================================================================== BUG: KMSAN: uninit-value in __zone_watermark_ok mm/page_alloc.c:3196 [inline] BUG: KMSAN: uninit-value in zone_watermark_fast mm/page_alloc.c:3233 [inline] BUG: KMSAN: uninit-value in get_page_from_freelist+0xf9f/0xb5e0 mm/page_alloc.c:3317 CPU: 0 PID: 10570 Comm: syz-executor7 Not tainted 4.17.0-rc5+ #102 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:113 kmsan_report+0x149/0x260 mm/kmsan/kmsan.c:1084 __msan_warning_32+0x6e/0xc0 mm/kmsan/kmsan_instr.c:686 __zone_watermark_ok mm/page_alloc.c:3196 [inline] zone_watermark_fast mm/page_alloc.c:3233 [inline] get_page_from_freelist+0xf9f/0xb5e0 mm/page_alloc.c:3317 __alloc_pages_nodemask+0x7be/0x5dc0 mm/page_alloc.c:4371 __alloc_pages include/linux/gfp.h:458 [inline] __alloc_pages_node include/linux/gfp.h:471 [inline] alloc_pages_node include/linux/gfp.h:485 [inline] kmalloc_large_node mm/slub.c:3831 [inline] __kmalloc_node+0x46b/0x11f0 mm/slub.c:3845 kmalloc_node include/linux/slab.h:554 [inline] kvmalloc_node+0x197/0x2f0 mm/util.c:421 kvmalloc include/linux/mm.h:550 [inline] kvzalloc include/linux/mm.h:558 [inline] alloc_netdev_mqs+0x1bd/0x1740 net/core/dev.c:8369 tun_set_iff drivers/net/tun.c:2602 [inline] __tun_chr_ioctl+0x4689/0x6870 drivers/net/tun.c:2889 tun_chr_ioctl+0x9c/0xb0 drivers/net/tun.c:3161 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0xaf8/0x2410 fs/ioctl.c:686 ksys_ioctl fs/ioctl.c:701 [inline] __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x280/0x320 fs/ioctl.c:706 do_syscall_64+0x152/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x455a09 RSP: 002b:00007fbf4c30fc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fbf4c3106d4 RCX: 0000000000455a09 RDX: 0000000020000100 RSI: 00000000400454ca RDI: 0000000000000015 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000036f R14: 00000000006f9308 R15: 0000000000000000 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline] kmsan_save_stack mm/kmsan/kmsan.c:294 [inline] kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:685 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:529 __write_once_size include/linux/compiler.h:224 [inline] __list_add include/linux/list.h:66 [inline] list_add include/linux/list.h:79 [inline] __free_one_page+0x16cb/0x1800 mm/page_alloc.c:876 free_one_page mm/page_alloc.c:1176 [inline] __free_pages_ok+0x87f/0x16c0 mm/page_alloc.c:1260 __free_pages+0x109/0x240 mm/page_alloc.c:4442 kfree+0x8f1/0x29e0 mm/slub.c:3972 kvfree+0xe4/0x100 mm/util.c:440 netdev_freemem+0x6b/0x90 net/core/dev.c:8323 netdev_release+0xaa/0xf0 net/core/net-sysfs.c:1502 device_release+0x207/0x370 drivers/base/core.c:823 kobject_cleanup lib/kobject.c:643 [inline] kobject_release lib/kobject.c:672 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put+0x3da/0x4c0 lib/kobject.c:689 netdev_run_todo+0x1323/0x1530 net/core/dev.c:8228 rtnl_unlock+0x13/0x20 net/core/rtnetlink.c:114 tun_detach drivers/net/tun.c:755 [inline] tun_chr_close+0x18c/0x1c0 drivers/net/tun.c:3251 __fput+0x457/0xa10 fs/file_table.c:209 ____fput+0x37/0x40 fs/file_table.c:243 task_work_run+0x243/0x2c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x10e1/0x38d0 kernel/exit.c:867 do_group_exit+0x1a0/0x360 kernel/exit.c:970 get_signal+0xfcb/0x1f40 kernel/signal.c:2482 do_signal+0xb8/0x1cf0 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline] prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196 syscall_return_slowpath+0xe9/0x700 arch/x86/entry/common.c:265 do_syscall_64+0x1af/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline] kmsan_save_stack mm/kmsan/kmsan.c:294 [inline] kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:685 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:529 search_extable+0xfb/0x110 lib/extable.c:123 search_exception_tables+0x8b/0x120 kernel/extable.c:60 fixup_exception+0x84/0x190 arch/x86/mm/extable.c:192 math_error+0x448/0x600 arch/x86/kernel/traps.c:845 do_coprocessor_error+0x29/0x30 arch/x86/kernel/traps.c:876 coprocessor_error+0x14/0x20 arch/x86/entry/entry_64.S:999 fpu__drop+0x27f/0x4f0 arch/x86/kernel/fpu/core.c:345 exit_thread+0x168/0x1d0 arch/x86/kernel/process.c:128 do_exit+0x10f0/0x38d0 kernel/exit.c:868 do_group_exit+0x1a0/0x360 kernel/exit.c:970 get_signal+0xfcb/0x1f40 kernel/signal.c:2482 do_signal+0xb8/0x1cf0 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline] prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196 syscall_return_slowpath+0xe9/0x700 arch/x86/entry/common.c:265 do_syscall_64+0x1af/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Local variable description: ----flags.i.i.i.i@enter_lazy_tlb Variable was created at: enter_lazy_tlb+0x30/0x120 arch/x86/mm/tlb.c:352 context_switch kernel/sched/core.c:2849 [inline] __schedule+0x5e0/0x730 kernel/sched/core.c:3507 ==================================================================