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+0x185/0x1d0 lib/dump_stack.c:53 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x87b/0xab0 lib/fault-inject.c:149 ================================================================== BUG: KMSAN: uninit-value in core_kernel_text kernel/extable.c:77 [inline] BUG: KMSAN: uninit-value in kernel_text_address+0x248/0x3a0 kernel/extable.c:127 CPU: 1 PID: 3583 Comm: syzkaller289757 Not tainted 4.16.0+ #83 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 core_kernel_text kernel/extable.c:77 [inline] kernel_text_address+0x248/0x3a0 kernel/extable.c:127 __kernel_text_address+0x34/0xe0 kernel/extable.c:107 show_trace_log_lvl+0x954/0x1030 arch/x86/kernel/dumpstack.c:175 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_alloc_file_blocks+0x5e4/0x1370 fs/ext4/extents.c:4682 ext4_fallocate+0x132b/0x3790 fs/ext4/extents.c:4970 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: 0033:0x445999 RSP: 002b:00007f797470dd78 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00000000006dbc44 RCX: 0000000000445999 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000006dbc40 R08: 0000000000000001 R09: 0000000000000031 R10: 0000000001000001 R11: 0000000000000246 R12: 00007f797470dd80 R13: ffffffffffffffff R14: 0000000000000005 R15: 0030656c69662f2e Local variable description: ----pvec@mpage_release_unused_pages Variable was created at: mpage_release_unused_pages+0x75/0x8f0 fs/ext4/inode.c:1712 ext4_writepages+0x5691/0x6840 fs/ext4/inode.c:2905 ==================================================================