Hello, The following program triggers VM_BUG_ON_PAGE(PageTail(page)): // autogenerated by syzkaller (http://github.com/google/syzkaller) #include <fcntl.h> #include <numaif.h> #include <sys/mman.h> #include <unistd.h> int main() { int fd; mmap((void*)0x20000000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); fd = open("/dev/sg1", O_RDONLY|O_SYNC|0x100000); mmap((void*)0x20001000, 0x4000, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, fd, 0); mbind((void*)0x20000000, 0x4000, 0x8002, (void*)0x20002ff8, 3660, MPOL_MF_STRICT|MPOL_MF_MOVE); return 0; } page:ffffea0000f5da80 count:0 mapcount:1 mapping:dead000000000400 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000000000() page dumped because: VM_BUG_ON_PAGE(PageTail(page)) ------------[ cut here ]------------ kernel BUG at mm/vmscan.c:1446! invalid opcode: 0000 [#27] SMP DEBUG_PAGEALLOC KASAN Modules linked in: CPU: 1 PID: 8185 Comm: a.out Tainted: G D 4.5.0-rc1+ #300 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88006146c740 ti: ffff88006c8f0000 task.ti: ffff88006c8f0000 RIP: 0010:[<ffffffff8169309a>] [<ffffffff8169309a>] isolate_lru_page+0x4ea/0x6d0 RSP: 0018:ffff88006c8f7a50 EFLAGS: 00010282 RAX: ffff88006146c740 RBX: ffffea0000f5da80 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffea0000f5dab8 RBP: ffff88006c8f7a88 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000002 R11: 1ffffffff134edc5 R12: ffffea0000f5daa0 R13: ffffea0000f5da00 R14: ffffea0000f5da01 R15: 0000000020004000 FS: 00000000022ec880(0063) GS:ffff88003ed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000020003000 CR3: 0000000031d0b000 CR4: 00000000000006e0 Stack: 00000001ffffffff ffffffff816e4159 ffff8800310f6018 0000000020003000 dffffc0000000000 ffffea0000f5da80 0000000020004000 ffff88006c8f7b10 ffffffff8174efdd ffffea0000000001 ffff88006c8f7c70 ffff88006c8f7de8 Call Trace: [< inline >] migrate_page_add mm/mempolicy.c:966 [<ffffffff8174efdd>] queue_pages_pte_range+0x4ad/0x10b0 mm/mempolicy.c:552 [< inline >] walk_pmd_range mm/pagewalk.c:50 [< inline >] walk_pud_range mm/pagewalk.c:90 [< inline >] walk_pgd_range mm/pagewalk.c:116 [<ffffffff817209c3>] __walk_page_range+0x653/0xcd0 mm/pagewalk.c:204 [<ffffffff81721174>] walk_page_range+0x134/0x300 mm/pagewalk.c:281 [<ffffffff8174cd9b>] queue_pages_range+0xfb/0x130 mm/mempolicy.c:687 [<ffffffff817555e1>] do_mbind+0x2c1/0xdc0 mm/mempolicy.c:1239 [< inline >] SYSC_mbind mm/mempolicy.c:1351 [<ffffffff8175643d>] SyS_mbind+0x13d/0x150 mm/mempolicy.c:1333 [<ffffffff86653236>] entry_SYSCALL_64_fastpath+0x16/0x7a arch/x86/entry/entry_64.S:185 Code: 89 df e8 5a 62 04 00 0f 0b e8 43 71 ed ff 4d 8d 6e ff e9 73 fb ff ff e8 35 71 ed ff 48 c7 c6 a0 ab 79 86 48 89 df e8 36 62 04 00 <0f> 0b e8 1f 71 ed ff 4d 8d 6e ff e9 eb fb ff ff c7 45 d0 f0 ff RIP [<ffffffff8169309a>] isolate_lru_page+0x4ea/0x6d0 mm/vmscan.c:1446 RSP <ffff88006c8f7a50> ---[ end trace 4b07319c03942d44 ]--- BUG: sleeping function called from invalid context at include/linux/sched.h:2805 in_atomic(): 1, irqs_disabled(): 0, pid: 8185, name: a.out INFO: lockdep is turned off. CPU: 1 PID: 8185 Comm: a.out Tainted: G D 4.5.0-rc1+ #300 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 00000000ffffffff ffff88006c8f7548 ffffffff82be118d ffff88006146c740 0000000000001ff9 0000000000000000 ffff88006c8f7570 ffffffff813cb8cb ffff88006146c740 ffffffff867387a0 0000000000000af5 ffff88006c8f75b0 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff82be118d>] dump_stack+0x6f/0xa2 lib/dump_stack.c:50 [<ffffffff813cb8cb>] ___might_sleep+0x27b/0x3a0 kernel/sched/core.c:7703 [<ffffffff813cba80>] __might_sleep+0x90/0x1a0 kernel/sched/core.c:7665 [< inline >] threadgroup_change_begin include/linux/sched.h:2805 [<ffffffff813830d1>] exit_signals+0x81/0x430 kernel/signal.c:2392 [<ffffffff8135c3dc>] do_exit+0x23c/0x2cb0 kernel/exit.c:701 [<ffffffff811aa28f>] oops_end+0x9f/0xd0 arch/x86/kernel/dumpstack.c:250 [<ffffffff811aa686>] die+0x46/0x60 arch/x86/kernel/dumpstack.c:316 [< inline >] do_trap_no_signal arch/x86/kernel/traps.c:205 [<ffffffff811a3b9f>] do_trap+0x18f/0x380 arch/x86/kernel/traps.c:251 [<ffffffff811a400e>] do_error_trap+0x11e/0x280 arch/x86/kernel/traps.c:290 [<ffffffff811a527b>] do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:303 [<ffffffff86654f4e>] invalid_op+0x1e/0x30 arch/x86/entry/entry_64.S:830 [< inline >] migrate_page_add mm/mempolicy.c:966 [<ffffffff8174efdd>] queue_pages_pte_range+0x4ad/0x10b0 mm/mempolicy.c:552 [< inline >] walk_pmd_range mm/pagewalk.c:50 [< inline >] walk_pud_range mm/pagewalk.c:90 [< inline >] walk_pgd_range mm/pagewalk.c:116 [<ffffffff817209c3>] __walk_page_range+0x653/0xcd0 mm/pagewalk.c:204 [<ffffffff81721174>] walk_page_range+0x134/0x300 mm/pagewalk.c:281 [<ffffffff8174cd9b>] queue_pages_range+0xfb/0x130 mm/mempolicy.c:687 [<ffffffff817555e1>] do_mbind+0x2c1/0xdc0 mm/mempolicy.c:1239 [< inline >] SYSC_mbind mm/mempolicy.c:1351 [<ffffffff8175643d>] SyS_mbind+0x13d/0x150 mm/mempolicy.c:1333 [<ffffffff86653236>] entry_SYSCALL_64_fastpath+0x16/0x7a arch/x86/entry/entry_64.S:185 note: a.out[8185] exited with preempt_count 1 On commit 92e963f50fc74041b5e9e744c330dca48e04f08d with Kirill recent fix: --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -1261,7 +1261,7 @@ sg_mmap(struct file *filp, struct vm_area_struct *vma) } sfp->mmap_called = 1; - vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; + vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; vma->vm_private_data = sfp; vma->vm_ops = &sg_mmap_vm_ops; return 0; -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
