1965969 pages RAM [ 7893] 0 7893 17584 8738 131072 0 0 syz-executor3 0 pages HighMem/MovableOnly 102442 pages reserved [ 7896] 0 7896 17584 8738 131072 0 0 syz-executor3 BUG: unable to handle kernel NULL pointer dereference at 00000000000008f4 [ 7910] 0 7910 17617 8740 131072 0 0 syz-executor3 PGD 80000001a7c8a067 P4D 80000001a7c8a067 PUD 1a9ca8067 PMD 0 Oops: 0002 [#1] SMP PTI CPU: 1 PID: 24 Comm: kworker/1:1 Not tainted 4.19.0-rc1+ #41 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: (null) [ 7914] 0 7914 17617 8740 131072 0 0 syz-executor3 (events) RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65 Code: c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 RSP: 0000:ffff8801d52afa18 EFLAGS: 00010046 RAX: 0000000000000000 RBX: fffffffffffffff4 RCX: 0000000000000fb0 RDX: 0000000000000fb0 RSI: 0000000000000000 RDI: 00000000000008f4 [ 7933] 0 7933 17617 8740 131072 0 0 syz-executor3 RBP: ffff8801d52afa28 R08: 0000000000000000 R09: 00000000000008f4 R10: 0000000000000000 R11: ffffffff81355350 R12: 000000008fe00007 R13: 0000000000000000 R14: 0000000000000282 R15: fffffffffffffff4 FS: 0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000000b0 CR3: 00000001a3744000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 7936] 0 7936 17617 8740 131072 0 0 syz-executor3 Call Trace: kmsan_thread_create+0x4b/0x90 mm/kmsan/kmsan_hooks.c:30 __kthread_create_on_node+0x71b/0x810 kernel/kthread.c:345 [ 7961] 0 7961 17584 8737 131072 0 0 syz-executor6 kthread_create_on_node+0x23f/0x270 kernel/kthread.c:381 create_worker+0x4ee/0xfb0 kernel/workqueue.c:1813 [ 7966] 0 7966 17617 8740 131072 0 0 syz-executor3 maybe_create_worker kernel/workqueue.c:1972 [inline] manage_workers kernel/workqueue.c:2024 [inline] worker_thread+0x8d9/0x2590 kernel/workqueue.c:2268 kthread+0x465/0x4a0 kernel/kthread.c:247 [ 7969] 0 7969 17617 8740 131072 0 0 syz-executor3 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:416 Modules linked in: Dumping ftrace buffer: [ 8049] 0 8049 17650 8742 131072 0 0 syz-executor3 (ftrace buffer empty) CR2: 00000000000008f4 ---[ end trace eb82e98d4a02f3c1 ]--- RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65 Code: c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 RSP: 0000:ffff8801d52afa18 EFLAGS: 00010046 [ 8075] 0 8075 17617 8742 131072 0 0 syz-executor1 RAX: 0000000000000000 RBX: fffffffffffffff4 RCX: 0000000000000fb0 RDX: 0000000000000fb0 RSI: 0000000000000000 RDI: 00000000000008f4 RBP: ffff8801d52afa28 R08: 0000000000000000 R09: 00000000000008f4 R10: 0000000000000000 R11: ffffffff81355350 R12: 000000008fe00007 R13: 0000000000000000 R14: 0000000000000282 R15: fffffffffffffff4 FS: 0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000000b0 CR3: 00000001a3744000 CR4: 00000000001406e0 [ 8077] 0 8077 17617 8742 131072 0 0 syz-executor1 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400