BUG: kernel NULL pointer dereference, address: 00000000000000f0 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP CPU: 0 PID: 8576 Comm: systemd-udevd Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:bdev_read_page+0xa/0xa0 fs/block_dev.c:700 Code: 48 8b 38 48 81 ef b8 01 00 00 e8 b1 fe ff ff 31 c0 c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 41 55 41 54 55 53 48 83 ec 08 <48> 8b 87 f0 00 00 00 4c 8b a8 20 06 00 00 49 83 7d 10 00 74 72 48 RSP: 0018:ffffc90003027ae0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000014 RDX: ffffea0004395900 RSI: a000439590000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 000000000000001d R13: 0000000000000000 R14: a000439590000000 R15: ffffc90003027bd0 FS: 00007f74af0cf8c0(0000) GS:ffff88812c000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000000f0 CR3: 000000010e5f7000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_mpage_readpage+0x52a/0x870 fs/mpage.c:302 mpage_readahead+0xf3/0x220 fs/mpage.c:391 read_pages+0x8a/0x3f0 mm/readahead.c:130 page_cache_readahead_unbounded+0x159/0x280 mm/readahead.c:244 generic_file_buffered_read+0x491/0x6d0 mm/filemap.c:2033 call_read_iter include/linux/fs.h:1902 [inline] new_sync_read+0x10c/0x190 fs/read_write.c:415 vfs_read+0x17a/0x1b0 fs/read_write.c:481 ksys_read+0x5a/0xd0 fs/read_write.c:607 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f74ae216210 Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 RSP: 002b:00007ffdf7d93ec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000056468e838dd0 RCX: 00007f74ae216210 RDX: 0000000000000400 RSI: 000056468e838df8 RDI: 000000000000000f RBP: 000056468e83add0 R08: 00007f74ae200f58 R09: 0000000000000430 R10: 000056468e838de8 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000400 R14: 000056468e83ae20 R15: 0000000000000400 Modules linked in: CR2: 00000000000000f0 ---[ end trace cdc72e43442c520b ]--- RIP: 0010:bdev_read_page+0xa/0xa0 fs/block_dev.c:700 Code: 48 8b 38 48 81 ef b8 01 00 00 e8 b1 fe ff ff 31 c0 c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 41 55 41 54 55 53 48 83 ec 08 <48> 8b 87 f0 00 00 00 4c 8b a8 20 06 00 00 49 83 7d 10 00 74 72 48 RSP: 0018:ffffc90003027ae0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000014 RDX: ffffea0004395900 RSI: a000439590000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 000000000000001d R13: 0000000000000000 R14: a000439590000000 R15: ffffc90003027bd0 FS: 00007f74af0cf8c0(0000) GS:ffff88812c000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe3add5da8 CR3: 000000010e5f7000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400