blkdev_ioctl+0x513/0x6f0 block/ioctl.c:779 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ kernel BUG at mm/filemap.c:859! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 3 UID: 0 PID: 8004 Comm: syz.0.667 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__filemap_add_folio+0xf81/0x1350 mm/filemap.c:859 Code: 15 a5 c3 ff 48 8d 3d ce 82 9a 0e 67 48 0f b9 3a e9 07 fd ff ff e8 ff a4 c3 ff 48 c7 c6 60 56 bd 8b 4c 89 ef e8 10 bc 12 00 90 <0f> 0b 4c 8b 6c 24 60 e8 e3 a4 c3 ff 48 c7 84 24 a0 00 00 00 03 00 RSP: 0018:ffffc900046c73e0 EFLAGS: 00010246 RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc90006f01000 RDX: 0000000000080000 RSI: ffffffff82589288 RDI: ffff888012aa84c4 RBP: 0000000000112cc0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000002 R13: ffffea0000d73980 R14: 0000000000000000 R15: 1ffff920008d8ea7 FS: 00007f4d4a3b36c0(0000) GS:ffff8880d65db000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005621374b4300 CR3: 00000000354de000 CR4: 0000000000352ef0 Call Trace: filemap_add_folio+0x1d8/0x690 mm/filemap.c:967 ra_alloc_folio mm/readahead.c:456 [inline] page_cache_ra_order+0x614/0xf10 mm/readahead.c:515 do_sync_mmap_readahead mm/filemap.c:3406 [inline] filemap_fault+0x1900/0x2e90 mm/filemap.c:3555 __do_fault+0x10b/0x440 mm/memory.c:5458 do_shared_fault mm/memory.c:5957 [inline] do_fault+0x2db/0x1750 mm/memory.c:6031 do_pte_missing mm/memory.c:4550 [inline] handle_pte_fault mm/memory.c:6411 [inline] __handle_mm_fault+0x187d/0x2a00 mm/memory.c:6549 handle_mm_fault+0x36d/0xa20 mm/memory.c:6718 do_user_addr_fault+0x74c/0x12f0 arch/x86/mm/fault.c:1385 handle_page_fault arch/x86/mm/fault.c:1474 [inline] exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] RIP: 0010:raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] RIP: 0010:copy_to_user_iter lib/iov_iter.c:25 [inline] RIP: 0010:iterate_ubuf include/linux/iov_iter.h:30 [inline] RIP: 0010:iterate_and_advance2 include/linux/iov_iter.h:302 [inline] RIP: 0010:iterate_and_advance include/linux/iov_iter.h:330 [inline] RIP: 0010:_copy_to_iter+0x38c/0x1720 lib/iov_iter.c:197 Code: 00 00 00 00 e9 4d ff ff ff e8 90 f6 11 fd 4c 8b 74 24 18 44 89 fe 4c 89 f7 e8 10 b5 7f fd 0f 01 cb 4c 89 f9 48 89 df 4c 89 f6 a4 0f 1f 00 48 89 cb 0f 01 ca 4c 89 f8 48 29 c8 48 89 44 24 08 RSP: 0018:ffffc900046c7bb8 EFLAGS: 00050246 RAX: 0000000000000001 RBX: 0000200000617000 RCX: 0000000000000040 RDX: 0000000000000001 RSI: ffffc900046c7d78 RDI: 0000200000617000 RBP: ffffc900046c7e68 R08: 0000000000000000 R09: fffff520008d8fb6 R10: ffffc900046c7db7 R11: 0000000000000000 R12: 0000200000617040 R13: 00007ffffffff000 R14: ffffc900046c7d78 R15: 0000000000000040 copy_to_iter include/linux/uio.h:220 [inline] get_random_bytes_user+0x17b/0x3d0 drivers/char/random.c:462 __do_sys_getrandom drivers/char/random.c:1406 [inline] __se_sys_getrandom drivers/char/random.c:1380 [inline] __x64_sys_getrandom+0x183/0x290 drivers/char/random.c:1380 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4d4959c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4d4a3b3028 EFLAGS: 00000246 ORIG_RAX: 000000000000013e RAX: ffffffffffffffda RBX: 00007f4d49815fa0 RCX: 00007f4d4959c819 RDX: 0000000000000000 RSI: 00000000ffffff9a RDI: 0000200000000240 RBP: 00007f4d49632c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4d49816038 R14: 00007f4d49815fa0 R15: 00007fff0d8aa2e8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__filemap_add_folio+0xf81/0x1350 mm/filemap.c:859 Code: 15 a5 c3 ff 48 8d 3d ce 82 9a 0e 67 48 0f b9 3a e9 07 fd ff ff e8 ff a4 c3 ff 48 c7 c6 60 56 bd 8b 4c 89 ef e8 10 bc 12 00 90 <0f> 0b 4c 8b 6c 24 60 e8 e3 a4 c3 ff 48 c7 84 24 a0 00 00 00 03 00 RSP: 0018:ffffc900046c73e0 EFLAGS: 00010246 RAX: 0000000000080000 RBX: 0000000000000000 RCX: ffffc90006f01000 RDX: 0000000000080000 RSI: ffffffff82589288 RDI: ffff888012aa84c4 RBP: 0000000000112cc0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000002 R13: ffffea0000d73980 R14: 0000000000000000 R15: 1ffff920008d8ea7 FS: 00007f4d4a3b36c0(0000) GS:ffff8880d65db000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005621374b4300 CR3: 00000000354de000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 00 add %al,(%rax) 4: e9 4d ff ff ff jmp 0xffffff56 9: e8 90 f6 11 fd call 0xfd11f69e e: 4c 8b 74 24 18 mov 0x18(%rsp),%r14 13: 44 89 fe mov %r15d,%esi 16: 4c 89 f7 mov %r14,%rdi 19: e8 10 b5 7f fd call 0xfd7fb52e 1e: 0f 01 cb stac 21: 4c 89 f9 mov %r15,%rcx 24: 48 89 df mov %rbx,%rdi 27: 4c 89 f6 mov %r14,%rsi * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 0f 1f 00 nopl (%rax) 2f: 48 89 cb mov %rcx,%rbx 32: 0f 01 ca clac 35: 4c 89 f8 mov %r15,%rax 38: 48 29 c8 sub %rcx,%rax 3b: 48 89 44 24 08 mov %rax,0x8(%rsp)