INFO: task syz.3.585:11254 blocked for more than 143 seconds. Not tainted 6.15.0-rc3-syzkaller-00001-g9d7a0577c9db #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.585 state:D stack:13472 pid:11254 tgid:11253 ppid:9844 task_flags:0x440140 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0x163/0x360 kernel/sched/core.c:6860 __bch2_two_state_lock+0x238/0x3f0 fs/bcachefs/two_state_shared_lock.c:7 bch2_two_state_lock fs/bcachefs/two_state_shared_lock.h:55 [inline] bch2_readahead+0x9b9/0x12d0 fs/bcachefs/fs-io-buffered.c:296 read_pages+0x193/0x590 mm/readahead.c:160 page_cache_ra_order+0xa37/0xca0 mm/readahead.c:515 filemap_get_pages+0x59f/0x1fc0 mm/filemap.c:2591 filemap_splice_read+0x690/0xef0 mm/filemap.c:2981 do_splice_read fs/splice.c:979 [inline] splice_direct_to_actor+0x4af/0xc90 fs/splice.c:1083 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0x281/0x3d0 fs/splice.c:1227 vfs_copy_file_range+0xbb9/0x1480 fs/read_write.c:1625 __do_sys_copy_file_range fs/read_write.c:1675 [inline] __se_sys_copy_file_range+0x3fe/0x600 fs/read_write.c:1642 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0cf078e169 RSP: 002b:00007f0cf1684038 EFLAGS: 00000246 ORIG_RAX: 0000000000000146 RAX: ffffffffffffffda RBX: 00007f0cf09b5fa0 RCX: 00007f0cf078e169 RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000009 RBP: 00007f0cf0810a68 R08: 0000000000400000 R09: 0000000000000000 R10: 00002000000000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0cf09b5fa0 R15: 00007ffd6f5d7b78 INFO: task syz.3.585:11296 blocked for more than 144 seconds. Not tainted 6.15.0-rc3-syzkaller-00001-g9d7a0577c9db #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.585 state:D stack:24560 pid:11296 tgid:11253 ppid:9844 task_flags:0x400140 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0x163/0x360 kernel/sched/core.c:6860 io_schedule+0x8d/0x110 kernel/sched/core.c:7742 folio_wait_bit_common+0x83f/0xf00 mm/filemap.c:1317 __folio_lock mm/filemap.c:1664 [inline] folio_lock include/linux/pagemap.h:1137 [inline] __filemap_get_folio+0x147/0xb40 mm/filemap.c:1917 filemap_lock_folio include/linux/pagemap.h:775 [inline] __bch2_truncate_folio+0x15a/0x2640 fs/bcachefs/fs-io.c:274 bch2_truncate_folio fs/bcachefs/fs-io.c:376 [inline] bchfs_truncate+0x6a7/0xc60 fs/bcachefs/fs-io.c:466 notify_change+0xbca/0xe90 fs/attr.c:552 do_truncate+0x222/0x310 fs/open.c:65 handle_truncate fs/namei.c:3501 [inline] do_open fs/namei.c:3884 [inline] path_openat+0x2e4f/0x35d0 fs/namei.c:4039 do_filp_open+0x284/0x4e0 fs/namei.c:4066 do_sys_openat2+0x12b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_open fs/open.c:1452 [inline] __se_sys_open fs/open.c:1448 [inline] __x64_sys_open+0x226/0x280 fs/open.c:1448 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0cf078e169 RSP: 002b:00007f0cf1663038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f0cf09b6080 RCX: 00007f0cf078e169 RDX: 0000000000000000 RSI: 000000000014927e RDI: 0000200000000180 RBP: 00007f0cf0810a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0cf09b6080 R15: 00007ffd6f5d7b78 Showing all locks held in the system: 2 locks held by kworker/u8:1/13: #0: ffff888144292948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff888144292948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319 #1: ffffc90000127c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90000127c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319 1 lock held by khungtaskd/31: #0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8ed3df20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6764 3 locks held by kworker/1:1/52: #0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319 #1: ffffc90000bd7c60 (key_gc_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90000bd7c60 (key_gc_work){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319 #2: ffffffff8ed43438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline] #2: ffffffff8ed43438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x454/0x830 kernel/rcu/tree_exp.h:998 6 locks held by kworker/u8:4/64: #0: ffff88801bef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff88801bef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319 #1: ffffc9000155fc60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc9000155fc60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319 #2: ffffffff900de7d0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x17c/0xd60 net/core/net_namespace.c:608 #3: ffff88803a50f0e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline] #3: ffff88803a50f0e8 (&dev->mutex){....}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:108 [inline] #3: ffff88803a50f0e8 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x13d/0x450 net/devlink/core.c:506 #4: ffff888022ffb250 (&devlink->lock_key#19){+.+.}-{4:4}, at: devl_lock net/devlink/core.c:276 [inline] #4: ffff888022ffb250 (&devlink->lock_key#19){+.+.}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:109 [inline] #4: ffff888022ffb250 (&devlink->lock_key#19){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x14f/0x450 net/devlink/core.c:506 #5: ffffffff900eb308 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #5: ffffffff900eb308 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_dev_lock+0x271/0x320 net/core/dev.c:2089 3 locks held by udevd/5200: 2 locks held by dhcpcd/5493: #0: ffffffff900cfd88 (vlan_ioctl_mutex){+.+.}-{4:4}, at: sock_ioctl+0x6d1/0x900 net/socket.c:1273 #1: ffffffff900eb308 (rtnl_mutex){+.+.}-{4:4}, at: vlan_ioctl_handler+0x118/0xa20 net/8021q/vlan.c:554 2 locks held by getty/5580: #0: ffff88814d3850a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900036be2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x5bb/0x1700 drivers/tty/n_tty.c:2222 3 locks held by udevd/5844: 1 lock held by syz.3.585/11254: #0: ffff888059c499b0 (mapping.invalidate_lock#13){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] #0: ffff888059c499b0 (mapping.invalidate_lock#13){.+.+}-{4:4}, at: page_cache_ra_order+0x45e/0xca0 mm/readahead.c:491 2 locks held by syz.3.585/11296: #0: ffff88802a744420 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:556 #1: ffff888059c49810 (&sb->s_type->i_mutex_key#22){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff888059c49810 (&sb->s_type->i_mutex_key#22){++++}-{4:4}, at: do_truncate+0x20e/0x310 fs/open.c:63 8 locks held by syz-executor/13155: #0: ffff88807f0fa420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline] #0: ffff88807f0fa420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x23f/0xd10 fs/read_write.c:680 #1: ffff88807b124488 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1e2/0x510 fs/kernfs/file.c:325 #2: ffff888143bfb4b8 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x206/0x510 fs/kernfs/file.c:326 #3: ffffffff8f984ca8 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xfe/0x490 drivers/net/netdevsim/bus.c:216 #4: ffff88814d0bc0e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline] #4: ffff88814d0bc0e8 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ffff88814d0bc0e8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1293 #5: ffff88814d0be250 (&devlink->lock_key#9){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1675 #6: ffffffff900eb308 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0x10d/0x690 drivers/net/netdevsim/netdev.c:1059 #7: ffffffff8ed43438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline] #7: ffffffff8ed43438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x454/0x830 kernel/rcu/tree_exp.h:998 5 locks held by syz.6.811/13494: 2 locks held by syz-executor/13497: #0: ffffffff900de7d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x328/0x570 net/core/net_namespace.c:514 #1: ffffffff900eb308 (rtnl_mutex){+.+.}-{4:4}, at: register_nexthop_notifier+0x87/0x270 net/ipv4/nexthop.c:3918 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc3-syzkaller-00001-g9d7a0577c9db #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x4ab/0x4e0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline] watchdog+0x1058/0x10a0 kernel/hung_task.c:437 kthread+0x7b7/0x940 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 13517 Comm: udevadm Not tainted 6.15.0-rc3-syzkaller-00001-g9d7a0577c9db #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:check_preemption_disabled+0x2/0x120 lib/smp_processor_id.c:13 Code: e2 a0 8c 48 c7 c6 60 e2 a0 8c eb 1c 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 <41> 56 41 55 41 54 53 48 83 ec 10 4c 8d 25 3c 41 3d 07 65 49 8b 04 RSP: 0018:ffffc9000abef3b0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000001 RCX: dffffc0000000000 RDX: 1ffff9200157de7c RSI: ffffffff8ca0e260 RDI: ffffffff8ca0e220 RBP: ffffc9000abef480 R08: ffff888027965a07 R09: 1ffff11004f2cb40 R10: dffffc0000000000 R11: ffffed1004f2cb41 R12: 0000000000000003 R13: ffff888027965a00 R14: 0000000000000008 R15: 1ffff11004f2cb40 FS: 00007f69deaabc80(0000) GS:ffff8881250cf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe8e54c000 CR3: 000000004223c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __resched_curr+0x1ed/0x450 kernel/sched/core.c:1112 wakeup_preempt+0xe8/0x2c0 kernel/sched/core.c:2196 ttwu_do_activate+0x233/0x8e0 kernel/sched/core.c:3733 ttwu_queue kernel/sched/core.c:4000 [inline] try_to_wake_up+0x93a/0x15d0 kernel/sched/core.c:4328 autoremove_wake_function+0x16/0x110 kernel/sched/wait.c:384 __wake_up_common kernel/sched/wait.c:89 [inline] __wake_up_common_lock+0x130/0x1e0 kernel/sched/wait.c:106 audit_log_end+0x1c8/0x250 kernel/audit.c:2441 common_lsm_audit+0x249/0x2e0 security/lsm_audit.c:475 smack_log+0x4de/0x630 security/smack/smack_access.c:391 smk_tskacc+0x300/0x370 security/smack/smack_access.c:255 smack_inode_permission+0x2dd/0x380 security/smack/smack_lsm.c:1218 security_inode_permission+0x101/0x320 security/security.c:2324 may_lookup fs/namei.c:1845 [inline] link_path_walk+0x218/0xeb0 fs/namei.c:2451 path_lookupat+0xa3/0x440 fs/namei.c:2659 filename_lookup+0x290/0x670 fs/namei.c:2689 do_readlinkat+0xee/0x380 fs/stat.c:568 __do_sys_readlink fs/stat.c:605 [inline] __se_sys_readlink fs/stat.c:602 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:602 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f69deb82d47 Code: 73 01 c3 48 8b 0d e1 90 0d 00 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 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b1 90 0d 00 f7 d8 64 89 01 48 RSP: 002b:00007ffe8e54f798 EFLAGS: 00000246 ORIG_RAX: 0000000000000059 RAX: ffffffffffffffda RBX: 00007ffe8e54f7a8 RCX: 00007f69deb82d47 RDX: 0000000000000400 RSI: 00007ffe8e54f7a8 RDI: 00007ffe8e54fc88 RBP: 0000000000000400 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000010 R11: 0000000000000246 R12: 00007ffe8e54fc88 R13: 00007ffe8e54fbf8 R14: 0000555a2d2c2910 R15: 0000555a2d2c2a60