===================================================== BUG: KMSAN: uninit-value in arch_atomic_fetch_add arch/x86/include/asm/atomic.h:184 [inline] BUG: KMSAN: uninit-value in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:112 [inline] BUG: KMSAN: uninit-value in __refcount_add include/linux/refcount.h:193 [inline] BUG: KMSAN: uninit-value in __refcount_inc include/linux/refcount.h:250 [inline] BUG: KMSAN: uninit-value in refcount_inc include/linux/refcount.h:267 [inline] BUG: KMSAN: uninit-value in get_task_struct include/linux/sched/task.h:104 [inline] BUG: KMSAN: uninit-value in rwsem_mark_wake+0xb25/0xd60 kernel/locking/rwsem.c:514 arch_atomic_fetch_add arch/x86/include/asm/atomic.h:184 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:112 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] get_task_struct include/linux/sched/task.h:104 [inline] rwsem_mark_wake+0xb25/0xd60 kernel/locking/rwsem.c:514 rwsem_wake kernel/locking/rwsem.c:1177 [inline] __up_write kernel/locking/rwsem.c:1323 [inline] up_write+0x1b0/0x220 kernel/locking/rwsem.c:1570 anon_vma_unlock_write include/linux/rmap.h:121 [inline] split_huge_page_to_list+0x2165/0x2430 mm/huge_memory.c:2725 shrink_page_list+0x3538/0x8680 mm/vmscan.c:1587 shrink_inactive_list+0xb3d/0x17b0 mm/vmscan.c:2281 shrink_list mm/vmscan.c:2508 [inline] shrink_lruvec+0x7bc/0x17f0 mm/vmscan.c:2827 shrink_node_memcgs+0x5d3/0xc70 mm/vmscan.c:3016 shrink_node+0x176b/0x3590 mm/vmscan.c:3139 kswapd_shrink_node mm/vmscan.c:3878 [inline] balance_pgdat+0x15a0/0x2790 mm/vmscan.c:4069 kswapd+0x515/0x8b0 mm/vmscan.c:4328 kthread+0x66b/0x780 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Local variable ----pmde.sroa.0@page_vma_mapped_walk created at: page_vma_mapped_walk+0xcf/0x35a0 mm/page_vma_mapped.c:164 page_referenced_one+0x771/0xda0 mm/rmap.c:783 ===================================================== Kernel panic - not syncing: panic_on_kmsan set ... CPU: 0 PID: 178 Comm: kswapd0 Tainted: G B 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106 dump_stack+0x25/0x28 lib/dump_stack.c:113 panic+0x44f/0xdeb kernel/panic.c:232 kmsan_report+0x2ee/0x300 mm/kmsan/report.c:186 __msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:208 arch_atomic_fetch_add arch/x86/include/asm/atomic.h:184 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:112 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] get_task_struct include/linux/sched/task.h:104 [inline] rwsem_mark_wake+0xb25/0xd60 kernel/locking/rwsem.c:514 rwsem_wake kernel/locking/rwsem.c:1177 [inline] __up_write kernel/locking/rwsem.c:1323 [inline] up_write+0x1b0/0x220 kernel/locking/rwsem.c:1570 anon_vma_unlock_write include/linux/rmap.h:121 [inline] split_huge_page_to_list+0x2165/0x2430 mm/huge_memory.c:2725 shrink_page_list+0x3538/0x8680 mm/vmscan.c:1587 shrink_inactive_list+0xb3d/0x17b0 mm/vmscan.c:2281 shrink_list mm/vmscan.c:2508 [inline] shrink_lruvec+0x7bc/0x17f0 mm/vmscan.c:2827 shrink_node_memcgs+0x5d3/0xc70 mm/vmscan.c:3016 shrink_node+0x176b/0x3590 mm/vmscan.c:3139 kswapd_shrink_node mm/vmscan.c:3878 [inline] balance_pgdat+0x15a0/0x2790 mm/vmscan.c:4069 kswapd+0x515/0x8b0 mm/vmscan.c:4328 kthread+0x66b/0x780 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Kernel Offset: disabled Rebooting in 86400 seconds..