58b8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #0: ffffffff8e8a58b8 (rtnl_mutex){+.+.}-{4:4}, at: devinet_ioctl+0x323/0x1b20 net/ipv4/devinet.c:1120 2 locks held by getty/5562: #0: ffff88803039c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x44f/0x1460 drivers/tty/n_tty.c:2211 1 lock held by udevd/5855: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x114/0x360 fs/btrfs/super.c:2267 1 lock held by udevd/5868: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x114/0x360 fs/btrfs/super.c:2267 1 lock held by udevd/5926: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x114/0x360 fs/btrfs/super.c:2267 1 lock held by udevd/5927: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x114/0x360 fs/btrfs/super.c:2267 1 lock held by udevd/5962: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x114/0x360 fs/btrfs/super.c:2267 2 locks held by syz.5.168/7050: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x217/0x360 fs/btrfs/super.c:2249 #1: ffff88805e422cb8 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1042 [inline] #1: ffff88805e422cb8 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: lookup_slow+0x46/0x70 fs/namei.c:1874 2 locks held by syz.5.168/7064: #0: ffff888064d78480 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499 #1: ffff88805e422cb8 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline] #1: ffff88805e422cb8 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: open_last_lookups fs/namei.c:4537 [inline] #1: ffff88805e422cb8 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: path_openat+0xb53/0x3df0 fs/namei.c:4784 4 locks held by syz.5.168/7067: #0: ffff888064d78480 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499 #1: ffff88805e422cb8 (&type->i_mutex_dir_key#16/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1072 [inline] #1: ffff88805e422cb8 (&type->i_mutex_dir_key#16/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2864 [inline] #1: ffff88805e422cb8 (&type->i_mutex_dir_key#16/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2875 [inline] #1: ffff88805e422cb8 (&type->i_mutex_dir_key#16/1){+.+.}-{4:4}, at: filename_create+0x1fb/0x360 fs/namei.c:4879 #2: ffff88805e4228e8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_symlink+0x221/0xe60 fs/jfs/namei.c:925 #3: ffff88805e659f28 (&jfs_ip->commit_mutex/1){+.+.}-{4:4}, at: jfs_symlink+0x23c/0xe60 fs/jfs/namei.c:926 2 locks held by syz.5.168/7069: #0: ffff888064d78480 (sb_writers#24){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499 #1: ffff88805e422cb8 (&type->i_mutex_dir_key#16/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1072 [inline] #1: ffff88805e422cb8 (&type->i_mutex_dir_key#16/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2864 [inline] #1: ffff88805e422cb8 (&type->i_mutex_dir_key#16/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2875 [inline] #1: ffff88805e422cb8 (&type->i_mutex_dir_key#16/1){+.+.}-{4:4}, at: filename_create+0x1fb/0x360 fs/namei.c:4879 1 lock held by syz.1.191/7169: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1854 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x47c/0x1920 fs/btrfs/super.c:2123 1 lock held by syz.3.200/7194: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1854 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x47c/0x1920 fs/btrfs/super.c:2123 1 lock held by syz.2.209/7232: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1854 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x47c/0x1920 fs/btrfs/super.c:2123 1 lock held by syz.6.155/7307: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1854 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x47c/0x1920 fs/btrfs/super.c:2123 1 lock held by udevd/7319: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x114/0x360 fs/btrfs/super.c:2267 1 lock held by syz.7.213/7325: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1854 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x47c/0x1920 fs/btrfs/super.c:2123 1 lock held by udevd/7326: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x114/0x360 fs/btrfs/super.c:2267 1 lock held by syz.8.219/7459: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1854 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x47c/0x1920 fs/btrfs/super.c:2123 1 lock held by udevd/7476: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x114/0x360 fs/btrfs/super.c:2267 1 lock held by udevd/7604: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x114/0x360 fs/btrfs/super.c:2267 1 lock held by syz.9.229/7726: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1854 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x47c/0x1920 fs/btrfs/super.c:2123 3 locks held by kworker/u8:27/7933: #0: ffff88813ff69938 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3232 [inline] #0: ffff88813ff69938 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770 kernel/workqueue.c:3340 #1: ffffc90003aa7bc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3233 [inline] #1: ffffc90003aa7bc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770 kernel/workqueue.c:3340 #2: ffffffff8e8a58b8 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:303 4 locks held by kworker/u8:29/7950: 1 lock held by syz.4.243/7979: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1854 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x47c/0x1920 fs/btrfs/super.c:2123 1 lock held by syz.0.294/8192: #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1854 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_subvol fs/btrfs/super.c:2089 [inline] #0: ffffffff8db773f8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x47c/0x1920 fs/btrfs/super.c:2123 1 lock held by syz-executor/8325: #0: ffffffff8e8a58b8 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:634 [inline] #0: ffffffff8e8a58b8 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x41/0x1c0 drivers/net/tun.c:3436 2 locks held by syz-executor/8444: #0: ffffffff8edcc5d8 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8edcc5d8 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #0: ffffffff8edcc5d8 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250 net/core/rtnetlink.c:570 #1: ffffffff8e8a58b8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #1: ffffffff8e8a58b8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #1: ffffffff8e8a58b8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8ec/0x1c90 net/core/rtnetlink.c:4071 3 locks held by syz.1.422/8611: 1 lock held by syz.3.424/8619: 3 locks held by syz.2.425/8621: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x135/0x170 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline] watchdog+0xf95/0xfe0 kernel/hung_task.c:515 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 7964 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x0/0xa0 kernel/kcov.c:320 Code: 00 00 48 89 7c 0a 10 48 89 74 0a 18 48 89 44 0a 20 c3 cc cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 10 b3 91 65 44 8b 05 c7 RSP: 0018:ffffc900054f7950 EFLAGS: 00000246 RAX: ffffffff8ac93f44 RBX: 0000000000000008 RCX: ffff88802b565ac0 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 RBP: ffffc900054f7b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000003 R12: ffffffffffffffff R13: dffffc0000000000 R14: 0000000000000008 R15: 0000000000000008 FS: 000055556e77c500(0000) GS:ffff888126cef000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055556e7975c8 CR3: 0000000041f80000 CR4: 00000000003526f0 Call Trace: mas_wr_store_type+0xdde/0x19e0 lib/maple_tree.c:3912 mas_wr_preallocate lib/maple_tree.c:3947 [inline] mas_erase+0x3c4/0x8e0 lib/maple_tree.c:5818 mtree_erase+0xf0/0x150 lib/maple_tree.c:6156 simple_offset_remove+0x58/0x90 fs/libfs.c:333 shmem_unlink+0x16d/0x250 mm/shmem.c:3987 vfs_unlink+0x386/0x650 fs/namei.c:5369 do_unlinkat+0x2cf/0x570 fs/namei.c:5439 __do_sys_unlink fs/namei.c:5474 [inline] __se_sys_unlink fs/namei.c:5472 [inline] __x64_sys_unlink+0x47/0x50 fs/namei.c:5472 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2a8932ecf7 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdc24cada8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2a8932ecf7 RDX: 00007ffdc24cadd0 RSI: 00007ffdc24cae60 RDI: 00007ffdc24cae60 RBP: 00007ffdc24cae60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffdc24cbef0 R13: 00007f2a893b3d7d R14: 0000000000051213 R15: 00007ffdc24cbf30