fail_dump lib/fault-inject.c:51 [inline]
 should_fail+0x87b/0xab0 lib/fault-inject.c:149
 should_failslab+0x279/0x2a0 mm/failslab.c:32
device syz_tun entered promiscuous mode
 slab_pre_alloc_hook mm/slab.h:422 [inline]
 slab_alloc_node mm/slub.c:2663 [inline]
 slab_alloc mm/slub.c:2745 [inline]
 kmem_cache_alloc+0x136/0xb90 mm/slub.c:2750
==================================================================
BUG: KMSAN: uninit-value in show_trace_log_lvl+0xda4/0x1030 arch/x86/kernel/dumpstack.c:203
device syz_tun left promiscuous mode
CPU: 0 PID: 7162 Comm: syz-executor7 Not tainted 4.16.0+ #84
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x14a/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 show_trace_log_lvl+0xda4/0x1030 arch/x86/kernel/dumpstack.c:203
netlink: 12 bytes leftover after parsing attributes in process `syz-executor1'.
 show_stack+0xfc/0x150 arch/x86/kernel/dumpstack.c:236
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail+0x87b/0xab0 lib/fault-inject.c:149
 should_failslab+0x279/0x2a0 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:422 [inline]
 slab_alloc_node mm/slub.c:2663 [inline]
 slab_alloc mm/slub.c:2745 [inline]
 kmem_cache_alloc+0x136/0xb90 mm/slub.c:2750
 kmem_cache_zalloc include/linux/slab.h:691 [inline]
 jbd2_alloc_handle include/linux/jbd2.h:1421 [inline]
 new_handle fs/jbd2/transaction.c:400 [inline]
 jbd2__journal_start+0x274/0xc90 fs/jbd2/transaction.c:425
 __ext4_journal_start_sb+0x493/0x6f0 fs/ext4/ext4_jbd2.c:81
 __ext4_journal_start fs/ext4/ext4_jbd2.h:311 [inline]
 ext4_punch_hole+0xf94/0x1c70 fs/ext4/inode.c:4278
 ext4_fallocate+0x443/0x3790 fs/ext4/extents.c:4924
 vfs_fallocate+0x9dc/0xde0 fs/open.c:319
 SYSC_fallocate+0x119/0x1d0 fs/open.c:342
 SyS_fallocate+0x64/0x90 fs/open.c:336
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455329
RSP: 002b:00007f1bff465c68 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f1bff4666d4 RCX: 0000000000455329
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000ffff R11: 0000000000000246 R12: 0000000000000015
R13: 000000000000007d R14: 00000000006f3c58 R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:521
 update_stack_state+0x9e2/0xa40 arch/x86/kernel/unwind_frame.c:261
 unwind_next_frame+0x618/0xe50 arch/x86/kernel/unwind_frame.c:329
 show_trace_log_lvl+0xb49/0x1030 arch/x86/kernel/dumpstack.c:212
 show_stack+0xfc/0x150 arch/x86/kernel/dumpstack.c:236
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail+0x87b/0xab0 lib/fault-inject.c:149
 should_failslab+0x279/0x2a0 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:422 [inline]
 slab_alloc_node mm/slub.c:2663 [inline]
 slab_alloc mm/slub.c:2745 [inline]
 kmem_cache_alloc+0x136/0xb90 mm/slub.c:2750
 kmem_cache_zalloc include/linux/slab.h:691 [inline]
 jbd2_alloc_handle include/linux/jbd2.h:1421 [inline]
 new_handle fs/jbd2/transaction.c:400 [inline]
 jbd2__journal_start+0x274/0xc90 fs/jbd2/transaction.c:425
 __ext4_journal_start_sb+0x493/0x6f0 fs/ext4/ext4_jbd2.c:81
 __ext4_journal_start fs/ext4/ext4_jbd2.h:311 [inline]
 ext4_punch_hole+0xf94/0x1c70 fs/ext4/inode.c:4278
 ext4_fallocate+0x443/0x3790 fs/ext4/extents.c:4924
 vfs_fallocate+0x9dc/0xde0 fs/open.c:319
 SYSC_fallocate+0x119/0x1d0 fs/open.c:342
 SyS_fallocate+0x64/0x90 fs/open.c:336
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Local variable description: ----locked_pvec@truncate_inode_pages_range
Variable was created at:
 truncate_inode_pages_range+0x12d/0x2810 mm/truncate.c:295
 truncate_pagecache_range+0x1a2/0x1c0 mm/truncate.c:915
==================================================================