INFO: task syz.2.617:7593 blocked for more than 143 seconds. Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.617 state:D stack:25920 pid:7593 tgid:7593 ppid:5246 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 rwsem_down_read_slowpath kernel/locking/rwsem.c:1084 [inline] __down_read_common kernel/locking/rwsem.c:1248 [inline] __down_read kernel/locking/rwsem.c:1261 [inline] down_read+0x705/0xa40 kernel/locking/rwsem.c:1526 filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] filemap_fault+0xd54/0x1950 mm/filemap.c:3350 __do_fault+0x135/0x460 mm/memory.c:4876 do_shared_fault mm/memory.c:5346 [inline] do_fault mm/memory.c:5420 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault+0x1105/0x6800 mm/memory.c:5751 __handle_mm_fault mm/memory.c:5894 [inline] handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6062 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f1ca4245163 RSP: 002b:00007f1ca465fb50 EFLAGS: 00010246 RAX: 0000000020000040 RBX: 0000000000000008 RCX: 0000000000000000 RDX: 0000000000010001 RSI: 0000000000000000 RDI: 000055556101d3c8 RBP: 00007f1ca465fc68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000002 R12: 000000000002aa4e R13: 00007f1ca465fc90 R14: 0000000000000032 R15: fffffffffffffffe INFO: task syz.0.663:7882 blocked for more than 143 seconds. Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.663 state:D stack:25920 pid:7882 tgid:7882 ppid:7512 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 rwsem_down_read_slowpath kernel/locking/rwsem.c:1084 [inline] __down_read_common kernel/locking/rwsem.c:1248 [inline] __down_read kernel/locking/rwsem.c:1261 [inline] down_read+0x705/0xa40 kernel/locking/rwsem.c:1526 filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 do_sync_mmap_readahead+0x499/0x970 filemap_fault+0x8c5/0x1950 mm/filemap.c:3343 __do_fault+0x135/0x460 mm/memory.c:4876 do_shared_fault mm/memory.c:5346 [inline] do_fault mm/memory.c:5420 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault+0x1105/0x6800 mm/memory.c:5751 __handle_mm_fault mm/memory.c:5894 [inline] handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6062 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7ff77c745a98 RSP: 002b:00007ff77ca5fb88 EFLAGS: 00010206 RAX: 0000000020000300 RBX: 0000000000000004 RCX: 4ed102642040107d RDX: 000000000000000e RSI: 107d668300000112 RDI: 0000000020000300 RBP: 00007ff77c937a80 R08: 00007ff77c600000 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000000 R12: 000000000002f119 R13: 00007ff77ca5fc90 R14: 0000000000000032 R15: fffffffffffffffe INFO: task syz.0.663:7884 blocked for more than 144 seconds. Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.663 state:D stack:23072 pid:7884 tgid:7882 ppid:7512 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x1895/0x4b30 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 rwsem_down_read_slowpath kernel/locking/rwsem.c:1084 [inline] __down_read_common kernel/locking/rwsem.c:1248 [inline] __down_read kernel/locking/rwsem.c:1261 [inline] down_read+0x705/0xa40 kernel/locking/rwsem.c:1526 filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 do_sync_mmap_readahead+0x499/0x970 filemap_fault+0x8c5/0x1950 mm/filemap.c:3343 __do_fault+0x135/0x460 mm/memory.c:4876 do_read_fault mm/memory.c:5282 [inline] do_fault mm/memory.c:5416 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault+0x2d1c/0x6800 mm/memory.c:5751 __handle_mm_fault mm/memory.c:5894 [inline] handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6062 faultin_page mm/gup.c:1187 [inline] __get_user_pages+0x1b16/0x48d0 mm/gup.c:1485 populate_vma_page_range+0x264/0x330 mm/gup.c:1923 __mm_populate+0x27a/0x460 mm/gup.c:2026 mm_populate include/linux/mm.h:3371 [inline] vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:593 ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:542 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff77c77dff9 RSP: 002b:00007ff77d533038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007ff77c935f80 RCX: 00007ff77c77dff9 RDX: 0000000001000002 RSI: 0000000000b36000 RDI: 0000000020000000 RBP: 00007ff77c7f0296 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff77c935f80 R15: 00007ff77ca5fa28 Showing all locks held in the system: 4 locks held by kworker/0:0H/10: 3 locks held by kworker/u8:0/11: #0: ffff88802df74148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88802df74148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90000107d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90000107d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcd1dc8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4736 1 lock held by khungtaskd/30: #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720 2 locks held by kworker/u8:2/35: 2 locks held by getty/4984: #0: ffff88802e1eb0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 3 locks held by kworker/u9:9/5241: #0: ffff88806c226948 ((wq_completion)hci8){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88806c226948 ((wq_completion)hci8){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90003c37d00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90003c37d00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffff888041d44d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x1ec/0x400 net/bluetooth/hci_sync.c:327 1 lock held by syz.0.305/6638: 2 locks held by syz.2.617/7593: #0: ffff888031bfd4a8 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:704 [inline] #0: ffff888031bfd4a8 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x34b/0x790 mm/memory.c:6228 #1: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #1: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_fault+0xd54/0x1950 mm/filemap.c:3350 1 lock held by syz.0.663/7882: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.0.663/7884: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.1.696/7979: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.0.834/8593: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.0.834/8599: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.0.834/8601: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.0.834/8602: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.0.834/8606: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.0.834/8613: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.0.834/8617: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.0.834/8622: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.0.834/8626: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.0.834/8629: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.2.899/8995: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.2.899/8998: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0x135/0x8a0 mm/readahead.c:226 1 lock held by syz.2.899/8999: #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:860 [inline] #0: ffff888148c84e40 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_fallocate+0x20e/0x490 block/fops.c:808 3 locks held by syz.1.1190/10230: #0: ffffffff8e7eade8 (system_transition_mutex){+.+.}-{3:3}, at: lock_system_sleep+0x60/0xa0 kernel/power/main.c:56 #1: ffffffff8e80b130 ((pm_chain_head).rwsem){++++}-{3:3}, at: blocking_notifier_call_chain+0x53/0x90 kernel/notifier.c:387 #2: ffff888041d44d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_resume_dev+0x136/0x230 net/bluetooth/hci_core.c:2853 1 lock held by syz.2.1198/10267: #0: ffffffff8e80b130 ((pm_chain_head).rwsem){++++}-{3:3}, at: __blocking_notifier_chain_register kernel/notifier.c:271 [inline] #0: ffffffff8e80b130 ((pm_chain_head).rwsem){++++}-{3:3}, at: blocking_notifier_chain_register+0x50/0xc0 kernel/notifier.c:290 1 lock held by syz.4.1199/10265: #0: ffffffff8e80b130 ((pm_chain_head).rwsem){++++}-{3:3}, at: __blocking_notifier_chain_register kernel/notifier.c:271 [inline] #0: ffffffff8e80b130 ((pm_chain_head).rwsem){++++}-{3:3}, at: blocking_notifier_chain_register+0x50/0xc0 kernel/notifier.c:290 2 locks held by syz.0.1201/10277: #0: ffffffff8fcd1dc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcd1dc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6643 #1: ffffffff8e93d378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #1: ffffffff8e93d378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 35 Comm: kworker/u8:2 Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: bat_events batadv_nc_worker RIP: 0010:check_preemption_disabled+0x14/0x120 lib/smp_processor_id.c:13 Code: 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 <48> 89 44 24 08 65 8b 1d 9c 32 3e 74 65 8b 05 91 32 3e 74 a9 ff ff RSP: 0018:ffffc90000a189a8 EFLAGS: 00000082 RAX: 371aaa66f128cd00 RBX: 0000000000000001 RCX: ffffffff819caa2c RDX: 0000000000000000 RSI: ffffffff8c60fb00 RDI: ffffffff8c60fac0 RBP: ffffc90000a18ab0 R08: ffffffff901cee2f R09: 1ffffffff2039dc5 R10: dffffc0000000000 R11: fffffbfff2039dc6 R12: dffffc0000000000 R13: 1ffff92000143144 R14: ffffc90000a18a40 R15: 0000000000000246 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31d08ff8 CR3: 0000000027f82000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:737 trace_irq_enable+0x3b/0x120 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x18/0x40 kernel/trace/trace_preemptirq.c:56 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x8f/0x140 kernel/locking/spinlock.c:194 __debug_check_no_obj_freed lib/debugobjects.c:998 [inline] debug_check_no_obj_freed+0x561/0x580 lib/debugobjects.c:1019 free_pages_prepare mm/page_alloc.c:1115 [inline] free_unref_page+0x41b/0xf20 mm/page_alloc.c:2638 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 do_softirq+0x11b/0x1e0 kernel/softirq.c:455 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382 spin_unlock_bh include/linux/spinlock.h:396 [inline] batadv_nc_purge_paths+0x312/0x3b0 net/batman-adv/network-coding.c:471 batadv_nc_worker+0x328/0x610 net/batman-adv/network-coding.c:720 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244